xfs_inode.c 97.1 KB
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/*
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 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
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 * All Rights Reserved.
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 *
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 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
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 * published by the Free Software Foundation.
 *
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 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
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#include <linux/log2.h>

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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
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#include "xfs_sb.h"
#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_da_format.h"
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#include "xfs_da_btree.h"
#include "xfs_dir2.h"
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#include "xfs_attr_sf.h"
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#include "xfs_attr.h"
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#include "xfs_trans_space.h"
#include "xfs_trans.h"
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#include "xfs_buf_item.h"
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#include "xfs_inode_item.h"
#include "xfs_ialloc.h"
#include "xfs_bmap.h"
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#include "xfs_bmap_util.h"
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#include "xfs_error.h"
#include "xfs_quota.h"
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#include "xfs_filestream.h"
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#include "xfs_cksum.h"
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#include "xfs_trace.h"
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#include "xfs_icache.h"
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#include "xfs_symlink.h"
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#include "xfs_trans_priv.h"
#include "xfs_log.h"
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#include "xfs_bmap_btree.h"
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kmem_zone_t *xfs_inode_zone;

/*
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 * Used in xfs_itruncate_extents().  This is the maximum number of extents
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 * freed from a file in a single transaction.
 */
#define	XFS_ITRUNC_MAX_EXTENTS	2

STATIC int xfs_iflush_int(xfs_inode_t *, xfs_buf_t *);

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STATIC int xfs_iunlink_remove(xfs_trans_t *, xfs_inode_t *);

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/*
 * helper function to extract extent size hint from inode
 */
xfs_extlen_t
xfs_get_extsz_hint(
	struct xfs_inode	*ip)
{
	if ((ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE) && ip->i_d.di_extsize)
		return ip->i_d.di_extsize;
	if (XFS_IS_REALTIME_INODE(ip))
		return ip->i_mount->m_sb.sb_rextsize;
	return 0;
}

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/*
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 * These two are wrapper routines around the xfs_ilock() routine used to
 * centralize some grungy code.  They are used in places that wish to lock the
 * inode solely for reading the extents.  The reason these places can't just
 * call xfs_ilock(ip, XFS_ILOCK_SHARED) is that the inode lock also guards to
 * bringing in of the extents from disk for a file in b-tree format.  If the
 * inode is in b-tree format, then we need to lock the inode exclusively until
 * the extents are read in.  Locking it exclusively all the time would limit
 * our parallelism unnecessarily, though.  What we do instead is check to see
 * if the extents have been read in yet, and only lock the inode exclusively
 * if they have not.
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 *
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 * The functions return a value which should be given to the corresponding
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 * xfs_iunlock() call.
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 */
uint
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xfs_ilock_data_map_shared(
	struct xfs_inode	*ip)
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{
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	uint			lock_mode = XFS_ILOCK_SHARED;
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	if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE &&
	    (ip->i_df.if_flags & XFS_IFEXTENTS) == 0)
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		lock_mode = XFS_ILOCK_EXCL;
	xfs_ilock(ip, lock_mode);
	return lock_mode;
}

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uint
xfs_ilock_attr_map_shared(
	struct xfs_inode	*ip)
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{
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	uint			lock_mode = XFS_ILOCK_SHARED;

	if (ip->i_d.di_aformat == XFS_DINODE_FMT_BTREE &&
	    (ip->i_afp->if_flags & XFS_IFEXTENTS) == 0)
		lock_mode = XFS_ILOCK_EXCL;
	xfs_ilock(ip, lock_mode);
	return lock_mode;
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}

/*
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 * The xfs inode contains 3 multi-reader locks: the i_iolock the i_mmap_lock and
 * the i_lock.  This routine allows various combinations of the locks to be
 * obtained.
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 *
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 * The 3 locks should always be ordered so that the IO lock is obtained first,
 * the mmap lock second and the ilock last in order to prevent deadlock.
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 *
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 * Basic locking order:
 *
 * i_iolock -> i_mmap_lock -> page_lock -> i_ilock
 *
 * mmap_sem locking order:
 *
 * i_iolock -> page lock -> mmap_sem
 * mmap_sem -> i_mmap_lock -> page_lock
 *
 * The difference in mmap_sem locking order mean that we cannot hold the
 * i_mmap_lock over syscall based read(2)/write(2) based IO. These IO paths can
 * fault in pages during copy in/out (for buffered IO) or require the mmap_sem
 * in get_user_pages() to map the user pages into the kernel address space for
 * direct IO. Similarly the i_iolock cannot be taken inside a page fault because
 * page faults already hold the mmap_sem.
 *
 * Hence to serialise fully against both syscall and mmap based IO, we need to
 * take both the i_iolock and the i_mmap_lock. These locks should *only* be both
 * taken in places where we need to invalidate the page cache in a race
 * free manner (e.g. truncate, hole punch and other extent manipulation
 * functions).
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 */
void
xfs_ilock(
	xfs_inode_t		*ip,
	uint			lock_flags)
{
	trace_xfs_ilock(ip, lock_flags, _RET_IP_);

	/*
	 * You can't set both SHARED and EXCL for the same lock,
	 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
	 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
	 */
	ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
	       (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
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	ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
	       (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
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	ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
	       (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
	ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);

	if (lock_flags & XFS_IOLOCK_EXCL)
		mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
	else if (lock_flags & XFS_IOLOCK_SHARED)
		mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));

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	if (lock_flags & XFS_MMAPLOCK_EXCL)
		mrupdate_nested(&ip->i_mmaplock, XFS_MMAPLOCK_DEP(lock_flags));
	else if (lock_flags & XFS_MMAPLOCK_SHARED)
		mraccess_nested(&ip->i_mmaplock, XFS_MMAPLOCK_DEP(lock_flags));

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	if (lock_flags & XFS_ILOCK_EXCL)
		mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
	else if (lock_flags & XFS_ILOCK_SHARED)
		mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
}

/*
 * This is just like xfs_ilock(), except that the caller
 * is guaranteed not to sleep.  It returns 1 if it gets
 * the requested locks and 0 otherwise.  If the IO lock is
 * obtained but the inode lock cannot be, then the IO lock
 * is dropped before returning.
 *
 * ip -- the inode being locked
 * lock_flags -- this parameter indicates the inode's locks to be
 *       to be locked.  See the comment for xfs_ilock() for a list
 *	 of valid values.
 */
int
xfs_ilock_nowait(
	xfs_inode_t		*ip,
	uint			lock_flags)
{
	trace_xfs_ilock_nowait(ip, lock_flags, _RET_IP_);

	/*
	 * You can't set both SHARED and EXCL for the same lock,
	 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
	 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
	 */
	ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
	       (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
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	ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
	       (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
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	ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
	       (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
	ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);

	if (lock_flags & XFS_IOLOCK_EXCL) {
		if (!mrtryupdate(&ip->i_iolock))
			goto out;
	} else if (lock_flags & XFS_IOLOCK_SHARED) {
		if (!mrtryaccess(&ip->i_iolock))
			goto out;
	}
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	if (lock_flags & XFS_MMAPLOCK_EXCL) {
		if (!mrtryupdate(&ip->i_mmaplock))
			goto out_undo_iolock;
	} else if (lock_flags & XFS_MMAPLOCK_SHARED) {
		if (!mrtryaccess(&ip->i_mmaplock))
			goto out_undo_iolock;
	}

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	if (lock_flags & XFS_ILOCK_EXCL) {
		if (!mrtryupdate(&ip->i_lock))
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			goto out_undo_mmaplock;
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	} else if (lock_flags & XFS_ILOCK_SHARED) {
		if (!mrtryaccess(&ip->i_lock))
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			goto out_undo_mmaplock;
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	}
	return 1;

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out_undo_mmaplock:
	if (lock_flags & XFS_MMAPLOCK_EXCL)
		mrunlock_excl(&ip->i_mmaplock);
	else if (lock_flags & XFS_MMAPLOCK_SHARED)
		mrunlock_shared(&ip->i_mmaplock);
out_undo_iolock:
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	if (lock_flags & XFS_IOLOCK_EXCL)
		mrunlock_excl(&ip->i_iolock);
	else if (lock_flags & XFS_IOLOCK_SHARED)
		mrunlock_shared(&ip->i_iolock);
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out:
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	return 0;
}

/*
 * xfs_iunlock() is used to drop the inode locks acquired with
 * xfs_ilock() and xfs_ilock_nowait().  The caller must pass
 * in the flags given to xfs_ilock() or xfs_ilock_nowait() so
 * that we know which locks to drop.
 *
 * ip -- the inode being unlocked
 * lock_flags -- this parameter indicates the inode's locks to be
 *       to be unlocked.  See the comment for xfs_ilock() for a list
 *	 of valid values for this parameter.
 *
 */
void
xfs_iunlock(
	xfs_inode_t		*ip,
	uint			lock_flags)
{
	/*
	 * You can't set both SHARED and EXCL for the same lock,
	 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
	 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
	 */
	ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
	       (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
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	ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
	       (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
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	ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
	       (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
	ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
	ASSERT(lock_flags != 0);

	if (lock_flags & XFS_IOLOCK_EXCL)
		mrunlock_excl(&ip->i_iolock);
	else if (lock_flags & XFS_IOLOCK_SHARED)
		mrunlock_shared(&ip->i_iolock);

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	if (lock_flags & XFS_MMAPLOCK_EXCL)
		mrunlock_excl(&ip->i_mmaplock);
	else if (lock_flags & XFS_MMAPLOCK_SHARED)
		mrunlock_shared(&ip->i_mmaplock);

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	if (lock_flags & XFS_ILOCK_EXCL)
		mrunlock_excl(&ip->i_lock);
	else if (lock_flags & XFS_ILOCK_SHARED)
		mrunlock_shared(&ip->i_lock);

	trace_xfs_iunlock(ip, lock_flags, _RET_IP_);
}

/*
 * give up write locks.  the i/o lock cannot be held nested
 * if it is being demoted.
 */
void
xfs_ilock_demote(
	xfs_inode_t		*ip,
	uint			lock_flags)
{
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	ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_MMAPLOCK_EXCL|XFS_ILOCK_EXCL));
	ASSERT((lock_flags &
		~(XFS_IOLOCK_EXCL|XFS_MMAPLOCK_EXCL|XFS_ILOCK_EXCL)) == 0);
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	if (lock_flags & XFS_ILOCK_EXCL)
		mrdemote(&ip->i_lock);
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	if (lock_flags & XFS_MMAPLOCK_EXCL)
		mrdemote(&ip->i_mmaplock);
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	if (lock_flags & XFS_IOLOCK_EXCL)
		mrdemote(&ip->i_iolock);

	trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_);
}

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#if defined(DEBUG) || defined(XFS_WARN)
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int
xfs_isilocked(
	xfs_inode_t		*ip,
	uint			lock_flags)
{
	if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) {
		if (!(lock_flags & XFS_ILOCK_SHARED))
			return !!ip->i_lock.mr_writer;
		return rwsem_is_locked(&ip->i_lock.mr_lock);
	}

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	if (lock_flags & (XFS_MMAPLOCK_EXCL|XFS_MMAPLOCK_SHARED)) {
		if (!(lock_flags & XFS_MMAPLOCK_SHARED))
			return !!ip->i_mmaplock.mr_writer;
		return rwsem_is_locked(&ip->i_mmaplock.mr_lock);
	}

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	if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) {
		if (!(lock_flags & XFS_IOLOCK_SHARED))
			return !!ip->i_iolock.mr_writer;
		return rwsem_is_locked(&ip->i_iolock.mr_lock);
	}

	ASSERT(0);
	return 0;
}
#endif

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#ifdef DEBUG
int xfs_locked_n;
int xfs_small_retries;
int xfs_middle_retries;
int xfs_lots_retries;
int xfs_lock_delays;
#endif

/*
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 * Bump the subclass so xfs_lock_inodes() acquires each lock with a different
 * value. This shouldn't be called for page fault locking, but we also need to
 * ensure we don't overrun the number of lockdep subclasses for the iolock or
 * mmaplock as that is limited to 12 by the mmap lock lockdep annotations.
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 */
static inline int
xfs_lock_inumorder(int lock_mode, int subclass)
{
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	if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) {
		ASSERT(subclass + XFS_LOCK_INUMORDER <
			(1 << (XFS_MMAPLOCK_SHIFT - XFS_IOLOCK_SHIFT)));
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		lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
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	}

	if (lock_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) {
		ASSERT(subclass + XFS_LOCK_INUMORDER <
			(1 << (XFS_ILOCK_SHIFT - XFS_MMAPLOCK_SHIFT)));
		lock_mode |= (subclass + XFS_LOCK_INUMORDER) <<
							XFS_MMAPLOCK_SHIFT;
	}

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	if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
		lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;

	return lock_mode;
}

/*
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 * The following routine will lock n inodes in exclusive mode.  We assume the
 * caller calls us with the inodes in i_ino order.
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 *
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 * We need to detect deadlock where an inode that we lock is in the AIL and we
 * start waiting for another inode that is locked by a thread in a long running
 * transaction (such as truncate). This can result in deadlock since the long
 * running trans might need to wait for the inode we just locked in order to
 * push the tail and free space in the log.
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 */
void
xfs_lock_inodes(
	xfs_inode_t	**ips,
	int		inodes,
	uint		lock_mode)
{
	int		attempts = 0, i, j, try_lock;
	xfs_log_item_t	*lp;

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	/* currently supports between 2 and 5 inodes */
	ASSERT(ips && inodes >= 2 && inodes <= 5);
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	try_lock = 0;
	i = 0;
again:
	for (; i < inodes; i++) {
		ASSERT(ips[i]);

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		if (i && (ips[i] == ips[i - 1]))	/* Already locked */
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			continue;

		/*
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		 * If try_lock is not set yet, make sure all locked inodes are
		 * not in the AIL.  If any are, set try_lock to be used later.
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		 */
		if (!try_lock) {
			for (j = (i - 1); j >= 0 && !try_lock; j--) {
				lp = (xfs_log_item_t *)ips[j]->i_itemp;
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				if (lp && (lp->li_flags & XFS_LI_IN_AIL))
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					try_lock++;
			}
		}

		/*
		 * If any of the previous locks we have locked is in the AIL,
		 * we must TRY to get the second and subsequent locks. If
		 * we can't get any, we must release all we have
		 * and try again.
		 */
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		if (!try_lock) {
			xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
			continue;
		}

		/* try_lock means we have an inode locked that is in the AIL. */
		ASSERT(i != 0);
		if (xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i)))
			continue;
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		/*
		 * Unlock all previous guys and try again.  xfs_iunlock will try
		 * to push the tail if the inode is in the AIL.
		 */
		attempts++;
		for (j = i - 1; j >= 0; j--) {
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			/*
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			 * Check to see if we've already unlocked this one.  Not
			 * the first one going back, and the inode ptr is the
			 * same.
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			 */
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			if (j != (i - 1) && ips[j] == ips[j + 1])
				continue;
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			xfs_iunlock(ips[j], lock_mode);
		}
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		if ((attempts % 5) == 0) {
			delay(1); /* Don't just spin the CPU */
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#ifdef DEBUG
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			xfs_lock_delays++;
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#endif
		}
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		i = 0;
		try_lock = 0;
		goto again;
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	}

#ifdef DEBUG
	if (attempts) {
		if (attempts < 5) xfs_small_retries++;
		else if (attempts < 100) xfs_middle_retries++;
		else xfs_lots_retries++;
	} else {
		xfs_locked_n++;
	}
#endif
}

/*
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 * xfs_lock_two_inodes() can only be used to lock one type of lock at a time -
 * the iolock, the mmaplock or the ilock, but not more than one at a time. If we
 * lock more than one at a time, lockdep will report false positives saying we
 * have violated locking orders.
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 */
void
xfs_lock_two_inodes(
	xfs_inode_t		*ip0,
	xfs_inode_t		*ip1,
	uint			lock_mode)
{
	xfs_inode_t		*temp;
	int			attempts = 0;
	xfs_log_item_t		*lp;

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	if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) {
		ASSERT(!(lock_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)));
		ASSERT(!(lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));
	} else if (lock_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL))
		ASSERT(!(lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)));

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Dave Chinner 已提交
513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542
	ASSERT(ip0->i_ino != ip1->i_ino);

	if (ip0->i_ino > ip1->i_ino) {
		temp = ip0;
		ip0 = ip1;
		ip1 = temp;
	}

 again:
	xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0));

	/*
	 * If the first lock we have locked is in the AIL, we must TRY to get
	 * the second lock. If we can't get it, we must release the first one
	 * and try again.
	 */
	lp = (xfs_log_item_t *)ip0->i_itemp;
	if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
		if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) {
			xfs_iunlock(ip0, lock_mode);
			if ((++attempts % 5) == 0)
				delay(1); /* Don't just spin the CPU */
			goto again;
		}
	} else {
		xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1));
	}
}


