inode.c 50.9 KB
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/*
 *  linux/fs/nfs/inode.c
 *
 *  Copyright (C) 1992  Rick Sladkey
 *
 *  nfs inode and superblock handling functions
 *
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 *  Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
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 *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
 *
 *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
 *  J.S.Peatfield@damtp.cam.ac.uk
 *
 */

#include <linux/module.h>
#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/stats.h>
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#include <linux/sunrpc/metrics.h>
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#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/nfs4_mount.h>
#include <linux/lockd/bind.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/vfs.h>
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#include <linux/inet.h>
#include <linux/nfs_xdr.h>
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#include <linux/slab.h>
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#include <linux/compat.h>
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#include <linux/freezer.h>
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#include <asm/uaccess.h>

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#include "nfs4_fs.h"
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#include "callback.h"
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#include "delegation.h"
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#include "iostat.h"
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#include "internal.h"
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#include "fscache.h"
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#include "pnfs.h"
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#include "nfs.h"
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#include "netns.h"
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#include "nfstrace.h"

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#define NFSDBG_FACILITY		NFSDBG_VFS

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#define NFS_64_BIT_INODE_NUMBERS_ENABLED	1

/* Default is to see 64-bit inode numbers */
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static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
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static void nfs_invalidate_inode(struct inode *);
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static int nfs_update_inode(struct inode *, struct nfs_fattr *);
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static struct kmem_cache * nfs_inode_cachep;
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static inline unsigned long
nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
{
	return nfs_fileid_to_ino_t(fattr->fileid);
}

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/**
 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
 * @word: long word containing the bit lock
 */
int nfs_wait_bit_killable(void *word)
{
	if (fatal_signal_pending(current))
		return -ERESTARTSYS;
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	freezable_schedule_unsafe();
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	return 0;
}
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EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
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/**
 * nfs_compat_user_ino64 - returns the user-visible inode number
 * @fileid: 64-bit fileid
 *
 * This function returns a 32-bit inode number if the boot parameter
 * nfs.enable_ino64 is zero.
 */
u64 nfs_compat_user_ino64(u64 fileid)
{
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#ifdef CONFIG_COMPAT
	compat_ulong_t ino;
#else	
	unsigned long ino;
#endif
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	if (enable_ino64)
		return fileid;
	ino = fileid;
	if (sizeof(ino) < sizeof(fileid))
		ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
	return ino;
}

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int nfs_drop_inode(struct inode *inode)
{
	return NFS_STALE(inode) || generic_drop_inode(inode);
}
EXPORT_SYMBOL_GPL(nfs_drop_inode);

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void nfs_clear_inode(struct inode *inode)
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{
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	/*
	 * The following should never happen...
	 */
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	WARN_ON_ONCE(nfs_have_writebacks(inode));
	WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
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	nfs_zap_acl_cache(inode);
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	nfs_access_zap_cache(inode);
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	nfs_fscache_release_inode_cookie(inode);
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}
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EXPORT_SYMBOL_GPL(nfs_clear_inode);
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void nfs_evict_inode(struct inode *inode)
{
	truncate_inode_pages(&inode->i_data, 0);
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	clear_inode(inode);
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	nfs_clear_inode(inode);
}

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/**
 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
 */
int nfs_sync_mapping(struct address_space *mapping)
{
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	int ret = 0;
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	if (mapping->nrpages != 0) {
		unmap_mapping_range(mapping, 0, 0, 0);
		ret = nfs_wb_all(mapping->host);
	}
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	return ret;
}

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/*
 * Invalidate the local caches
 */
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static void nfs_zap_caches_locked(struct inode *inode)
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{
	struct nfs_inode *nfsi = NFS_I(inode);
	int mode = inode->i_mode;

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	nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);

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	nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
	nfsi->attrtimeo_timestamp = jiffies;
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	memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
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	if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
		nfs_fscache_invalidate(inode);
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		nfsi->cache_validity |= NFS_INO_INVALID_ATTR
					| NFS_INO_INVALID_LABEL
					| NFS_INO_INVALID_DATA
					| NFS_INO_INVALID_ACCESS
					| NFS_INO_INVALID_ACL
					| NFS_INO_REVAL_PAGECACHE;
	} else
		nfsi->cache_validity |= NFS_INO_INVALID_ATTR
					| NFS_INO_INVALID_LABEL
					| NFS_INO_INVALID_ACCESS
					| NFS_INO_INVALID_ACL
					| NFS_INO_REVAL_PAGECACHE;
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}
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void nfs_zap_caches(struct inode *inode)
{
	spin_lock(&inode->i_lock);
	nfs_zap_caches_locked(inode);
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	spin_unlock(&inode->i_lock);
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}

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void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
{
	if (mapping->nrpages != 0) {
		spin_lock(&inode->i_lock);
		NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
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		nfs_fscache_invalidate(inode);
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		spin_unlock(&inode->i_lock);
	}
}

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void nfs_zap_acl_cache(struct inode *inode)
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{
	void (*clear_acl_cache)(struct inode *);

	clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
	if (clear_acl_cache != NULL)
		clear_acl_cache(inode);
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	spin_lock(&inode->i_lock);
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	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
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	spin_unlock(&inode->i_lock);
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}
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EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
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void nfs_invalidate_atime(struct inode *inode)
{
	spin_lock(&inode->i_lock);
	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
	spin_unlock(&inode->i_lock);
}
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EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
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/*
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 * Invalidate, but do not unhash, the inode.
 * NB: must be called with inode->i_lock held!
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 */
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static void nfs_invalidate_inode(struct inode *inode)
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{
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	set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
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	nfs_zap_caches_locked(inode);
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}

struct nfs_find_desc {
	struct nfs_fh		*fh;
	struct nfs_fattr	*fattr;
};

/*
 * In NFSv3 we can have 64bit inode numbers. In order to support
 * this, and re-exported directories (also seen in NFSv2)
 * we are forced to allow 2 different inodes to have the same
 * i_ino.
 */
static int
nfs_find_actor(struct inode *inode, void *opaque)
{
	struct nfs_find_desc	*desc = (struct nfs_find_desc *)opaque;
	struct nfs_fh		*fh = desc->fh;
	struct nfs_fattr	*fattr = desc->fattr;

	if (NFS_FILEID(inode) != fattr->fileid)
		return 0;
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	if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
		return 0;
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	if (nfs_compare_fh(NFS_FH(inode), fh))
		return 0;
	if (is_bad_inode(inode) || NFS_STALE(inode))
		return 0;
	return 1;
}

static int
nfs_init_locked(struct inode *inode, void *opaque)
{
	struct nfs_find_desc	*desc = (struct nfs_find_desc *)opaque;
	struct nfs_fattr	*fattr = desc->fattr;

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	set_nfs_fileid(inode, fattr->fileid);
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	nfs_copy_fh(NFS_FH(inode), desc->fh);
	return 0;
}

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#ifdef CONFIG_NFS_V4_SECURITY_LABEL
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void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
					struct nfs4_label *label)
{
	int error;

	if (label == NULL)
		return;

	if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL) == 0)
		return;

	if (NFS_SERVER(inode)->nfs_client->cl_minorversion < 2)
		return;

	if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
		error = security_inode_notifysecctx(inode, label->label,
				label->len);
		if (error)
			printk(KERN_ERR "%s() %s %d "
					"security_inode_notifysecctx() %d\n",
					__func__,
					(char *)label->label,
					label->len, error);
	}
}

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struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
{
	struct nfs4_label *label = NULL;
	int minor_version = server->nfs_client->cl_minorversion;

	if (minor_version < 2)
		return label;

	if (!(server->caps & NFS_CAP_SECURITY_LABEL))
		return label;

	label = kzalloc(sizeof(struct nfs4_label), flags);
	if (label == NULL)
		return ERR_PTR(-ENOMEM);

	label->label = kzalloc(NFS4_MAXLABELLEN, flags);
	if (label->label == NULL) {
		kfree(label);
		return ERR_PTR(-ENOMEM);
	}
	label->len = NFS4_MAXLABELLEN;

	return label;
}
EXPORT_SYMBOL_GPL(nfs4_label_alloc);
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#else
void inline nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
					struct nfs4_label *label)
{
}
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#endif
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EXPORT_SYMBOL_GPL(nfs_setsecurity);
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/*
 * This is our front-end to iget that looks up inodes by file handle
 * instead of inode number.
 */
struct inode *
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nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
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{
	struct nfs_find_desc desc = {
		.fh	= fh,
		.fattr	= fattr
	};
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	struct inode *inode = ERR_PTR(-ENOENT);
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	unsigned long hash;

