mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
f174ff7a0a
This helper will allow to find an existing NFS inode by the file handle and fattr. Signed-off-by: Peng Tao <tao.peng@primarydata.com> [hch: split from a larger patch] Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2193 lines
59 KiB
C
2193 lines
59 KiB
C
/*
|
|
* linux/fs/nfs/inode.c
|
|
*
|
|
* Copyright (C) 1992 Rick Sladkey
|
|
*
|
|
* nfs inode and superblock handling functions
|
|
*
|
|
* Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
|
|
* 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>
|
|
#include <linux/sched/signal.h>
|
|
#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>
|
|
#include <linux/sunrpc/metrics.h>
|
|
#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>
|
|
#include <linux/inet.h>
|
|
#include <linux/nfs_xdr.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/freezer.h>
|
|
|
|
#include <linux/uaccess.h>
|
|
|
|
#include "nfs4_fs.h"
|
|
#include "callback.h"
|
|
#include "delegation.h"
|
|
#include "iostat.h"
|
|
#include "internal.h"
|
|
#include "fscache.h"
|
|
#include "pnfs.h"
|
|
#include "nfs.h"
|
|
#include "netns.h"
|
|
|
|
#include "nfstrace.h"
|
|
|
|
#define NFSDBG_FACILITY NFSDBG_VFS
|
|
|
|
#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
|
|
|
|
/* Default is to see 64-bit inode numbers */
|
|
static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
|
|
|
|
static void nfs_invalidate_inode(struct inode *);
|
|
static int nfs_update_inode(struct inode *, struct nfs_fattr *);
|
|
|
|
static struct kmem_cache * nfs_inode_cachep;
|
|
|
|
static inline unsigned long
|
|
nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
|
|
{
|
|
return nfs_fileid_to_ino_t(fattr->fileid);
|
|
}
|
|
|
|
static int nfs_wait_killable(int mode)
|
|
{
|
|
freezable_schedule_unsafe();
|
|
if (signal_pending_state(mode, current))
|
|
return -ERESTARTSYS;
|
|
return 0;
|
|
}
|
|
|
|
int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
|
|
{
|
|
return nfs_wait_killable(mode);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
|
|
|
|
int nfs_wait_atomic_killable(atomic_t *p)
|
|
{
|
|
return nfs_wait_killable(TASK_KILLABLE);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
#ifdef CONFIG_COMPAT
|
|
compat_ulong_t ino;
|
|
#else
|
|
unsigned long ino;
|
|
#endif
|
|
|
|
if (enable_ino64)
|
|
return fileid;
|
|
ino = fileid;
|
|
if (sizeof(ino) < sizeof(fileid))
|
|
ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
|
|
return ino;
|
|
}
|
|
|
|
int nfs_drop_inode(struct inode *inode)
|
|
{
|
|
return NFS_STALE(inode) || generic_drop_inode(inode);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_drop_inode);
|
|
|
|
void nfs_clear_inode(struct inode *inode)
|
|
{
|
|
/*
|
|
* The following should never happen...
|
|
*/
|
|
WARN_ON_ONCE(nfs_have_writebacks(inode));
|
|
WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
|
|
nfs_zap_acl_cache(inode);
|
|
nfs_access_zap_cache(inode);
|
|
nfs_fscache_clear_inode(inode);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_clear_inode);
|
|
|
|
void nfs_evict_inode(struct inode *inode)
|
|
{
|
|
truncate_inode_pages_final(&inode->i_data);
|
|
clear_inode(inode);
|
|
nfs_clear_inode(inode);
|
|
}
|
|
|
|
int nfs_sync_inode(struct inode *inode)
|
|
{
|
|
inode_dio_wait(inode);
|
|
return nfs_wb_all(inode);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_sync_inode);
|
|
|
|
/**
|
|
* nfs_sync_mapping - helper to flush all mmapped dirty data to disk
|
|
*/
|
|
int nfs_sync_mapping(struct address_space *mapping)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (mapping->nrpages != 0) {
|
|
unmap_mapping_range(mapping, 0, 0, 0);
|
|
ret = nfs_wb_all(mapping->host);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int nfs_attribute_timeout(struct inode *inode)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
|
|
}
|
|
|
|
static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
|
|
{
|
|
unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
|
|
|
|
/* Special case for the pagecache or access cache */
|
|
if (flags == NFS_INO_REVAL_PAGECACHE &&
|
|
!(cache_validity & NFS_INO_REVAL_FORCED))
|
|
return false;
|
|
return (cache_validity & flags) != 0;
|
|
}
|
