inode.c 48.3 KB
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/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
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 * Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
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 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
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 * of the GNU General Public License version 2.
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 */

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/namei.h>
#include <linux/mm.h>
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#include <linux/cred.h>
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#include <linux/xattr.h>
#include <linux/posix_acl.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/crc32.h>
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#include <linux/fiemap.h>
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#include <linux/security.h>
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#include <linux/uaccess.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "acl.h"
#include "bmap.h"
#include "dir.h"
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#include "xattr.h"
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#include "glock.h"
#include "inode.h"
#include "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
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#include "util.h"
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#include "super.h"
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#include "glops.h"

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static int iget_test(struct inode *inode, void *opaque)
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{
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	u64 no_addr = *(u64 *)opaque;

	return GFS2_I(inode)->i_no_addr == no_addr;
}

static int iget_set(struct inode *inode, void *opaque)
{
	u64 no_addr = *(u64 *)opaque;

	GFS2_I(inode)->i_no_addr = no_addr;
	inode->i_ino = no_addr;
	return 0;
}

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static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
{
	struct inode *inode;

repeat:
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	inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
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	if (!inode)
		return inode;
	if (is_bad_inode(inode)) {
		iput(inode);
		goto repeat;
	}
	return inode;
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}

/**
 * gfs2_set_iop - Sets inode operations
 * @inode: The inode with correct i_mode filled in
 *
 * GFS2 lookup code fills in vfs inode contents based on info obtained
 * from directory entry inside gfs2_inode_lookup().
 */

static void gfs2_set_iop(struct inode *inode)
{
	struct gfs2_sbd *sdp = GFS2_SB(inode);
	umode_t mode = inode->i_mode;

	if (S_ISREG(mode)) {
		inode->i_op = &gfs2_file_iops;
		if (gfs2_localflocks(sdp))
			inode->i_fop = &gfs2_file_fops_nolock;
		else
			inode->i_fop = &gfs2_file_fops;
	} else if (S_ISDIR(mode)) {
		inode->i_op = &gfs2_dir_iops;
		if (gfs2_localflocks(sdp))
			inode->i_fop = &gfs2_dir_fops_nolock;
		else
			inode->i_fop = &gfs2_dir_fops;
	} else if (S_ISLNK(mode)) {
		inode->i_op = &gfs2_symlink_iops;
	} else {
		inode->i_op = &gfs2_file_iops;
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
	}
}

/**
 * gfs2_inode_lookup - Lookup an inode
 * @sb: The super block
 * @type: The type of the inode
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 * @no_addr: The inode number
 * @no_formal_ino: The inode generation number
 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
 *           GFS2_BLKST_FREE do indicate not to verify)
 *
 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
 *
 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
 * placeholder because it doesn't otherwise make sense), the on-disk block type
 * is verified to be @blktype.
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 *
 * Returns: A VFS inode, or an error
 */

struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
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				u64 no_addr, u64 no_formal_ino,
				unsigned int blktype)
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{
	struct inode *inode;
	struct gfs2_inode *ip;
	struct gfs2_glock *io_gl = NULL;
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	struct gfs2_holder i_gh;
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	int error;

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	gfs2_holder_mark_uninitialized(&i_gh);
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	inode = gfs2_iget(sb, no_addr);
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	if (!inode)
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		return ERR_PTR(-ENOMEM);
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	ip = GFS2_I(inode);

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	if (inode->i_state & I_NEW) {
		struct gfs2_sbd *sdp = GFS2_SB(inode);
		ip->i_no_formal_ino = no_formal_ino;

		error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
		if (unlikely(error))
			goto fail;
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		flush_delayed_work(&ip->i_gl->gl_work);
		glock_set_object(ip->i_gl, ip);
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		error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
		if (unlikely(error))
			goto fail_put;

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		if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
			/*
			 * The GL_SKIP flag indicates to skip reading the inode
			 * block.  We read the inode with gfs2_inode_refresh
			 * after possibly checking the block type.
			 */
			error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
						   GL_SKIP, &i_gh);
			if (error)
				goto fail_put;

			if (blktype != GFS2_BLKST_FREE) {
				error = gfs2_check_blk_type(sdp, no_addr,
							    blktype);
				if (error)
					goto fail_put;
			}
		}

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		set_bit(GIF_INVALID, &ip->i_flags);
		error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
		if (unlikely(error))
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			goto fail_put;
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		flush_delayed_work(&ip->i_iopen_gh.gh_gl->gl_work);
		glock_set_object(ip->i_iopen_gh.gh_gl, ip);
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		gfs2_glock_put(io_gl);
		io_gl = NULL;

		if (type == DT_UNKNOWN) {
			/* Inode glock must be locked already */
			error = gfs2_inode_refresh(GFS2_I(inode));
			if (error)
				goto fail_refresh;
		} else {
			inode->i_mode = DT2IF(type);
		}

		gfs2_set_iop(inode);
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		inode->i_atime.tv_sec = 0;
		inode->i_atime.tv_nsec = 0;

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		unlock_new_inode(inode);
	}

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	if (gfs2_holder_initialized(&i_gh))
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		gfs2_glock_dq_uninit(&i_gh);
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	return inode;

fail_refresh:
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	ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
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	glock_set_object(ip->i_iopen_gh.gh_gl, NULL);
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	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
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fail_put:
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	if (io_gl)
		gfs2_glock_put(io_gl);
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	if (gfs2_holder_initialized(&i_gh))
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		gfs2_glock_dq_uninit(&i_gh);
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	glock_set_object(ip->i_gl, NULL);
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fail:
	iget_failed(inode);
	return ERR_PTR(error);
}

struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
				  u64 *no_formal_ino, unsigned int blktype)
{
	struct super_block *sb = sdp->sd_vfs;
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	struct inode *inode;
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	int error;

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	inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, blktype);
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	if (IS_ERR(inode))
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		return inode;
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	/* Two extra checks for NFS only */
	if (no_formal_ino) {
		error = -ESTALE;
		if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
			goto fail_iput;

		error = -EIO;
		if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
			goto fail_iput;
	}
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	return inode;
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fail_iput:
	iput(inode);
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	return ERR_PTR(error);
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}


struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
{
	struct qstr qstr;
	struct inode *inode;
	gfs2_str2qstr(&qstr, name);
	inode = gfs2_lookupi(dip, &qstr, 1);
	/* gfs2_lookupi has inconsistent callers: vfs
	 * related routines expect NULL for no entry found,
	 * gfs2_lookup_simple callers expect ENOENT
	 * and do not check for NULL.
	 */
	if (inode == NULL)
		return ERR_PTR(-ENOENT);
	else
		return inode;
}


/**
 * gfs2_lookupi - Look up a filename in a directory and return its inode
 * @d_gh: An initialized holder for the directory glock
 * @name: The name of the inode to look for
 * @is_root: If 1, ignore the caller's permissions
 * @i_gh: An uninitialized holder for the new inode glock
 *
 * This can be called via the VFS filldir function when NFS is doing
 * a readdirplus and the inode which its intending to stat isn't
 * already in cache. In this case we must not take the directory glock
 * again, since the readdir call will have already taken that lock.
 *
 * Returns: errno
 */

struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
			   int is_root)
{
	struct super_block *sb = dir->i_sb;
	struct gfs2_inode *dip = GFS2_I(dir);
	struct gfs2_holder d_gh;
	int error = 0;
	struct inode *inode = NULL;

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	gfs2_holder_mark_uninitialized(&d_gh);
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	if (!name->len || name->len > GFS2_FNAMESIZE)
		return ERR_PTR(-ENAMETOOLONG);

	if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
	    (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
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	     dir == d_inode(sb->s_root))) {
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		igrab(dir);
		return dir;
	}

	if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
		error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
		if (error)
			return ERR_PTR(error);
	}

	if (!is_root) {
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		error = gfs2_permission(dir, MAY_EXEC);
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		if (error)
			goto out;
	}