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	nfs_attr_check_mountpoint(sb, fattr);

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	if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
	    !nfs_attr_use_mounted_on_fileid(fattr))
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		goto out_no_inode;
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	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
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		goto out_no_inode;

	hash = nfs_fattr_to_ino_t(fattr);

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	inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
	if (inode == NULL) {
		inode = ERR_PTR(-ENOMEM);
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		goto out_no_inode;
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	}
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	if (inode->i_state & I_NEW) {
		struct nfs_inode *nfsi = NFS_I(inode);
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		unsigned long now = jiffies;
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		/* We set i_ino for the few things that still rely on it,
		 * such as stat(2) */
		inode->i_ino = hash;

		/* We can't support update_atime(), since the server will reset it */
		inode->i_flags |= S_NOATIME|S_NOCMTIME;
		inode->i_mode = fattr->mode;
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		if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
				&& nfs_server_capable(inode, NFS_CAP_MODE))
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			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
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		/* Why so? Because we want revalidate for devices/FIFOs, and
		 * that's precisely what we have in nfs_file_inode_operations.
		 */
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		inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
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		if (S_ISREG(inode->i_mode)) {
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			inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
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			inode->i_data.a_ops = &nfs_file_aops;
			inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
		} else if (S_ISDIR(inode->i_mode)) {
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			inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
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			inode->i_fop = &nfs_dir_operations;
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			inode->i_data.a_ops = &nfs_dir_aops;
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			/* Deal with crossing mountpoints */
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			if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
					fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
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				if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
					inode->i_op = &nfs_referral_inode_operations;
				else
					inode->i_op = &nfs_mountpoint_inode_operations;
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				inode->i_fop = NULL;
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				inode->i_flags |= S_AUTOMOUNT;
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			}
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		} else if (S_ISLNK(inode->i_mode))
			inode->i_op = &nfs_symlink_inode_operations;
		else
			init_special_inode(inode, inode->i_mode, fattr->rdev);

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		memset(&inode->i_atime, 0, sizeof(inode->i_atime));
		memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
		memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
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		inode->i_version = 0;
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		inode->i_size = 0;
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		clear_nlink(inode);
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		inode->i_uid = make_kuid(&init_user_ns, -2);
		inode->i_gid = make_kgid(&init_user_ns, -2);
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		inode->i_blocks = 0;
		memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
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		nfsi->write_io = 0;
		nfsi->read_io = 0;
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		nfsi->read_cache_jiffies = fattr->time_start;
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		nfsi->attr_gencount = fattr->gencount;
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		if (fattr->valid & NFS_ATTR_FATTR_ATIME)
			inode->i_atime = fattr->atime;
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		else if (nfs_server_capable(inode, NFS_CAP_ATIME))
			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
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		if (fattr->valid & NFS_ATTR_FATTR_MTIME)
			inode->i_mtime = fattr->mtime;
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		else if (nfs_server_capable(inode, NFS_CAP_MTIME))
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			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
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		if (fattr->valid & NFS_ATTR_FATTR_CTIME)
			inode->i_ctime = fattr->ctime;
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		else if (nfs_server_capable(inode, NFS_CAP_CTIME))
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			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
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		if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
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			inode->i_version = fattr->change_attr;
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		else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
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			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
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		if (fattr->valid & NFS_ATTR_FATTR_SIZE)
			inode->i_size = nfs_size_to_loff_t(fattr->size);
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		else
			nfsi->cache_validity |= NFS_INO_INVALID_ATTR
				| NFS_INO_REVAL_PAGECACHE;
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		if (fattr->valid & NFS_ATTR_FATTR_NLINK)
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			set_nlink(inode, fattr->nlink);
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		else if (nfs_server_capable(inode, NFS_CAP_NLINK))
			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
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		if (fattr->valid & NFS_ATTR_FATTR_OWNER)
			inode->i_uid = fattr->uid;
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		else if (nfs_server_capable(inode, NFS_CAP_OWNER))
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			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
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		if (fattr->valid & NFS_ATTR_FATTR_GROUP)
			inode->i_gid = fattr->gid;
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		else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
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			nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
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		if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
			inode->i_blocks = fattr->du.nfs2.blocks;
		if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
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			/*
			 * report the blocks in 512byte units
			 */
			inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
		}
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		nfs_setsecurity(inode, fattr, label);

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		nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
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		nfsi->attrtimeo_timestamp = now;
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		nfsi->access_cache = RB_ROOT;
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		nfs_fscache_init_inode_cookie(inode);

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		unlock_new_inode(inode);
	} else
		nfs_refresh_inode(inode, fattr);
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	dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n",
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		inode->i_sb->s_id,
		(long long)NFS_FILEID(inode),
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		nfs_display_fhandle_hash(fh),
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		atomic_read(&inode->i_count));

out:
	return inode;

out_no_inode:
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	dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
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	goto out;
}
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EXPORT_SYMBOL_GPL(nfs_fhget);
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#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
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int
nfs_setattr(struct dentry *dentry, struct iattr *attr)
{
	struct inode *inode = dentry->d_inode;
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	struct nfs_fattr *fattr;
	int error = -ENOMEM;
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	nfs_inc_stats(inode, NFSIOS_VFSSETATTR);

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	/* skip mode change if it's just for clearing setuid/setgid */
	if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
		attr->ia_valid &= ~ATTR_MODE;

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	if (attr->ia_valid & ATTR_SIZE) {
		if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
			attr->ia_valid &= ~ATTR_SIZE;
	}

	/* Optimization: if the end result is no change, don't RPC */
	attr->ia_valid &= NFS_VALID_ATTRS;
504
	if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
L
Linus Torvalds 已提交
505 506
		return 0;

507 508
	trace_nfs_setattr_enter(inode);

509
	/* Write all dirty data */
510 511
	if (S_ISREG(inode->i_mode)) {
		nfs_inode_dio_wait(inode);
512
		nfs_wb_all(inode);
513
	}
514 515 516 517

	fattr = nfs_alloc_fattr();
	if (fattr == NULL)
		goto out;
518 519 520 521
	/*
	 * Return any delegations if we're going to change ACLs
	 */
	if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
522
		NFS_PROTO(inode)->return_delegation(inode);
523
	error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
524
	if (error == 0)
525
		error = nfs_refresh_inode(inode, fattr);
526 527
	nfs_free_fattr(fattr);
out:
528
	trace_nfs_setattr_exit(inode, error);
529 530
	return error;
}
B
Bryan Schumaker 已提交
531
EXPORT_SYMBOL_GPL(nfs_setattr);
532

533 534 535 536 537 538 539 540 541 542 543
/**
 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
 * @inode: inode of the file used
 * @offset: file offset to start truncating
 *
 * This is a copy of the common vmtruncate, but with the locking
 * corrected to take into account the fact that NFS requires
 * inode->i_size to be updated under the inode->i_lock.
 */
static int nfs_vmtruncate(struct inode * inode, loff_t offset)
{
N
npiggin@suse.de 已提交
544
	int err;
545

N
npiggin@suse.de 已提交
546 547 548
	err = inode_newsize_ok(inode, offset);
	if (err)
		goto out;
549

N
npiggin@suse.de 已提交
550 551 552 553
	spin_lock(&inode->i_lock);
	i_size_write(inode, offset);
	spin_unlock(&inode->i_lock);

554
	truncate_pagecache(inode, offset);
N
npiggin@suse.de 已提交
555 556
out:
	return err;
557 558
}