543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558
void
__xfs_iflock(
	struct xfs_inode	*ip)
{
	wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IFLOCK_BIT);
	DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IFLOCK_BIT);

	do {
		prepare_to_wait_exclusive(wq, &wait.wait, TASK_UNINTERRUPTIBLE);
		if (xfs_isiflocked(ip))
			io_schedule();
	} while (!xfs_iflock_nowait(ip));

	finish_wait(wq, &wait.wait);
}

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STATIC uint
_xfs_dic2xflags(
	__uint16_t		di_flags)
{
	uint			flags = 0;

	if (di_flags & XFS_DIFLAG_ANY) {
		if (di_flags & XFS_DIFLAG_REALTIME)
			flags |= XFS_XFLAG_REALTIME;
		if (di_flags & XFS_DIFLAG_PREALLOC)
			flags |= XFS_XFLAG_PREALLOC;
		if (di_flags & XFS_DIFLAG_IMMUTABLE)
			flags |= XFS_XFLAG_IMMUTABLE;
		if (di_flags & XFS_DIFLAG_APPEND)
			flags |= XFS_XFLAG_APPEND;
		if (di_flags & XFS_DIFLAG_SYNC)
			flags |= XFS_XFLAG_SYNC;
		if (di_flags & XFS_DIFLAG_NOATIME)
			flags |= XFS_XFLAG_NOATIME;
		if (di_flags & XFS_DIFLAG_NODUMP)
			flags |= XFS_XFLAG_NODUMP;
		if (di_flags & XFS_DIFLAG_RTINHERIT)
			flags |= XFS_XFLAG_RTINHERIT;
		if (di_flags & XFS_DIFLAG_PROJINHERIT)
			flags |= XFS_XFLAG_PROJINHERIT;
		if (di_flags & XFS_DIFLAG_NOSYMLINKS)
			flags |= XFS_XFLAG_NOSYMLINKS;
586 587 588 589
		if (di_flags & XFS_DIFLAG_EXTSIZE)
			flags |= XFS_XFLAG_EXTSIZE;
		if (di_flags & XFS_DIFLAG_EXTSZINHERIT)
			flags |= XFS_XFLAG_EXTSZINHERIT;
590 591
		if (di_flags & XFS_DIFLAG_NODEFRAG)
			flags |= XFS_XFLAG_NODEFRAG;
592 593
		if (di_flags & XFS_DIFLAG_FILESTREAM)
			flags |= XFS_XFLAG_FILESTREAM;
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	}

	return flags;
}

uint
xfs_ip2xflags(
	xfs_inode_t		*ip)
{
603
	xfs_icdinode_t		*dic = &ip->i_d;
L
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605
	return _xfs_dic2xflags(dic->di_flags) |
606
				(XFS_IFORK_Q(ip) ? XFS_XFLAG_HASATTR : 0);
L
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}

uint
xfs_dic2xflags(
611
	xfs_dinode_t		*dip)
L
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{
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Christoph Hellwig 已提交
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	return _xfs_dic2xflags(be16_to_cpu(dip->di_flags)) |
614
				(XFS_DFORK_Q(dip) ? XFS_XFLAG_HASATTR : 0);
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}

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/*
 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
 * is allowed, otherwise it has to be an exact match. If a CI match is found,
 * ci_name->name will point to a the actual name (caller must free) or
 * will be set to NULL if an exact match is found.
 */
int
xfs_lookup(
	xfs_inode_t		*dp,
	struct xfs_name		*name,
	xfs_inode_t		**ipp,
	struct xfs_name		*ci_name)
{
	xfs_ino_t		inum;
	int			error;
	uint			lock_mode;

	trace_xfs_lookup(dp, name);

	if (XFS_FORCED_SHUTDOWN(dp->i_mount))
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		return -EIO;
D
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638

639
	lock_mode = xfs_ilock_data_map_shared(dp);
D
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640
	error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
641
	xfs_iunlock(dp, lock_mode);
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	if (error)
		goto out;

	error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp);
	if (error)
		goto out_free_name;

	return 0;

out_free_name:
	if (ci_name)
		kmem_free(ci_name->name);
out:
	*ipp = NULL;
	return error;
}

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/*
 * Allocate an inode on disk and return a copy of its in-core version.
 * The in-core inode is locked exclusively.  Set mode, nlink, and rdev
 * appropriately within the inode.  The uid and gid for the inode are
 * set according to the contents of the given cred structure.
 *
 * Use xfs_dialloc() to allocate the on-disk inode. If xfs_dialloc()
C
Carlos Maiolino 已提交
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 * has a free inode available, call xfs_iget() to obtain the in-core
 * version of the allocated inode.  Finally, fill in the inode and
 * log its initial contents.  In this case, ialloc_context would be
 * set to NULL.
L
Linus Torvalds 已提交
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 *
C
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 * If xfs_dialloc() does not have an available inode, it will replenish
 * its supply by doing an allocation. Since we can only do one
 * allocation within a transaction without deadlocks, we must commit
 * the current transaction before returning the inode itself.
 * In this case, therefore, we will set ialloc_context and return.
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 * The caller should then commit the current transaction, start a new
 * transaction, and call xfs_ialloc() again to actually get the inode.
 *
 * To ensure that some other process does not grab the inode that
 * was allocated during the first call to xfs_ialloc(), this routine
 * also returns the [locked] bp pointing to the head of the freelist
 * as ialloc_context.  The caller should hold this buffer across
 * the commit and pass it back into this routine on the second call.
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 *
 * If we are allocating quota inodes, we do not have a parent inode
 * to attach to or associate with (i.e. pip == NULL) because they
 * are not linked into the directory structure - they are attached
 * directly to the superblock - and so have no parent.
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 */
int
xfs_ialloc(
	xfs_trans_t	*tp,
	xfs_inode_t	*pip,
A
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695
	umode_t		mode,
696
	xfs_nlink_t	nlink,
L
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	xfs_dev_t	rdev,
698
	prid_t		prid,
L
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	int		okalloc,
	xfs_buf_t	**ialloc_context,
	xfs_inode_t	**ipp)
{
703
	struct xfs_mount *mp = tp->t_mountp;
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	xfs_ino_t	ino;
	xfs_inode_t	*ip;
	uint		flags;
	int		error;
D
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708
	struct timespec	tv;
L
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	/*
	 * Call the space management code to pick
	 * the on-disk inode to be allocated.
	 */
D
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	error = xfs_dialloc(tp, pip ? pip->i_ino : 0, mode, okalloc,
715
			    ialloc_context, &ino);
716
	if (error)
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		return error;
718
	if (*ialloc_context || ino == NULLFSINO) {
L
Linus Torvalds 已提交
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		*ipp = NULL;
		return 0;
	}
	ASSERT(*ialloc_context == NULL);

	/*
	 * Get the in-core inode with the lock held exclusively.
	 * This is because we're setting fields here we need
	 * to prevent others from looking at until we're done.
	 */
729
	error = xfs_iget(mp, tp, ino, XFS_IGET_CREATE,
730
			 XFS_ILOCK_EXCL, &ip);
731
	if (error)
L
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		return error;
	ASSERT(ip != NULL);

735 736 737 738 739 740 741 742
	/*
	 * We always convert v1 inodes to v2 now - we only support filesystems
	 * with >= v2 inode capability, so there is no reason for ever leaving
	 * an inode in v1 format.
	 */
	if (ip->i_d.di_version == 1)
		ip->i_d.di_version = 2;

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	ip->i_d.di_mode = mode;
L
Linus Torvalds 已提交
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	ip->i_d.di_onlink = 0;
	ip->i_d.di_nlink = nlink;
	ASSERT(ip->i_d.di_nlink == nlink);
747 748
	ip->i_d.di_uid = xfs_kuid_to_uid(current_fsuid());
	ip->i_d.di_gid = xfs_kgid_to_gid(current_fsgid());
749
	xfs_set_projid(ip, prid);
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	memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));

752
	if (pip && XFS_INHERIT_GID(pip)) {
L
Linus Torvalds 已提交
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		ip->i_d.di_gid = pip->i_d.di_gid;
754
		if ((pip->i_d.di_mode & S_ISGID) && S_ISDIR(mode)) {
L
Linus Torvalds 已提交
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			ip->i_d.di_mode |= S_ISGID;
		}
	}

	/*
	 * If the group ID of the new file does not match the effective group
	 * ID or one of the supplementary group IDs, the S_ISGID bit is cleared
	 * (and only if the irix_sgid_inherit compatibility variable is set).
	 */
	if ((irix_sgid_inherit) &&
	    (ip->i_d.di_mode & S_ISGID) &&
766
	    (!in_group_p(xfs_gid_to_kgid(ip->i_d.di_gid)))) {
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		ip->i_d.di_mode &= ~S_ISGID;
	}

	ip->i_d.di_size = 0;
	ip->i_d.di_nextents = 0;
	ASSERT(ip->i_d.di_nblocks == 0);
773

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	tv = current_fs_time(mp->m_super);
775 776 777 778 779
	ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec;
	ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec;
	ip->i_d.di_atime = ip->i_d.di_mtime;
	ip->i_d.di_ctime = ip->i_d.di_mtime;

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Linus Torvalds 已提交
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	/*
	 * di_gen will have been taken care of in xfs_iread.
	 */
	ip->i_d.di_extsize = 0;
	ip->i_d.di_dmevmask = 0;
	ip->i_d.di_dmstate = 0;
	ip->i_d.di_flags = 0;
787 788 789 790 791 792 793 794 795 796 797 798 799

	if (ip->i_d.di_version == 3) {
		ASSERT(ip->i_d.di_ino == ino);
		ASSERT(uuid_equal(&ip->i_d.di_uuid, &mp->m_sb.sb_uuid));
		ip->i_d.di_crc = 0;
		ip->i_d.di_changecount = 1;
		ip->i_d.di_lsn = 0;
		ip->i_d.di_flags2 = 0;
		memset(&(ip->i_d.di_pad2[0]), 0, sizeof(ip->i_d.di_pad2));
		ip->i_d.di_crtime = ip->i_d.di_mtime;
	}


L
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	flags = XFS_ILOG_CORE;
	switch (mode & S_IFMT) {
	case S_IFIFO:
	case S_IFCHR:
	case S_IFBLK:
	case S_IFSOCK:
		ip->i_d.di_format = XFS_DINODE_FMT_DEV;
		ip->i_df.if_u2.if_rdev = rdev;
		ip->i_df.if_flags = 0;
		flags |= XFS_ILOG_DEV;
		break;
	case S_IFREG:
	case S_IFDIR:
D
David Chinner 已提交
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		if (pip && (pip->i_d.di_flags & XFS_DIFLAG_ANY)) {
814 815
			uint	di_flags = 0;

816
			if (S_ISDIR(mode)) {
817 818
				if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
					di_flags |= XFS_DIFLAG_RTINHERIT;
819 820 821 822
				if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
					di_flags |= XFS_DIFLAG_EXTSZINHERIT;
					ip->i_d.di_extsize = pip->i_d.di_extsize;
				}
823 824
				if (pip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
					di_flags |= XFS_DIFLAG_PROJINHERIT;
825
			} else if (S_ISREG(mode)) {
C
Christoph Hellwig 已提交
826
				if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
827
					di_flags |= XFS_DIFLAG_REALTIME;
828 829 830 831
				if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
					di_flags |= XFS_DIFLAG_EXTSIZE;
					ip->i_d.di_extsize = pip->i_d.di_extsize;
				}
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			}
			if ((pip->i_d.di_flags & XFS_DIFLAG_NOATIME) &&
			    xfs_inherit_noatime)
835
				di_flags |= XFS_DIFLAG_NOATIME;
L
Linus Torvalds 已提交
836 837
			if ((pip->i_d.di_flags & XFS_DIFLAG_NODUMP) &&
			    xfs_inherit_nodump)
838
				di_flags |= XFS_DIFLAG_NODUMP;
L
Linus Torvalds 已提交
839 840
			if ((pip->i_d.di_flags & XFS_DIFLAG_SYNC) &&
			    xfs_inherit_sync)
841
				di_flags |= XFS_DIFLAG_SYNC;
L
Linus Torvalds 已提交
842 843
			if ((pip->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) &&
			    xfs_inherit_nosymlinks)
844
				di_flags |= XFS_DIFLAG_NOSYMLINKS;
845 846 847
			if ((pip->i_d.di_flags & XFS_DIFLAG_NODEFRAG) &&
			    xfs_inherit_nodefrag)
				di_flags |= XFS_DIFLAG_NODEFRAG;
848 849
			if (pip->i_d.di_flags & XFS_DIFLAG_FILESTREAM)
				di_flags |= XFS_DIFLAG_FILESTREAM;
850
			ip->i_d.di_flags |= di_flags;
L
Linus Torvalds 已提交
851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870
		}
		/* FALLTHROUGH */
	case S_IFLNK:
		ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS;
		ip->i_df.if_flags = XFS_IFEXTENTS;
		ip->i_df.if_bytes = ip->i_df.if_real_bytes = 0;
		ip->i_df.if_u1.if_extents = NULL;
		break;
	default:
		ASSERT(0);
	}
	/*
	 * Attribute fork settings for new inode.
	 */
	ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
	ip->i_d.di_anextents = 0;

	/*
	 * Log the new values stuffed into the inode.
	 */
871
	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
L
Linus Torvalds 已提交
872 873
	xfs_trans_log_inode(tp, ip, flags);

874
	/* now that we have an i_mode we can setup the inode structure */
875
	xfs_setup_inode(ip);
L
Linus Torvalds 已提交
876 877 878 879 880

	*ipp = ip;
	return 0;
}

D
Dave Chinner 已提交
881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946
/*
 * Allocates a new inode from disk and return a pointer to the
 * incore copy. This routine will internally commit the current
 * transaction and allocate a new one if the Space Manager needed
 * to do an allocation to replenish the inode free-list.
 *
 * This routine is designed to be called from xfs_create and
 * xfs_create_dir.
 *
 */
int
xfs_dir_ialloc(
	xfs_trans_t	**tpp,		/* input: current transaction;
					   output: may be a new transaction. */
	xfs_inode_t	*dp,		/* directory within whose allocate
					   the inode. */
	umode_t		mode,
	xfs_nlink_t	nlink,
	xfs_dev_t	rdev,
	prid_t		prid,		/* project id */
	int		okalloc,	/* ok to allocate new space */
	xfs_inode_t	**ipp,		/* pointer to inode; it will be
					   locked. */
	int		*committed)

{
	xfs_trans_t	*tp;
	xfs_trans_t	*ntp;
	xfs_inode_t	*ip;
	xfs_buf_t	*ialloc_context = NULL;
	int		code;
	void		*dqinfo;
	uint		tflags;

	tp = *tpp;
	ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);

	/*
	 * xfs_ialloc will return a pointer to an incore inode if
	 * the Space Manager has an available inode on the free
	 * list. Otherwise, it will do an allocation and replenish
	 * the freelist.  Since we can only do one allocation per
	 * transaction without deadlocks, we will need to commit the
	 * current transaction and start a new one.  We will then
	 * need to call xfs_ialloc again to get the inode.
	 *
	 * If xfs_ialloc did an allocation to replenish the freelist,
	 * it returns the bp containing the head of the freelist as
	 * ialloc_context. We will hold a lock on it across the
	 * transaction commit so that no other process can steal
	 * the inode(s) that we've just allocated.
	 */
	code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid, okalloc,
			  &ialloc_context, &ip);

	/*
	 * Return an error if we were unable to allocate a new inode.
	 * This should only happen if we run out of space on disk or
	 * encounter a disk error.
	 */
	if (code) {
		*ipp = NULL;
		return code;
	}
	if (!ialloc_context && !ip) {
		*ipp = NULL;
D
Dave Chinner 已提交
947
		return -ENOSPC;
D
Dave Chinner 已提交
948 949 950 951 952 953 954 955 956
	}

	/*
	 * If the AGI buffer is non-NULL, then we were unable to get an
	 * inode in one operation.  We need to commit the current
	 * transaction and call xfs_ialloc() again.  It is guaranteed
	 * to succeed the second time.
	 */
	if (ialloc_context) {
957 958
		struct xfs_trans_res tres;

D
Dave Chinner 已提交
959 960 961 962 963 964 965 966 967 968 969 970
		/*
		 * Normally, xfs_trans_commit releases all the locks.
		 * We call bhold to hang on to the ialloc_context across
		 * the commit.  Holding this buffer prevents any other
		 * processes from doing any allocations in this
		 * allocation group.
		 */
		xfs_trans_bhold(tp, ialloc_context);
		/*
		 * Save the log reservation so we can use
		 * them in the next transaction.
		 */
971 972
		tres.tr_logres = xfs_trans_get_log_res(tp);
		tres.tr_logcount = xfs_trans_get_log_count(tp);
D
Dave Chinner 已提交
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		/*
		 * We want the quota changes to be associated with the next
		 * transaction, NOT this one. So, detach the dqinfo from this
		 * and attach it to the next transaction.
		 */
		dqinfo = NULL;
		tflags = 0;
		if (tp->t_dqinfo) {
			dqinfo = (void *)tp->t_dqinfo;
			tp->t_dqinfo = NULL;
			tflags = tp->t_flags & XFS_TRANS_DQ_DIRTY;
			tp->t_flags &= ~(XFS_TRANS_DQ_DIRTY);
		}

		ntp = xfs_trans_dup(tp);
		code = xfs_trans_commit(tp, 0);
		tp = ntp;
		if (committed != NULL) {
			*committed = 1;
		}
		/*
		 * If we get an error during the commit processing,
		 * release the buffer that is still held and return
		 * to the caller.
		 */
		if (code) {
			xfs_buf_relse(ialloc_context);
			if (dqinfo) {
				tp->t_dqinfo = dqinfo;
				xfs_trans_free_dqinfo(tp);
			}
			*tpp = ntp;
			*ipp = NULL;
			return code;
		}