|
|
|
static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
|
|
{
|
|
unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
|
|
|
|
if ((cache_validity & flags) != 0)
|
|
return true;
|
|
if (nfs_attribute_timeout(inode))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
|
|
{
|
|
if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
|
|
return nfs_check_cache_invalid_delegated(inode, flags);
|
|
|
|
return nfs_check_cache_invalid_not_delegated(inode, flags);
|
|
}
|
|
|
|
static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
if (inode->i_mapping->nrpages == 0)
|
|
flags &= ~NFS_INO_INVALID_DATA;
|
|
nfsi->cache_validity |= flags;
|
|
if (flags & NFS_INO_INVALID_DATA)
|
|
nfs_fscache_invalidate(inode);
|
|
}
|
|
|
|
/*
|
|
* Invalidate the local caches
|
|
*/
|
|
static void nfs_zap_caches_locked(struct inode *inode)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
int mode = inode->i_mode;
|
|
|
|
nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
|
|
|
|
nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
|
|
nfsi->attrtimeo_timestamp = jiffies;
|
|
|
|
memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
|
|
if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
|
|
| NFS_INO_INVALID_DATA
|
|
| NFS_INO_INVALID_ACCESS
|
|
| NFS_INO_INVALID_ACL
|
|
| NFS_INO_REVAL_PAGECACHE);
|
|
} else
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
|
|
| NFS_INO_INVALID_ACCESS
|
|
| NFS_INO_INVALID_ACL
|
|
| NFS_INO_REVAL_PAGECACHE);
|
|
nfs_zap_label_cache_locked(nfsi);
|
|
}
|
|
|
|
void nfs_zap_caches(struct inode *inode)
|
|
{
|
|
spin_lock(&inode->i_lock);
|
|
nfs_zap_caches_locked(inode);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
|
|
{
|
|
if (mapping->nrpages != 0) {
|
|
spin_lock(&inode->i_lock);
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
}
|
|
|
|
void nfs_zap_acl_cache(struct inode *inode)
|
|
{
|
|
void (*clear_acl_cache)(struct inode *);
|
|
|
|
clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
|
|
if (clear_acl_cache != NULL)
|
|
clear_acl_cache(inode);
|
|
spin_lock(&inode->i_lock);
|
|
NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
|
|
|
|
void nfs_invalidate_atime(struct inode *inode)
|
|
{
|
|
spin_lock(&inode->i_lock);
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
|
|
|
|
/*
|
|
* Invalidate, but do not unhash, the inode.
|
|
* NB: must be called with inode->i_lock held!
|
|
*/
|
|
static void nfs_invalidate_inode(struct inode *inode)
|
|
{
|
|
set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
|
|
nfs_zap_caches_locked(inode);
|
|
}
|
|
|
|
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;
|
|
if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
|
|
return 0;
|
|
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;
|
|
|
|
set_nfs_fileid(inode, fattr->fileid);
|
|
inode->i_mode = fattr->mode;
|
|
nfs_copy_fh(NFS_FH(inode), desc->fh);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
|
|
static void nfs_clear_label_invalid(struct inode *inode)
|
|
{
|
|
spin_lock(&inode->i_lock);
|
|
NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
|
|
struct nfs4_label *label)
|
|
{
|
|
int error;
|
|
|
|
if (label == NULL)
|
|
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);
|
|
nfs_clear_label_invalid(inode);
|
|
}
|
|
}
|
|
|
|
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);
|
|
#else
|
|
void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
|
|
struct nfs4_label *label)
|
|
{
|
|
}
|
|
#endif
|
|
EXPORT_SYMBOL_GPL(nfs_setsecurity);
|
|
|
|
/* Search for inode identified by fh, fileid and i_mode in inode cache. */
|
|
struct inode *
|
|
nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
|
|
{
|
|
struct nfs_find_desc desc = {
|
|
.fh = fh,
|
|
.fattr = fattr,
|
|
};
|
|
struct inode *inode;
|
|
unsigned long hash;
|
|
|
|
if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
|
|
!(fattr->valid & NFS_ATTR_FATTR_TYPE))
|
|
return NULL;
|
|
|
|
hash = nfs_fattr_to_ino_t(fattr);
|
|
inode = ilookup5(sb, hash, nfs_find_actor, &desc);
|
|
|
|
dprintk("%s: returning %p\n", __func__, inode);
|
|
return inode;
|
|
}
|
|
|
|
/*
|
|
* This is our front-end to iget that looks up inodes by file handle
|
|
* instead of inode number.