559 560 561 562 563 564 565 566 567 568 569
/**
 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
 * @inode: pointer to struct inode
 * @attr: pointer to struct iattr
 *
 * Note: we do this in the *proc.c in order to ensure that
 *       it works for things like exclusive creates too.
 */
void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
{
	if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
570
		spin_lock(&inode->i_lock);
L
Linus Torvalds 已提交
571
		if ((attr->ia_valid & ATTR_MODE) != 0) {
572 573
			int mode = attr->ia_mode & S_IALLUGO;
			mode |= inode->i_mode & ~S_IALLUGO;
L
Linus Torvalds 已提交
574 575 576 577 578 579
			inode->i_mode = mode;
		}
		if ((attr->ia_valid & ATTR_UID) != 0)
			inode->i_uid = attr->ia_uid;
		if ((attr->ia_valid & ATTR_GID) != 0)
			inode->i_gid = attr->ia_gid;
580
		NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
581
		spin_unlock(&inode->i_lock);
582 583
	}
	if ((attr->ia_valid & ATTR_SIZE) != 0) {
C
Chuck Lever 已提交
584
		nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
585
		nfs_vmtruncate(inode, attr->ia_size);
586
	}
L
Linus Torvalds 已提交
587
}
B
Bryan Schumaker 已提交
588
EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
L
Linus Torvalds 已提交
589 590 591 592

int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
	struct inode *inode = dentry->d_inode;
593
	int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
L
Linus Torvalds 已提交
594 595
	int err;

596
	trace_nfs_getattr_enter(inode);
597
	/* Flush out writes to the server in order to update c/mtime.  */
598
	if (S_ISREG(inode->i_mode)) {
599
		nfs_inode_dio_wait(inode);
600 601 602
		err = filemap_write_and_wait(inode->i_mapping);
		if (err)
			goto out;
603
	}
604 605 606 607 608 609 610 611 612 613 614 615

	/*
	 * We may force a getattr if the user cares about atime.
	 *
	 * Note that we only have to check the vfsmount flags here:
	 *  - NFS always sets S_NOATIME by so checking it would give a
	 *    bogus result
	 *  - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
	 *    no point in checking those.
	 */
 	if ((mnt->mnt_flags & MNT_NOATIME) ||
 	    ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
L
Linus Torvalds 已提交
616
		need_atime = 0;
617

L
Linus Torvalds 已提交
618 619 620 621
	if (need_atime)
		err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
	else
		err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
P
Peter Staubach 已提交
622
	if (!err) {
L
Linus Torvalds 已提交
623
		generic_fillattr(inode, stat);
624
		stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
P
Peter Staubach 已提交
625
	}
626
out:
627
	trace_nfs_getattr_exit(inode, err);
L
Linus Torvalds 已提交
628 629
	return err;
}
B
Bryan Schumaker 已提交
630
EXPORT_SYMBOL_GPL(nfs_getattr);
L
Linus Torvalds 已提交
631

632 633 634
static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
{
	atomic_set(&l_ctx->count, 1);
635 636
	l_ctx->lockowner.l_owner = current->files;
	l_ctx->lockowner.l_pid = current->tgid;
637
	INIT_LIST_HEAD(&l_ctx->list);
638
	nfs_iocounter_init(&l_ctx->io_count);
639 640 641 642
}

static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
{
643 644
	struct nfs_lock_context *head = &ctx->lock_context;
	struct nfs_lock_context *pos = head;
645

646
	do {
647
		if (pos->lockowner.l_owner != current->files)
648
			continue;
649
		if (pos->lockowner.l_pid != current->tgid)
650 651 652
			continue;
		atomic_inc(&pos->count);
		return pos;
653
	} while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
654 655 656 657 658 659
	return NULL;
}

struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
{
	struct nfs_lock_context *res, *new = NULL;
660
	struct inode *inode = ctx->dentry->d_inode;
661 662 663 664 665 666 667

	spin_lock(&inode->i_lock);
	res = __nfs_find_lock_context(ctx);
	if (res == NULL) {
		spin_unlock(&inode->i_lock);
		new = kmalloc(sizeof(*new), GFP_KERNEL);
		if (new == NULL)
668
			return ERR_PTR(-ENOMEM);
669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686
		nfs_init_lock_context(new);
		spin_lock(&inode->i_lock);
		res = __nfs_find_lock_context(ctx);
		if (res == NULL) {
			list_add_tail(&new->list, &ctx->lock_context.list);
			new->open_context = ctx;
			res = new;
			new = NULL;
		}
	}
	spin_unlock(&inode->i_lock);
	kfree(new);
	return res;
}

void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
{
	struct nfs_open_context *ctx = l_ctx->open_context;
687
	struct inode *inode = ctx->dentry->d_inode;
688 689 690 691 692 693 694 695

	if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
		return;
	list_del(&l_ctx->list);
	spin_unlock(&inode->i_lock);
	kfree(l_ctx);
}

T
Trond Myklebust 已提交
696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712
/**
 * nfs_close_context - Common close_context() routine NFSv2/v3
 * @ctx: pointer to context
 * @is_sync: is this a synchronous close
 *
 * always ensure that the attributes are up to date if we're mounted
 * with close-to-open semantics
 */
void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
{
	struct inode *inode;
	struct nfs_server *server;

	if (!(ctx->mode & FMODE_WRITE))
		return;
	if (!is_sync)
		return;
713
	inode = ctx->dentry->d_inode;
T
Trond Myklebust 已提交
714 715 716 717 718 719 720
	if (!list_empty(&NFS_I(inode)->open_files))
		return;
	server = NFS_SERVER(inode);
	if (server->flags & NFS_MOUNT_NOCTO)
		return;
	nfs_revalidate_inode(server, inode);
}
B
Bryan Schumaker 已提交
721
EXPORT_SYMBOL_GPL(nfs_close_context);
T
Trond Myklebust 已提交
722

723
struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
L
Linus Torvalds 已提交
724 725
{
	struct nfs_open_context *ctx;
726 727 728
	struct rpc_cred *cred = rpc_lookup_cred();
	if (IS_ERR(cred))
		return ERR_CAST(cred);
L
Linus Torvalds 已提交
729

730
	ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
731 732 733
	if (!ctx) {
		put_rpccred(cred);
		return ERR_PTR(-ENOMEM);
L
Linus Torvalds 已提交
734
	}
735 736 737 738 739 740 741 742 743 744
	nfs_sb_active(dentry->d_sb);
	ctx->dentry = dget(dentry);
	ctx->cred = cred;
	ctx->state = NULL;
	ctx->mode = f_mode;
	ctx->flags = 0;
	ctx->error = 0;
	nfs_init_lock_context(&ctx->lock_context);
	ctx->lock_context.open_context = ctx;
	INIT_LIST_HEAD(&ctx->list);
745
	ctx->mdsthreshold = NULL;
L
Linus Torvalds 已提交
746 747
	return ctx;
}
B
Bryan Schumaker 已提交
748
EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
L
Linus Torvalds 已提交
749 750 751 752

struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
{
	if (ctx != NULL)
753
		atomic_inc(&ctx->lock_context.count);
L
Linus Torvalds 已提交
754 755
	return ctx;
}
B
Bryan Schumaker 已提交
756
EXPORT_SYMBOL_GPL(get_nfs_open_context);
L
Linus Torvalds 已提交
757

T
Trond Myklebust 已提交
758
static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
L
Linus Torvalds 已提交
759
{
760 761
	struct inode *inode = ctx->dentry->d_inode;
	struct super_block *sb = ctx->dentry->d_sb;
762

763
	if (!list_empty(&ctx->list)) {
764 765 766 767 768
		if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
			return;
		list_del(&ctx->list);
		spin_unlock(&inode->i_lock);
	} else if (!atomic_dec_and_test(&ctx->lock_context.count))
T
Trond Myklebust 已提交
769
		return;
770 771
	if (inode != NULL)
		NFS_PROTO(inode)->close_context(ctx, is_sync);
772 773
	if (ctx->cred != NULL)
		put_rpccred(ctx->cred);
774
	dput(ctx->dentry);
775
	nfs_sb_deactive(sb);
776
	kfree(ctx->mdsthreshold);
777 778 779
	kfree(ctx);
}

780 781 782 783
void put_nfs_open_context(struct nfs_open_context *ctx)
{
	__put_nfs_open_context(ctx, 0);
}
B
Bryan Schumaker 已提交
784
EXPORT_SYMBOL_GPL(put_nfs_open_context);
785