		/*
		 * transaction commit worked ok so we can drop the extra ticket
		 * reference that we gained in xfs_trans_dup()
		 */
		xfs_log_ticket_put(tp->t_ticket);
1015 1016 1017
		tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
		code = xfs_trans_reserve(tp, &tres, 0, 0);

D
Dave Chinner 已提交
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105
		/*
		 * Re-attach the quota info that we detached from prev trx.
		 */
		if (dqinfo) {
			tp->t_dqinfo = dqinfo;
			tp->t_flags |= tflags;
		}

		if (code) {
			xfs_buf_relse(ialloc_context);
			*tpp = ntp;
			*ipp = NULL;
			return code;
		}
		xfs_trans_bjoin(tp, ialloc_context);

		/*
		 * Call ialloc again. Since we've locked out all
		 * other allocations in this allocation group,
		 * this call should always succeed.
		 */
		code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid,
				  okalloc, &ialloc_context, &ip);

		/*
		 * If we get an error at this point, return to the caller
		 * so that the current transaction can be aborted.
		 */
		if (code) {
			*tpp = tp;
			*ipp = NULL;
			return code;
		}
		ASSERT(!ialloc_context && ip);

	} else {
		if (committed != NULL)
			*committed = 0;
	}

	*ipp = ip;
	*tpp = tp;

	return 0;
}

/*
 * Decrement the link count on an inode & log the change.
 * If this causes the link count to go to zero, initiate the
 * logging activity required to truncate a file.
 */
int				/* error */
xfs_droplink(
	xfs_trans_t *tp,
	xfs_inode_t *ip)
{
	int	error;

	xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);

	ASSERT (ip->i_d.di_nlink > 0);
	ip->i_d.di_nlink--;
	drop_nlink(VFS_I(ip));
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

	error = 0;
	if (ip->i_d.di_nlink == 0) {
		/*
		 * We're dropping the last link to this file.
		 * Move the on-disk inode to the AGI unlinked list.
		 * From xfs_inactive() we will pull the inode from
		 * the list and free it.
		 */
		error = xfs_iunlink(tp, ip);
	}
	return error;
}

/*
 * Increment the link count on an inode & log the change.
 */
int
xfs_bumplink(
	xfs_trans_t *tp,
	xfs_inode_t *ip)
{
	xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);

1106
	ASSERT(ip->i_d.di_version > 1);
1107
	ASSERT(ip->i_d.di_nlink > 0 || (VFS_I(ip)->i_state & I_LINKABLE));
D
Dave Chinner 已提交
1108 1109 1110 1111 1112 1113
	ip->i_d.di_nlink++;
	inc_nlink(VFS_I(ip));
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
	return 0;
}

D
Dave Chinner 已提交
1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135
int
xfs_create(
	xfs_inode_t		*dp,
	struct xfs_name		*name,
	umode_t			mode,
	xfs_dev_t		rdev,
	xfs_inode_t		**ipp)
{
	int			is_dir = S_ISDIR(mode);
	struct xfs_mount	*mp = dp->i_mount;
	struct xfs_inode	*ip = NULL;
	struct xfs_trans	*tp = NULL;
	int			error;
	xfs_bmap_free_t		free_list;
	xfs_fsblock_t		first_block;
	bool                    unlock_dp_on_error = false;
	uint			cancel_flags;
	int			committed;
	prid_t			prid;
	struct xfs_dquot	*udqp = NULL;
	struct xfs_dquot	*gdqp = NULL;
	struct xfs_dquot	*pdqp = NULL;
1136
	struct xfs_trans_res	*tres;
D
Dave Chinner 已提交
1137 1138 1139 1140 1141
	uint			resblks;

	trace_xfs_create(dp, name);

	if (XFS_FORCED_SHUTDOWN(mp))
D
Dave Chinner 已提交
1142
		return -EIO;
D
Dave Chinner 已提交
1143

1144
	prid = xfs_get_initial_prid(dp);
D
Dave Chinner 已提交
1145 1146 1147 1148

	/*
	 * Make sure that we have allocated dquot(s) on disk.
	 */
1149 1150
	error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()),
					xfs_kgid_to_gid(current_fsgid()), prid,
D
Dave Chinner 已提交
1151 1152 1153 1154 1155 1156 1157 1158
					XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
					&udqp, &gdqp, &pdqp);
	if (error)
		return error;

	if (is_dir) {
		rdev = 0;
		resblks = XFS_MKDIR_SPACE_RES(mp, name->len);
1159
		tres = &M_RES(mp)->tr_mkdir;
D
Dave Chinner 已提交
1160 1161 1162
		tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR);
	} else {
		resblks = XFS_CREATE_SPACE_RES(mp, name->len);
1163
		tres = &M_RES(mp)->tr_create;
D
Dave Chinner 已提交
1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
		tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE);
	}

	cancel_flags = XFS_TRANS_RELEASE_LOG_RES;

	/*
	 * Initially assume that the file does not exist and
	 * reserve the resources for that case.  If that is not
	 * the case we'll drop the one we have and get a more
	 * appropriate transaction later.
	 */
1175
	error = xfs_trans_reserve(tp, tres, resblks, 0);
D
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1176
	if (error == -ENOSPC) {
D
Dave Chinner 已提交
1177 1178
		/* flush outstanding delalloc blocks and retry */
		xfs_flush_inodes(mp);
1179
		error = xfs_trans_reserve(tp, tres, resblks, 0);
D
Dave Chinner 已提交
1180
	}
D
Dave Chinner 已提交
1181
	if (error == -ENOSPC) {
D
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1182 1183
		/* No space at all so try a "no-allocation" reservation */
		resblks = 0;
1184
		error = xfs_trans_reserve(tp, tres, 0, 0);
D
Dave Chinner 已提交
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203
	}
	if (error) {
		cancel_flags = 0;
		goto out_trans_cancel;
	}

	xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
	unlock_dp_on_error = true;

	xfs_bmap_init(&free_list, &first_block);

	/*
	 * Reserve disk quota and the inode.
	 */
	error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
						pdqp, resblks, 1, 0);
	if (error)
		goto out_trans_cancel;

1204 1205 1206 1207 1208
	if (!resblks) {
		error = xfs_dir_canenter(tp, dp, name);
		if (error)
			goto out_trans_cancel;
	}
D
Dave Chinner 已提交
1209 1210 1211 1212 1213 1214 1215 1216 1217

	/*
	 * A newly created regular or special file just has one directory
	 * entry pointing to them, but a directory also the "." entry
	 * pointing to itself.
	 */
	error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev,
			       prid, resblks > 0, &ip, &committed);
	if (error) {
D
Dave Chinner 已提交
1218
		if (error == -ENOSPC)
D
Dave Chinner 已提交
1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236
			goto out_trans_cancel;
		goto out_trans_abort;
	}

	/*
	 * Now we join the directory inode to the transaction.  We do not do it
	 * earlier because xfs_dir_ialloc might commit the previous transaction
	 * (and release all the locks).  An error from here on will result in
	 * the transaction cancel unlocking dp so don't do it explicitly in the
	 * error path.
	 */
	xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
	unlock_dp_on_error = false;

	error = xfs_dir_createname(tp, dp, name, ip->i_ino,
					&first_block, &free_list, resblks ?
					resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
	if (error) {
D
Dave Chinner 已提交
1237
		ASSERT(error != -ENOSPC);
D
Dave Chinner 已提交
1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290
		goto out_trans_abort;
	}
	xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
	xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);

	if (is_dir) {
		error = xfs_dir_init(tp, ip, dp);
		if (error)
			goto out_bmap_cancel;

		error = xfs_bumplink(tp, dp);
		if (error)
			goto out_bmap_cancel;
	}

	/*
	 * If this is a synchronous mount, make sure that the
	 * create transaction goes to disk before returning to
	 * the user.
	 */
	if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
		xfs_trans_set_sync(tp);

	/*
	 * Attach the dquot(s) to the inodes and modify them incore.
	 * These ids of the inode couldn't have changed since the new
	 * inode has been locked ever since it was created.
	 */
	xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);

	error = xfs_bmap_finish(&tp, &free_list, &committed);
	if (error)
		goto out_bmap_cancel;

	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
	if (error)
		goto out_release_inode;

	xfs_qm_dqrele(udqp);
	xfs_qm_dqrele(gdqp);
	xfs_qm_dqrele(pdqp);

	*ipp = ip;
	return 0;

 out_bmap_cancel:
	xfs_bmap_cancel(&free_list);
 out_trans_abort:
	cancel_flags |= XFS_TRANS_ABORT;
 out_trans_cancel:
	xfs_trans_cancel(tp, cancel_flags);
 out_release_inode:
	/*
1291 1292 1293
	 * Wait until after the current transaction is aborted to finish the
	 * setup of the inode and release the inode.  This prevents recursive
	 * transactions and deadlocks from xfs_inactive.
D
Dave Chinner 已提交
1294
	 */
1295 1296
	if (ip) {
		xfs_finish_inode_setup(ip);
D
Dave Chinner 已提交
1297
		IRELE(ip);
1298
	}
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1299 1300 1301 1302 1303 1304 1305 1306 1307 1308

	xfs_qm_dqrele(udqp);
	xfs_qm_dqrele(gdqp);
	xfs_qm_dqrele(pdqp);

	if (unlock_dp_on_error)
		xfs_iunlock(dp, XFS_ILOCK_EXCL);
	return error;
}

Z
Zhi Yong Wu 已提交
1309 1310 1311 1312
int
xfs_create_tmpfile(
	struct xfs_inode	*dp,
	struct dentry		*dentry,
1313 1314
	umode_t			mode,
	struct xfs_inode	**ipp)
Z
Zhi Yong Wu 已提交
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328
{
	struct xfs_mount	*mp = dp->i_mount;
	struct xfs_inode	*ip = NULL;
	struct xfs_trans	*tp = NULL;
	int			error;
	uint			cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
	prid_t                  prid;
	struct xfs_dquot	*udqp = NULL;
	struct xfs_dquot	*gdqp = NULL;
	struct xfs_dquot	*pdqp = NULL;
	struct xfs_trans_res	*tres;
	uint			resblks;

	if (XFS_FORCED_SHUTDOWN(mp))
D
Dave Chinner 已提交
1329
		return -EIO;
Z
Zhi Yong Wu 已提交
1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347

	prid = xfs_get_initial_prid(dp);

	/*
	 * Make sure that we have allocated dquot(s) on disk.
	 */
	error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()),
				xfs_kgid_to_gid(current_fsgid()), prid,
				XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
				&udqp, &gdqp, &pdqp);
	if (error)
		return error;

	resblks = XFS_IALLOC_SPACE_RES(mp);
	tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE_TMPFILE);

	tres = &M_RES(mp)->tr_create_tmpfile;
	error = xfs_trans_reserve(tp, tres, resblks, 0);
D
Dave Chinner 已提交
1348
	if (error == -ENOSPC) {
Z
Zhi Yong Wu 已提交
1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365
		/* No space at all so try a "no-allocation" reservation */
		resblks = 0;
		error = xfs_trans_reserve(tp, tres, 0, 0);
	}
	if (error) {
		cancel_flags = 0;
		goto out_trans_cancel;
	}

	error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
						pdqp, resblks, 1, 0);
	if (error)
		goto out_trans_cancel;

	error = xfs_dir_ialloc(&tp, dp, mode, 1, 0,
				prid, resblks > 0, &ip, NULL);
	if (error) {
D
Dave Chinner 已提交
1366
		if (error == -ENOSPC)
Z
Zhi Yong Wu 已提交
1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393
			goto out_trans_cancel;
		goto out_trans_abort;
	}

	if (mp->m_flags & XFS_MOUNT_WSYNC)
		xfs_trans_set_sync(tp);

	/*
	 * Attach the dquot(s) to the inodes and modify them incore.
	 * These ids of the inode couldn't have changed since the new
	 * inode has been locked ever since it was created.
	 */
	xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);

	ip->i_d.di_nlink--;
	error = xfs_iunlink(tp, ip);
	if (error)
		goto out_trans_abort;

	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
	if (error)
		goto out_release_inode;

	xfs_qm_dqrele(udqp);
	xfs_qm_dqrele(gdqp);
	xfs_qm_dqrele(pdqp);

1394
	*ipp = ip;
Z
Zhi Yong Wu 已提交
1395 1396 1397 1398 1399 1400 1401 1402
	return 0;

 out_trans_abort:
	cancel_flags |= XFS_TRANS_ABORT;
 out_trans_cancel:
	xfs_trans_cancel(tp, cancel_flags);
 out_release_inode:
	/*
1403 1404 1405
	 * Wait until after the current transaction is aborted to finish the
	 * setup of the inode and release the inode.  This prevents recursive
	 * transactions and deadlocks from xfs_inactive.
Z
Zhi Yong Wu 已提交
1406
	 */
1407 1408
	if (ip) {
		xfs_finish_inode_setup(ip);
Z
Zhi Yong Wu 已提交
1409
		IRELE(ip);
1410
	}
Z
Zhi Yong Wu 已提交
1411 1412 1413 1414 1415 1416 1417 1418

	xfs_qm_dqrele(udqp);
	xfs_qm_dqrele(gdqp);
	xfs_qm_dqrele(pdqp);

	return error;
}

D
Dave Chinner 已提交
1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438
int
xfs_link(
	xfs_inode_t		*tdp,
	xfs_inode_t		*sip,
	struct xfs_name		*target_name)
{
	xfs_mount_t		*mp = tdp->i_mount;
	xfs_trans_t		*tp;
	int			error;
	xfs_bmap_free_t         free_list;
	xfs_fsblock_t           first_block;
	int			cancel_flags;
	int			committed;
	int			resblks;

	trace_xfs_link(tdp, target_name);

	ASSERT(!S_ISDIR(sip->i_d.di_mode));

	if (XFS_FORCED_SHUTDOWN(mp))
D
Dave Chinner 已提交
1439
		return -EIO;
D
Dave Chinner 已提交
1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451

	error = xfs_qm_dqattach(sip, 0);
	if (error)
		goto std_return;

	error = xfs_qm_dqattach(tdp, 0);
	if (error)
		goto std_return;

	tp = xfs_trans_alloc(mp, XFS_TRANS_LINK);
	cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
	resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
1452
	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_link, resblks, 0);
D
Dave Chinner 已提交
1453
	if (error == -ENOSPC) {
D
Dave Chinner 已提交
1454
		resblks = 0;
1455
		error = xfs_trans_reserve(tp, &M_RES(mp)->tr_link, 0, 0);
D
Dave Chinner 已提交
1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473
	}
	if (error) {
		cancel_flags = 0;
		goto error_return;
	}

	xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL);

	xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
	xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);

	/*
	 * If we are using project inheritance, we only allow hard link
	 * creation in our tree when the project IDs are the same; else
	 * the tree quota mechanism could be circumvented.
	 */
	if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
		     (xfs_get_projid(tdp) != xfs_get_projid(sip)))) {
D
Dave Chinner 已提交
1474
		error = -EXDEV;
D
Dave Chinner 已提交
1475 1476 1477
		goto error_return;
	}

1478 1479 1480 1481 1482
	if (!resblks) {
		error = xfs_dir_canenter(tp, tdp, target_name);
		if (error)
			goto error_return;
	}
D
Dave Chinner 已提交
1483 1484 1485

	xfs_bmap_init(&free_list, &first_block);

1486 1487 1488 1489 1490 1491
	if (sip->i_d.di_nlink == 0) {
		error = xfs_iunlink_remove(tp, sip);
		if (error)
			goto abort_return;
	}

D
Dave Chinner 已提交
1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527
	error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
					&first_block, &free_list, resblks);
	if (error)
		goto abort_return;
	xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
	xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);

	error = xfs_bumplink(tp, sip);
	if (error)
		goto abort_return;

	/*
	 * If this is a synchronous mount, make sure that the
	 * link transaction goes to disk before returning to
	 * the user.
	 */
	if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
		xfs_trans_set_sync(tp);
	}

	error = xfs_bmap_finish (&tp, &free_list, &committed);
	if (error) {
		xfs_bmap_cancel(&free_list);
		goto abort_return;
	}

	return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);

 abort_return:
	cancel_flags |= XFS_TRANS_ABORT;
 error_return:
	xfs_trans_cancel(tp, cancel_flags);
 std_return:
	return error;
}