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	inode = gfs2_dir_search(dir, name, false);
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	if (IS_ERR(inode))
		error = PTR_ERR(inode);
out:
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	if (gfs2_holder_initialized(&d_gh))
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		gfs2_glock_dq_uninit(&d_gh);
	if (error == -ENOENT)
		return NULL;
	return inode ? inode : ERR_PTR(error);
}

/**
 * create_ok - OK to create a new on-disk inode here?
 * @dip:  Directory in which dinode is to be created
 * @name:  Name of new dinode
 * @mode:
 *
 * Returns: errno
 */

static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
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		     umode_t mode)
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{
	int error;

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	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
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	if (error)
		return error;

	/*  Don't create entries in an unlinked directory  */
	if (!dip->i_inode.i_nlink)
		return -ENOENT;

	if (dip->i_entries == (u32)-1)
		return -EFBIG;
	if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
		return -EMLINK;

	return 0;
}

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static void munge_mode_uid_gid(const struct gfs2_inode *dip,
			       struct inode *inode)
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{
	if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
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	    (dip->i_inode.i_mode & S_ISUID) &&
	    !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
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		if (S_ISDIR(inode->i_mode))
			inode->i_mode |= S_ISUID;
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		else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
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			inode->i_mode &= ~07111;
		inode->i_uid = dip->i_inode.i_uid;
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	} else
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		inode->i_uid = current_fsuid();
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	if (dip->i_inode.i_mode & S_ISGID) {
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		if (S_ISDIR(inode->i_mode))
			inode->i_mode |= S_ISGID;
		inode->i_gid = dip->i_inode.i_gid;
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	} else
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		inode->i_gid = current_fsgid();
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}

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static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
376
{
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	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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	struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
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	int error;

381
	error = gfs2_quota_lock_check(ip, &ap);
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	if (error)
		goto out;

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	error = gfs2_inplace_reserve(ip, &ap);
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	if (error)
		goto out_quota;

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	error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
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	if (error)
		goto out_ipreserv;

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	error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
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	ip->i_no_formal_ino = ip->i_generation;
	ip->i_inode.i_ino = ip->i_no_addr;
	ip->i_goal = ip->i_no_addr;
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	gfs2_trans_end(sdp);

out_ipreserv:
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	gfs2_inplace_release(ip);
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out_quota:
	gfs2_quota_unlock(ip);
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out:
	return error;
}

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static void gfs2_init_dir(struct buffer_head *dibh,
			  const struct gfs2_inode *parent)
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{
	struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
	struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);

	gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
	dent->de_inum = di->di_num; /* already GFS2 endian */
	dent->de_type = cpu_to_be16(DT_DIR);

	dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
	gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
	gfs2_inum_out(parent, dent);
	dent->de_type = cpu_to_be16(DT_DIR);
	
}

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/**
 * gfs2_init_xattr - Initialise an xattr block for a new inode
 * @ip: The inode in question
 *
 * This sets up an empty xattr block for a new inode, ready to
 * take any ACLs, LSM xattrs, etc.
 */

static void gfs2_init_xattr(struct gfs2_inode *ip)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct buffer_head *bh;
	struct gfs2_ea_header *ea;

	bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
	gfs2_trans_add_meta(ip->i_gl, bh);
	gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
	gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));

	ea = GFS2_EA_BH2FIRST(bh);
	ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
	ea->ea_type = GFS2_EATYPE_UNUSED;
	ea->ea_flags = GFS2_EAFLAG_LAST;

	brelse(bh);
}

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/**
 * init_dinode - Fill in a new dinode structure
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 * @dip: The directory this inode is being created in
455
 * @ip: The inode
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 * @symname: The symlink destination (if a symlink)
 * @bhp: The buffer head (returned to caller)
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 *
 */

461
static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
462
			const char *symname)
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{
	struct gfs2_dinode *di;
	struct buffer_head *dibh;

467
	dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
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	gfs2_trans_add_meta(ip->i_gl, dibh);
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	di = (struct gfs2_dinode *)dibh->b_data;
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	gfs2_dinode_out(ip, di);
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	di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
	di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
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	di->__pad1 = 0;
	di->__pad2 = 0;
	di->__pad3 = 0;
	memset(&di->__pad4, 0, sizeof(di->__pad4));
	memset(&di->di_reserved, 0, sizeof(di->di_reserved));
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	gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
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481
	switch(ip->i_inode.i_mode & S_IFMT) {
482
	case S_IFDIR:
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		gfs2_init_dir(dibh, dip);
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		break;
	case S_IFLNK:
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		memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
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		break;
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	}

490
	set_buffer_uptodate(dibh);
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	brelse(dibh);
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}

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/**
 * gfs2_trans_da_blocks - Calculate number of blocks to link inode
 * @dip: The directory we are linking into
 * @da: The dir add information
 * @nr_inodes: The number of inodes involved
 *
 * This calculate the number of blocks we need to reserve in a
 * transaction to link @nr_inodes into a directory. In most cases
 * @nr_inodes will be 2 (the directory plus the inode being linked in)
 * but in case of rename, 4 may be required.
 *
 * Returns: Number of blocks
 */

static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
				   const struct gfs2_diradd *da,
				   unsigned nr_inodes)
{
	return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
	       (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
}

516
static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
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		       struct gfs2_inode *ip, struct gfs2_diradd *da)
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{
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
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	struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
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	int error;

523
	if (da->nr_blocks) {
524
		error = gfs2_quota_lock_check(dip, &ap);
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		if (error)
			goto fail_quota_locks;

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		error = gfs2_inplace_reserve(dip, &ap);
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		if (error)
			goto fail_quota_locks;

532
		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
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		if (error)
			goto fail_ipreserv;
	} else {
		error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
		if (error)
			goto fail_quota_locks;
	}

541
	error = gfs2_dir_add(&dip->i_inode, name, ip, da);
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	gfs2_trans_end(sdp);
fail_ipreserv:
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	gfs2_inplace_release(dip);
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fail_quota_locks:
	gfs2_quota_unlock(dip);
	return error;
}

551
static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
552
		    void *fs_info)
553
{
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	const struct xattr *xattr;
	int err = 0;

	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
		err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
				       xattr->value_len, 0,
				       GFS2_EATYPE_SECURITY);
		if (err < 0)
			break;
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	}
	return err;
}
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567
/**
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 * gfs2_create_inode - Create a new inode
 * @dir: The parent directory
 * @dentry: The new dentry
571
 * @file: If non-NULL, the file which is being opened
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 * @mode: The permissions on the new inode
 * @dev: For device nodes, this is the device number
 * @symname: For symlinks, this is the link destination
 * @size: The initial size of the inode (ignored for directories)
576
 *
577
 * Returns: 0 on success, or error code
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 */

580
static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
581
			     struct file *file,
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			     umode_t mode, dev_t dev, const char *symname,
583
			     unsigned int size, int excl, int *opened)
584
{
585
	const struct qstr *name = &dentry->d_name;
586
	struct posix_acl *default_acl, *acl;
587
	struct gfs2_holder ghs[2];
588
	struct inode *inode = NULL;
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Bob Peterson 已提交
589
	struct gfs2_inode *dip = GFS2_I(dir), *ip;
590
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
591
	struct gfs2_glock *io_gl = NULL;
592
	int error, free_vfs_inode = 1;
S
Steven Whitehouse 已提交
593
	u32 aflags = 0;
594
	unsigned blocks = 1;
595
	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
596 597

	if (!name->len || name->len > GFS2_FNAMESIZE)
598
		return -ENAMETOOLONG;
599

600
	error = gfs2_rsqa_alloc(dip);
601 602 603
	if (error)
		return error;