L
Linus Torvalds 已提交
786 787 788 789
/*
 * Ensure that mmap has a recent RPC credential for use when writing out
 * shared pages
 */
790
void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
L
Linus Torvalds 已提交
791
{
792
	struct inode *inode = ctx->dentry->d_inode;
L
Linus Torvalds 已提交
793 794 795 796 797 798
	struct nfs_inode *nfsi = NFS_I(inode);

	spin_lock(&inode->i_lock);
	list_add(&ctx->list, &nfsi->open_files);
	spin_unlock(&inode->i_lock);
}
799 800 801 802 803 804 805 806
EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);

void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
{
	filp->private_data = get_nfs_open_context(ctx);
	if (list_empty(&ctx->list))
		nfs_inode_attach_open_context(ctx);
}
B
Bryan Schumaker 已提交
807
EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
L
Linus Torvalds 已提交
808

809 810 811
/*
 * Given an inode, search for an open context with the desired characteristics
 */
812
struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
L
Linus Torvalds 已提交
813 814 815 816 817 818
{
	struct nfs_inode *nfsi = NFS_I(inode);
	struct nfs_open_context *pos, *ctx = NULL;

	spin_lock(&inode->i_lock);
	list_for_each_entry(pos, &nfsi->open_files, list) {
819 820
		if (cred != NULL && pos->cred != cred)
			continue;
821 822 823 824
		if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
			continue;
		ctx = get_nfs_open_context(pos);
		break;
L
Linus Torvalds 已提交
825 826 827 828 829
	}
	spin_unlock(&inode->i_lock);
	return ctx;
}

830
static void nfs_file_clear_open_context(struct file *filp)
L
Linus Torvalds 已提交
831
{
832
	struct nfs_open_context *ctx = nfs_file_open_context(filp);
L
Linus Torvalds 已提交
833 834

	if (ctx) {
835 836
		struct inode *inode = ctx->dentry->d_inode;

L
Linus Torvalds 已提交
837 838 839 840
		filp->private_data = NULL;
		spin_lock(&inode->i_lock);
		list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
		spin_unlock(&inode->i_lock);
841
		__put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
L
Linus Torvalds 已提交
842 843 844 845 846 847 848 849 850 851
	}
}

/*
 * These allocate and release file read/write context information.
 */
int nfs_open(struct inode *inode, struct file *filp)
{
	struct nfs_open_context *ctx;

852 853 854
	ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
	if (IS_ERR(ctx))
		return PTR_ERR(ctx);
L
Linus Torvalds 已提交
855 856
	nfs_file_set_open_context(filp, ctx);
	put_nfs_open_context(ctx);
D
David Howells 已提交
857
	nfs_fscache_set_inode_cookie(inode, filp);
L
Linus Torvalds 已提交
858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874
	return 0;
}

int nfs_release(struct inode *inode, struct file *filp)
{
	nfs_file_clear_open_context(filp);
	return 0;
}

/*
 * This function is called whenever some part of NFS notices that
 * the cached attributes have to be refreshed.
 */
int
__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
{
	int		 status = -ESTALE;
875
	struct nfs4_label *label = NULL;
876
	struct nfs_fattr *fattr = NULL;
L
Linus Torvalds 已提交
877 878 879 880 881
	struct nfs_inode *nfsi = NFS_I(inode);

	dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
		inode->i_sb->s_id, (long long)NFS_FILEID(inode));

882 883
	trace_nfs_revalidate_inode_enter(inode);

884
	if (is_bad_inode(inode))
885
		goto out;
L
Linus Torvalds 已提交
886
	if (NFS_STALE(inode))
887
		goto out;
888

889 890 891 892 893
	status = -ENOMEM;
	fattr = nfs_alloc_fattr();
	if (fattr == NULL)
		goto out;

894
	nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
895 896 897 898 899 900 901

	label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
	if (IS_ERR(label)) {
		status = PTR_ERR(label);
		goto out;
	}

902
	status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
L
Linus Torvalds 已提交
903 904 905 906 907 908 909
	if (status != 0) {
		dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
			 inode->i_sb->s_id,
			 (long long)NFS_FILEID(inode), status);
		if (status == -ESTALE) {
			nfs_zap_caches(inode);
			if (!S_ISDIR(inode->i_mode))
B
Benny Halevy 已提交
910
				set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
L
Linus Torvalds 已提交
911
		}
912
		goto err_out;
L
Linus Torvalds 已提交
913 914
	}

915
	status = nfs_refresh_inode(inode, fattr);
L
Linus Torvalds 已提交
916 917 918 919
	if (status) {
		dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
			 inode->i_sb->s_id,
			 (long long)NFS_FILEID(inode), status);
920
		goto err_out;
L
Linus Torvalds 已提交
921
	}
922

923
	if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
924
		nfs_zap_acl_cache(inode);
925

L
Linus Torvalds 已提交
926 927 928 929
	dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
		inode->i_sb->s_id,
		(long long)NFS_FILEID(inode));

930 931 932
err_out:
	nfs4_label_free(label);
out:
933
	nfs_free_fattr(fattr);
934
	trace_nfs_revalidate_inode_exit(inode, status);
L
Linus Torvalds 已提交
935 936 937 938 939 940 941
	return status;
}

int nfs_attribute_timeout(struct inode *inode)
{
	struct nfs_inode *nfsi = NFS_I(inode);

942 943 944
	return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
}

945
int nfs_attribute_cache_expired(struct inode *inode)
946
{
947
	if (nfs_have_delegated_attributes(inode))
L
Linus Torvalds 已提交
948
		return 0;
949
	return nfs_attribute_timeout(inode);
L
Linus Torvalds 已提交
950 951 952 953 954 955 956 957 958 959 960
}

/**
 * nfs_revalidate_inode - Revalidate the inode attributes
 * @server - pointer to nfs_server struct
 * @inode - pointer to inode struct
 *
 * Updates inode attribute information by retrieving the data from the server.
 */
int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
{
961 962
	if (!(NFS_I(inode)->cache_validity &
			(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
963
			&& !nfs_attribute_cache_expired(inode))
L
Linus Torvalds 已提交
964 965 966
		return NFS_STALE(inode) ? -ESTALE : 0;
	return __nfs_revalidate_inode(server, inode);
}
B
Bryan Schumaker 已提交
967
EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
L
Linus Torvalds 已提交
968

969
static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
970 971
{
	struct nfs_inode *nfsi = NFS_I(inode);
972 973
	int ret;

974
	if (mapping->nrpages != 0) {
975 976 977 978 979 980
		if (S_ISREG(inode->i_mode)) {
			ret = nfs_sync_mapping(mapping);
			if (ret < 0)
				return ret;
		}
		ret = invalidate_inode_pages2(mapping);
981 982 983 984 985
		if (ret < 0)
			return ret;
	}
	spin_lock(&inode->i_lock);
	nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
986
	if (S_ISDIR(inode->i_mode))
987 988 989
		memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
	spin_unlock(&inode->i_lock);
	nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
D
David Howells 已提交
990
	nfs_fscache_wait_on_invalidate(inode);
991

992 993 994 995 996
	dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
			inode->i_sb->s_id, (long long)NFS_FILEID(inode));
	return 0;
}

997 998 999 1000 1001 1002 1003 1004 1005
static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
{
	if (nfs_have_delegated_attributes(inode))
		return false;
	return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
		|| nfs_attribute_timeout(inode)
		|| NFS_STALE(inode);
}

1006 1007 1008 1009 1010 1011 1012 1013 1014
/**
 * nfs_revalidate_mapping - Revalidate the pagecache
 * @inode - pointer to host inode
 * @mapping - pointer to mapping
 */
int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
{
	struct nfs_inode *nfsi = NFS_I(inode);
	int ret = 0;
1015

1016 1017 1018 1019
	/* swapfiles are not supposed to be shared. */
	if (IS_SWAPFILE(inode))
		goto out;