L
Linus Torvalds 已提交
1528
/*
1529 1530 1531
 * Free up the underlying blocks past new_size.  The new size must be smaller
 * than the current size.  This routine can be used both for the attribute and
 * data fork, and does not modify the inode size, which is left to the caller.
L
Linus Torvalds 已提交
1532
 *
1533 1534 1535 1536 1537 1538 1539 1540 1541
 * The transaction passed to this routine must have made a permanent log
 * reservation of at least XFS_ITRUNCATE_LOG_RES.  This routine may commit the
 * given transaction and start new ones, so make sure everything involved in
 * the transaction is tidy before calling here.  Some transaction will be
 * returned to the caller to be committed.  The incoming transaction must
 * already include the inode, and both inode locks must be held exclusively.
 * The inode must also be "held" within the transaction.  On return the inode
 * will be "held" within the returned transaction.  This routine does NOT
 * require any disk space to be reserved for it within the transaction.
L
Linus Torvalds 已提交
1542
 *
1543 1544 1545 1546 1547
 * If we get an error, we must return with the inode locked and linked into the
 * current transaction. This keeps things simple for the higher level code,
 * because it always knows that the inode is locked and held in the transaction
 * that returns to it whether errors occur or not.  We don't mark the inode
 * dirty on error so that transactions can be easily aborted if possible.
L
Linus Torvalds 已提交
1548 1549
 */
int
1550 1551 1552 1553 1554
xfs_itruncate_extents(
	struct xfs_trans	**tpp,
	struct xfs_inode	*ip,
	int			whichfork,
	xfs_fsize_t		new_size)
L
Linus Torvalds 已提交
1555
{
1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566
	struct xfs_mount	*mp = ip->i_mount;
	struct xfs_trans	*tp = *tpp;
	struct xfs_trans	*ntp;
	xfs_bmap_free_t		free_list;
	xfs_fsblock_t		first_block;
	xfs_fileoff_t		first_unmap_block;
	xfs_fileoff_t		last_block;
	xfs_filblks_t		unmap_len;
	int			committed;
	int			error = 0;
	int			done = 0;
L
Linus Torvalds 已提交
1567

1568 1569 1570
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
	ASSERT(!atomic_read(&VFS_I(ip)->i_count) ||
	       xfs_isilocked(ip, XFS_IOLOCK_EXCL));
1571
	ASSERT(new_size <= XFS_ISIZE(ip));
1572
	ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
L
Linus Torvalds 已提交
1573
	ASSERT(ip->i_itemp != NULL);
1574
	ASSERT(ip->i_itemp->ili_lock_flags == 0);
1575
	ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
L
Linus Torvalds 已提交
1576

1577 1578
	trace_xfs_itruncate_extents_start(ip, new_size);

L
Linus Torvalds 已提交
1579 1580 1581 1582 1583 1584 1585 1586 1587
	/*
	 * Since it is possible for space to become allocated beyond
	 * the end of the file (in a crash where the space is allocated
	 * but the inode size is not yet updated), simply remove any
	 * blocks which show up between the new EOF and the maximum
	 * possible file size.  If the first block to be removed is
	 * beyond the maximum file size (ie it is the same as last_block),
	 * then there is nothing to do.
	 */
1588
	first_unmap_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size);
1589
	last_block = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
1590 1591 1592 1593 1594
	if (first_unmap_block == last_block)
		return 0;

	ASSERT(first_unmap_block < last_block);
	unmap_len = last_block - first_unmap_block + 1;
L
Linus Torvalds 已提交
1595
	while (!done) {
1596
		xfs_bmap_init(&free_list, &first_block);
1597
		error = xfs_bunmapi(tp, ip,
1598
				    first_unmap_block, unmap_len,
1599
				    xfs_bmapi_aflag(whichfork),
L
Linus Torvalds 已提交
1600
				    XFS_ITRUNC_MAX_EXTENTS,
1601
				    &first_block, &free_list,
1602
				    &done);
1603 1604
		if (error)
			goto out_bmap_cancel;
L
Linus Torvalds 已提交
1605 1606 1607 1608 1609

		/*
		 * Duplicate the transaction that has the permanent
		 * reservation and commit the old transaction.
		 */
1610
		error = xfs_bmap_finish(&tp, &free_list, &committed);
1611
		if (committed)
1612
			xfs_trans_ijoin(tp, ip, 0);
1613 1614
		if (error)
			goto out_bmap_cancel;
L
Linus Torvalds 已提交
1615 1616 1617

		if (committed) {
			/*
1618
			 * Mark the inode dirty so it will be logged and
1619
			 * moved forward in the log as part of every commit.
L
Linus Torvalds 已提交
1620
			 */
1621
			xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
L
Linus Torvalds 已提交
1622
		}
1623

1624 1625 1626
		ntp = xfs_trans_dup(tp);
		error = xfs_trans_commit(tp, 0);
		tp = ntp;
1627

1628
		xfs_trans_ijoin(tp, ip, 0);
1629

1630
		if (error)
1631 1632
			goto out;

1633
		/*
1634
		 * Transaction commit worked ok so we can drop the extra ticket
1635 1636
		 * reference that we gained in xfs_trans_dup()
		 */
1637
		xfs_log_ticket_put(tp->t_ticket);
1638
		error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
1639
		if (error)
1640
			goto out;
L
Linus Torvalds 已提交
1641
	}
1642

1643 1644 1645 1646 1647 1648 1649 1650
	/*
	 * Always re-log the inode so that our permanent transaction can keep
	 * on rolling it forward in the log.
	 */
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

	trace_xfs_itruncate_extents_end(ip, new_size);

1651 1652 1653 1654
out:
	*tpp = tp;
	return error;
out_bmap_cancel:
L
Linus Torvalds 已提交
1655
	/*
1656 1657 1658
	 * If the bunmapi call encounters an error, return to the caller where
	 * the transaction can be properly aborted.  We just need to make sure
	 * we're not holding any resources that we were not when we came in.
L
Linus Torvalds 已提交
1659
	 */
1660 1661 1662 1663
	xfs_bmap_cancel(&free_list);
	goto out;
}

D
Dave Chinner 已提交
1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693
int
xfs_release(
	xfs_inode_t	*ip)
{
	xfs_mount_t	*mp = ip->i_mount;
	int		error;

	if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0))
		return 0;

	/* If this is a read-only mount, don't do this (would generate I/O) */
	if (mp->m_flags & XFS_MOUNT_RDONLY)
		return 0;

	if (!XFS_FORCED_SHUTDOWN(mp)) {
		int truncated;

		/*
		 * If we previously truncated this file and removed old data
		 * in the process, we want to initiate "early" writeout on
		 * the last close.  This is an attempt to combat the notorious
		 * NULL files problem which is particularly noticeable from a
		 * truncate down, buffered (re-)write (delalloc), followed by
		 * a crash.  What we are effectively doing here is
		 * significantly reducing the time window where we'd otherwise
		 * be exposed to that problem.
		 */
		truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
		if (truncated) {
			xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE);
D
Dave Chinner 已提交
1694
			if (ip->i_delayed_blks > 0) {
D
Dave Chinner 已提交
1695
				error = filemap_flush(VFS_I(ip)->i_mapping);
D
Dave Chinner 已提交
1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731
				if (error)
					return error;
			}
		}
	}

	if (ip->i_d.di_nlink == 0)
		return 0;

	if (xfs_can_free_eofblocks(ip, false)) {

		/*
		 * If we can't get the iolock just skip truncating the blocks
		 * past EOF because we could deadlock with the mmap_sem
		 * otherwise.  We'll get another chance to drop them once the
		 * last reference to the inode is dropped, so we'll never leak
		 * blocks permanently.
		 *
		 * Further, check if the inode is being opened, written and
		 * closed frequently and we have delayed allocation blocks
		 * outstanding (e.g. streaming writes from the NFS server),
		 * truncating the blocks past EOF will cause fragmentation to
		 * occur.
		 *
		 * In this case don't do the truncation, either, but we have to
		 * be careful how we detect this case. Blocks beyond EOF show
		 * up as i_delayed_blks even when the inode is clean, so we
		 * need to truncate them away first before checking for a dirty
		 * release. Hence on the first dirty close we will still remove
		 * the speculative allocation, but after that we will leave it
		 * in place.
		 */
		if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE))
			return 0;

		error = xfs_free_eofblocks(mp, ip, true);
D
Dave Chinner 已提交
1732
		if (error && error != -EAGAIN)
D
Dave Chinner 已提交
1733 1734 1735 1736 1737 1738 1739 1740 1741
			return error;

		/* delalloc blocks after truncation means it really is dirty */
		if (ip->i_delayed_blks)
			xfs_iflags_set(ip, XFS_IDIRTY_RELEASE);
	}
	return 0;
}

1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793
/*
 * xfs_inactive_truncate
 *
 * Called to perform a truncate when an inode becomes unlinked.
 */
STATIC int
xfs_inactive_truncate(
	struct xfs_inode *ip)
{
	struct xfs_mount	*mp = ip->i_mount;
	struct xfs_trans	*tp;
	int			error;

	tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
	if (error) {
		ASSERT(XFS_FORCED_SHUTDOWN(mp));
		xfs_trans_cancel(tp, 0);
		return error;
	}

	xfs_ilock(ip, XFS_ILOCK_EXCL);
	xfs_trans_ijoin(tp, ip, 0);

	/*
	 * Log the inode size first to prevent stale data exposure in the event
	 * of a system crash before the truncate completes. See the related
	 * comment in xfs_setattr_size() for details.
	 */
	ip->i_d.di_size = 0;
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

	error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
	if (error)
		goto error_trans_cancel;

	ASSERT(ip->i_d.di_nextents == 0);

	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
	if (error)
		goto error_unlock;

	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	return 0;

error_trans_cancel:
	xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
error_unlock:
	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	return error;
}

1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810
/*
 * xfs_inactive_ifree()
 *
 * Perform the inode free when an inode is unlinked.
 */
STATIC int
xfs_inactive_ifree(
	struct xfs_inode *ip)
{
	xfs_bmap_free_t		free_list;
	xfs_fsblock_t		first_block;
	int			committed;
	struct xfs_mount	*mp = ip->i_mount;
	struct xfs_trans	*tp;
	int			error;

	tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829

	/*
	 * The ifree transaction might need to allocate blocks for record
	 * insertion to the finobt. We don't want to fail here at ENOSPC, so
	 * allow ifree to dip into the reserved block pool if necessary.
	 *
	 * Freeing large sets of inodes generally means freeing inode chunks,
	 * directory and file data blocks, so this should be relatively safe.
	 * Only under severe circumstances should it be possible to free enough
	 * inodes to exhaust the reserve block pool via finobt expansion while
	 * at the same time not creating free space in the filesystem.
	 *
	 * Send a warning if the reservation does happen to fail, as the inode
	 * now remains allocated and sits on the unlinked list until the fs is
	 * repaired.
	 */
	tp->t_flags |= XFS_TRANS_RESERVE;
	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ifree,
				  XFS_IFREE_SPACE_RES(mp), 0);
1830
	if (error) {
D
Dave Chinner 已提交
1831
		if (error == -ENOSPC) {
1832 1833 1834 1835 1836 1837
			xfs_warn_ratelimited(mp,
			"Failed to remove inode(s) from unlinked list. "
			"Please free space, unmount and run xfs_repair.");
		} else {
			ASSERT(XFS_FORCED_SHUTDOWN(mp));
		}
1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885
		xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
		return error;
	}

	xfs_ilock(ip, XFS_ILOCK_EXCL);
	xfs_trans_ijoin(tp, ip, 0);

	xfs_bmap_init(&free_list, &first_block);
	error = xfs_ifree(tp, ip, &free_list);
	if (error) {
		/*
		 * If we fail to free the inode, shut down.  The cancel
		 * might do that, we need to make sure.  Otherwise the
		 * inode might be lost for a long time or forever.
		 */
		if (!XFS_FORCED_SHUTDOWN(mp)) {
			xfs_notice(mp, "%s: xfs_ifree returned error %d",
				__func__, error);
			xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
		}
		xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
		xfs_iunlock(ip, XFS_ILOCK_EXCL);
		return error;
	}

	/*
	 * Credit the quota account(s). The inode is gone.
	 */
	xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1);

	/*
	 * Just ignore errors at this point.  There is nothing we can
	 * do except to try to keep going. Make sure it's not a silent
	 * error.
	 */
	error = xfs_bmap_finish(&tp,  &free_list, &committed);
	if (error)
		xfs_notice(mp, "%s: xfs_bmap_finish returned error %d",
			__func__, error);
	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
	if (error)
		xfs_notice(mp, "%s: xfs_trans_commit returned error %d",
			__func__, error);

	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	return 0;
}

D
Dave Chinner 已提交
1886 1887 1888 1889 1890 1891 1892 1893
/*
 * xfs_inactive
 *
 * This is called when the vnode reference count for the vnode
 * goes to zero.  If the file has been unlinked, then it must
 * now be truncated.  Also, we clear all of the read-ahead state
 * kept for the inode here since the file is now closed.
 */
1894
void
D
Dave Chinner 已提交
1895 1896 1897
xfs_inactive(
	xfs_inode_t	*ip)
{
1898 1899 1900
	struct xfs_mount	*mp;
	int			error;
	int			truncate = 0;
D
Dave Chinner 已提交
1901 1902 1903 1904 1905

	/*
	 * If the inode is already free, then there can be nothing
	 * to clean up here.
	 */
B
Ben Myers 已提交
1906
	if (ip->i_d.di_mode == 0) {
D
Dave Chinner 已提交
1907 1908
		ASSERT(ip->i_df.if_real_bytes == 0);
		ASSERT(ip->i_df.if_broot_bytes == 0);
1909
		return;
D
Dave Chinner 已提交
1910 1911 1912 1913 1914 1915
	}

	mp = ip->i_mount;

	/* If this is a read-only mount, don't do this (would generate I/O) */
	if (mp->m_flags & XFS_MOUNT_RDONLY)
1916
		return;
D
Dave Chinner 已提交
1917 1918 1919 1920 1921 1922 1923

	if (ip->i_d.di_nlink != 0) {
		/*
		 * force is true because we are evicting an inode from the
		 * cache. Post-eof blocks must be freed, lest we end up with
		 * broken free space accounting.
		 */
1924 1925 1926 1927
		if (xfs_can_free_eofblocks(ip, true))
			xfs_free_eofblocks(mp, ip, false);

		return;
D
Dave Chinner 已提交
1928 1929 1930 1931 1932 1933 1934 1935 1936
	}

	if (S_ISREG(ip->i_d.di_mode) &&
	    (ip->i_d.di_size != 0 || XFS_ISIZE(ip) != 0 ||
	     ip->i_d.di_nextents > 0 || ip->i_delayed_blks > 0))
		truncate = 1;

	error = xfs_qm_dqattach(ip, 0);
	if (error)
1937
		return;
D
Dave Chinner 已提交
1938

1939
	if (S_ISLNK(ip->i_d.di_mode))
1940
		error = xfs_inactive_symlink(ip);
1941 1942 1943
	else if (truncate)
		error = xfs_inactive_truncate(ip);
	if (error)
1944
		return;
D
Dave Chinner 已提交
1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956

	/*
	 * If there are attributes associated with the file then blow them away
	 * now.  The code calls a routine that recursively deconstructs the
	 * attribute fork.  We need to just commit the current transaction
	 * because we can't use it for xfs_attr_inactive().
	 */
	if (ip->i_d.di_anextents > 0) {
		ASSERT(ip->i_d.di_forkoff != 0);

		error = xfs_attr_inactive(ip);
		if (error)
1957
			return;
D
Dave Chinner 已提交
1958 1959 1960 1961 1962 1963 1964 1965 1966 1967
	}

	if (ip->i_afp)
		xfs_idestroy_fork(ip, XFS_ATTR_FORK);

	ASSERT(ip->i_d.di_anextents == 0);

	/*
	 * Free the inode.
	 */
1968 1969
	error = xfs_inactive_ifree(ip);
	if (error)
1970
		return;
D
Dave Chinner 已提交
1971 1972 1973 1974 1975 1976 1977

	/*
	 * Release the dquots held by inode, if any.
	 */
	xfs_qm_dqdetach(ip);
}

L
Linus Torvalds 已提交
1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
/*
 * This is called when the inode's link count goes to 0.
 * We place the on-disk inode on a list in the AGI.  It
 * will be pulled from this list when the inode is freed.
 */
int
xfs_iunlink(
	xfs_trans_t	*tp,
	xfs_inode_t	*ip)
{
	xfs_mount_t	*mp;
	xfs_agi_t	*agi;
	xfs_dinode_t	*dip;
	xfs_buf_t	*agibp;
	xfs_buf_t	*ibp;
	xfs_agino_t	agino;
	short		bucket_index;
	int		offset;
	int		error;