604 605 606 607
	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

608
	error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
609 610 611 612
	if (error)
		goto fail;

	error = create_ok(dip, name, mode);
613 614 615 616 617 618
	if (error)
		goto fail_gunlock;

	inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
	error = PTR_ERR(inode);
	if (!IS_ERR(inode)) {
619 620 621 622 623
		if (S_ISDIR(inode->i_mode)) {
			iput(inode);
			inode = ERR_PTR(-EISDIR);
			goto fail_gunlock;
		}
624
		d_instantiate(dentry, inode);
625
		error = 0;
626
		if (file) {
627
			if (S_ISREG(inode->i_mode))
M
Miklos Szeredi 已提交
628
				error = finish_open(file, dentry, gfs2_open_common, opened);
629 630
			else
				error = finish_no_open(file, NULL);
631
		}
S
Steven Whitehouse 已提交
632
		gfs2_glock_dq_uninit(ghs);
633
		return error;
634
	} else if (error != -ENOENT) {
635
		goto fail_gunlock;
636
	}
637

638
	error = gfs2_diradd_alloc_required(dir, name, &da);
639 640 641
	if (error < 0)
		goto fail_gunlock;

642
	inode = new_inode(sdp->sd_vfs);
643 644 645 646
	error = -ENOMEM;
	if (!inode)
		goto fail_gunlock;

647 648
	error = posix_acl_create(dir, &mode, &default_acl, &acl);
	if (error)
649
		goto fail_gunlock;
650

651
	ip = GFS2_I(inode);
652
	error = gfs2_rsqa_alloc(ip);
653
	if (error)
654
		goto fail_free_acls;
655 656

	inode->i_mode = mode;
657
	set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
658 659
	inode->i_rdev = dev;
	inode->i_size = size;
660
	inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
661
	gfs2_set_inode_blocks(inode, 1);
662
	munge_mode_uid_gid(dip, inode);
663
	check_and_update_goal(dip);
664
	ip->i_goal = dip->i_goal;
665 666 667 668 669
	ip->i_diskflags = 0;
	ip->i_eattr = 0;
	ip->i_height = 0;
	ip->i_depth = 0;
	ip->i_entries = 0;
670
	ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
671 672 673 674 675 676 677 678 679 680 681 682 683 684

	switch(mode & S_IFMT) {
	case S_IFREG:
		if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
		    gfs2_tune_get(sdp, gt_new_files_jdata))
			ip->i_diskflags |= GFS2_DIF_JDATA;
		gfs2_set_aops(inode);
		break;
	case S_IFDIR:
		ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
		ip->i_diskflags |= GFS2_DIF_JDATA;
		ip->i_entries = 2;
		break;
	}
685 686 687 688 689

	/* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
	if (dip->i_diskflags & GFS2_DIF_SYSTEM)
		ip->i_diskflags |= GFS2_DIF_SYSTEM;

690
	gfs2_set_inode_flags(inode);
691

692
	if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
S
Steven Whitehouse 已提交
693 694 695
	    (dip->i_diskflags & GFS2_DIF_TOPDIR))
		aflags |= GFS2_AF_ORLOV;

696 697 698 699
	if (default_acl || acl)
		blocks++;

	error = alloc_dinode(ip, aflags, &blocks);
700
	if (error)
701
		goto fail_free_inode;
702

703 704
	gfs2_set_inode_blocks(inode, blocks);

705
	error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
706
	if (error)
707
		goto fail_free_inode;
708

709
	glock_set_object(ip->i_gl, ip);
710 711 712 713
	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
	if (error)
		goto fail_free_inode;

714
	error = gfs2_trans_begin(sdp, blocks, 0);
715
	if (error)
716 717
		goto fail_gunlock2;

718 719 720 721
	if (blocks > 1) {
		ip->i_eattr = ip->i_no_addr + 1;
		gfs2_init_xattr(ip);
	}
722
	init_dinode(dip, ip, symname);
723 724
	gfs2_trans_end(sdp);

725
	error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
726 727 728
	if (error)
		goto fail_gunlock2;

729 730
	BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));

731
	error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
732 733
	if (error)
		goto fail_gunlock2;
734

735
	glock_set_object(ip->i_iopen_gh.gh_gl, ip);
736 737 738 739
	gfs2_glock_put(io_gl);
	gfs2_set_iop(inode);
	insert_inode_hash(inode);

740 741 742
	free_vfs_inode = 0; /* After this point, the inode is no longer
			       considered free. Any failures need to undo
			       the gfs2 structures. */
743
	if (default_acl) {
A
Al Viro 已提交
744
		error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
745 746 747 748
		posix_acl_release(default_acl);
	}
	if (acl) {
		if (!error)
A
Al Viro 已提交
749
			error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
750 751 752
		posix_acl_release(acl);
	}

753
	if (error)
754
		goto fail_gunlock3;
755

756 757
	error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
					     &gfs2_initxattrs, NULL);
758
	if (error)
759
		goto fail_gunlock3;
760

761
	error = link_dinode(dip, name, ip, &da);
762
	if (error)
763
		goto fail_gunlock3;
764

765
	mark_inode_dirty(inode);
766
	d_instantiate(dentry, inode);
M
Miklos Szeredi 已提交
767 768
	if (file) {
		*opened |= FILE_CREATED;
769
		error = finish_open(file, dentry, gfs2_open_common, opened);
M
Miklos Szeredi 已提交
770
	}
771 772
	gfs2_glock_dq_uninit(ghs);
	gfs2_glock_dq_uninit(ghs + 1);
773
	clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
774
	return error;
775

776
fail_gunlock3:
777 778
	gfs2_glock_dq_uninit(&ip->i_iopen_gh);
	gfs2_glock_put(io_gl);
779
fail_gunlock2:
780 781
	if (io_gl)
		clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
782
	gfs2_glock_dq_uninit(ghs + 1);
783 784 785
fail_free_inode:
	if (ip->i_gl)
		gfs2_glock_put(ip->i_gl);
786
	gfs2_rsqa_delete(ip, NULL);
787 788 789 790 791
fail_free_acls:
	if (default_acl)
		posix_acl_release(default_acl);
	if (acl)
		posix_acl_release(acl);
792
fail_gunlock:
793
	gfs2_dir_no_add(&da);
794
	gfs2_glock_dq_uninit(ghs);
795
	if (inode && !IS_ERR(inode)) {
796
		clear_nlink(inode);
797 798 799 800
		if (!free_vfs_inode)
			mark_inode_dirty(inode);
		set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
			&GFS2_I(inode)->i_flags);
801 802
		iput(inode);
	}
803
fail:
804
	return error;
805
}
806

D
David Teigland 已提交
807 808 809 810 811 812 813 814 815 816
/**
 * gfs2_create - Create a file
 * @dir: The directory in which to create the file
 * @dentry: The dentry of the new file
 * @mode: The mode of the new file
 *
 * Returns: errno
 */

static int gfs2_create(struct inode *dir, struct dentry *dentry,
A
Al Viro 已提交
817
		       umode_t mode, bool excl)
D
David Teigland 已提交
818
{
819
	return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
D
David Teigland 已提交
820 821 822
}

/**
823
 * __gfs2_lookup - Look up a filename in a directory and return its inode
D
David Teigland 已提交
824 825
 * @dir: The directory inode
 * @dentry: The dentry of the new inode
826 827
 * @file: File to be opened
 * @opened: atomic_open flags
D
David Teigland 已提交
828 829 830 831 832
 *
 *
 * Returns: errno
 */

833 834
static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
				    struct file *file, int *opened)
D
David Teigland 已提交
835
{
836 837 838 839 840 841 842
	struct inode *inode;
	struct dentry *d;
	struct gfs2_holder gh;
	struct gfs2_glock *gl;
	int error;

	inode = gfs2_lookupi(dir, &dentry->d_name, 0);
843 844
	if (inode == NULL) {
		d_add(dentry, NULL);
845
		return NULL;
846
	}
847 848 849 850 851 852 853 854
	if (IS_ERR(inode))
		return ERR_CAST(inode);

	gl = GFS2_I(inode)->i_gl;
	error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
	if (error) {
		iput(inode);
		return ERR_PTR(error);
855
	}
856 857

	d = d_splice_alias(inode, dentry);
858 859 860 861
	if (IS_ERR(d)) {
		gfs2_glock_dq_uninit(&gh);
		return d;
	}
862 863 864 865
	if (file && S_ISREG(inode->i_mode))
		error = finish_open(file, dentry, gfs2_open_common, opened);

	gfs2_glock_dq_uninit(&gh);
M
Miklos Szeredi 已提交
866 867
	if (error) {
		dput(d);
868
		return ERR_PTR(error);
M
Miklos Szeredi 已提交
869
	}
870 871 872 873 874 875 876
	return d;
}

static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
				  unsigned flags)
{
	return __gfs2_lookup(dir, dentry, NULL, NULL);
D
David Teigland 已提交
877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893
}