1020
	if (nfs_mapping_need_revalidate_inode(inode)) {
1021 1022 1023
		ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
		if (ret < 0)
			goto out;
1024
	}
1025 1026
	if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
		trace_nfs_invalidate_mapping_enter(inode);
1027
		ret = nfs_invalidate_mapping(inode, mapping);
1028 1029 1030
		trace_nfs_invalidate_mapping_exit(inode, ret);
	}

1031
out:
1032
	return ret;
1033 1034
}

1035
static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1036 1037
{
	struct nfs_inode *nfsi = NFS_I(inode);
1038
	unsigned long ret = 0;
1039

1040 1041
	if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
			&& (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1042 1043
			&& inode->i_version == fattr->pre_change_attr) {
		inode->i_version = fattr->change_attr;
1044 1045
		if (S_ISDIR(inode->i_mode))
			nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1046
		ret |= NFS_INO_INVALID_ATTR;
1047
	}
1048
	/* If we have atomic WCC data, we may update some attributes */
1049 1050
	if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
			&& (fattr->valid & NFS_ATTR_FATTR_CTIME)
1051 1052 1053 1054
			&& timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
		memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
		ret |= NFS_INO_INVALID_ATTR;
	}
1055 1056 1057 1058

	if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
			&& (fattr->valid & NFS_ATTR_FATTR_MTIME)
			&& timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1059 1060 1061 1062
		memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
		if (S_ISDIR(inode->i_mode))
			nfsi->cache_validity |= NFS_INO_INVALID_DATA;
		ret |= NFS_INO_INVALID_ATTR;
1063
	}
1064 1065 1066
	if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
			&& (fattr->valid & NFS_ATTR_FATTR_SIZE)
			&& i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1067 1068 1069 1070
			&& nfsi->npages == 0) {
		i_size_write(inode, nfs_size_to_loff_t(fattr->size));
		ret |= NFS_INO_INVALID_ATTR;
	}
D
David Howells 已提交
1071 1072 1073 1074

	if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
		nfs_fscache_invalidate(inode);

1075
	return ret;
1076 1077
}

L
Linus Torvalds 已提交
1078
/**
1079
 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
L
Linus Torvalds 已提交
1080 1081 1082 1083 1084 1085 1086
 * @inode - pointer to inode
 * @fattr - updated attributes
 *
 * Verifies the attribute cache. If we have just changed the attributes,
 * so that fattr carries weak cache consistency data, then it may
 * also update the ctime/mtime/change_attribute.
 */
1087
static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
L
Linus Torvalds 已提交
1088 1089 1090
{
	struct nfs_inode *nfsi = NFS_I(inode);
	loff_t cur_size, new_isize;
1091
	unsigned long invalid = 0;
L
Linus Torvalds 已提交
1092

1093

1094 1095
	if (nfs_have_delegated_attributes(inode))
		return 0;
1096
	/* Has the inode gone and changed behind our back? */
1097 1098 1099
	if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
		return -EIO;
	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1100 1101
		return -EIO;

1102
	if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1103
			inode->i_version != fattr->change_attr)
1104
		invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
L
Linus Torvalds 已提交
1105 1106

	/* Verify a few of the more important attributes */
1107
	if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1108
		invalid |= NFS_INO_INVALID_ATTR;
1109

1110 1111 1112 1113 1114 1115
	if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
		cur_size = i_size_read(inode);
		new_isize = nfs_size_to_loff_t(fattr->size);
		if (cur_size != new_isize && nfsi->npages == 0)
			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
	}
L
Linus Torvalds 已提交
1116 1117

	/* Have any file permissions changed? */
1118 1119
	if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
		invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1120
	if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1121
		invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1122
	if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1123
		invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
L
Linus Torvalds 已提交
1124 1125

	/* Has the link count changed? */
1126
	if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1127
		invalid |= NFS_INO_INVALID_ATTR;
L
Linus Torvalds 已提交
1128

1129
	if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1130 1131 1132 1133
		invalid |= NFS_INO_INVALID_ATIME;

	if (invalid != 0)
		nfsi->cache_validity |= invalid;
L
Linus Torvalds 已提交
1134

1135
	nfsi->read_cache_jiffies = fattr->time_start;
L
Linus Torvalds 已提交
1136 1137 1138
	return 0;
}

1139
static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1140
{
1141 1142
	if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
		return 0;
1143 1144 1145 1146 1147
	return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
}

static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
{
1148 1149
	if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
		return 0;
1150 1151
	return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
}
1152

1153
static atomic_long_t nfs_attr_generation_counter;
1154 1155 1156

static unsigned long nfs_read_attr_generation_counter(void)
{
1157
	return atomic_long_read(&nfs_attr_generation_counter);
1158 1159 1160 1161
}

unsigned long nfs_inc_attr_generation_counter(void)
{
1162
	return atomic_long_inc_return(&nfs_attr_generation_counter);
1163 1164 1165 1166 1167 1168 1169
}

void nfs_fattr_init(struct nfs_fattr *fattr)
{
	fattr->valid = 0;
	fattr->time_start = jiffies;
	fattr->gencount = nfs_inc_attr_generation_counter();
1170 1171
	fattr->owner_name = NULL;
	fattr->group_name = NULL;
1172
}
B
Bryan Schumaker 已提交
1173
EXPORT_SYMBOL_GPL(nfs_fattr_init);
1174

1175 1176 1177 1178 1179 1180 1181 1182 1183
struct nfs_fattr *nfs_alloc_fattr(void)
{
	struct nfs_fattr *fattr;

	fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
	if (fattr != NULL)
		nfs_fattr_init(fattr);
	return fattr;
}
B
Bryan Schumaker 已提交
1184
EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194

struct nfs_fh *nfs_alloc_fhandle(void)
{
	struct nfs_fh *fh;

	fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
	if (fh != NULL)
		fh->size = 0;
	return fh;
}
B
Bryan Schumaker 已提交
1195
EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1196

1197
#ifdef NFS_DEBUG
1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
/*
 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
 *                             in the same way that wireshark does
 *
 * @fh: file handle
 *
 * For debugging only.
 */
u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
{
	/* wireshark uses 32-bit AUTODIN crc and does a bitwise
	 * not on the result */
1210
	return nfs_fhandle_hash(fh);
1211
}
C
Chuck Lever 已提交
1212
EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1213 1214

/*
1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225
 * _nfs_display_fhandle - display an NFS file handle on the console
 *
 * @fh: file handle to display
 * @caption: display caption
 *
 * For debugging only.
 */
void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
{
	unsigned short i;

1226
	if (fh == NULL || fh->size == 0) {
1227 1228 1229 1230
		printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
		return;
	}

1231 1232
	printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
	       caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
	for (i = 0; i < fh->size; i += 16) {
		__be32 *pos = (__be32 *)&fh->data[i];

		switch ((fh->size - i - 1) >> 2) {
		case 0:
			printk(KERN_DEFAULT " %08x\n",
				be32_to_cpup(pos));
			break;
		case 1:
			printk(KERN_DEFAULT " %08x %08x\n",
				be32_to_cpup(pos), be32_to_cpup(pos + 1));
			break;
		case 2:
			printk(KERN_DEFAULT " %08x %08x %08x\n",
				be32_to_cpup(pos), be32_to_cpup(pos + 1),
				be32_to_cpup(pos + 2));
			break;
		default:
			printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
				be32_to_cpup(pos), be32_to_cpup(pos + 1),
				be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
		}
	}
}
C
Chuck Lever 已提交
1257
EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1258 1259
#endif

1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272
/**
 * nfs_inode_attrs_need_update - check if the inode attributes need updating
 * @inode - pointer to inode
 * @fattr - attributes
 *
 * Attempt to divine whether or not an RPC call reply carrying stale
 * attributes got scheduled after another call carrying updated ones.
 *
 * To do so, the function first assumes that a more recent ctime means
 * that the attributes in fattr are newer, however it also attempt to
 * catch the case where ctime either didn't change, or went backwards
 * (if someone reset the clock on the server) by looking at whether
 * or not this RPC call was started after the inode was last updated.
1273
 * Note also the check for wraparound of 'attr_gencount'
1274 1275 1276 1277 1278 1279 1280 1281 1282
 *
 * The function returns 'true' if it thinks the attributes in 'fattr' are
 * more recent than the ones cached in the inode.
 *
 */
static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
{
	const struct nfs_inode *nfsi = NFS_I(inode);