|
|
*/
|
|
struct inode *
|
|
nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
|
|
{
|
|
struct nfs_find_desc desc = {
|
|
.fh = fh,
|
|
.fattr = fattr
|
|
};
|
|
struct inode *inode = ERR_PTR(-ENOENT);
|
|
unsigned long hash;
|
|
|
|
nfs_attr_check_mountpoint(sb, fattr);
|
|
|
|
if (nfs_attr_use_mounted_on_fileid(fattr))
|
|
fattr->fileid = fattr->mounted_on_fileid;
|
|
else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
|
|
goto out_no_inode;
|
|
if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
|
|
goto out_no_inode;
|
|
|
|
hash = nfs_fattr_to_ino_t(fattr);
|
|
|
|
inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
|
|
if (inode == NULL) {
|
|
inode = ERR_PTR(-ENOMEM);
|
|
goto out_no_inode;
|
|
}
|
|
|
|
if (inode->i_state & I_NEW) {
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
unsigned long now = jiffies;
|
|
|
|
/* 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;
|
|
if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
|
|
&& nfs_server_capable(inode, NFS_CAP_MODE))
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
|
|
/* Why so? Because we want revalidate for devices/FIFOs, and
|
|
* that's precisely what we have in nfs_file_inode_operations.
|
|
*/
|
|
inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
|
|
if (S_ISREG(inode->i_mode)) {
|
|
inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
|
|
inode->i_data.a_ops = &nfs_file_aops;
|
|
} else if (S_ISDIR(inode->i_mode)) {
|
|
inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
|
|
inode->i_fop = &nfs_dir_operations;
|
|
inode->i_data.a_ops = &nfs_dir_aops;
|
|
/* Deal with crossing mountpoints */
|
|
if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
|
|
fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
|
|
if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
|
|
inode->i_op = &nfs_referral_inode_operations;
|
|
else
|
|
inode->i_op = &nfs_mountpoint_inode_operations;
|
|
inode->i_fop = NULL;
|
|
inode->i_flags |= S_AUTOMOUNT;
|
|
}
|
|
} else if (S_ISLNK(inode->i_mode)) {
|
|
inode->i_op = &nfs_symlink_inode_operations;
|
|
inode_nohighmem(inode);
|
|
} else
|
|
init_special_inode(inode, inode->i_mode, fattr->rdev);
|
|
|
|
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));
|
|
inode->i_version = 0;
|
|
inode->i_size = 0;
|
|
clear_nlink(inode);
|
|
inode->i_uid = make_kuid(&init_user_ns, -2);
|
|
inode->i_gid = make_kgid(&init_user_ns, -2);
|
|
inode->i_blocks = 0;
|
|
memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
|
|
nfsi->write_io = 0;
|
|
nfsi->read_io = 0;
|
|
|
|
nfsi->read_cache_jiffies = fattr->time_start;
|
|
nfsi->attr_gencount = fattr->gencount;
|
|
if (fattr->valid & NFS_ATTR_FATTR_ATIME)
|
|
inode->i_atime = fattr->atime;
|
|
else if (nfs_server_capable(inode, NFS_CAP_ATIME))
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
|
|
if (fattr->valid & NFS_ATTR_FATTR_MTIME)
|
|
inode->i_mtime = fattr->mtime;
|
|
else if (nfs_server_capable(inode, NFS_CAP_MTIME))
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
|
|
if (fattr->valid & NFS_ATTR_FATTR_CTIME)
|
|
inode->i_ctime = fattr->ctime;
|
|
else if (nfs_server_capable(inode, NFS_CAP_CTIME))
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
|
|
if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
|
|
inode->i_version = fattr->change_attr;
|
|
else
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
|
|
| NFS_INO_REVAL_PAGECACHE);
|
|
if (fattr->valid & NFS_ATTR_FATTR_SIZE)
|
|
inode->i_size = nfs_size_to_loff_t(fattr->size);
|
|
else
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
|
|
| NFS_INO_REVAL_PAGECACHE);
|
|
if (fattr->valid & NFS_ATTR_FATTR_NLINK)
|
|
set_nlink(inode, fattr->nlink);
|
|
else if (nfs_server_capable(inode, NFS_CAP_NLINK))
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
|
|
if (fattr->valid & NFS_ATTR_FATTR_OWNER)
|
|
inode->i_uid = fattr->uid;
|
|
else if (nfs_server_capable(inode, NFS_CAP_OWNER))
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
|
|
if (fattr->valid & NFS_ATTR_FATTR_GROUP)
|
|
inode->i_gid = fattr->gid;
|
|
else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
|
|
if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
|
|
inode->i_blocks = fattr->du.nfs2.blocks;
|
|
if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
|
|
/*
|
|
* report the blocks in 512byte units
|
|
*/
|
|
inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
|
|
}
|
|
|
|
nfs_setsecurity(inode, fattr, label);
|
|
|
|
nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
|
|
nfsi->attrtimeo_timestamp = now;
|
|
nfsi->access_cache = RB_ROOT;
|
|
|
|
nfs_fscache_init_inode(inode);
|
|
|
|
unlock_new_inode(inode);
|
|
} else {
|
|
int err = nfs_refresh_inode(inode, fattr);
|
|
if (err < 0) {
|
|
iput(inode);
|
|
inode = ERR_PTR(err);