	ASSERT(ip->i_d.di_nlink == 0);
	ASSERT(ip->i_d.di_mode != 0);

	mp = tp->t_mountp;

	/*
	 * Get the agi buffer first.  It ensures lock ordering
	 * on the list.
	 */
2007
	error = xfs_read_agi(mp, tp, XFS_INO_TO_AGNO(mp, ip->i_ino), &agibp);
2008
	if (error)
L
Linus Torvalds 已提交
2009 2010
		return error;
	agi = XFS_BUF_TO_AGI(agibp);
2011

L
Linus Torvalds 已提交
2012 2013 2014 2015 2016 2017 2018 2019
	/*
	 * Get the index into the agi hash table for the
	 * list this inode will go on.
	 */
	agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
	ASSERT(agino != 0);
	bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
	ASSERT(agi->agi_unlinked[bucket_index]);
2020
	ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != agino);
L
Linus Torvalds 已提交
2021

2022
	if (agi->agi_unlinked[bucket_index] != cpu_to_be32(NULLAGINO)) {
L
Linus Torvalds 已提交
2023 2024 2025 2026 2027 2028
		/*
		 * There is already another inode in the bucket we need
		 * to add ourselves to.  Add us at the front of the list.
		 * Here we put the head pointer into our next pointer,
		 * and then we fall through to point the head at us.
		 */
2029 2030
		error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp,
				       0, 0);
2031 2032 2033
		if (error)
			return error;

2034
		ASSERT(dip->di_next_unlinked == cpu_to_be32(NULLAGINO));
L
Linus Torvalds 已提交
2035
		dip->di_next_unlinked = agi->agi_unlinked[bucket_index];
2036
		offset = ip->i_imap.im_boffset +
L
Linus Torvalds 已提交
2037
			offsetof(xfs_dinode_t, di_next_unlinked);
2038 2039 2040 2041

		/* need to recalc the inode CRC if appropriate */
		xfs_dinode_calc_crc(mp, dip);

L
Linus Torvalds 已提交
2042 2043 2044 2045 2046 2047 2048 2049 2050 2051
		xfs_trans_inode_buf(tp, ibp);
		xfs_trans_log_buf(tp, ibp, offset,
				  (offset + sizeof(xfs_agino_t) - 1));
		xfs_inobp_check(mp, ibp);
	}

	/*
	 * Point the bucket head pointer at the inode being inserted.
	 */
	ASSERT(agino != 0);
2052
	agi->agi_unlinked[bucket_index] = cpu_to_be32(agino);
L
Linus Torvalds 已提交
2053 2054
	offset = offsetof(xfs_agi_t, agi_unlinked) +
		(sizeof(xfs_agino_t) * bucket_index);
2055
	xfs_trans_buf_set_type(tp, agibp, XFS_BLFT_AGI_BUF);
L
Linus Torvalds 已提交
2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078
	xfs_trans_log_buf(tp, agibp, offset,
			  (offset + sizeof(xfs_agino_t) - 1));
	return 0;
}

/*
 * Pull the on-disk inode from the AGI unlinked list.
 */
STATIC int
xfs_iunlink_remove(
	xfs_trans_t	*tp,
	xfs_inode_t	*ip)
{
	xfs_ino_t	next_ino;
	xfs_mount_t	*mp;
	xfs_agi_t	*agi;
	xfs_dinode_t	*dip;
	xfs_buf_t	*agibp;
	xfs_buf_t	*ibp;
	xfs_agnumber_t	agno;
	xfs_agino_t	agino;
	xfs_agino_t	next_agino;
	xfs_buf_t	*last_ibp;
2079
	xfs_dinode_t	*last_dip = NULL;
L
Linus Torvalds 已提交
2080
	short		bucket_index;
2081
	int		offset, last_offset = 0;
L
Linus Torvalds 已提交
2082 2083 2084 2085 2086 2087 2088 2089 2090
	int		error;

	mp = tp->t_mountp;
	agno = XFS_INO_TO_AGNO(mp, ip->i_ino);

	/*
	 * Get the agi buffer first.  It ensures lock ordering
	 * on the list.
	 */
2091 2092
	error = xfs_read_agi(mp, tp, agno, &agibp);
	if (error)
L
Linus Torvalds 已提交
2093
		return error;
2094

L
Linus Torvalds 已提交
2095
	agi = XFS_BUF_TO_AGI(agibp);
2096

L
Linus Torvalds 已提交
2097 2098 2099 2100 2101 2102 2103
	/*
	 * Get the index into the agi hash table for the
	 * list this inode will go on.
	 */
	agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
	ASSERT(agino != 0);
	bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
2104
	ASSERT(agi->agi_unlinked[bucket_index] != cpu_to_be32(NULLAGINO));
L
Linus Torvalds 已提交
2105 2106
	ASSERT(agi->agi_unlinked[bucket_index]);

2107
	if (be32_to_cpu(agi->agi_unlinked[bucket_index]) == agino) {
L
Linus Torvalds 已提交
2108
		/*
2109 2110 2111 2112 2113
		 * We're at the head of the list.  Get the inode's on-disk
		 * buffer to see if there is anyone after us on the list.
		 * Only modify our next pointer if it is not already NULLAGINO.
		 * This saves us the overhead of dealing with the buffer when
		 * there is no need to change it.
L
Linus Torvalds 已提交
2114
		 */
2115 2116
		error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp,
				       0, 0);
L
Linus Torvalds 已提交
2117
		if (error) {
2118
			xfs_warn(mp, "%s: xfs_imap_to_bp returned error %d.",
2119
				__func__, error);
L
Linus Torvalds 已提交
2120 2121
			return error;
		}
2122
		next_agino = be32_to_cpu(dip->di_next_unlinked);
L
Linus Torvalds 已提交
2123 2124
		ASSERT(next_agino != 0);
		if (next_agino != NULLAGINO) {
2125
			dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
2126
			offset = ip->i_imap.im_boffset +
L
Linus Torvalds 已提交
2127
				offsetof(xfs_dinode_t, di_next_unlinked);
2128 2129 2130 2131

			/* need to recalc the inode CRC if appropriate */
			xfs_dinode_calc_crc(mp, dip);

L
Linus Torvalds 已提交
2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143
			xfs_trans_inode_buf(tp, ibp);
			xfs_trans_log_buf(tp, ibp, offset,
					  (offset + sizeof(xfs_agino_t) - 1));
			xfs_inobp_check(mp, ibp);
		} else {
			xfs_trans_brelse(tp, ibp);
		}
		/*
		 * Point the bucket head pointer at the next inode.
		 */
		ASSERT(next_agino != 0);
		ASSERT(next_agino != agino);
2144
		agi->agi_unlinked[bucket_index] = cpu_to_be32(next_agino);
L
Linus Torvalds 已提交
2145 2146
		offset = offsetof(xfs_agi_t, agi_unlinked) +
			(sizeof(xfs_agino_t) * bucket_index);
2147
		xfs_trans_buf_set_type(tp, agibp, XFS_BLFT_AGI_BUF);
L
Linus Torvalds 已提交
2148 2149 2150 2151 2152 2153
		xfs_trans_log_buf(tp, agibp, offset,
				  (offset + sizeof(xfs_agino_t) - 1));
	} else {
		/*
		 * We need to search the list for the inode being freed.
		 */
2154
		next_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]);
L
Linus Torvalds 已提交
2155 2156
		last_ibp = NULL;
		while (next_agino != agino) {
C
Christoph Hellwig 已提交
2157 2158 2159
			struct xfs_imap	imap;

			if (last_ibp)
L
Linus Torvalds 已提交
2160
				xfs_trans_brelse(tp, last_ibp);
C
Christoph Hellwig 已提交
2161 2162

			imap.im_blkno = 0;
L
Linus Torvalds 已提交
2163
			next_ino = XFS_AGINO_TO_INO(mp, agno, next_agino);
C
Christoph Hellwig 已提交
2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174

			error = xfs_imap(mp, tp, next_ino, &imap, 0);
			if (error) {
				xfs_warn(mp,
	"%s: xfs_imap returned error %d.",
					 __func__, error);
				return error;
			}

			error = xfs_imap_to_bp(mp, tp, &imap, &last_dip,
					       &last_ibp, 0, 0);
L
Linus Torvalds 已提交
2175
			if (error) {
2176
				xfs_warn(mp,
C
Christoph Hellwig 已提交
2177
	"%s: xfs_imap_to_bp returned error %d.",
2178
					__func__, error);
L
Linus Torvalds 已提交
2179 2180
				return error;
			}
C
Christoph Hellwig 已提交
2181 2182

			last_offset = imap.im_boffset;
2183
			next_agino = be32_to_cpu(last_dip->di_next_unlinked);
L
Linus Torvalds 已提交
2184 2185 2186
			ASSERT(next_agino != NULLAGINO);
			ASSERT(next_agino != 0);
		}
2187

L
Linus Torvalds 已提交
2188
		/*
2189 2190
		 * Now last_ibp points to the buffer previous to us on the
		 * unlinked list.  Pull us from the list.
L
Linus Torvalds 已提交
2191
		 */
2192 2193
		error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp,
				       0, 0);
L
Linus Torvalds 已提交
2194
		if (error) {
2195
			xfs_warn(mp, "%s: xfs_imap_to_bp(2) returned error %d.",
2196
				__func__, error);
L
Linus Torvalds 已提交
2197 2198
			return error;
		}
2199
		next_agino = be32_to_cpu(dip->di_next_unlinked);
L
Linus Torvalds 已提交
2200 2201 2202
		ASSERT(next_agino != 0);
		ASSERT(next_agino != agino);
		if (next_agino != NULLAGINO) {
2203
			dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
2204
			offset = ip->i_imap.im_boffset +
L
Linus Torvalds 已提交
2205
				offsetof(xfs_dinode_t, di_next_unlinked);
2206 2207 2208 2209

			/* need to recalc the inode CRC if appropriate */
			xfs_dinode_calc_crc(mp, dip);

L
Linus Torvalds 已提交
2210 2211 2212 2213 2214 2215 2216 2217 2218 2219
			xfs_trans_inode_buf(tp, ibp);
			xfs_trans_log_buf(tp, ibp, offset,
					  (offset + sizeof(xfs_agino_t) - 1));
			xfs_inobp_check(mp, ibp);
		} else {
			xfs_trans_brelse(tp, ibp);
		}
		/*
		 * Point the previous inode on the list to the next inode.
		 */
2220
		last_dip->di_next_unlinked = cpu_to_be32(next_agino);
L
Linus Torvalds 已提交
2221 2222
		ASSERT(next_agino != 0);
		offset = last_offset + offsetof(xfs_dinode_t, di_next_unlinked);
2223 2224 2225 2226

		/* need to recalc the inode CRC if appropriate */
		xfs_dinode_calc_crc(mp, last_dip);

L
Linus Torvalds 已提交
2227 2228 2229 2230 2231 2232 2233 2234
		xfs_trans_inode_buf(tp, last_ibp);
		xfs_trans_log_buf(tp, last_ibp, offset,
				  (offset + sizeof(xfs_agino_t) - 1));
		xfs_inobp_check(mp, last_ibp);
	}
	return 0;
}

2235
/*
2236
 * A big issue when freeing the inode cluster is that we _cannot_ skip any
2237 2238 2239
 * inodes that are in memory - they all must be marked stale and attached to
 * the cluster buffer.
 */
2240
STATIC int
L
Linus Torvalds 已提交
2241 2242 2243 2244 2245 2246 2247
xfs_ifree_cluster(
	xfs_inode_t	*free_ip,
	xfs_trans_t	*tp,
	xfs_ino_t	inum)
{
	xfs_mount_t		*mp = free_ip->i_mount;
	int			blks_per_cluster;
2248
	int			inodes_per_cluster;
L
Linus Torvalds 已提交
2249
	int			nbufs;
2250
	int			i, j;
L
Linus Torvalds 已提交
2251 2252
	xfs_daddr_t		blkno;
	xfs_buf_t		*bp;
2253
	xfs_inode_t		*ip;
L
Linus Torvalds 已提交
2254 2255
	xfs_inode_log_item_t	*iip;
	xfs_log_item_t		*lip;
D
Dave Chinner 已提交
2256
	struct xfs_perag	*pag;
L
Linus Torvalds 已提交
2257

D
Dave Chinner 已提交
2258
	pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, inum));
2259 2260 2261
	blks_per_cluster = xfs_icluster_size_fsb(mp);
	inodes_per_cluster = blks_per_cluster << mp->m_sb.sb_inopblog;
	nbufs = mp->m_ialloc_blks / blks_per_cluster;
L
Linus Torvalds 已提交
2262

2263
	for (j = 0; j < nbufs; j++, inum += inodes_per_cluster) {
L
Linus Torvalds 已提交
2264 2265 2266
		blkno = XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, inum),
					 XFS_INO_TO_AGBNO(mp, inum));

2267 2268 2269 2270 2271 2272 2273 2274 2275
		/*
		 * We obtain and lock the backing buffer first in the process
		 * here, as we have to ensure that any dirty inode that we
		 * can't get the flush lock on is attached to the buffer.
		 * If we scan the in-memory inodes first, then buffer IO can
		 * complete before we get a lock on it, and hence we may fail
		 * to mark all the active inodes on the buffer stale.
		 */
		bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, blkno,
2276 2277
					mp->m_bsize * blks_per_cluster,
					XBF_UNMAPPED);
2278

2279
		if (!bp)
D
Dave Chinner 已提交
2280
			return -ENOMEM;
2281 2282 2283 2284 2285 2286 2287 2288 2289 2290

		/*
		 * This buffer may not have been correctly initialised as we
		 * didn't read it from disk. That's not important because we are
		 * only using to mark the buffer as stale in the log, and to
		 * attach stale cached inodes on it. That means it will never be
		 * dispatched for IO. If it is, we want to know about it, and we
		 * want it to fail. We can acheive this by adding a write
		 * verifier to the buffer.
		 */
2291
		 bp->b_ops = &xfs_inode_buf_ops;
2292

2293 2294 2295
		/*
		 * Walk the inodes already attached to the buffer and mark them
		 * stale. These will all have the flush locks held, so an
2296 2297 2298
		 * in-memory inode walk can't lock them. By marking them all
		 * stale first, we will not attempt to lock them in the loop
		 * below as the XFS_ISTALE flag will be set.
2299
		 */
2300
		lip = bp->b_fspriv;
2301 2302 2303 2304
		while (lip) {
			if (lip->li_type == XFS_LI_INODE) {
				iip = (xfs_inode_log_item_t *)lip;
				ASSERT(iip->ili_logged == 1);
2305
				lip->li_cb = xfs_istale_done;
2306 2307 2308 2309 2310 2311 2312
				xfs_trans_ail_copy_lsn(mp->m_ail,
							&iip->ili_flush_lsn,
							&iip->ili_item.li_lsn);
				xfs_iflags_set(iip->ili_inode, XFS_ISTALE);
			}
			lip = lip->li_bio_list;
		}
L
Linus Torvalds 已提交
2313

2314

L
Linus Torvalds 已提交
2315
		/*
2316 2317 2318 2319
		 * For each inode in memory attempt to add it to the inode
		 * buffer and set it up for being staled on buffer IO
		 * completion.  This is safe as we've locked out tail pushing
		 * and flushing by locking the buffer.
L
Linus Torvalds 已提交
2320
		 *
2321 2322 2323
		 * We have already marked every inode that was part of a
		 * transaction stale above, which means there is no point in
		 * even trying to lock them.
L
Linus Torvalds 已提交
2324
		 */
2325
		for (i = 0; i < inodes_per_cluster; i++) {
2326
retry:
2327
			rcu_read_lock();
2328 2329
			ip = radix_tree_lookup(&pag->pag_ici_root,
					XFS_INO_TO_AGINO(mp, (inum + i)));
L
Linus Torvalds 已提交
2330

2331 2332 2333
			/* Inode not in memory, nothing to do */
			if (!ip) {
				rcu_read_unlock();
L
Linus Torvalds 已提交
2334 2335 2336
				continue;
			}

2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352
			/*
			 * because this is an RCU protected lookup, we could
			 * find a recently freed or even reallocated inode
			 * during the lookup. We need to check under the
			 * i_flags_lock for a valid inode here. Skip it if it
			 * is not valid, the wrong inode or stale.
			 */
			spin_lock(&ip->i_flags_lock);
			if (ip->i_ino != inum + i ||
			    __xfs_iflags_test(ip, XFS_ISTALE)) {
				spin_unlock(&ip->i_flags_lock);
				rcu_read_unlock();
				continue;
			}
			spin_unlock(&ip->i_flags_lock);