1283
	return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
T
Trond Myklebust 已提交
1284 1285
		nfs_ctime_need_update(inode, fattr) ||
		nfs_size_need_update(inode, fattr) ||
1286
		((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1287 1288 1289 1290
}

static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
{
1291 1292 1293 1294
	int ret;

	trace_nfs_refresh_inode_enter(inode);

1295
	if (nfs_inode_attrs_need_update(inode, fattr))
1296 1297 1298 1299 1300 1301
		ret = nfs_update_inode(inode, fattr);
	else
		ret = nfs_check_inode_attributes(inode, fattr);

	trace_nfs_refresh_inode_exit(inode, ret);
	return ret;
1302 1303
}

1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320
/**
 * nfs_refresh_inode - try to update the inode attribute cache
 * @inode - pointer to inode
 * @fattr - updated attributes
 *
 * Check that an RPC call that returned attributes has not overlapped with
 * other recent updates of the inode metadata, then decide whether it is
 * safe to do a full update of the inode attributes, or whether just to
 * call nfs_check_inode_attributes.
 */
int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
{
	int status;

	if ((fattr->valid & NFS_ATTR_FATTR) == 0)
		return 0;
	spin_lock(&inode->i_lock);
1321
	status = nfs_refresh_inode_locked(inode, fattr);
1322
	spin_unlock(&inode->i_lock);
D
David Howells 已提交
1323

1324 1325
	return status;
}
B
Bryan Schumaker 已提交
1326
EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1327

1328 1329 1330 1331 1332
static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
{
	struct nfs_inode *nfsi = NFS_I(inode);

	nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
D
David Howells 已提交
1333
	if (S_ISDIR(inode->i_mode)) {
1334
		nfsi->cache_validity |= NFS_INO_INVALID_DATA;
D
David Howells 已提交
1335 1336
		nfs_fscache_invalidate(inode);
	}
1337 1338 1339 1340 1341
	if ((fattr->valid & NFS_ATTR_FATTR) == 0)
		return 0;
	return nfs_refresh_inode_locked(inode, fattr);
}

1342 1343 1344 1345 1346 1347 1348
/**
 * nfs_post_op_update_inode - try to update the inode attribute cache
 * @inode - pointer to inode
 * @fattr - updated attributes
 *
 * After an operation that has changed the inode metadata, mark the
 * attribute cache as being invalid, then try to update it.
1349 1350 1351 1352 1353 1354
 *
 * NB: if the server didn't return any post op attributes, this
 * function will force the retrieval of attributes before the next
 * NFS request.  Thus it should be used only for operations that
 * are expected to change one or more attributes, to avoid
 * unnecessary NFS requests and trips through nfs_update_inode().
1355 1356 1357
 */
int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
{
1358
	int status;
1359

1360
	spin_lock(&inode->i_lock);
1361
	status = nfs_post_op_update_inode_locked(inode, fattr);
1362
	spin_unlock(&inode->i_lock);
1363

1364
	return status;
1365
}
B
Bryan Schumaker 已提交
1366
EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1367

1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380
/**
 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
 * @inode - pointer to inode
 * @fattr - updated attributes
 *
 * After an operation that has changed the inode metadata, mark the
 * attribute cache as being invalid, then try to update it. Fake up
 * weak cache consistency data, if none exist.
 *
 * This function is mainly designed to be used by the ->write_done() functions.
 */
int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
{
1381 1382 1383 1384 1385 1386
	int status;

	spin_lock(&inode->i_lock);
	/* Don't do a WCC update if these attributes are already stale */
	if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
			!nfs_inode_attrs_need_update(inode, fattr)) {
1387 1388 1389 1390
		fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
				| NFS_ATTR_FATTR_PRESIZE
				| NFS_ATTR_FATTR_PREMTIME
				| NFS_ATTR_FATTR_PRECTIME);
1391 1392
		goto out_noforce;
	}
1393 1394
	if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
			(fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1395
		fattr->pre_change_attr = inode->i_version;
1396
		fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1397
	}
1398 1399
	if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
			(fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1400
		memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1401 1402 1403 1404
		fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
	}
	if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
			(fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1405
		memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1406 1407 1408 1409
		fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
	}
	if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
			(fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1410
		fattr->pre_size = i_size_read(inode);
1411
		fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1412
	}
1413 1414 1415 1416
out_noforce:
	status = nfs_post_op_update_inode_locked(inode, fattr);
	spin_unlock(&inode->i_lock);
	return status;
1417
}
B
Bryan Schumaker 已提交
1418
EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1419

L
Linus Torvalds 已提交
1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431
/*
 * Many nfs protocol calls return the new file attributes after
 * an operation.  Here we update the inode to reflect the state
 * of the server's inode.
 *
 * This is a bit tricky because we have to make sure all dirty pages
 * have been sent off to the server before calling invalidate_inode_pages.
 * To make sure no other process adds more write requests while we try
 * our best to flush them, we make them sleep during the attribute refresh.
 *
 * A very similar scenario holds for the dir cache.
 */
1432
static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
L
Linus Torvalds 已提交
1433
{
1434
	struct nfs_server *server;
L
Linus Torvalds 已提交
1435
	struct nfs_inode *nfsi = NFS_I(inode);
1436
	loff_t cur_isize, new_isize;
1437
	unsigned long invalid = 0;
1438
	unsigned long now = jiffies;
1439
	unsigned long save_cache_validity;
L
Linus Torvalds 已提交
1440

1441
	dfprintk(VFS, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n",
1442
			__func__, inode->i_sb->s_id, inode->i_ino,
1443
			nfs_display_fhandle_hash(NFS_FH(inode)),
L
Linus Torvalds 已提交
1444 1445
			atomic_read(&inode->i_count), fattr->valid);

1446 1447 1448 1449 1450 1451 1452 1453
	if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
		printk(KERN_ERR "NFS: server %s error: fileid changed\n"
			"fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
			NFS_SERVER(inode)->nfs_client->cl_hostname,
			inode->i_sb->s_id, (long long)nfsi->fileid,
			(long long)fattr->fileid);
		goto out_err;
	}
L
Linus Torvalds 已提交
1454 1455 1456 1457

	/*
	 * Make sure the inode's type hasn't changed.
	 */
1458 1459 1460 1461 1462 1463 1464 1465
	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
		/*
		* Big trouble! The inode has become a different object.
		*/
		printk(KERN_DEBUG "NFS: %s: inode %ld mode changed, %07o to %07o\n",
				__func__, inode->i_ino, inode->i_mode, fattr->mode);
		goto out_err;
	}
L
Linus Torvalds 已提交
1466

1467
	server = NFS_SERVER(inode);
T
Trond Myklebust 已提交
1468
	/* Update the fsid? */
1469
	if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1470
			!nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1471
			!IS_AUTOMOUNT(inode))
1472 1473
		server->fsid = fattr->fsid;

L
Linus Torvalds 已提交
1474 1475 1476
	/*
	 * Update the read time so we don't revalidate too often.
	 */
1477
	nfsi->read_cache_jiffies = fattr->time_start;
1478

1479 1480 1481 1482 1483
	save_cache_validity = nfsi->cache_validity;
	nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
			| NFS_INO_INVALID_ATIME
			| NFS_INO_REVAL_FORCED
			| NFS_INO_REVAL_PAGECACHE);
L
Linus Torvalds 已提交
1484

1485
	/* Do atomic weak cache consistency updates */
1486
	invalid |= nfs_wcc_update_inode(inode, fattr);
1487