/**
 * gfs2_link - Link to a file
 * @old_dentry: The inode to link
 * @dir: Add link to this directory
 * @dentry: The name of the link
 *
 * Link the inode in "old_dentry" into the directory "dir" with the
 * name in "dentry".
 *
 * Returns: errno
 */

static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
		     struct dentry *dentry)
{
894 895
	struct gfs2_inode *dip = GFS2_I(dir);
	struct gfs2_sbd *sdp = GFS2_SB(dir);
896
	struct inode *inode = d_inode(old_dentry);
897
	struct gfs2_inode *ip = GFS2_I(inode);
D
David Teigland 已提交
898
	struct gfs2_holder ghs[2];
899
	struct buffer_head *dibh;
900
	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
D
David Teigland 已提交
901 902
	int error;

903
	if (S_ISDIR(inode->i_mode))
D
David Teigland 已提交
904 905
		return -EPERM;

906
	error = gfs2_rsqa_alloc(dip);
907 908 909
	if (error)
		return error;

D
David Teigland 已提交
910 911 912
	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);

913 914 915 916 917
	error = gfs2_glock_nq(ghs); /* parent */
	if (error)
		goto out_parent;

	error = gfs2_glock_nq(ghs + 1); /* child */
D
David Teigland 已提交
918
	if (error)
919
		goto out_child;
D
David Teigland 已提交
920

921 922 923 924
	error = -ENOENT;
	if (inode->i_nlink == 0)
		goto out_gunlock;

925
	error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
D
David Teigland 已提交
926 927 928
	if (error)
		goto out_gunlock;

929
	error = gfs2_dir_check(dir, &dentry->d_name, NULL);
D
David Teigland 已提交
930 931 932 933 934 935 936 937 938 939
	switch (error) {
	case -ENOENT:
		break;
	case 0:
		error = -EEXIST;
	default:
		goto out_gunlock;
	}

	error = -EINVAL;
940
	if (!dip->i_inode.i_nlink)
D
David Teigland 已提交
941 942
		goto out_gunlock;
	error = -EFBIG;
943
	if (dip->i_entries == (u32)-1)
D
David Teigland 已提交
944 945 946 947 948
		goto out_gunlock;
	error = -EPERM;
	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
		goto out_gunlock;
	error = -EINVAL;
949
	if (!ip->i_inode.i_nlink)
D
David Teigland 已提交
950 951
		goto out_gunlock;
	error = -EMLINK;
952
	if (ip->i_inode.i_nlink == (u32)-1)
D
David Teigland 已提交
953 954
		goto out_gunlock;

955
	error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
956
	if (error < 0)
D
David Teigland 已提交
957 958
		goto out_gunlock;

959 960
	if (da.nr_blocks) {
		struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
961
		error = gfs2_quota_lock_check(dip, &ap);
D
David Teigland 已提交
962
		if (error)
963
			goto out_gunlock;
D
David Teigland 已提交
964

965
		error = gfs2_inplace_reserve(dip, &ap);
D
David Teigland 已提交
966 967 968
		if (error)
			goto out_gunlock_q;

969
		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
D
David Teigland 已提交
970 971 972 973 974 975 976 977
		if (error)
			goto out_ipres;
	} else {
		error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
		if (error)
			goto out_ipres;
	}

978
	error = gfs2_meta_inode_buffer(ip, &dibh);
D
David Teigland 已提交
979 980 981
	if (error)
		goto out_end_trans;

982
	error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
983 984 985
	if (error)
		goto out_brelse;

986
	gfs2_trans_add_meta(ip->i_gl, dibh);
987
	inc_nlink(&ip->i_inode);
988
	ip->i_inode.i_ctime = current_time(&ip->i_inode);
S
Steven Whitehouse 已提交
989 990 991
	ihold(inode);
	d_instantiate(dentry, inode);
	mark_inode_dirty(inode);
D
David Teigland 已提交
992

993 994
out_brelse:
	brelse(dibh);
995
out_end_trans:
D
David Teigland 已提交
996
	gfs2_trans_end(sdp);
997
out_ipres:
998
	if (da.nr_blocks)
D
David Teigland 已提交
999
		gfs2_inplace_release(dip);
1000
out_gunlock_q:
1001
	if (da.nr_blocks)
D
David Teigland 已提交
1002
		gfs2_quota_unlock(dip);
1003
out_gunlock:
1004
	gfs2_dir_no_add(&da);
1005 1006 1007 1008
	gfs2_glock_dq(ghs + 1);
out_child:
	gfs2_glock_dq(ghs);
out_parent:
D
David Teigland 已提交
1009 1010 1011 1012 1013
	gfs2_holder_uninit(ghs);
	gfs2_holder_uninit(ghs + 1);
	return error;
}

1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
/*
 * gfs2_unlink_ok - check to see that a inode is still in a directory
 * @dip: the directory
 * @name: the name of the file
 * @ip: the inode
 *
 * Assumes that the lock on (at least) @dip is held.
 *
 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
 */

static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
			  const struct gfs2_inode *ip)
{
	int error;

	if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
		return -EPERM;

	if ((dip->i_inode.i_mode & S_ISVTX) &&
1034 1035
	    !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
	    !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1036 1037 1038 1039 1040
		return -EPERM;

	if (IS_APPEND(&dip->i_inode))
		return -EPERM;

1041
	error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1042 1043 1044
	if (error)
		return error;

1045
	return gfs2_dir_check(&dip->i_inode, name, ip);
1046 1047
}

D
David Teigland 已提交
1048
/**
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
 * @dip: The parent directory
 * @name: The name of the entry in the parent directory
 * @inode: The inode to be removed
 *
 * Called with all the locks and in a transaction. This will only be
 * called for a directory after it has been checked to ensure it is empty.
 *
 * Returns: 0 on success, or an error
 */

static int gfs2_unlink_inode(struct gfs2_inode *dip,
1061
			     const struct dentry *dentry)
1062
{
1063
	struct inode *inode = d_inode(dentry);
1064 1065 1066 1067 1068 1069 1070 1071
	struct gfs2_inode *ip = GFS2_I(inode);
	int error;

	error = gfs2_dir_del(dip, dentry);
	if (error)
		return error;

	ip->i_entries = 0;
1072
	inode->i_ctime = current_time(inode);
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086
	if (S_ISDIR(inode->i_mode))
		clear_nlink(inode);
	else
		drop_nlink(inode);
	mark_inode_dirty(inode);
	if (inode->i_nlink == 0)
		gfs2_unlink_di(inode);
	return 0;
}


/**
 * gfs2_unlink - Unlink an inode (this does rmdir as well)
 * @dir: The inode of the directory containing the inode to unlink
D
David Teigland 已提交
1087 1088
 * @dentry: The file itself
 *
1089 1090
 * This routine uses the type of the inode as a flag to figure out
 * whether this is an unlink or an rmdir.
D
David Teigland 已提交
1091 1092 1093 1094 1095 1096
 *
 * Returns: errno
 */

static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
{
1097 1098
	struct gfs2_inode *dip = GFS2_I(dir);
	struct gfs2_sbd *sdp = GFS2_SB(dir);
1099
	struct inode *inode = d_inode(dentry);
1100
	struct gfs2_inode *ip = GFS2_I(inode);
R
Russell Cattelan 已提交
1101 1102
	struct gfs2_holder ghs[3];
	struct gfs2_rgrpd *rgd;
1103 1104 1105 1106 1107 1108 1109
	int error;