2353 2354 2355 2356 2357 2358 2359
			/*
			 * Don't try to lock/unlock the current inode, but we
			 * _cannot_ skip the other inodes that we did not find
			 * in the list attached to the buffer and are not
			 * already marked stale. If we can't lock it, back off
			 * and retry.
			 */
2360 2361
			if (ip != free_ip &&
			    !xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) {
2362
				rcu_read_unlock();
2363 2364
				delay(1);
				goto retry;
L
Linus Torvalds 已提交
2365
			}
2366
			rcu_read_unlock();
L
Linus Torvalds 已提交
2367

2368
			xfs_iflock(ip);
2369
			xfs_iflags_set(ip, XFS_ISTALE);
L
Linus Torvalds 已提交
2370

2371 2372 2373 2374
			/*
			 * we don't need to attach clean inodes or those only
			 * with unlogged changes (which we throw away, anyway).
			 */
L
Linus Torvalds 已提交
2375
			iip = ip->i_itemp;
2376
			if (!iip || xfs_inode_clean(ip)) {
2377
				ASSERT(ip != free_ip);
L
Linus Torvalds 已提交
2378 2379 2380 2381 2382
				xfs_ifunlock(ip);
				xfs_iunlock(ip, XFS_ILOCK_EXCL);
				continue;
			}

2383 2384
			iip->ili_last_fields = iip->ili_fields;
			iip->ili_fields = 0;
L
Linus Torvalds 已提交
2385
			iip->ili_logged = 1;
2386 2387
			xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
						&iip->ili_item.li_lsn);
L
Linus Torvalds 已提交
2388

2389 2390
			xfs_buf_attach_iodone(bp, xfs_istale_done,
						  &iip->ili_item);
2391 2392

			if (ip != free_ip)
L
Linus Torvalds 已提交
2393 2394 2395
				xfs_iunlock(ip, XFS_ILOCK_EXCL);
		}

2396
		xfs_trans_stale_inode_buf(tp, bp);
L
Linus Torvalds 已提交
2397 2398 2399
		xfs_trans_binval(tp, bp);
	}

D
Dave Chinner 已提交
2400
	xfs_perag_put(pag);
2401
	return 0;
L
Linus Torvalds 已提交
2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423
}

/*
 * This is called to return an inode to the inode free list.
 * The inode should already be truncated to 0 length and have
 * no pages associated with it.  This routine also assumes that
 * the inode is already a part of the transaction.
 *
 * The on-disk copy of the inode will have been added to the list
 * of unlinked inodes in the AGI. We need to remove the inode from
 * that list atomically with respect to freeing it here.
 */
int
xfs_ifree(
	xfs_trans_t	*tp,
	xfs_inode_t	*ip,
	xfs_bmap_free_t	*flist)
{
	int			error;
	int			delete;
	xfs_ino_t		first_ino;

C
Christoph Hellwig 已提交
2424
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
L
Linus Torvalds 已提交
2425 2426 2427
	ASSERT(ip->i_d.di_nlink == 0);
	ASSERT(ip->i_d.di_nextents == 0);
	ASSERT(ip->i_d.di_anextents == 0);
2428
	ASSERT(ip->i_d.di_size == 0 || !S_ISREG(ip->i_d.di_mode));
L
Linus Torvalds 已提交
2429 2430 2431 2432 2433 2434
	ASSERT(ip->i_d.di_nblocks == 0);

	/*
	 * Pull the on-disk inode from the AGI unlinked list.
	 */
	error = xfs_iunlink_remove(tp, ip);
2435
	if (error)
L
Linus Torvalds 已提交
2436 2437 2438
		return error;

	error = xfs_difree(tp, ip->i_ino, flist, &delete, &first_ino);
2439
	if (error)
L
Linus Torvalds 已提交
2440
		return error;
2441

L
Linus Torvalds 已提交
2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454
	ip->i_d.di_mode = 0;		/* mark incore inode as free */
	ip->i_d.di_flags = 0;
	ip->i_d.di_dmevmask = 0;
	ip->i_d.di_forkoff = 0;		/* mark the attr fork not in use */
	ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS;
	ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
	/*
	 * Bump the generation count so no one will be confused
	 * by reincarnations of this inode.
	 */
	ip->i_d.di_gen++;
	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

2455
	if (delete)
2456
		error = xfs_ifree_cluster(ip, tp, first_ino);
L
Linus Torvalds 已提交
2457

2458
	return error;
L
Linus Torvalds 已提交
2459 2460 2461
}

/*
2462 2463 2464
 * This is called to unpin an inode.  The caller must have the inode locked
 * in at least shared mode so that the buffer cannot be subsequently pinned
 * once someone is waiting for it to be unpinned.
L
Linus Torvalds 已提交
2465
 */
2466
static void
2467
xfs_iunpin(
2468
	struct xfs_inode	*ip)
L
Linus Torvalds 已提交
2469
{
C
Christoph Hellwig 已提交
2470
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
L
Linus Torvalds 已提交
2471

2472 2473
	trace_xfs_inode_unpin_nowait(ip, _RET_IP_);

2474
	/* Give the log a push to start the unpinning I/O */
2475
	xfs_log_force_lsn(ip->i_mount, ip->i_itemp->ili_last_lsn, 0);
2476

2477
}
L
Linus Torvalds 已提交
2478

2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495
static void
__xfs_iunpin_wait(
	struct xfs_inode	*ip)
{
	wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IPINNED_BIT);
	DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IPINNED_BIT);

	xfs_iunpin(ip);

	do {
		prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE);
		if (xfs_ipincount(ip))
			io_schedule();
	} while (xfs_ipincount(ip));
	finish_wait(wq, &wait.wait);
}

2496
void
2497
xfs_iunpin_wait(
2498
	struct xfs_inode	*ip)
2499
{
2500 2501
	if (xfs_ipincount(ip))
		__xfs_iunpin_wait(ip);
L
Linus Torvalds 已提交
2502 2503
}

2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530
/*
 * Removing an inode from the namespace involves removing the directory entry
 * and dropping the link count on the inode. Removing the directory entry can
 * result in locking an AGF (directory blocks were freed) and removing a link
 * count can result in placing the inode on an unlinked list which results in
 * locking an AGI.
 *
 * The big problem here is that we have an ordering constraint on AGF and AGI
 * locking - inode allocation locks the AGI, then can allocate a new extent for
 * new inodes, locking the AGF after the AGI. Similarly, freeing the inode
 * removes the inode from the unlinked list, requiring that we lock the AGI
 * first, and then freeing the inode can result in an inode chunk being freed
 * and hence freeing disk space requiring that we lock an AGF.
 *
 * Hence the ordering that is imposed by other parts of the code is AGI before
 * AGF. This means we cannot remove the directory entry before we drop the inode
 * reference count and put it on the unlinked list as this results in a lock
 * order of AGF then AGI, and this can deadlock against inode allocation and
 * freeing. Therefore we must drop the link counts before we remove the
 * directory entry.
 *
 * This is still safe from a transactional point of view - it is not until we
 * get to xfs_bmap_finish() that we have the possibility of multiple
 * transactions in this operation. Hence as long as we remove the directory
 * entry and drop the link count in the first transaction of the remove
 * operation, there are no transactional constraints on the ordering here.
 */
D
Dave Chinner 已提交
2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549
int
xfs_remove(
	xfs_inode_t             *dp,
	struct xfs_name		*name,
	xfs_inode_t		*ip)
{
	xfs_mount_t		*mp = dp->i_mount;
	xfs_trans_t             *tp = NULL;
	int			is_dir = S_ISDIR(ip->i_d.di_mode);
	int                     error = 0;
	xfs_bmap_free_t         free_list;
	xfs_fsblock_t           first_block;
	int			cancel_flags;
	int			committed;
	uint			resblks;

	trace_xfs_remove(dp, name);

	if (XFS_FORCED_SHUTDOWN(mp))
D
Dave Chinner 已提交
2550
		return -EIO;
D
Dave Chinner 已提交
2551 2552 2553 2554 2555 2556 2557 2558 2559

	error = xfs_qm_dqattach(dp, 0);
	if (error)
		goto std_return;

	error = xfs_qm_dqattach(ip, 0);
	if (error)
		goto std_return;

D
Dave Chinner 已提交
2560
	if (is_dir)
D
Dave Chinner 已提交
2561
		tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR);
D
Dave Chinner 已提交
2562
	else
D
Dave Chinner 已提交
2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575
		tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE);
	cancel_flags = XFS_TRANS_RELEASE_LOG_RES;

	/*
	 * We try to get the real space reservation first,
	 * allowing for directory btree deletion(s) implying
	 * possible bmap insert(s).  If we can't get the space
	 * reservation then we use 0 instead, and avoid the bmap
	 * btree insert(s) in the directory code by, if the bmap
	 * insert tries to happen, instead trimming the LAST
	 * block from the directory.
	 */
	resblks = XFS_REMOVE_SPACE_RES(mp);
2576
	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_remove, resblks, 0);
D
Dave Chinner 已提交
2577
	if (error == -ENOSPC) {
D
Dave Chinner 已提交
2578
		resblks = 0;
2579
		error = xfs_trans_reserve(tp, &M_RES(mp)->tr_remove, 0, 0);
D
Dave Chinner 已提交
2580 2581
	}
	if (error) {
D
Dave Chinner 已提交
2582
		ASSERT(error != -ENOSPC);
D
Dave Chinner 已提交
2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594
		cancel_flags = 0;
		goto out_trans_cancel;
	}

	xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL);

	xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);

	/*
	 * If we're removing a directory perform some additional validation.
	 */
2595
	cancel_flags |= XFS_TRANS_ABORT;
D
Dave Chinner 已提交
2596 2597 2598
	if (is_dir) {
		ASSERT(ip->i_d.di_nlink >= 2);
		if (ip->i_d.di_nlink != 2) {
D
Dave Chinner 已提交
2599
			error = -ENOTEMPTY;
D
Dave Chinner 已提交
2600 2601 2602
			goto out_trans_cancel;
		}
		if (!xfs_dir_isempty(ip)) {
D
Dave Chinner 已提交
2603
			error = -ENOTEMPTY;
D
Dave Chinner 已提交
2604 2605 2606
			goto out_trans_cancel;
		}

2607
		/* Drop the link from ip's "..".  */
D
Dave Chinner 已提交
2608 2609
		error = xfs_droplink(tp, dp);
		if (error)
2610
			goto out_trans_cancel;
D
Dave Chinner 已提交
2611

2612
		/* Drop the "." link from ip to self.  */
D
Dave Chinner 已提交
2613 2614
		error = xfs_droplink(tp, ip);
		if (error)
2615
			goto out_trans_cancel;
D
Dave Chinner 已提交
2616 2617 2618 2619 2620 2621 2622 2623
	} else {
		/*
		 * When removing a non-directory we need to log the parent
		 * inode here.  For a directory this is done implicitly
		 * by the xfs_droplink call for the ".." entry.
		 */
		xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
	}
2624
	xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
D
Dave Chinner 已提交
2625

2626
	/* Drop the link from dp to ip. */
D
Dave Chinner 已提交
2627 2628
	error = xfs_droplink(tp, ip);
	if (error)
2629
		goto out_trans_cancel;
D
Dave Chinner 已提交
2630

2631 2632 2633 2634
	xfs_bmap_init(&free_list, &first_block);
	error = xfs_dir_removename(tp, dp, name, ip->i_ino,
					&first_block, &free_list, resblks);
	if (error) {
D
Dave Chinner 已提交
2635
		ASSERT(error != -ENOENT);
2636 2637 2638
		goto out_bmap_cancel;
	}

D
Dave Chinner 已提交
2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654
	/*
	 * If this is a synchronous mount, make sure that the
	 * remove transaction goes to disk before returning to
	 * the user.
	 */
	if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
		xfs_trans_set_sync(tp);

	error = xfs_bmap_finish(&tp, &free_list, &committed);
	if (error)
		goto out_bmap_cancel;

	error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
	if (error)
		goto std_return;

2655
	if (is_dir && xfs_inode_is_filestream(ip))
D
Dave Chinner 已提交
2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667
		xfs_filestream_deassociate(ip);

	return 0;

 out_bmap_cancel:
	xfs_bmap_cancel(&free_list);
 out_trans_cancel:
	xfs_trans_cancel(tp, cancel_flags);
 std_return:
	return error;
}

D
Dave Chinner 已提交
2668 2669 2670
/*
 * Enter all inodes for a rename transaction into a sorted array.
 */
2671
#define __XFS_SORT_INODES	5
D
Dave Chinner 已提交
2672 2673
STATIC void
xfs_sort_for_rename(
2674 2675 2676 2677 2678 2679 2680
	struct xfs_inode	*dp1,	/* in: old (source) directory inode */
	struct xfs_inode	*dp2,	/* in: new (target) directory inode */
	struct xfs_inode	*ip1,	/* in: inode of old entry */
	struct xfs_inode	*ip2,	/* in: inode of new entry */
	struct xfs_inode	*wip,	/* in: whiteout inode */
	struct xfs_inode	**i_tab,/* out: sorted array of inodes */
	int			*num_inodes)  /* in/out: inodes in array */
D
Dave Chinner 已提交
2681 2682 2683
{
	int			i, j;

2684 2685 2686
	ASSERT(*num_inodes == __XFS_SORT_INODES);
	memset(i_tab, 0, *num_inodes * sizeof(struct xfs_inode *));

D
Dave Chinner 已提交
2687 2688 2689 2690 2691 2692 2693
	/*
	 * i_tab contains a list of pointers to inodes.  We initialize
	 * the table here & we'll sort it.  We will then use it to
	 * order the acquisition of the inode locks.
	 *
	 * Note that the table may contain duplicates.  e.g., dp1 == dp2.
	 */
2694 2695 2696 2697 2698 2699 2700 2701 2702
	i = 0;
	i_tab[i++] = dp1;
	i_tab[i++] = dp2;
	i_tab[i++] = ip1;
	if (ip2)
		i_tab[i++] = ip2;
	if (wip)
		i_tab[i++] = wip;
	*num_inodes = i;
D
Dave Chinner 已提交
2703 2704 2705

	/*
	 * Sort the elements via bubble sort.  (Remember, there are at
2706
	 * most 5 elements to sort, so this is adequate.)
D
Dave Chinner 已提交
2707 2708 2709 2710
	 */
	for (i = 0; i < *num_inodes; i++) {
		for (j = 1; j < *num_inodes; j++) {
			if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) {
2711
				struct xfs_inode *temp = i_tab[j];
D
Dave Chinner 已提交
2712 2713 2714 2715 2716 2717 2718
				i_tab[j] = i_tab[j-1];
				i_tab[j-1] = temp;
			}
		}
	}
}

2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743
static int
xfs_finish_rename(
	struct xfs_trans	*tp,
	struct xfs_bmap_free	*free_list)
{
	int			committed = 0;
	int			error;

	/*
	 * If this is a synchronous mount, make sure that the rename transaction
	 * goes to disk before returning to the user.
	 */
	if (tp->t_mountp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
		xfs_trans_set_sync(tp);

	error = xfs_bmap_finish(&tp, free_list, &committed);
	if (error) {
		xfs_bmap_cancel(free_list);
		xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
		return error;
	}

	return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
}

2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771
/*
 * xfs_cross_rename()
 *
 * responsible for handling RENAME_EXCHANGE flag in renameat2() sytemcall
 */
STATIC int
xfs_cross_rename(
	struct xfs_trans	*tp,
	struct xfs_inode	*dp1,
	struct xfs_name		*name1,
	struct xfs_inode	*ip1,
	struct xfs_inode	*dp2,
	struct xfs_name		*name2,
	struct xfs_inode	*ip2,
	struct xfs_bmap_free	*free_list,
	xfs_fsblock_t		*first_block,
	int			spaceres)
{
	int		error = 0;
	int		ip1_flags = 0;
	int		ip2_flags = 0;
	int		dp2_flags = 0;

	/* Swap inode number for dirent in first parent */
	error = xfs_dir_replace(tp, dp1, name1,
				ip2->i_ino,
				first_block, free_list, spaceres);
	if (error)
2772
		goto out_trans_abort;
2773 2774 2775 2776 2777 2778

	/* Swap inode number for dirent in second parent */
	error = xfs_dir_replace(tp, dp2, name2,
				ip1->i_ino,
				first_block, free_list, spaceres);
	if (error)
2779
		goto out_trans_abort;
2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793

	/*
	 * If we're renaming one or more directories across different parents,
	 * update the respective ".." entries (and link counts) to match the new
	 * parents.
	 */
	if (dp1 != dp2) {
		dp2_flags = XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;

		if (S_ISDIR(ip2->i_d.di_mode)) {
			error = xfs_dir_replace(tp, ip2, &xfs_name_dotdot,
						dp1->i_ino, first_block,
						free_list, spaceres);
			if (error)
2794
				goto out_trans_abort;
2795 2796 2797 2798 2799

			/* transfer ip2 ".." reference to dp1 */
			if (!S_ISDIR(ip1->i_d.di_mode)) {
				error = xfs_droplink(tp, dp2);
				if (error)
2800
					goto out_trans_abort;
2801 2802
				error = xfs_bumplink(tp, dp1);
				if (error)
2803
					goto out_trans_abort;
2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820
			}