|
|
goto out_no_inode;
|
|
}
|
|
}
|
|
dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
|
|
inode->i_sb->s_id,
|
|
(unsigned long long)NFS_FILEID(inode),
|
|
nfs_display_fhandle_hash(fh),
|
|
atomic_read(&inode->i_count));
|
|
|
|
out:
|
|
return inode;
|
|
|
|
out_no_inode:
|
|
dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_fhget);
|
|
|
|
#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)
|
|
|
|
int
|
|
nfs_setattr(struct dentry *dentry, struct iattr *attr)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
struct nfs_fattr *fattr;
|
|
int error = 0;
|
|
|
|
nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
|
|
|
|
/* 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;
|
|
|
|
if (attr->ia_valid & ATTR_SIZE) {
|
|
BUG_ON(!S_ISREG(inode->i_mode));
|
|
|
|
error = inode_newsize_ok(inode, attr->ia_size);
|
|
if (error)
|
|
return error;
|
|
|
|
if (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;
|
|
if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
|
|
return 0;
|
|
|
|
trace_nfs_setattr_enter(inode);
|
|
|
|
/* Write all dirty data */
|
|
if (S_ISREG(inode->i_mode))
|
|
nfs_sync_inode(inode);
|
|
|
|
fattr = nfs_alloc_fattr();
|
|
if (fattr == NULL) {
|
|
error = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Return any delegations if we're going to change ACLs
|
|
*/
|
|
if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
|
|
NFS_PROTO(inode)->return_delegation(inode);
|
|
error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
|
|
if (error == 0)
|
|
error = nfs_refresh_inode(inode, fattr);
|
|
nfs_free_fattr(fattr);
|
|
out:
|
|
trace_nfs_setattr_exit(inode, error);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_setattr);
|
|
|
|
/**
|
|
* 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.
|
|
* Note: must be called with inode->i_lock held!
|
|
*/
|
|
static int nfs_vmtruncate(struct inode * inode, loff_t offset)
|
|
{
|
|
int err;
|
|
|
|
err = inode_newsize_ok(inode, offset);
|
|
if (err)
|
|
goto out;
|
|
|
|
i_size_write(inode, offset);
|
|
/* Optimisation */
|
|
if (offset == 0)
|
|
NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
truncate_pagecache(inode, offset);
|
|
spin_lock(&inode->i_lock);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* 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,
|
|
struct nfs_fattr *fattr)
|
|
{
|
|
/* Barrier: bump the attribute generation count. */
|
|
nfs_fattr_set_barrier(fattr);
|
|
|
|
spin_lock(&inode->i_lock);
|
|
NFS_I(inode)->attr_gencount = fattr->gencount;
|
|
if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
|
|
if ((attr->ia_valid & ATTR_MODE) != 0) {
|
|
int mode = attr->ia_mode & S_IALLUGO;
|
|
mode |= inode->i_mode & ~S_IALLUGO;
|
|
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;
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
|
|
| NFS_INO_INVALID_ACL);
|
|
}
|
|
if ((attr->ia_valid & ATTR_SIZE) != 0) {
|
|
nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
|
|
nfs_vmtruncate(inode, attr->ia_size);
|
|
}
|
|
if (fattr->valid)
|
|
nfs_update_inode(inode, fattr);
|
|
else
|
|
NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
|
|
|
|
static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
|
|
{
|
|
struct dentry *parent;
|
|
|
|
if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
|
|
return;
|
|
parent = dget_parent(dentry);
|
|
nfs_force_use_readdirplus(d_inode(parent));
|
|
dput(parent);
|
|
}
|
|
|
|
static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
|
|
{
|
|
struct dentry *parent;
|
|
|
|
if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
|
|
return;
|
|
parent = dget_parent(dentry);
|
|
nfs_advise_use_readdirplus(d_inode(parent));
|
|
dput(parent);
|
|
}
|
|
|
|
static bool nfs_need_revalidate_inode(struct inode *inode)
|
|
{
|
|
if (NFS_I(inode)->cache_validity &
|
|
(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
|
|
return true;
|
|
if (nfs_attribute_cache_expired(inode))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
int nfs_getattr(const struct path *path, struct kstat *stat,
|
|
u32 request_mask, unsigned int query_flags)
|
|
{
|
|
struct inode *inode = d_inode(path->dentry);
|
|
int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
|
|
int err = 0;
|
|
|
|
trace_nfs_getattr_enter(inode);
|
|
/* Flush out writes to the server in order to update c/mtime. */
|
|
if (S_ISREG(inode->i_mode)) {
|
|
err = filemap_write_and_wait(inode->i_mapping);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 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 ((path->mnt->mnt_flags & MNT_NOATIME) ||
|
|
((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
|
|
need_atime = 0;
|
|
|
|
if (need_atime || nfs_need_revalidate_inode(inode)) {
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
|