	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

	error = -EROFS;
D
David Teigland 已提交
1110 1111

	gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
R
Russell Cattelan 已提交
1112
	gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
D
David Teigland 已提交
1113

S
Steven Whitehouse 已提交
1114
	rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1115
	if (!rgd)
1116
		goto out_inodes;
1117

R
Russell Cattelan 已提交
1118 1119 1120
	gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);


1121
	error = gfs2_glock_nq(ghs); /* parent */
D
David Teigland 已提交
1122
	if (error)
1123 1124 1125 1126 1127 1128
		goto out_parent;

	error = gfs2_glock_nq(ghs + 1); /* child */
	if (error)
		goto out_child;

1129
	error = -ENOENT;
1130
	if (inode->i_nlink == 0)
1131 1132
		goto out_rgrp;

1133 1134 1135 1136 1137 1138
	if (S_ISDIR(inode->i_mode)) {
		error = -ENOTEMPTY;
		if (ip->i_entries > 2 || inode->i_nlink > 2)
			goto out_rgrp;
	}

1139 1140 1141
	error = gfs2_glock_nq(ghs + 2); /* rgrp */
	if (error)
		goto out_rgrp;
D
David Teigland 已提交
1142 1143 1144

	error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
	if (error)
1145
		goto out_gunlock;
D
David Teigland 已提交
1146

1147 1148 1149
	error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
	if (error)
		goto out_end_trans;
D
David Teigland 已提交
1150

1151
	error = gfs2_unlink_inode(dip, dentry);
D
David Teigland 已提交
1152

1153 1154
out_end_trans:
	gfs2_trans_end(sdp);
1155
out_gunlock:
1156 1157 1158 1159 1160 1161
	gfs2_glock_dq(ghs + 2);
out_rgrp:
	gfs2_glock_dq(ghs + 1);
out_child:
	gfs2_glock_dq(ghs);
out_parent:
1162 1163 1164
	gfs2_holder_uninit(ghs + 2);
out_inodes:
	gfs2_holder_uninit(ghs + 1);
1165
	gfs2_holder_uninit(ghs);
D
David Teigland 已提交
1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180
	return error;
}

/**
 * gfs2_symlink - Create a symlink
 * @dir: The directory to create the symlink in
 * @dentry: The dentry to put the symlink in
 * @symname: The thing which the link points to
 *
 * Returns: errno
 */

static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
			const char *symname)
{
1181
	struct gfs2_sbd *sdp = GFS2_SB(dir);
1182
	unsigned int size;
D
David Teigland 已提交
1183 1184 1185 1186 1187

	size = strlen(symname);
	if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
		return -ENAMETOOLONG;

1188
	return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
D
David Teigland 已提交
1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
}

/**
 * gfs2_mkdir - Make a directory
 * @dir: The parent directory of the new one
 * @dentry: The dentry of the new directory
 * @mode: The mode of the new directory
 *
 * Returns: errno
 */

1200
static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
D
David Teigland 已提交
1201
{
1202 1203
	struct gfs2_sbd *sdp = GFS2_SB(dir);
	unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1204
	return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
D
David Teigland 已提交
1205 1206 1207 1208 1209 1210 1211
}

/**
 * gfs2_mknod - Make a special file
 * @dir: The directory in which the special file will reside
 * @dentry: The dentry of the special file
 * @mode: The mode of the special file
1212
 * @dev: The device specification of the special file
D
David Teigland 已提交
1213 1214 1215
 *
 */

A
Al Viro 已提交
1216
static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
D
David Teigland 已提交
1217 1218
		      dev_t dev)
{
1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234
	return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
}

/**
 * gfs2_atomic_open - Atomically open a file
 * @dir: The directory
 * @dentry: The proposed new entry
 * @file: The proposed new struct file
 * @flags: open flags
 * @mode: File mode
 * @opened: Flag to say whether the file has been opened or not
 *
 * Returns: error code or 0 for success
 */

static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1235 1236
			    struct file *file, unsigned flags,
			    umode_t mode, int *opened)
1237 1238 1239 1240
{
	struct dentry *d;
	bool excl = !!(flags & O_EXCL);

1241
	if (!d_in_lookup(dentry))
1242 1243
		goto skip_lookup;

1244 1245 1246
	d = __gfs2_lookup(dir, dentry, file, opened);
	if (IS_ERR(d))
		return PTR_ERR(d);
M
Miklos Szeredi 已提交
1247 1248
	if (d != NULL)
		dentry = d;
1249
	if (d_really_is_positive(dentry)) {
1250 1251
		if (!(*opened & FILE_OPENED))
			return finish_no_open(file, d);
M
Miklos Szeredi 已提交
1252
		dput(d);
1253 1254 1255
		return 0;
	}

M
Miklos Szeredi 已提交
1256
	BUG_ON(d != NULL);
1257 1258

skip_lookup:
1259 1260 1261 1262
	if (!(flags & O_CREAT))
		return -ENOENT;

	return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
D
David Teigland 已提交
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
/*
 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
 * @this: move this
 * @to: to here
 *
 * Follow @to back to the root and make sure we don't encounter @this
 * Assumes we already hold the rename lock.
 *
 * Returns: errno
 */

static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
{
	struct inode *dir = &to->i_inode;
	struct super_block *sb = dir->i_sb;
	struct inode *tmp;
	int error = 0;

	igrab(dir);

	for (;;) {
		if (dir == &this->i_inode) {
			error = -EINVAL;
			break;
		}
1290
		if (dir == d_inode(sb->s_root)) {
1291 1292 1293 1294
			error = 0;
			break;
		}

1295
		tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1296 1297 1298 1299
		if (!tmp) {
			error = -ENOENT;
			break;
		}
1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313
		if (IS_ERR(tmp)) {
			error = PTR_ERR(tmp);
			break;
		}

		iput(dir);
		dir = tmp;
	}

	iput(dir);

	return error;
}

1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334
/**
 * update_moved_ino - Update an inode that's being moved
 * @ip: The inode being moved
 * @ndip: The parent directory of the new filename
 * @dir_rename: True of ip is a directory
 *
 * Returns: errno
 */

static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
			    int dir_rename)
{
	int error;
	struct buffer_head *dibh;

	if (dir_rename)
		return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);

	error = gfs2_meta_inode_buffer(ip, &dibh);
	if (error)
		return error;
1335
	ip->i_inode.i_ctime = current_time(&ip->i_inode);
1336 1337 1338 1339 1340 1341 1342
	gfs2_trans_add_meta(ip->i_gl, dibh);
	gfs2_dinode_out(ip, dibh->b_data);
	brelse(dibh);
	return 0;
}


D
David Teigland 已提交
1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355
/**
 * gfs2_rename - Rename a file
 * @odir: Parent directory of old file name
 * @odentry: The old dentry of the file
 * @ndir: Parent directory of new file name
 * @ndentry: The new dentry of the file
 *
 * Returns: errno
 */

static int gfs2_rename(struct inode *odir, struct dentry *odentry,
		       struct inode *ndir, struct dentry *ndentry)
{
1356 1357
	struct gfs2_inode *odip = GFS2_I(odir);
	struct gfs2_inode *ndip = GFS2_I(ndir);
1358
	struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
D
David Teigland 已提交
1359
	struct gfs2_inode *nip = NULL;
1360
	struct gfs2_sbd *sdp = GFS2_SB(odir);
A
Andreas Gruenbacher 已提交
1361
	struct gfs2_holder ghs[5], r_gh;
R
Russell Cattelan 已提交
1362
	struct gfs2_rgrpd *nrgd;
D
David Teigland 已提交
1363 1364
	unsigned int num_gh;
	int dir_rename = 0;
1365
	struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
D
David Teigland 已提交
1366 1367 1368
	unsigned int x;
	int error;