			/*
			 * Although ip1 isn't changed here, userspace needs
			 * to be warned about the change, so that applications
			 * relying on it (like backup ones), will properly
			 * notify the change
			 */
			ip1_flags |= XFS_ICHGTIME_CHG;
			ip2_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
		}

		if (S_ISDIR(ip1->i_d.di_mode)) {
			error = xfs_dir_replace(tp, ip1, &xfs_name_dotdot,
						dp2->i_ino, first_block,
						free_list, spaceres);
			if (error)
2821
				goto out_trans_abort;
2822 2823 2824 2825 2826

			/* transfer ip1 ".." reference to dp2 */
			if (!S_ISDIR(ip2->i_d.di_mode)) {
				error = xfs_droplink(tp, dp1);
				if (error)
2827
					goto out_trans_abort;
2828 2829
				error = xfs_bumplink(tp, dp2);
				if (error)
2830
					goto out_trans_abort;
2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857
			}

			/*
			 * Although ip2 isn't changed here, userspace needs
			 * to be warned about the change, so that applications
			 * relying on it (like backup ones), will properly
			 * notify the change
			 */
			ip1_flags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
			ip2_flags |= XFS_ICHGTIME_CHG;
		}
	}

	if (ip1_flags) {
		xfs_trans_ichgtime(tp, ip1, ip1_flags);
		xfs_trans_log_inode(tp, ip1, XFS_ILOG_CORE);
	}
	if (ip2_flags) {
		xfs_trans_ichgtime(tp, ip2, ip2_flags);
		xfs_trans_log_inode(tp, ip2, XFS_ILOG_CORE);
	}
	if (dp2_flags) {
		xfs_trans_ichgtime(tp, dp2, dp2_flags);
		xfs_trans_log_inode(tp, dp2, XFS_ILOG_CORE);
	}
	xfs_trans_ichgtime(tp, dp1, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
	xfs_trans_log_inode(tp, dp1, XFS_ILOG_CORE);
2858 2859 2860 2861 2862
	return xfs_finish_rename(tp, free_list);

out_trans_abort:
	xfs_bmap_cancel(free_list);
	xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
2863 2864 2865
	return error;
}

D
Dave Chinner 已提交
2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893
/*
 * xfs_rename_alloc_whiteout()
 *
 * Return a referenced, unlinked, unlocked inode that that can be used as a
 * whiteout in a rename transaction. We use a tmpfile inode here so that if we
 * crash between allocating the inode and linking it into the rename transaction
 * recovery will free the inode and we won't leak it.
 */
static int
xfs_rename_alloc_whiteout(
	struct xfs_inode	*dp,
	struct xfs_inode	**wip)
{
	struct xfs_inode	*tmpfile;
	int			error;

	error = xfs_create_tmpfile(dp, NULL, S_IFCHR | WHITEOUT_MODE, &tmpfile);
	if (error)
		return error;

	/* Satisfy xfs_bumplink that this is a real tmpfile */
	xfs_finish_inode_setup(tmpfile);
	VFS_I(tmpfile)->i_state |= I_LINKABLE;

	*wip = tmpfile;
	return 0;
}

D
Dave Chinner 已提交
2894 2895 2896 2897 2898
/*
 * xfs_rename
 */
int
xfs_rename(
D
Dave Chinner 已提交
2899 2900 2901 2902 2903 2904 2905
	struct xfs_inode	*src_dp,
	struct xfs_name		*src_name,
	struct xfs_inode	*src_ip,
	struct xfs_inode	*target_dp,
	struct xfs_name		*target_name,
	struct xfs_inode	*target_ip,
	unsigned int		flags)
D
Dave Chinner 已提交
2906
{
D
Dave Chinner 已提交
2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918
	struct xfs_mount	*mp = src_dp->i_mount;
	struct xfs_trans	*tp;
	struct xfs_bmap_free	free_list;
	xfs_fsblock_t		first_block;
	struct xfs_inode	*wip = NULL;		/* whiteout inode */
	struct xfs_inode	*inodes[__XFS_SORT_INODES];
	int			num_inodes = __XFS_SORT_INODES;
	int			new_parent = (src_dp != target_dp);
	int			src_is_directory = S_ISDIR(src_ip->i_d.di_mode);
	int			cancel_flags = 0;
	int			spaceres;
	int			error;
D
Dave Chinner 已提交
2919 2920 2921

	trace_xfs_rename(src_dp, target_dp, src_name, target_name);

2922 2923 2924
	if ((flags & RENAME_EXCHANGE) && !target_ip)
		return -EINVAL;

D
Dave Chinner 已提交
2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938
	/*
	 * If we are doing a whiteout operation, allocate the whiteout inode
	 * we will be placing at the target and ensure the type is set
	 * appropriately.
	 */
	if (flags & RENAME_WHITEOUT) {
		ASSERT(!(flags & (RENAME_NOREPLACE | RENAME_EXCHANGE)));
		error = xfs_rename_alloc_whiteout(target_dp, &wip);
		if (error)
			return error;

		/* setup target dirent info as whiteout */
		src_name->type = XFS_DIR3_FT_CHRDEV;
	}
D
Dave Chinner 已提交
2939

D
Dave Chinner 已提交
2940
	xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip, wip,
D
Dave Chinner 已提交
2941 2942 2943 2944
				inodes, &num_inodes);

	tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME);
	spaceres = XFS_RENAME_SPACE_RES(mp, target_name->len);
2945
	error = xfs_trans_reserve(tp, &M_RES(mp)->tr_rename, spaceres, 0);
D
Dave Chinner 已提交
2946
	if (error == -ENOSPC) {
D
Dave Chinner 已提交
2947
		spaceres = 0;
2948
		error = xfs_trans_reserve(tp, &M_RES(mp)->tr_rename, 0, 0);
D
Dave Chinner 已提交
2949
	}
2950 2951 2952
	if (error)
		goto out_trans_cancel;
	cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
D
Dave Chinner 已提交
2953 2954 2955 2956 2957

	/*
	 * Attach the dquots to the inodes
	 */
	error = xfs_qm_vop_rename_dqattach(inodes);
2958 2959
	if (error)
		goto out_trans_cancel;
D
Dave Chinner 已提交
2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979

	/*
	 * Lock all the participating inodes. Depending upon whether
	 * the target_name exists in the target directory, and
	 * whether the target directory is the same as the source
	 * directory, we can lock from 2 to 4 inodes.
	 */
	xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);

	/*
	 * Join all the inodes to the transaction. From this point on,
	 * we can rely on either trans_commit or trans_cancel to unlock
	 * them.
	 */
	xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
	if (new_parent)
		xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
	xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
	if (target_ip)
		xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
D
Dave Chinner 已提交
2980 2981
	if (wip)
		xfs_trans_ijoin(tp, wip, XFS_ILOCK_EXCL);
D
Dave Chinner 已提交
2982 2983 2984 2985 2986 2987 2988 2989

	/*
	 * If we are using project inheritance, we only allow renames
	 * into our tree when the project IDs are the same; else the
	 * tree quota mechanism would be circumvented.
	 */
	if (unlikely((target_dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
		     (xfs_get_projid(target_dp) != xfs_get_projid(src_ip)))) {
D
Dave Chinner 已提交
2990
		error = -EXDEV;
2991
		goto out_trans_cancel;
D
Dave Chinner 已提交
2992 2993
	}

2994 2995
	xfs_bmap_init(&free_list, &first_block);

2996 2997 2998 2999 3000
	/* RENAME_EXCHANGE is unique from here on. */
	if (flags & RENAME_EXCHANGE)
		return xfs_cross_rename(tp, src_dp, src_name, src_ip,
					target_dp, target_name, target_ip,
					&free_list, &first_block, spaceres);
3001

D
Dave Chinner 已提交
3002 3003 3004 3005 3006 3007 3008 3009
	/*
	 * Set up the target.
	 */
	if (target_ip == NULL) {
		/*
		 * If there's no space reservation, check the entry will
		 * fit before actually inserting it.
		 */
3010 3011 3012
		if (!spaceres) {
			error = xfs_dir_canenter(tp, target_dp, target_name);
			if (error)
3013
				goto out_trans_cancel;
3014
		}
D
Dave Chinner 已提交
3015 3016 3017 3018 3019 3020 3021 3022
		/*
		 * If target does not exist and the rename crosses
		 * directories, adjust the target directory link count
		 * to account for the ".." reference from the new entry.
		 */
		error = xfs_dir_createname(tp, target_dp, target_name,
						src_ip->i_ino, &first_block,
						&free_list, spaceres);
D
Dave Chinner 已提交
3023
		if (error == -ENOSPC)
3024
			goto out_bmap_cancel;
D
Dave Chinner 已提交
3025
		if (error)
3026
			goto out_trans_abort;
D
Dave Chinner 已提交
3027 3028 3029 3030 3031 3032 3033

		xfs_trans_ichgtime(tp, target_dp,
					XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);

		if (new_parent && src_is_directory) {
			error = xfs_bumplink(tp, target_dp);
			if (error)
3034
				goto out_trans_abort;
D
Dave Chinner 已提交
3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047
		}
	} else { /* target_ip != NULL */
		/*
		 * If target exists and it's a directory, check that both
		 * target and source are directories and that target can be
		 * destroyed, or that neither is a directory.
		 */
		if (S_ISDIR(target_ip->i_d.di_mode)) {
			/*
			 * Make sure target dir is empty.
			 */
			if (!(xfs_dir_isempty(target_ip)) ||
			    (target_ip->i_d.di_nlink > 2)) {
D
Dave Chinner 已提交
3048
				error = -EEXIST;
3049
				goto out_trans_cancel;
D
Dave Chinner 已提交
3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065
			}
		}

		/*
		 * Link the source inode under the target name.
		 * If the source inode is a directory and we are moving
		 * it across directories, its ".." entry will be
		 * inconsistent until we replace that down below.
		 *
		 * In case there is already an entry with the same
		 * name at the destination directory, remove it first.
		 */
		error = xfs_dir_replace(tp, target_dp, target_name,
					src_ip->i_ino,
					&first_block, &free_list, spaceres);
		if (error)
3066
			goto out_trans_abort;
D
Dave Chinner 已提交
3067 3068 3069 3070 3071 3072 3073 3074 3075 3076

		xfs_trans_ichgtime(tp, target_dp,
					XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);

		/*
		 * Decrement the link count on the target since the target
		 * dir no longer points to it.
		 */
		error = xfs_droplink(tp, target_ip);
		if (error)
3077
			goto out_trans_abort;
D
Dave Chinner 已提交
3078 3079 3080 3081 3082 3083 3084

		if (src_is_directory) {
			/*
			 * Drop the link from the old "." entry.
			 */
			error = xfs_droplink(tp, target_ip);
			if (error)
3085
				goto out_trans_abort;
D
Dave Chinner 已提交
3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099
		}
	} /* target_ip != NULL */

	/*
	 * Remove the source.
	 */
	if (new_parent && src_is_directory) {
		/*
		 * Rewrite the ".." entry to point to the new
		 * directory.
		 */
		error = xfs_dir_replace(tp, src_ip, &xfs_name_dotdot,
					target_dp->i_ino,
					&first_block, &free_list, spaceres);
D
Dave Chinner 已提交
3100
		ASSERT(error != -EEXIST);
D
Dave Chinner 已提交
3101
		if (error)
3102
			goto out_trans_abort;
D
Dave Chinner 已提交
3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127
	}

	/*
	 * We always want to hit the ctime on the source inode.
	 *
	 * This isn't strictly required by the standards since the source
	 * inode isn't really being changed, but old unix file systems did
	 * it and some incremental backup programs won't work without it.
	 */
	xfs_trans_ichgtime(tp, src_ip, XFS_ICHGTIME_CHG);
	xfs_trans_log_inode(tp, src_ip, XFS_ILOG_CORE);

	/*
	 * Adjust the link count on src_dp.  This is necessary when
	 * renaming a directory, either within one parent when
	 * the target existed, or across two parent directories.
	 */
	if (src_is_directory && (new_parent || target_ip != NULL)) {

		/*
		 * Decrement link count on src_directory since the
		 * entry that's moved no longer points to it.
		 */
		error = xfs_droplink(tp, src_dp);
		if (error)
3128
			goto out_trans_abort;
D
Dave Chinner 已提交
3129 3130
	}

D
Dave Chinner 已提交
3131 3132 3133 3134 3135 3136 3137
	/*
	 * For whiteouts, we only need to update the source dirent with the
	 * inode number of the whiteout inode rather than removing it
	 * altogether.
	 */
	if (wip) {
		error = xfs_dir_replace(tp, src_dp, src_name, wip->i_ino,
D
Dave Chinner 已提交
3138
					&first_block, &free_list, spaceres);
D
Dave Chinner 已提交
3139 3140 3141
	} else
		error = xfs_dir_removename(tp, src_dp, src_name, src_ip->i_ino,
					   &first_block, &free_list, spaceres);
D
Dave Chinner 已提交
3142
	if (error)
3143
		goto out_trans_abort;
D
Dave Chinner 已提交
3144 3145

	/*
D
Dave Chinner 已提交
3146 3147 3148 3149 3150 3151
	 * For whiteouts, we need to bump the link count on the whiteout inode.
	 * This means that failures all the way up to this point leave the inode
	 * on the unlinked list and so cleanup is a simple matter of dropping
	 * the remaining reference to it. If we fail here after bumping the link
	 * count, we're shutting down the filesystem so we'll never see the
	 * intermediate state on disk.
D
Dave Chinner 已提交
3152
	 */
D
Dave Chinner 已提交
3153 3154 3155 3156 3157 3158 3159 3160 3161
	if (wip) {
		ASSERT(wip->i_d.di_nlink == 0);
		error = xfs_bumplink(tp, wip);
		if (error)
			goto out_trans_abort;
		error = xfs_iunlink_remove(tp, wip);
		if (error)
			goto out_trans_abort;
		xfs_trans_log_inode(tp, wip, XFS_ILOG_CORE);
D
Dave Chinner 已提交
3162

D
Dave Chinner 已提交
3163 3164 3165 3166 3167 3168
		/*
		 * Now we have a real link, clear the "I'm a tmpfile" state
		 * flag from the inode so it doesn't accidentally get misused in
		 * future.
		 */
		VFS_I(wip)->i_state &= ~I_LINKABLE;
D
Dave Chinner 已提交
3169 3170 3171 3172 3173 3174 3175
	}

	xfs_trans_ichgtime(tp, src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
	xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE);
	if (new_parent)
		xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE);

D
Dave Chinner 已提交
3176 3177 3178 3179
	error = xfs_finish_rename(tp, &free_list);
	if (wip)
		IRELE(wip);
	return error;
D
Dave Chinner 已提交
3180

3181
out_trans_abort:
D
Dave Chinner 已提交
3182
	cancel_flags |= XFS_TRANS_ABORT;
3183
out_bmap_cancel:
D
Dave Chinner 已提交
3184
	xfs_bmap_cancel(&free_list);
3185
out_trans_cancel:
D
Dave Chinner 已提交
3186
	xfs_trans_cancel(tp, cancel_flags);
D
Dave Chinner 已提交
3187 3188
	if (wip)
		IRELE(wip);
D
Dave Chinner 已提交
3189 3190 3191
	return error;
}

3192 3193 3194 3195
STATIC int
xfs_iflush_cluster(
	xfs_inode_t	*ip,
	xfs_buf_t	*bp)
L
Linus Torvalds 已提交
3196
{
3197 3198 3199 3200 3201 3202 3203 3204 3205 3206
	xfs_mount_t		*mp = ip->i_mount;
	struct xfs_perag	*pag;
	unsigned long		first_index, mask;
	unsigned long		inodes_per_cluster;
	int			ilist_size;
	xfs_inode_t		**ilist;
	xfs_inode_t		*iq;
	int			nr_found;
	int			clcount = 0;
	int			bufwasdelwri;
L
Linus Torvalds 已提交
3207 3208
	int			i;

3209
	pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
L
Linus Torvalds 已提交
3210

3211
	inodes_per_cluster = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
3212 3213 3214 3215
	ilist_size = inodes_per_cluster * sizeof(xfs_inode_t *);
	ilist = kmem_alloc(ilist_size, KM_MAYFAIL|KM_NOFS);
	if (!ilist)
		goto out_put;
L
Linus Torvalds 已提交
3216

3217
	mask = ~(((mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog)) - 1);
3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228
	first_index = XFS_INO_TO_AGINO(mp, ip->i_ino) & mask;
	rcu_read_lock();
	/* really need a gang lookup range call here */
	nr_found = radix_tree_gang_lookup(&pag->pag_ici_root, (void**)ilist,
					first_index, inodes_per_cluster);
	if (nr_found == 0)
		goto out_free;

	for (i = 0; i < nr_found; i++) {
		iq = ilist[i];
		if (iq == ip)
3229
			continue;
3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244