|
if (!(server->flags & NFS_MOUNT_NOAC))
|
|
nfs_readdirplus_parent_cache_miss(path->dentry);
|
|
else
|
|
nfs_readdirplus_parent_cache_hit(path->dentry);
|
|
err = __nfs_revalidate_inode(server, inode);
|
|
} else
|
|
nfs_readdirplus_parent_cache_hit(path->dentry);
|
|
if (!err) {
|
|
generic_fillattr(inode, stat);
|
|
stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
|
|
if (S_ISDIR(inode->i_mode))
|
|
stat->blksize = NFS_SERVER(inode)->dtsize;
|
|
}
|
|
out:
|
|
trace_nfs_getattr_exit(inode, err);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_getattr);
|
|
|
|
static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
|
|
{
|
|
atomic_set(&l_ctx->count, 1);
|
|
l_ctx->lockowner = current->files;
|
|
INIT_LIST_HEAD(&l_ctx->list);
|
|
atomic_set(&l_ctx->io_count, 0);
|
|
}
|
|
|
|
static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
|
|
{
|
|
struct nfs_lock_context *head = &ctx->lock_context;
|
|
struct nfs_lock_context *pos = head;
|
|
|
|
do {
|
|
if (pos->lockowner != current->files)
|
|
continue;
|
|
atomic_inc(&pos->count);
|
|
return pos;
|
|
} while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
|
|
return NULL;
|
|
}
|
|
|
|
struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
|
|
{
|
|
struct nfs_lock_context *res, *new = NULL;
|
|
struct inode *inode = d_inode(ctx->dentry);
|
|
|
|
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)
|
|
return ERR_PTR(-ENOMEM);
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_get_lock_context);
|
|
|
|
void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
|
|
{
|
|
struct nfs_open_context *ctx = l_ctx->open_context;
|
|
struct inode *inode = d_inode(ctx->dentry);
|
|
|
|
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);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_put_lock_context);
|
|
|
|
/**
|
|
* nfs_close_context - Common close_context() routine NFSv2/v3
|
|
* @ctx: pointer to context
|
|
* @is_sync: is this a synchronous close
|
|
*
|
|
* Ensure that the attributes are up to date if we're mounted
|
|
* with close-to-open semantics and we have cached data that will
|
|
* need to be revalidated on open.
|
|
*/
|
|
void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
|
|
{
|
|
struct nfs_inode *nfsi;
|
|
struct inode *inode;
|
|
struct nfs_server *server;
|
|
|
|
if (!(ctx->mode & FMODE_WRITE))
|
|
return;
|
|
if (!is_sync)
|
|
return;
|
|
inode = d_inode(ctx->dentry);
|
|
if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
|
|
return;
|
|
nfsi = NFS_I(inode);
|
|
if (inode->i_mapping->nrpages == 0)
|
|
return;
|
|
if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
|
|
return;
|
|
if (!list_empty(&nfsi->open_files))
|
|
return;
|
|
server = NFS_SERVER(inode);
|
|
if (server->flags & NFS_MOUNT_NOCTO)
|
|
return;
|
|
nfs_revalidate_inode(server, inode);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_close_context);
|
|
|
|
struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
|
|
fmode_t f_mode,
|
|
struct file *filp)
|
|
{
|
|
struct nfs_open_context *ctx;
|
|
struct rpc_cred *cred = rpc_lookup_cred();
|
|
if (IS_ERR(cred))
|
|
return ERR_CAST(cred);
|
|
|
|
ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
|
|
if (!ctx) {
|
|
put_rpccred(cred);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
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;
|
|
ctx->flock_owner = (fl_owner_t)filp;
|
|
nfs_init_lock_context(&ctx->lock_context);
|
|
ctx->lock_context.open_context = ctx;
|
|
INIT_LIST_HEAD(&ctx->list);
|
|
ctx->mdsthreshold = NULL;
|
|
return ctx;
|
|
}
|
|
EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
|
|
|
|
struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
|
|
{
|
|
if (ctx != NULL)
|
|
atomic_inc(&ctx->lock_context.count);
|
|
return ctx;
|
|
}
|
|
EXPORT_SYMBOL_GPL(get_nfs_open_context);
|
|
|
|
static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
|
|
{
|
|
struct inode *inode = d_inode(ctx->dentry);
|
|
struct super_block *sb = ctx->dentry->d_sb;
|
|
|
|
if (!list_empty(&ctx->list)) {
|
|
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))
|
|
return;
|
|
if (inode != NULL)
|
|
NFS_PROTO(inode)->close_context(ctx, is_sync);
|
|
if (ctx->cred != NULL)
|
|
put_rpccred(ctx->cred);
|
|
dput(ctx->dentry);
|
|
nfs_sb_deactive(sb);
|
|
kfree(ctx->mdsthreshold);
|
|
kfree(ctx);
|
|
}
|
|
|
|
void put_nfs_open_context(struct nfs_open_context *ctx)
|
|
{
|
|
__put_nfs_open_context(ctx, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(put_nfs_open_context);
|
|
|
|
static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
|
|
{
|
|
__put_nfs_open_context(ctx, 1);
|
|
}
|
|
|
|
/*
|
|
* Ensure that mmap has a recent RPC credential for use when writing out
|
|
* shared pages
|
|
*/
|
|
void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