A
Andreas Gruenbacher 已提交
1369
	gfs2_holder_mark_uninitialized(&r_gh);
1370 1371
	if (d_really_is_positive(ndentry)) {
		nip = GFS2_I(d_inode(ndentry));
D
David Teigland 已提交
1372 1373 1374 1375
		if (ip == nip)
			return 0;
	}

1376 1377 1378 1379
	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

1380
	error = gfs2_rsqa_alloc(ndip);
1381 1382 1383
	if (error)
		return error;

1384 1385 1386
	if (odip != ndip) {
		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
					   0, &r_gh);
D
David Teigland 已提交
1387 1388 1389
		if (error)
			goto out;

1390 1391
		if (S_ISDIR(ip->i_inode.i_mode)) {
			dir_rename = 1;
1392
			/* don't move a directory into its subdir */
1393 1394 1395 1396
			error = gfs2_ok_to_move(ip, ndip);
			if (error)
				goto out_gunlock_r;
		}
D
David Teigland 已提交
1397 1398
	}

1399
	num_gh = 1;
D
David Teigland 已提交
1400
	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1401 1402 1403 1404 1405 1406
	if (odip != ndip) {
		gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
		num_gh++;
	}
	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
	num_gh++;
D
David Teigland 已提交
1407

1408 1409 1410
	if (nip) {
		gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
		num_gh++;
R
Russell Cattelan 已提交
1411 1412 1413 1414
		/* grab the resource lock for unlink flag twiddling 
		 * this is the case of the target file already existing
		 * so we unlink before doing the rename
		 */
S
Steven Whitehouse 已提交
1415
		nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
R
Russell Cattelan 已提交
1416 1417
		if (nrgd)
			gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1418
	}
D
David Teigland 已提交
1419

1420 1421 1422 1423 1424
	for (x = 0; x < num_gh; x++) {
		error = gfs2_glock_nq(ghs + x);
		if (error)
			goto out_gunlock;
	}
D
David Teigland 已提交
1425

1426 1427 1428 1429
	error = -ENOENT;
	if (ip->i_inode.i_nlink == 0)
		goto out_gunlock;

D
David Teigland 已提交
1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442
	/* Check out the old directory */

	error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
	if (error)
		goto out_gunlock;

	/* Check out the new directory */

	if (nip) {
		error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
		if (error)
			goto out_gunlock;

1443 1444 1445 1446 1447
		if (nip->i_inode.i_nlink == 0) {
			error = -EAGAIN;
			goto out_gunlock;
		}

1448
		if (S_ISDIR(nip->i_inode.i_mode)) {
1449
			if (nip->i_entries < 2) {
1450
				gfs2_consist_inode(nip);
D
David Teigland 已提交
1451 1452 1453
				error = -EIO;
				goto out_gunlock;
			}
1454
			if (nip->i_entries > 2) {
D
David Teigland 已提交
1455 1456 1457 1458 1459
				error = -ENOTEMPTY;
				goto out_gunlock;
			}
		}
	} else {
1460
		error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
D
David Teigland 已提交
1461 1462 1463
		if (error)
			goto out_gunlock;

1464
		error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
D
David Teigland 已提交
1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475
		switch (error) {
		case -ENOENT:
			error = 0;
			break;
		case 0:
			error = -EEXIST;
		default:
			goto out_gunlock;
		};

		if (odip != ndip) {
1476
			if (!ndip->i_inode.i_nlink) {
1477
				error = -ENOENT;
D
David Teigland 已提交
1478 1479
				goto out_gunlock;
			}
1480
			if (ndip->i_entries == (u32)-1) {
D
David Teigland 已提交
1481 1482 1483
				error = -EFBIG;
				goto out_gunlock;
			}
1484
			if (S_ISDIR(ip->i_inode.i_mode) &&
1485
			    ndip->i_inode.i_nlink == (u32)-1) {
D
David Teigland 已提交
1486 1487 1488 1489 1490 1491 1492 1493 1494
				error = -EMLINK;
				goto out_gunlock;
			}
		}
	}

	/* Check out the dir to be renamed */

	if (dir_rename) {
1495
		error = gfs2_permission(d_inode(odentry), MAY_WRITE);
D
David Teigland 已提交
1496 1497 1498 1499
		if (error)
			goto out_gunlock;
	}

1500 1501 1502 1503 1504
	if (nip == NULL) {
		error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
		if (error)
			goto out_gunlock;
	}
D
David Teigland 已提交
1505

1506 1507
	if (da.nr_blocks) {
		struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1508
		error = gfs2_quota_lock_check(ndip, &ap);
D
David Teigland 已提交
1509
		if (error)
1510
			goto out_gunlock;
D
David Teigland 已提交
1511

1512
		error = gfs2_inplace_reserve(ndip, &ap);
D
David Teigland 已提交
1513 1514 1515
		if (error)
			goto out_gunlock_q;

1516 1517
		error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
					 4 * RES_LEAF + 4, 0);
D
David Teigland 已提交
1518 1519 1520 1521
		if (error)
			goto out_ipreserv;
	} else {
		error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
S
S. Wendy Cheng 已提交
1522
					 5 * RES_LEAF + 4, 0);
D
David Teigland 已提交
1523 1524 1525 1526 1527 1528
		if (error)
			goto out_gunlock;
	}

	/* Remove the target file, if it exists */

1529 1530
	if (nip)
		error = gfs2_unlink_inode(ndip, ndentry);
D
David Teigland 已提交
1531

1532 1533 1534
	error = update_moved_ino(ip, ndip, dir_rename);
	if (error)
		goto out_end_trans;
D
David Teigland 已提交
1535

1536
	error = gfs2_dir_del(odip, odentry);
D
David Teigland 已提交
1537 1538 1539
	if (error)
		goto out_end_trans;

1540
	error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
D
David Teigland 已提交
1541 1542 1543
	if (error)
		goto out_end_trans;

1544
out_end_trans:
D
David Teigland 已提交
1545
	gfs2_trans_end(sdp);
1546
out_ipreserv:
1547
	if (da.nr_blocks)
D
David Teigland 已提交
1548
		gfs2_inplace_release(ndip);
1549
out_gunlock_q:
1550
	if (da.nr_blocks)
D
David Teigland 已提交
1551
		gfs2_quota_unlock(ndip);
1552
out_gunlock:
1553
	gfs2_dir_no_add(&da);
1554 1555
	while (x--) {
		gfs2_glock_dq(ghs + x);
D
David Teigland 已提交
1556
		gfs2_holder_uninit(ghs + x);
1557
	}
1558
out_gunlock_r:
A
Andreas Gruenbacher 已提交
1559
	if (gfs2_holder_initialized(&r_gh))
D
David Teigland 已提交
1560
		gfs2_glock_dq_uninit(&r_gh);
1561
out:
D
David Teigland 已提交
1562 1563 1564
	return error;
}

1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584
/**
 * gfs2_exchange - exchange two files
 * @odir: Parent directory of old file name
 * @odentry: The old dentry of the file
 * @ndir: Parent directory of new file name
 * @ndentry: The new dentry of the file
 * @flags: The rename flags
 *
 * Returns: errno
 */

static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
			 struct inode *ndir, struct dentry *ndentry,
			 unsigned int flags)
{
	struct gfs2_inode *odip = GFS2_I(odir);
	struct gfs2_inode *ndip = GFS2_I(ndir);
	struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
	struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
	struct gfs2_sbd *sdp = GFS2_SB(odir);
A
Andreas Gruenbacher 已提交
1585
	struct gfs2_holder ghs[5], r_gh;
1586 1587 1588 1589 1590 1591
	unsigned int num_gh;
	unsigned int x;
	umode_t old_mode = oip->i_inode.i_mode;
	umode_t new_mode = nip->i_inode.i_mode;
	int error;