1488
	/* More cache consistency checks */
1489
	if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1490
		if (inode->i_version != fattr->change_attr) {
1491 1492
			dprintk("NFS: change_attr change on server for file %s/%ld\n",
					inode->i_sb->s_id, inode->i_ino);
1493 1494 1495 1496 1497
			invalid |= NFS_INO_INVALID_ATTR
				| NFS_INO_INVALID_DATA
				| NFS_INO_INVALID_ACCESS
				| NFS_INO_INVALID_ACL
				| NFS_INO_REVAL_PAGECACHE;
1498 1499
			if (S_ISDIR(inode->i_mode))
				nfs_force_lookup_revalidate(inode);
1500
			inode->i_version = fattr->change_attr;
1501
		}
1502 1503
	} else if (server->caps & NFS_CAP_CHANGE_ATTR)
		invalid |= save_cache_validity;
1504 1505

	if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1506
		memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1507 1508 1509 1510
	} else if (server->caps & NFS_CAP_MTIME)
		invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
				| NFS_INO_REVAL_FORCED);

1511
	if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1512
		memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1513 1514 1515
	} else if (server->caps & NFS_CAP_CTIME)
		invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
				| NFS_INO_REVAL_FORCED);
1516

1517
	/* Check if our cached file size is stale */
1518 1519 1520 1521 1522 1523
	if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
		new_isize = nfs_size_to_loff_t(fattr->size);
		cur_isize = i_size_read(inode);
		if (new_isize != cur_isize) {
			/* Do we perhaps have any outstanding writes, or has
			 * the file grown beyond our last write? */
1524 1525
			if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) ||
			     new_isize > cur_isize) {
1526 1527 1528
				i_size_write(inode, new_isize);
				invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
			}
1529 1530 1531 1532 1533 1534
			dprintk("NFS: isize change on server for file %s/%ld "
					"(%Ld to %Ld)\n",
					inode->i_sb->s_id,
					inode->i_ino,
					(long long)cur_isize,
					(long long)new_isize);
L
Linus Torvalds 已提交
1535
		}
1536 1537 1538 1539
	} else
		invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
				| NFS_INO_REVAL_PAGECACHE
				| NFS_INO_REVAL_FORCED);
L
Linus Torvalds 已提交
1540 1541


1542 1543
	if (fattr->valid & NFS_ATTR_FATTR_ATIME)
		memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1544 1545 1546
	else if (server->caps & NFS_CAP_ATIME)
		invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
				| NFS_INO_REVAL_FORCED);
L
Linus Torvalds 已提交
1547

1548 1549
	if (fattr->valid & NFS_ATTR_FATTR_MODE) {
		if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1550 1551 1552
			umode_t newmode = inode->i_mode & S_IFMT;
			newmode |= fattr->mode & S_IALLUGO;
			inode->i_mode = newmode;
1553 1554
			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
		}
1555 1556 1557 1558 1559 1560
	} else if (server->caps & NFS_CAP_MODE)
		invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
				| NFS_INO_INVALID_ACCESS
				| NFS_INO_INVALID_ACL
				| NFS_INO_REVAL_FORCED);

1561
	if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1562
		if (!uid_eq(inode->i_uid, fattr->uid)) {
1563 1564 1565
			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
			inode->i_uid = fattr->uid;
		}
1566 1567 1568 1569 1570 1571
	} else if (server->caps & NFS_CAP_OWNER)
		invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
				| NFS_INO_INVALID_ACCESS
				| NFS_INO_INVALID_ACL
				| NFS_INO_REVAL_FORCED);

1572
	if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1573
		if (!gid_eq(inode->i_gid, fattr->gid)) {
1574 1575 1576
			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
			inode->i_gid = fattr->gid;
		}
1577 1578 1579 1580 1581
	} else if (server->caps & NFS_CAP_OWNER_GROUP)
		invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
				| NFS_INO_INVALID_ACCESS
				| NFS_INO_INVALID_ACL
				| NFS_INO_REVAL_FORCED);
1582

1583 1584 1585 1586 1587
	if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
		if (inode->i_nlink != fattr->nlink) {
			invalid |= NFS_INO_INVALID_ATTR;
			if (S_ISDIR(inode->i_mode))
				invalid |= NFS_INO_INVALID_DATA;
M
Miklos Szeredi 已提交
1588
			set_nlink(inode, fattr->nlink);
1589
		}
1590 1591 1592
	} else if (server->caps & NFS_CAP_NLINK)
		invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
				| NFS_INO_REVAL_FORCED);
L
Linus Torvalds 已提交
1593

1594
	if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
L
Linus Torvalds 已提交
1595 1596 1597 1598 1599
		/*
		 * report the blocks in 512byte units
		 */
		inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
 	}
1600 1601
	if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
		inode->i_blocks = fattr->du.nfs2.blocks;
L
Linus Torvalds 已提交
1602 1603

	/* Update attrtimeo value if we're out of the unstable period */
1604
	if (invalid & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) {
C
Chuck Lever 已提交
1605
		nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
L
Linus Torvalds 已提交
1606
		nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1607
		nfsi->attrtimeo_timestamp = now;
1608
		nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1609
	} else {
1610
		if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1611 1612 1613 1614
			if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
				nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
			nfsi->attrtimeo_timestamp = now;
		}
L
Linus Torvalds 已提交
1615
	}
1616
	invalid &= ~NFS_INO_INVALID_ATTR;
1617
	invalid &= ~NFS_INO_INVALID_LABEL;
L
Linus Torvalds 已提交
1618 1619 1620 1621
	/* Don't invalidate the data if we were to blame */
	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
				|| S_ISLNK(inode->i_mode)))
		invalid &= ~NFS_INO_INVALID_DATA;
1622
	if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1623
			(save_cache_validity & NFS_INO_REVAL_FORCED))
1624
		nfsi->cache_validity |= invalid;
L
Linus Torvalds 已提交
1625

D
David Howells 已提交
1626 1627 1628
	if (invalid & NFS_INO_INVALID_DATA)
		nfs_fscache_invalidate(inode);

L
Linus Torvalds 已提交
1629
	return 0;
1630
 out_err:
L
Linus Torvalds 已提交
1631 1632 1633 1634 1635 1636 1637 1638 1639
	/*
	 * No need to worry about unhashing the dentry, as the
	 * lookup validation will know that the inode is bad.
	 * (But we fall through to invalidate the caches.)
	 */
	nfs_invalidate_inode(inode);
	return -ESTALE;
}

D
David Howells 已提交
1640
struct inode *nfs_alloc_inode(struct super_block *sb)
L
Linus Torvalds 已提交
1641 1642
{
	struct nfs_inode *nfsi;
1643
	nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
L
Linus Torvalds 已提交
1644 1645
	if (!nfsi)
		return NULL;
1646 1647
	nfsi->flags = 0UL;
	nfsi->cache_validity = 0UL;
1648 1649 1650 1651
#ifdef CONFIG_NFS_V3_ACL
	nfsi->acl_access = ERR_PTR(-EAGAIN);
	nfsi->acl_default = ERR_PTR(-EAGAIN);
#endif
B
Bryan Schumaker 已提交
1652
#if IS_ENABLED(CONFIG_NFS_V4)
1653 1654
	nfsi->nfs4_acl = NULL;
#endif /* CONFIG_NFS_V4 */
L
Linus Torvalds 已提交
1655 1656
	return &nfsi->vfs_inode;
}
B
Bryan Schumaker 已提交
1657
EXPORT_SYMBOL_GPL(nfs_alloc_inode);
L
Linus Torvalds 已提交
1658

N
Nick Piggin 已提交
1659
static void nfs_i_callback(struct rcu_head *head)
L
Linus Torvalds 已提交
1660
{
N
Nick Piggin 已提交
1661
	struct inode *inode = container_of(head, struct inode, i_rcu);
L
Linus Torvalds 已提交
1662 1663 1664
	kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
}

N
Nick Piggin 已提交
1665 1666 1667 1668
void nfs_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, nfs_i_callback);
}
B
Bryan Schumaker 已提交
1669
EXPORT_SYMBOL_GPL(nfs_destroy_inode);
N
Nick Piggin 已提交
1670

A
Andrew Morton 已提交
1671 1672
static inline void nfs4_init_once(struct nfs_inode *nfsi)
{
B
Bryan Schumaker 已提交
1673
#if IS_ENABLED(CONFIG_NFS_V4)
A
Andrew Morton 已提交
1674 1675 1676 1677
	INIT_LIST_HEAD(&nfsi->open_states);
	nfsi->delegation = NULL;
	nfsi->delegation_state = 0;
	init_rwsem(&nfsi->rwsem);
1678
	nfsi->layout = NULL;
A
Andrew Morton 已提交
1679 1680
#endif
}
D
David Howells 已提交
1681