|
|
{
|
|
struct inode *inode = d_inode(ctx->dentry);
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
spin_lock(&inode->i_lock);
|
|
if (ctx->mode & FMODE_WRITE)
|
|
list_add(&ctx->list, &nfsi->open_files);
|
|
else
|
|
list_add_tail(&ctx->list, &nfsi->open_files);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
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);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
|
|
|
|
/*
|
|
* Given an inode, search for an open context with the desired characteristics
|
|
*/
|
|
struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
|
|
{
|
|
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) {
|
|
if (cred != NULL && pos->cred != cred)
|
|
continue;
|
|
if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
|
|
continue;
|
|
ctx = get_nfs_open_context(pos);
|
|
break;
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
return ctx;
|
|
}
|
|
|
|
void nfs_file_clear_open_context(struct file *filp)
|
|
{
|
|
struct nfs_open_context *ctx = nfs_file_open_context(filp);
|
|
|
|
if (ctx) {
|
|
struct inode *inode = d_inode(ctx->dentry);
|
|
|
|
/*
|
|
* We fatal error on write before. Try to writeback
|
|
* every page again.
|
|
*/
|
|
if (ctx->error < 0)
|
|
invalidate_inode_pages2(inode->i_mapping);
|
|
filp->private_data = NULL;
|
|
spin_lock(&inode->i_lock);
|
|
list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
|
|
spin_unlock(&inode->i_lock);
|
|
put_nfs_open_context_sync(ctx);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* These allocate and release file read/write context information.
|
|
*/
|
|
int nfs_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct nfs_open_context *ctx;
|
|
|
|
ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
|
|
if (IS_ERR(ctx))
|
|
return PTR_ERR(ctx);
|
|
nfs_file_set_open_context(filp, ctx);
|
|
put_nfs_open_context(ctx);
|
|
nfs_fscache_open_file(inode, 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;
|
|
struct nfs4_label *label = NULL;
|
|
struct nfs_fattr *fattr = NULL;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
|
|
inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
|
|
|
|
trace_nfs_revalidate_inode_enter(inode);
|
|
|
|
if (is_bad_inode(inode))
|
|
goto out;
|
|
if (NFS_STALE(inode))
|
|
goto out;
|
|
|
|
/* pNFS: Attributes aren't updated until we layoutcommit */
|
|
if (S_ISREG(inode->i_mode)) {
|
|
status = pnfs_sync_inode(inode, false);
|
|
if (status)
|
|
goto out;
|
|
}
|
|
|
|
status = -ENOMEM;
|
|
fattr = nfs_alloc_fattr();
|
|
if (fattr == NULL)
|
|
goto out;
|
|
|
|
nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
|
|
|
|
label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
|
|
if (IS_ERR(label)) {
|
|
status = PTR_ERR(label);
|
|
goto out;
|
|
}
|
|
|
|
status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
|
|
if (status != 0) {
|
|
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
|
|
inode->i_sb->s_id,
|
|
(unsigned long long)NFS_FILEID(inode), status);
|
|
if (status == -ESTALE) {
|
|
nfs_zap_caches(inode);
|
|
if (!S_ISDIR(inode->i_mode))
|
|
set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
|
|
}
|
|
goto err_out;
|
|
}
|
|
|
|
status = nfs_refresh_inode(inode, fattr);
|
|
if (status) {
|
|
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
|
|
inode->i_sb->s_id,
|
|
(unsigned long long)NFS_FILEID(inode), status);
|
|
goto err_out;
|
|
}
|
|
|
|
if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
|
|
nfs_zap_acl_cache(inode);
|
|
|
|
nfs_setsecurity(inode, fattr, label);
|
|
|
|
dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
|
|
inode->i_sb->s_id,
|
|
(unsigned long long)NFS_FILEID(inode));
|
|
|
|
err_out:
|
|
nfs4_label_free(label);
|
|
out:
|
|
nfs_free_fattr(fattr);
|
|
trace_nfs_revalidate_inode_exit(inode, status);
|
|
return status;
|
|
}
|
|
|
|
int nfs_attribute_cache_expired(struct inode *inode)
|
|
{
|
|
if (nfs_have_delegated_attributes(inode))
|
|
return 0;
|
|
return nfs_attribute_timeout(inode);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
if (!nfs_need_revalidate_inode(inode))
|
|
return NFS_STALE(inode) ? -ESTALE : 0;
|
|
return __nfs_revalidate_inode(server, inode);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
|
|
|
|
static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
int ret;
|
|
|
|
if (mapping->nrpages != 0) {
|
|
if (S_ISREG(inode->i_mode)) {
|
|
unmap_mapping_range(mapping, 0, 0, 0);
|
|
ret = nfs_sync_mapping(mapping);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
ret = invalidate_inode_pages2(mapping);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
spin_lock(&inode->i_lock);
|
|
memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
|
|
nfs_fscache_wait_on_invalidate(inode);
|
|
|
|
dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
|
|
inode->i_sb->s_id,
|
|
(unsigned long long)NFS_FILEID(inode));
|
|
return 0;
|
|
}
|
|
|
|
bool nfs_mapping_need_revalidate_inode(struct inode *inode)
|
|
{
|
|
return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
|
|
NFS_STALE(inode);
|
|
}
|
|
|
|
int nfs_revalidate_mapping_rcu(struct inode *inode)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
unsigned long *bitlock = &nfsi->flags;
|
|
int ret = 0;
|
|
|
|
if (IS_SWAPFILE(inode))
|
|
goto out;
|
|
if (nfs_mapping_need_revalidate_inode(inode)) {
|
|
ret = -ECHILD;
|
|
goto out;
|
|
}
|
|
spin_lock(&inode->i_lock);
|
|
if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
|
|
(nfsi->cache_validity & NFS_INO_INVALID_DATA))
|
|
ret = -ECHILD;
|
|
spin_unlock(&inode->i_lock);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
unsigned long *bitlock = &nfsi->flags;
|
|
int ret = 0;
|
|
|
|
/* swapfiles are not supposed to be shared. */
|
|
if (IS_SWAPFILE(inode))
|
|
goto out;
|
|
|
|
if (nfs_mapping_need_revalidate_inode(inode)) {
|
|
ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* We must clear NFS_INO_INVALID_DATA first to ensure that
|
|
* invalidations that come in while we're shooting down the mappings
|
|
* are respected. But, that leaves a race window where one revalidator
|
|
* can clear the flag, and then another checks it before the mapping
|
|
* gets invalidated. Fix that by serializing access to this part of
|
|
* the function.
|
|
*
|
|
* At the same time, we need to allow other tasks to see whether we
|
|
* might be in the middle of invalidating the pages, so we only set
|
|
* the bit lock here if it looks like we're going to be doing that.
|
|
*/
|
|
for (;;) {
|
|
ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
|
|
nfs_wait_bit_killable, TASK_KILLABLE);
|
|
if (ret)
|
|
goto out;
|
|
spin_lock(&inode->i_lock);
|
|
if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
|
|
spin_unlock(&inode->i_lock);
|
|
continue;
|
|
}
|
|
if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
|
|
break;
|
|
spin_unlock(&inode->i_lock);
|
|
goto out;
|
|
}
|
|
|
|
set_bit(NFS_INO_INVALIDATING, bitlock);
|
|
smp_wmb();
|
|
nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
|
|
spin_unlock(&inode->i_lock);
|
|
trace_nfs_invalidate_mapping_enter(inode);
|
|
ret = nfs_invalidate_mapping(inode, mapping);
|
|
trace_nfs_invalidate_mapping_exit(inode, ret);
|
|
|
|
clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
|
|
smp_mb__after_atomic();
|
|
wake_up_bit(bitlock, NFS_INO_INVALIDATING);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static bool nfs_file_has_writers(struct nfs_inode *nfsi)
|
|
{
|
|
struct inode *inode = &nfsi->vfs_inode;
|
|
|
|
assert_spin_locked(&inode->i_lock);
|
|
|
|
if (!S_ISREG(inode->i_mode))
|
|
return false;
|
|
if (list_empty(&nfsi->open_files))
|
|
return false;
|
|
/* Note: This relies on nfsi->open_files being ordered with writers
|
|
* being placed at the head of the list.
|
|
* See nfs_inode_attach_open_context()
|
|
*/
|
|
return (list_first_entry(&nfsi->open_files,
|
|
struct nfs_open_context,
|
|
list)->mode & FMODE_WRITE) == FMODE_WRITE;
|
|
}
|
|
|
|
static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
|
|
{
|
|
return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
|
|
}
|
|
|
|
static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
unsigned long ret = 0;
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
|
|
&& (fattr->valid & NFS_ATTR_FATTR_CHANGE)
|
|
&& inode->i_version == fattr->pre_change_attr) {
|
|
inode->i_version = fattr->change_attr;
|
|
if (S_ISDIR(inode->i_mode))
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
|
|
ret |= NFS_INO_INVALID_ATTR;
|
|
}
|
|
/* If we have atomic WCC data, we may update some attributes */
|
|
if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
|
|
&& (fattr->valid & NFS_ATTR_FATTR_CTIME)
|
|
&& timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
|
|
memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
|
|
ret |= NFS_INO_INVALID_ATTR;
|
|
}
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
|
|
&& (fattr->valid & NFS_ATTR_FATTR_MTIME)
|
|
&& timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
|
|
memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
|
|
if (S_ISDIR(inode->i_mode))
|
|
nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
|
|
ret |= NFS_INO_INVALID_ATTR;
|
|
}
|
|
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)
|
|
&& nfsi->nrequests == 0) {
|
|
i_size_write(inode, nfs_size_to_loff_t(fattr->size));
|
|
ret |= NFS_INO_INVALID_ATTR;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* nfs_check_inode_attributes - verify consistency of the inode attribute cache
|
|
* @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.