A
Andreas Gruenbacher 已提交
1592
	gfs2_holder_mark_uninitialized(&r_gh);
1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 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 1694 1695 1696 1697 1698 1699
	error = gfs2_rindex_update(sdp);
	if (error)
		return error;

	if (odip != ndip) {
		error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
					   0, &r_gh);
		if (error)
			goto out;

		if (S_ISDIR(old_mode)) {
			/* don't move a directory into its subdir */
			error = gfs2_ok_to_move(oip, ndip);
			if (error)
				goto out_gunlock_r;
		}

		if (S_ISDIR(new_mode)) {
			/* don't move a directory into its subdir */
			error = gfs2_ok_to_move(nip, odip);
			if (error)
				goto out_gunlock_r;
		}
	}

	num_gh = 1;
	gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
	if (odip != ndip) {
		gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
		num_gh++;
	}
	gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
	num_gh++;

	gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
	num_gh++;

	for (x = 0; x < num_gh; x++) {
		error = gfs2_glock_nq(ghs + x);
		if (error)
			goto out_gunlock;
	}

	error = -ENOENT;
	if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
		goto out_gunlock;

	error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
	if (error)
		goto out_gunlock;
	error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
	if (error)
		goto out_gunlock;

	if (S_ISDIR(old_mode)) {
		error = gfs2_permission(odentry->d_inode, MAY_WRITE);
		if (error)
			goto out_gunlock;
	}
	if (S_ISDIR(new_mode)) {
		error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
		if (error)
			goto out_gunlock;
	}
	error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
	if (error)
		goto out_gunlock;

	error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
	if (error)
		goto out_end_trans;

	error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
	if (error)
		goto out_end_trans;

	error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
			       IF2DT(old_mode));
	if (error)
		goto out_end_trans;

	error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
			       IF2DT(new_mode));
	if (error)
		goto out_end_trans;

	if (odip != ndip) {
		if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
			inc_nlink(&odip->i_inode);
			drop_nlink(&ndip->i_inode);
		} else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
			inc_nlink(&ndip->i_inode);
			drop_nlink(&odip->i_inode);
		}
	}
	mark_inode_dirty(&ndip->i_inode);
	if (odip != ndip)
		mark_inode_dirty(&odip->i_inode);

out_end_trans:
	gfs2_trans_end(sdp);
out_gunlock:
	while (x--) {
		gfs2_glock_dq(ghs + x);
		gfs2_holder_uninit(ghs + x);
	}
out_gunlock_r:
A
Andreas Gruenbacher 已提交
1700
	if (gfs2_holder_initialized(&r_gh))
1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720
		gfs2_glock_dq_uninit(&r_gh);
out:
	return error;
}

static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
			struct inode *ndir, struct dentry *ndentry,
			unsigned int flags)
{
	flags &= ~RENAME_NOREPLACE;

	if (flags & ~RENAME_EXCHANGE)
		return -EINVAL;

	if (flags & RENAME_EXCHANGE)
		return gfs2_exchange(odir, odentry, ndir, ndentry, flags);

	return gfs2_rename(odir, odentry, ndir, ndentry);
}

1721
/**
1722
 * gfs2_get_link - Follow a symbolic link
A
Al Viro 已提交
1723
 * @dentry: The dentry of the link
1724
 * @inode: The inode of the link
1725
 * @done: destructor for return value
1726
 *
A
Al Viro 已提交
1727
 * This can handle symlinks of any size.
1728
 *
A
Al Viro 已提交
1729
 * Returns: 0 on success or error code
1730 1731
 */

1732
static const char *gfs2_get_link(struct dentry *dentry,
1733 1734
				 struct inode *inode,
				 struct delayed_call *done)
1735
{
1736
	struct gfs2_inode *ip = GFS2_I(inode);
1737 1738
	struct gfs2_holder i_gh;
	struct buffer_head *dibh;
1739
	unsigned int size;
A
Al Viro 已提交
1740
	char *buf;
1741 1742
	int error;

1743 1744 1745
	if (!dentry)
		return ERR_PTR(-ECHILD);

1746 1747 1748 1749
	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
	error = gfs2_glock_nq(&i_gh);
	if (error) {
		gfs2_holder_uninit(&i_gh);
1750
		return ERR_PTR(error);
1751 1752
	}

S
Steven Whitehouse 已提交
1753 1754
	size = (unsigned int)i_size_read(&ip->i_inode);
	if (size == 0) {
1755
		gfs2_consist_inode(ip);
A
Al Viro 已提交
1756
		buf = ERR_PTR(-EIO);
1757 1758 1759 1760
		goto out;
	}

	error = gfs2_meta_inode_buffer(ip, &dibh);
A
Al Viro 已提交
1761 1762
	if (error) {
		buf = ERR_PTR(error);
1763 1764 1765
		goto out;
	}

1766
	buf = kzalloc(size + 1, GFP_NOFS);
A
Al Viro 已提交
1767 1768 1769
	if (!buf)
		buf = ERR_PTR(-ENOMEM);
	else
1770
		memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1771 1772 1773
	brelse(dibh);
out:
	gfs2_glock_dq_uninit(&i_gh);
1774
	if (!IS_ERR(buf))
1775
		set_delayed_call(done, kfree_link, buf);
1776
	return buf;
D
David Teigland 已提交
1777 1778 1779 1780
}

/**
 * gfs2_permission -
1781 1782 1783
 * @inode: The inode
 * @mask: The mask to be tested
 * @flags: Indicates whether this is an RCU path walk or not
D
David Teigland 已提交
1784
 *
1785 1786 1787 1788
 * This may be called from the VFS directly, or from within GFS2 with the
 * inode locked, so we look to see if the glock is already locked and only
 * lock the glock if its not already been done.
 *
D
David Teigland 已提交
1789 1790 1791
 * Returns: errno
 */

1792
int gfs2_permission(struct inode *inode, int mask)
D
David Teigland 已提交
1793
{
1794
	struct gfs2_inode *ip;
D
David Teigland 已提交
1795 1796
	struct gfs2_holder i_gh;
	int error;
1797

A
Andreas Gruenbacher 已提交
1798
	gfs2_holder_mark_uninitialized(&i_gh);
1799
	ip = GFS2_I(inode);
1800
	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1801 1802 1803 1804 1805
		if (mask & MAY_NOT_BLOCK)
			return -ECHILD;
		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
		if (error)
			return error;
1806
	}
D
David Teigland 已提交
1807

M
Miklos Szeredi 已提交
1808
	if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
E
Eryu Guan 已提交
1809
		error = -EPERM;
M
Miklos Szeredi 已提交
1810
	else
1811
		error = generic_permission(inode, mask);
A
Andreas Gruenbacher 已提交
1812
	if (gfs2_holder_initialized(&i_gh))
D
David Teigland 已提交
1813 1814 1815 1816 1817
		gfs2_glock_dq_uninit(&i_gh);

	return error;
}

S
Steven Whitehouse 已提交
1818
static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832
{
	setattr_copy(inode, attr);
	mark_inode_dirty(inode);
	return 0;
}

/**
 * gfs2_setattr_simple -
 * @ip:
 * @attr:
 *
 * Returns: errno
 */

S
Steven Whitehouse 已提交
1833
int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1834 1835 1836 1837
{
	int error;

	if (current->journal_info)
S
Steven Whitehouse 已提交
1838
		return __gfs2_setattr_simple(inode, attr);
1839

S
Steven Whitehouse 已提交
1840
	error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1841 1842 1843
	if (error)
		return error;

S
Steven Whitehouse 已提交
1844 1845
	error = __gfs2_setattr_simple(inode, attr);
	gfs2_trans_end(GFS2_SB(inode));
1846 1847 1848
	return error;
}

D
David Teigland 已提交
1849 1850
static int setattr_chown(struct inode *inode, struct iattr *attr)
{
1851 1852
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_sbd *sdp = GFS2_SB(inode);
1853 1854
	kuid_t ouid, nuid;
	kgid_t ogid, ngid;
D
David Teigland 已提交
1855
	int error;
1856
	struct gfs2_alloc_parms ap;
D
David Teigland 已提交
1857

1858 1859
	ouid = inode->i_uid;
	ogid = inode->i_gid;
D
David Teigland 已提交
1860 1861 1862
	nuid = attr->ia_uid;
	ngid = attr->ia_gid;