1682
static void init_once(void *foo)
L
Linus Torvalds 已提交
1683 1684 1685
{
	struct nfs_inode *nfsi = (struct nfs_inode *) foo;

C
Christoph Lameter 已提交
1686 1687 1688 1689
	inode_init_once(&nfsi->vfs_inode);
	INIT_LIST_HEAD(&nfsi->open_files);
	INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
	INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
F
Fred Isaman 已提交
1690
	INIT_LIST_HEAD(&nfsi->commit_info.list);
C
Christoph Lameter 已提交
1691
	nfsi->npages = 0;
F
Fred Isaman 已提交
1692
	nfsi->commit_info.ncommit = 0;
1693
	atomic_set(&nfsi->commit_info.rpcs_out, 0);
T
Trond Myklebust 已提交
1694 1695 1696
	atomic_set(&nfsi->silly_count, 1);
	INIT_HLIST_HEAD(&nfsi->silly_list);
	init_waitqueue_head(&nfsi->waitqueue);
C
Christoph Lameter 已提交
1697
	nfs4_init_once(nfsi);
L
Linus Torvalds 已提交
1698
}
1699

D
David Howells 已提交
1700
static int __init nfs_init_inodecache(void)
L
Linus Torvalds 已提交
1701 1702 1703
{
	nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
					     sizeof(struct nfs_inode),
1704 1705
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
1706
					     init_once);
L
Linus Torvalds 已提交
1707 1708 1709 1710 1711 1712
	if (nfs_inode_cachep == NULL)
		return -ENOMEM;

	return 0;
}

1713
static void nfs_destroy_inodecache(void)
L
Linus Torvalds 已提交
1714
{
1715 1716 1717 1718 1719
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
1720
	kmem_cache_destroy(nfs_inode_cachep);
L
Linus Torvalds 已提交
1721 1722
}

T
Trond Myklebust 已提交
1723
struct workqueue_struct *nfsiod_workqueue;
B
Bryan Schumaker 已提交
1724
EXPORT_SYMBOL_GPL(nfsiod_workqueue);
T
Trond Myklebust 已提交
1725 1726 1727 1728 1729 1730 1731 1732

/*
 * start up the nfsiod workqueue
 */
static int nfsiod_start(void)
{
	struct workqueue_struct *wq;
	dprintk("RPC:       creating workqueue nfsiod\n");
1733
	wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
T
Trond Myklebust 已提交
1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753
	if (wq == NULL)
		return -ENOMEM;
	nfsiod_workqueue = wq;
	return 0;
}

/*
 * Destroy the nfsiod workqueue
 */
static void nfsiod_stop(void)
{
	struct workqueue_struct *wq;

	wq = nfsiod_workqueue;
	if (wq == NULL)
		return;
	nfsiod_workqueue = NULL;
	destroy_workqueue(wq);
}

1754
int nfs_net_id;
1755
EXPORT_SYMBOL_GPL(nfs_net_id);
1756 1757 1758

static int nfs_net_init(struct net *net)
{
1759
	nfs_clients_init(net);
1760
	return 0;
1761 1762 1763 1764
}

static void nfs_net_exit(struct net *net)
{
1765
	nfs_cleanup_cb_ident_idr(net);
1766 1767 1768 1769 1770 1771 1772 1773 1774
}

static struct pernet_operations nfs_net_ops = {
	.init = nfs_net_init,
	.exit = nfs_net_exit,
	.id   = &nfs_net_id,
	.size = sizeof(struct nfs_net),
};

L
Linus Torvalds 已提交
1775 1776 1777 1778 1779 1780 1781
/*
 * Initialize NFS
 */
static int __init init_nfs_fs(void)
{
	int err;

1782
	err = register_pernet_subsys(&nfs_net_ops);
1783
	if (err < 0)
B
Bryan Schumaker 已提交
1784
		goto out9;
1785

1786 1787
	err = nfs_fscache_register();
	if (err < 0)
B
Bryan Schumaker 已提交
1788
		goto out8;
1789

T
Trond Myklebust 已提交
1790 1791
	err = nfsiod_start();
	if (err)
B
Bryan Schumaker 已提交
1792
		goto out7;
T
Trond Myklebust 已提交
1793

1794 1795
	err = nfs_fs_proc_init();
	if (err)
B
Bryan Schumaker 已提交
1796
		goto out6;
1797

L
Linus Torvalds 已提交
1798 1799
	err = nfs_init_nfspagecache();
	if (err)
B
Bryan Schumaker 已提交
1800
		goto out5;
L
Linus Torvalds 已提交
1801 1802 1803

	err = nfs_init_inodecache();
	if (err)
B
Bryan Schumaker 已提交
1804
		goto out4;
L
Linus Torvalds 已提交
1805 1806 1807

	err = nfs_init_readpagecache();
	if (err)
B
Bryan Schumaker 已提交
1808
		goto out3;
L
Linus Torvalds 已提交
1809 1810 1811

	err = nfs_init_writepagecache();
	if (err)
B
Bryan Schumaker 已提交
1812
		goto out2;
L
Linus Torvalds 已提交
1813 1814 1815

	err = nfs_init_directcache();
	if (err)
B
Bryan Schumaker 已提交
1816
		goto out1;
L
Linus Torvalds 已提交
1817 1818

#ifdef CONFIG_PROC_FS
1819
	rpc_proc_register(&init_net, &nfs_rpcstat);
L
Linus Torvalds 已提交
1820
#endif
D
David Howells 已提交
1821
	if ((err = register_nfs_fs()) != 0)
1822 1823
		goto out0;

L
Linus Torvalds 已提交
1824
	return 0;
1825
out0:
L
Linus Torvalds 已提交
1826
#ifdef CONFIG_PROC_FS
1827
	rpc_proc_unregister(&init_net, "nfs");
L
Linus Torvalds 已提交
1828 1829
#endif
	nfs_destroy_directcache();
B
Bryan Schumaker 已提交
1830
out1:
1831
	nfs_destroy_writepagecache();
B
Bryan Schumaker 已提交
1832
out2:
1833
	nfs_destroy_readpagecache();
B
Bryan Schumaker 已提交
1834
out3:
1835
	nfs_destroy_inodecache();
B
Bryan Schumaker 已提交
1836
out4:
1837
	nfs_destroy_nfspagecache();
B
Bryan Schumaker 已提交
1838
out5:
1839
	nfs_fs_proc_exit();
B
Bryan Schumaker 已提交
1840
out6:
1841
	nfsiod_stop();
B
Bryan Schumaker 已提交
1842
out7:
1843
	nfs_fscache_unregister();
B
Bryan Schumaker 已提交
1844
out8:
1845
	unregister_pernet_subsys(&nfs_net_ops);
B
Bryan Schumaker 已提交
1846
out9:
L
Linus Torvalds 已提交
1847 1848 1849 1850 1851 1852 1853 1854 1855 1856
	return err;
}

static void __exit exit_nfs_fs(void)
{
	nfs_destroy_directcache();
	nfs_destroy_writepagecache();
	nfs_destroy_readpagecache();
	nfs_destroy_inodecache();
	nfs_destroy_nfspagecache();
1857
	nfs_fscache_unregister();
1858
	unregister_pernet_subsys(&nfs_net_ops);
L
Linus Torvalds 已提交
1859
#ifdef CONFIG_PROC_FS
1860
	rpc_proc_unregister(&init_net, "nfs");
L
Linus Torvalds 已提交
1861
#endif
D
David Howells 已提交
1862
	unregister_nfs_fs();
1863
	nfs_fs_proc_exit();
T
Trond Myklebust 已提交
1864
	nfsiod_stop();
L
Linus Torvalds 已提交
1865 1866 1867 1868 1869
}

/* Not quite true; I just maintain it */
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
MODULE_LICENSE("GPL");
1870
module_param(enable_ino64, bool, 0644);
L
Linus Torvalds 已提交
1871 1872 1873

module_init(init_nfs_fs)
module_exit(exit_nfs_fs)