		/*
		 * because this is an RCU protected lookup, we could find a
		 * recently freed or even reallocated inode during the lookup.
		 * We need to check under the i_flags_lock for a valid inode
		 * here. Skip it if it is not valid or the wrong inode.
		 */
		spin_lock(&ip->i_flags_lock);
		if (!ip->i_ino ||
		    (XFS_INO_TO_AGINO(mp, iq->i_ino) & mask) != first_index) {
			spin_unlock(&ip->i_flags_lock);
			continue;
		}
		spin_unlock(&ip->i_flags_lock);

3245 3246 3247 3248 3249
		/*
		 * Do an un-protected check to see if the inode is dirty and
		 * is a candidate for flushing.  These checks will be repeated
		 * later after the appropriate locks are acquired.
		 */
3250
		if (xfs_inode_clean(iq) && xfs_ipincount(iq) == 0)
3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273
			continue;

		/*
		 * Try to get locks.  If any are unavailable or it is pinned,
		 * then this inode cannot be flushed and is skipped.
		 */

		if (!xfs_ilock_nowait(iq, XFS_ILOCK_SHARED))
			continue;
		if (!xfs_iflock_nowait(iq)) {
			xfs_iunlock(iq, XFS_ILOCK_SHARED);
			continue;
		}
		if (xfs_ipincount(iq)) {
			xfs_ifunlock(iq);
			xfs_iunlock(iq, XFS_ILOCK_SHARED);
			continue;
		}

		/*
		 * arriving here means that this inode can be flushed.  First
		 * re-check that it's dirty before flushing.
		 */
3274 3275
		if (!xfs_inode_clean(iq)) {
			int	error;
3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293
			error = xfs_iflush_int(iq, bp);
			if (error) {
				xfs_iunlock(iq, XFS_ILOCK_SHARED);
				goto cluster_corrupt_out;
			}
			clcount++;
		} else {
			xfs_ifunlock(iq);
		}
		xfs_iunlock(iq, XFS_ILOCK_SHARED);
	}

	if (clcount) {
		XFS_STATS_INC(xs_icluster_flushcnt);
		XFS_STATS_ADD(xs_icluster_flushinode, clcount);
	}

out_free:
3294
	rcu_read_unlock();
3295
	kmem_free(ilist);
3296 3297
out_put:
	xfs_perag_put(pag);
3298 3299 3300 3301 3302 3303 3304 3305
	return 0;


cluster_corrupt_out:
	/*
	 * Corruption detected in the clustering loop.  Invalidate the
	 * inode buffer and shut down the filesystem.
	 */
3306
	rcu_read_unlock();
3307
	/*
3308
	 * Clean up the buffer.  If it was delwri, just release it --
3309 3310 3311
	 * brelse can handle it with no problems.  If not, shut down the
	 * filesystem before releasing the buffer.
	 */
3312
	bufwasdelwri = (bp->b_flags & _XBF_DELWRI_Q);
3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323
	if (bufwasdelwri)
		xfs_buf_relse(bp);

	xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);

	if (!bufwasdelwri) {
		/*
		 * Just like incore_relse: if we have b_iodone functions,
		 * mark the buffer as an error and call them.  Otherwise
		 * mark it as stale and brelse.
		 */
3324
		if (bp->b_iodone) {
3325
			XFS_BUF_UNDONE(bp);
3326
			xfs_buf_stale(bp);
D
Dave Chinner 已提交
3327
			xfs_buf_ioerror(bp, -EIO);
3328
			xfs_buf_ioend(bp);
3329
		} else {
3330
			xfs_buf_stale(bp);
3331 3332 3333 3334 3335 3336 3337
			xfs_buf_relse(bp);
		}
	}

	/*
	 * Unlocks the flush lock
	 */
3338
	xfs_iflush_abort(iq, false);
3339
	kmem_free(ilist);
3340
	xfs_perag_put(pag);
D
Dave Chinner 已提交
3341
	return -EFSCORRUPTED;
3342 3343
}

L
Linus Torvalds 已提交
3344
/*
3345 3346 3347 3348 3349 3350 3351
 * Flush dirty inode metadata into the backing buffer.
 *
 * The caller must have the inode lock and the inode flush lock held.  The
 * inode lock will still be held upon return to the caller, and the inode
 * flush lock will be released after the inode has reached the disk.
 *
 * The caller must write out the buffer returned in *bpp and release it.
L
Linus Torvalds 已提交
3352 3353 3354
 */
int
xfs_iflush(
3355 3356
	struct xfs_inode	*ip,
	struct xfs_buf		**bpp)
L
Linus Torvalds 已提交
3357
{
3358 3359 3360
	struct xfs_mount	*mp = ip->i_mount;
	struct xfs_buf		*bp;
	struct xfs_dinode	*dip;
L
Linus Torvalds 已提交
3361 3362 3363 3364
	int			error;

	XFS_STATS_INC(xs_iflush_count);

C
Christoph Hellwig 已提交
3365
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
3366
	ASSERT(xfs_isiflocked(ip));
L
Linus Torvalds 已提交
3367
	ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
3368
	       ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK));
L
Linus Torvalds 已提交
3369

3370
	*bpp = NULL;
L
Linus Torvalds 已提交
3371 3372 3373

	xfs_iunpin_wait(ip);

3374 3375 3376
	/*
	 * For stale inodes we cannot rely on the backing buffer remaining
	 * stale in cache for the remaining life of the stale inode and so
3377
	 * xfs_imap_to_bp() below may give us a buffer that no longer contains
3378 3379 3380 3381 3382 3383 3384 3385 3386
	 * inodes below. We have to check this after ensuring the inode is
	 * unpinned so that it is safe to reclaim the stale inode after the
	 * flush call.
	 */
	if (xfs_iflags_test(ip, XFS_ISTALE)) {
		xfs_ifunlock(ip);
		return 0;
	}

L
Linus Torvalds 已提交
3387 3388 3389
	/*
	 * This may have been unpinned because the filesystem is shutting
	 * down forcibly. If that's the case we must not write this inode
3390 3391 3392 3393
	 * to disk, because the log record didn't make it to disk.
	 *
	 * We also have to remove the log item from the AIL in this case,
	 * as we wait for an empty AIL as part of the unmount process.
L
Linus Torvalds 已提交
3394 3395
	 */
	if (XFS_FORCED_SHUTDOWN(mp)) {
D
Dave Chinner 已提交
3396
		error = -EIO;
3397
		goto abort_out;
L
Linus Torvalds 已提交
3398 3399
	}

3400 3401 3402
	/*
	 * Get the buffer containing the on-disk inode.
	 */
3403 3404
	error = xfs_imap_to_bp(mp, NULL, &ip->i_imap, &dip, &bp, XBF_TRYLOCK,
			       0);
3405 3406 3407 3408 3409
	if (error || !bp) {
		xfs_ifunlock(ip);
		return error;
	}

L
Linus Torvalds 已提交
3410 3411 3412 3413
	/*
	 * First flush out the inode that xfs_iflush was called with.
	 */
	error = xfs_iflush_int(ip, bp);
3414
	if (error)
L
Linus Torvalds 已提交
3415 3416
		goto corrupt_out;

3417 3418 3419 3420
	/*
	 * If the buffer is pinned then push on the log now so we won't
	 * get stuck waiting in the write for too long.
	 */
3421
	if (xfs_buf_ispinned(bp))
3422
		xfs_log_force(mp, 0);
3423

L
Linus Torvalds 已提交
3424 3425 3426 3427
	/*
	 * inode clustering:
	 * see if other inodes can be gathered into this write
	 */
3428 3429 3430
	error = xfs_iflush_cluster(ip, bp);
	if (error)
		goto cluster_corrupt_out;
L
Linus Torvalds 已提交
3431

3432 3433
	*bpp = bp;
	return 0;
L
Linus Torvalds 已提交
3434 3435 3436

corrupt_out:
	xfs_buf_relse(bp);
3437
	xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
L
Linus Torvalds 已提交
3438
cluster_corrupt_out:
D
Dave Chinner 已提交
3439
	error = -EFSCORRUPTED;
3440
abort_out:
L
Linus Torvalds 已提交
3441 3442 3443
	/*
	 * Unlocks the flush lock
	 */
3444
	xfs_iflush_abort(ip, false);
3445
	return error;
L
Linus Torvalds 已提交
3446 3447 3448 3449
}

STATIC int
xfs_iflush_int(
3450 3451
	struct xfs_inode	*ip,
	struct xfs_buf		*bp)
L
Linus Torvalds 已提交
3452
{
3453 3454 3455
	struct xfs_inode_log_item *iip = ip->i_itemp;
	struct xfs_dinode	*dip;
	struct xfs_mount	*mp = ip->i_mount;
L
Linus Torvalds 已提交
3456

C
Christoph Hellwig 已提交
3457
	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
3458
	ASSERT(xfs_isiflocked(ip));
L
Linus Torvalds 已提交
3459
	ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
3460
	       ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK));
3461
	ASSERT(iip != NULL && iip->ili_fields != 0);
3462
	ASSERT(ip->i_d.di_version > 1);
L
Linus Torvalds 已提交
3463 3464

	/* set *dip = inode's place in the buffer */
3465
	dip = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_imap.im_boffset);
L
Linus Torvalds 已提交
3466

3467
	if (XFS_TEST_ERROR(dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC),
L
Linus Torvalds 已提交
3468
			       mp, XFS_ERRTAG_IFLUSH_1, XFS_RANDOM_IFLUSH_1)) {
3469 3470 3471
		xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
			"%s: Bad inode %Lu magic number 0x%x, ptr 0x%p",
			__func__, ip->i_ino, be16_to_cpu(dip->di_magic), dip);
L
Linus Torvalds 已提交
3472 3473 3474 3475
		goto corrupt_out;
	}
	if (XFS_TEST_ERROR(ip->i_d.di_magic != XFS_DINODE_MAGIC,
				mp, XFS_ERRTAG_IFLUSH_2, XFS_RANDOM_IFLUSH_2)) {
3476 3477 3478
		xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
			"%s: Bad inode %Lu, ptr 0x%p, magic number 0x%x",
			__func__, ip->i_ino, ip, ip->i_d.di_magic);
L
Linus Torvalds 已提交
3479 3480
		goto corrupt_out;
	}
3481
	if (S_ISREG(ip->i_d.di_mode)) {
L
Linus Torvalds 已提交
3482 3483 3484 3485
		if (XFS_TEST_ERROR(
		    (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) &&
		    (ip->i_d.di_format != XFS_DINODE_FMT_BTREE),
		    mp, XFS_ERRTAG_IFLUSH_3, XFS_RANDOM_IFLUSH_3)) {
3486 3487 3488
			xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
				"%s: Bad regular inode %Lu, ptr 0x%p",
				__func__, ip->i_ino, ip);
L
Linus Torvalds 已提交
3489 3490
			goto corrupt_out;
		}
3491
	} else if (S_ISDIR(ip->i_d.di_mode)) {
L
Linus Torvalds 已提交
3492 3493 3494 3495 3496
		if (XFS_TEST_ERROR(
		    (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) &&
		    (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
		    (ip->i_d.di_format != XFS_DINODE_FMT_LOCAL),
		    mp, XFS_ERRTAG_IFLUSH_4, XFS_RANDOM_IFLUSH_4)) {
3497 3498 3499
			xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
				"%s: Bad directory inode %Lu, ptr 0x%p",
				__func__, ip->i_ino, ip);
L
Linus Torvalds 已提交
3500 3501 3502 3503 3504 3505
			goto corrupt_out;
		}
	}
	if (XFS_TEST_ERROR(ip->i_d.di_nextents + ip->i_d.di_anextents >
				ip->i_d.di_nblocks, mp, XFS_ERRTAG_IFLUSH_5,
				XFS_RANDOM_IFLUSH_5)) {
3506 3507 3508 3509
		xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
			"%s: detected corrupt incore inode %Lu, "
			"total extents = %d, nblocks = %Ld, ptr 0x%p",
			__func__, ip->i_ino,
L
Linus Torvalds 已提交
3510
			ip->i_d.di_nextents + ip->i_d.di_anextents,
3511
			ip->i_d.di_nblocks, ip);
L
Linus Torvalds 已提交
3512 3513 3514 3515
		goto corrupt_out;
	}
	if (XFS_TEST_ERROR(ip->i_d.di_forkoff > mp->m_sb.sb_inodesize,
				mp, XFS_ERRTAG_IFLUSH_6, XFS_RANDOM_IFLUSH_6)) {
3516 3517 3518
		xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
			"%s: bad inode %Lu, forkoff 0x%x, ptr 0x%p",
			__func__, ip->i_ino, ip->i_d.di_forkoff, ip);
L
Linus Torvalds 已提交
3519 3520
		goto corrupt_out;
	}
3521

L
Linus Torvalds 已提交
3522
	/*
3523
	 * Inode item log recovery for v2 inodes are dependent on the
3524 3525 3526 3527 3528 3529
	 * di_flushiter count for correct sequencing. We bump the flush
	 * iteration count so we can detect flushes which postdate a log record
	 * during recovery. This is redundant as we now log every change and
	 * hence this can't happen but we need to still do it to ensure
	 * backwards compatibility with old kernels that predate logging all
	 * inode changes.
L
Linus Torvalds 已提交
3530
	 */
3531 3532
	if (ip->i_d.di_version < 3)
		ip->i_d.di_flushiter++;
L
Linus Torvalds 已提交
3533 3534 3535 3536 3537 3538 3539

	/*
	 * Copy the dirty parts of the inode into the on-disk
	 * inode.  We always copy out the core of the inode,
	 * because if the inode is dirty at all the core must
	 * be.
	 */
C
Christoph Hellwig 已提交
3540
	xfs_dinode_to_disk(dip, &ip->i_d);
L
Linus Torvalds 已提交
3541 3542 3543 3544 3545

	/* Wrap, we never let the log put out DI_MAX_FLUSH */
	if (ip->i_d.di_flushiter == DI_MAX_FLUSH)
		ip->i_d.di_flushiter = 0;

3546
	xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK);
3547
	if (XFS_IFORK_Q(ip))
3548
		xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK);
L
Linus Torvalds 已提交
3549 3550 3551
	xfs_inobp_check(mp, bp);

	/*
3552 3553 3554 3555 3556 3557 3558
	 * We've recorded everything logged in the inode, so we'd like to clear
	 * the ili_fields bits so we don't log and flush things unnecessarily.
	 * However, we can't stop logging all this information until the data
	 * we've copied into the disk buffer is written to disk.  If we did we
	 * might overwrite the copy of the inode in the log with all the data
	 * after re-logging only part of it, and in the face of a crash we
	 * wouldn't have all the data we need to recover.
L
Linus Torvalds 已提交
3559
	 *
3560 3561 3562 3563 3564 3565
	 * What we do is move the bits to the ili_last_fields field.  When
	 * logging the inode, these bits are moved back to the ili_fields field.
	 * In the xfs_iflush_done() routine we clear ili_last_fields, since we
	 * know that the information those bits represent is permanently on
	 * disk.  As long as the flush completes before the inode is logged
	 * again, then both ili_fields and ili_last_fields will be cleared.
L
Linus Torvalds 已提交
3566
	 *
3567 3568 3569 3570 3571 3572 3573 3574
	 * We can play with the ili_fields bits here, because the inode lock
	 * must be held exclusively in order to set bits there and the flush
	 * lock protects the ili_last_fields bits.  Set ili_logged so the flush
	 * done routine can tell whether or not to look in the AIL.  Also, store
	 * the current LSN of the inode so that we can tell whether the item has
	 * moved in the AIL from xfs_iflush_done().  In order to read the lsn we
	 * need the AIL lock, because it is a 64 bit value that cannot be read
	 * atomically.
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Linus Torvalds 已提交
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	 */
3576 3577 3578
	iip->ili_last_fields = iip->ili_fields;
	iip->ili_fields = 0;
	iip->ili_logged = 1;
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Linus Torvalds 已提交
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3580 3581
	xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
				&iip->ili_item.li_lsn);
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Linus Torvalds 已提交
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3583 3584 3585 3586 3587 3588 3589
	/*
	 * Attach the function xfs_iflush_done to the inode's
	 * buffer.  This will remove the inode from the AIL
	 * and unlock the inode's flush lock when the inode is
	 * completely written to disk.
	 */
	xfs_buf_attach_iodone(bp, xfs_iflush_done, &iip->ili_item);
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Linus Torvalds 已提交
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3591 3592 3593 3594 3595 3596
	/* update the lsn in the on disk inode if required */
	if (ip->i_d.di_version == 3)
		dip->di_lsn = cpu_to_be64(iip->ili_item.li_lsn);

	/* generate the checksum. */
	xfs_dinode_calc_crc(mp, dip);
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3598 3599
	ASSERT(bp->b_fspriv != NULL);
	ASSERT(bp->b_iodone != NULL);
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3600 3601 3602
	return 0;

corrupt_out:
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Dave Chinner 已提交
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	return -EFSCORRUPTED;
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Linus Torvalds 已提交
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}