1863
	if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1864
		ouid = nuid = NO_UID_QUOTA_CHANGE;
1865
	if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1866
		ogid = ngid = NO_GID_QUOTA_CHANGE;
D
David Teigland 已提交
1867

1868
	error = gfs2_rsqa_alloc(ip);
1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879
	if (error)
		goto out;

	error = gfs2_rindex_update(sdp);
	if (error)
		goto out;

	error = gfs2_quota_lock(ip, nuid, ngid);
	if (error)
		goto out;

1880 1881
	ap.target = gfs2_get_inode_blocks(&ip->i_inode);

1882 1883
	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1884
		error = gfs2_quota_check(ip, nuid, ngid, &ap);
D
David Teigland 已提交
1885 1886 1887 1888 1889 1890 1891 1892
		if (error)
			goto out_gunlock_q;
	}

	error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
	if (error)
		goto out_gunlock_q;

S
Steven Whitehouse 已提交
1893
	error = gfs2_setattr_simple(inode, attr);
D
David Teigland 已提交
1894 1895 1896
	if (error)
		goto out_end_trans;

1897 1898
	if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
	    !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1899
		gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1900
		gfs2_quota_change(ip, ap.target, nuid, ngid);
D
David Teigland 已提交
1901 1902
	}

1903
out_end_trans:
D
David Teigland 已提交
1904
	gfs2_trans_end(sdp);
1905
out_gunlock_q:
D
David Teigland 已提交
1906
	gfs2_quota_unlock(ip);
1907
out:
D
David Teigland 已提交
1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923
	return error;
}

/**
 * gfs2_setattr - Change attributes on an inode
 * @dentry: The dentry which is changing
 * @attr: The structure describing the change
 *
 * The VFS layer wants to change one or more of an inodes attributes.  Write
 * that change out to disk.
 *
 * Returns: errno
 */

static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
{
1924
	struct inode *inode = d_inode(dentry);
1925
	struct gfs2_inode *ip = GFS2_I(inode);
D
David Teigland 已提交
1926 1927 1928
	struct gfs2_holder i_gh;
	int error;

1929
	error = gfs2_rsqa_alloc(ip);
1930 1931 1932
	if (error)
		return error;

D
David Teigland 已提交
1933 1934 1935 1936 1937 1938 1939 1940
	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
	if (error)
		return error;

	error = -EPERM;
	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
		goto out;

1941
	error = setattr_prepare(dentry, attr);
D
David Teigland 已提交
1942 1943 1944 1945
	if (error)
		goto out;

	if (attr->ia_valid & ATTR_SIZE)
S
Steven Whitehouse 已提交
1946
		error = gfs2_setattr_size(inode, attr->ia_size);
D
David Teigland 已提交
1947 1948
	else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
		error = setattr_chown(inode, attr);
1949
	else {
S
Steven Whitehouse 已提交
1950
		error = gfs2_setattr_simple(inode, attr);
1951 1952 1953
		if (!error && attr->ia_valid & ATTR_MODE)
			error = posix_acl_chmod(inode, inode->i_mode);
	}
D
David Teigland 已提交
1954

1955
out:
D
David Teigland 已提交
1956 1957
	if (!error)
		mark_inode_dirty(inode);
S
Steven Whitehouse 已提交
1958
	gfs2_glock_dq_uninit(&i_gh);
D
David Teigland 已提交
1959 1960 1961 1962 1963
	return error;
}

/**
 * gfs2_getattr - Read out an inode's attributes
1964
 * @path: Object to query
D
David Teigland 已提交
1965
 * @stat: The inode's stats
1966 1967
 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
 * @flags: AT_STATX_xxx setting
D
David Teigland 已提交
1968
 *
1969 1970 1971 1972 1973 1974
 * This may be called from the VFS directly, or from within GFS2 with the
 * inode locked, so we look to see if the glock is already locked and only
 * lock the glock if its not already been done. Note that its the NFS
 * readdirplus operation which causes this to be called (from filldir)
 * with the glock already held.
 *
D
David Teigland 已提交
1975 1976 1977
 * Returns: errno
 */

1978 1979
static int gfs2_getattr(const struct path *path, struct kstat *stat,
			u32 request_mask, unsigned int flags)
D
David Teigland 已提交
1980
{
1981
	struct inode *inode = d_inode(path->dentry);
1982
	struct gfs2_inode *ip = GFS2_I(inode);
D
David Teigland 已提交
1983 1984 1985
	struct gfs2_holder gh;
	int error;

A
Andreas Gruenbacher 已提交
1986
	gfs2_holder_mark_uninitialized(&gh);
1987
	if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1988 1989 1990
		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
		if (error)
			return error;
D
David Teigland 已提交
1991 1992
	}

1993
	generic_fillattr(inode, stat);
A
Andreas Gruenbacher 已提交
1994
	if (gfs2_holder_initialized(&gh))
1995 1996 1997
		gfs2_glock_dq_uninit(&gh);

	return 0;
D
David Teigland 已提交
1998 1999
}

2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
		       u64 start, u64 len)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_holder gh;
	int ret;

	ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
	if (ret)
		return ret;

A
Al Viro 已提交
2011
	inode_lock(inode);
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037

	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
	if (ret)
		goto out;

	if (gfs2_is_stuffed(ip)) {
		u64 phys = ip->i_no_addr << inode->i_blkbits;
		u64 size = i_size_read(inode);
		u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
			    FIEMAP_EXTENT_DATA_INLINE;
		phys += sizeof(struct gfs2_dinode);
		phys += start;
		if (start + len > size)
			len = size - start;
		if (start < size)
			ret = fiemap_fill_next_extent(fieinfo, start, phys,
						      len, flags);
		if (ret == 1)
			ret = 0;
	} else {
		ret = __generic_block_fiemap(inode, fieinfo, start, len,
					     gfs2_block_map);
	}

	gfs2_glock_dq_uninit(&gh);
out:
A
Al Viro 已提交
2038
	inode_unlock(inode);
2039 2040 2041
	return ret;
}

2042
const struct inode_operations gfs2_file_iops = {
2043
	.permission = gfs2_permission,
D
David Teigland 已提交
2044 2045 2046
	.setattr = gfs2_setattr,
	.getattr = gfs2_getattr,
	.listxattr = gfs2_listxattr,
2047
	.fiemap = gfs2_fiemap,
2048
	.get_acl = gfs2_get_acl,
2049
	.set_acl = gfs2_set_acl,
D
David Teigland 已提交
2050 2051
};

2052
const struct inode_operations gfs2_dir_iops = {
D
David Teigland 已提交
2053 2054 2055 2056 2057 2058
	.create = gfs2_create,
	.lookup = gfs2_lookup,
	.link = gfs2_link,
	.unlink = gfs2_unlink,
	.symlink = gfs2_symlink,
	.mkdir = gfs2_mkdir,
2059
	.rmdir = gfs2_unlink,
D
David Teigland 已提交
2060
	.mknod = gfs2_mknod,
2061
	.rename = gfs2_rename2,
2062
	.permission = gfs2_permission,
D
David Teigland 已提交
2063 2064 2065
	.setattr = gfs2_setattr,
	.getattr = gfs2_getattr,
	.listxattr = gfs2_listxattr,
2066
	.fiemap = gfs2_fiemap,
2067
	.get_acl = gfs2_get_acl,
2068
	.set_acl = gfs2_set_acl,
2069
	.atomic_open = gfs2_atomic_open,
D
David Teigland 已提交
2070 2071
};

2072
const struct inode_operations gfs2_symlink_iops = {
2073
	.get_link = gfs2_get_link,
2074
	.permission = gfs2_permission,
D
David Teigland 已提交
2075 2076 2077
	.setattr = gfs2_setattr,
	.getattr = gfs2_getattr,
	.listxattr = gfs2_listxattr,
2078
	.fiemap = gfs2_fiemap,
D
David Teigland 已提交
2079 2080
};