|
|
*/
|
|
static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
loff_t cur_size, new_isize;
|
|
unsigned long invalid = 0;
|
|
|
|
|
|
if (nfs_have_delegated_attributes(inode))
|
|
return 0;
|
|
/* Has the inode gone and changed behind our back? */
|
|
if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
|
|
return -ESTALE;
|
|
if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
|
|
return -ESTALE;
|
|
|
|
if (!nfs_file_has_buffered_writers(nfsi)) {
|
|
/* Verify a few of the more important attributes */
|
|
if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && inode->i_version != fattr->change_attr)
|
|
invalid |= NFS_INO_INVALID_ATTR | NFS_INO_REVAL_PAGECACHE;
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
|
|
invalid |= NFS_INO_INVALID_ATTR;
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime))
|
|
invalid |= NFS_INO_INVALID_ATTR;
|
|
|
|
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)
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
|
|
}
|
|
}
|
|
|
|
/* Have any file permissions changed? */
|
|
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;
|
|
if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
|
|
invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
|
|
if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
|
|
invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
|
|
|
|
/* Has the link count changed? */
|
|
if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
|
|
invalid |= NFS_INO_INVALID_ATTR;
|
|
|
|
if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
|
|
invalid |= NFS_INO_INVALID_ATIME;
|
|
|
|
if (invalid != 0)
|
|
nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED);
|
|
|
|
nfsi->read_cache_jiffies = fattr->time_start;
|
|
return 0;
|
|
}
|
|
|
|
static atomic_long_t nfs_attr_generation_counter;
|
|
|
|
static unsigned long nfs_read_attr_generation_counter(void)
|
|
{
|
|
return atomic_long_read(&nfs_attr_generation_counter);
|
|
}
|
|
|
|
unsigned long nfs_inc_attr_generation_counter(void)
|
|
{
|
|
return atomic_long_inc_return(&nfs_attr_generation_counter);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
|
|
|
|
void nfs_fattr_init(struct nfs_fattr *fattr)
|
|
{
|
|
fattr->valid = 0;
|
|
fattr->time_start = jiffies;
|
|
fattr->gencount = nfs_inc_attr_generation_counter();
|
|
fattr->owner_name = NULL;
|
|
fattr->group_name = NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_fattr_init);
|
|
|
|
/**
|
|
* nfs_fattr_set_barrier
|
|
* @fattr: attributes
|
|
*
|
|
* Used to set a barrier after an attribute was updated. This
|
|
* barrier ensures that older attributes from RPC calls that may
|
|
* have raced with our update cannot clobber these new values.
|
|
* Note that you are still responsible for ensuring that other
|
|
* operations which change the attribute on the server do not
|
|
* collide.
|
|
*/
|
|
void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
|
|
{
|
|
fattr->gencount = nfs_inc_attr_generation_counter();
|
|
}
|
|
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
|
|
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
|
|
|
|
#ifdef NFS_DEBUG
|
|
/*
|
|
* _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 */
|
|
return nfs_fhandle_hash(fh);
|
|
}
|
|
EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
|
|
|
|
/*
|
|
* _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;
|
|
|
|
if (fh == NULL || fh->size == 0) {
|
|
printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
|
|
return;
|
|
}
|
|
|
|
printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
|
|
caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
|
|
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));
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
|
|
#endif
|
|
|
|
/**
|
|
* 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.
|
|
* Note also the check for wraparound of 'attr_gencount'
|
|
*
|
|
* 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);
|
|
|
|
return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
|
|
((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
|
|
}
|
|
|
|
static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
int ret;
|
|
|
|
trace_nfs_refresh_inode_enter(inode);
|
|
|
|
if (nfs_inode_attrs_need_update(inode, fattr))
|
|
ret = nfs_update_inode(inode, fattr);
|
|
else
|
|
ret = nfs_check_inode_attributes(inode, fattr);
|
|
|
|
trace_nfs_refresh_inode_exit(inode, ret);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
status = nfs_refresh_inode_locked(inode, fattr);
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_refresh_inode);
|
|
|
|
static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
unsigned long invalid = NFS_INO_INVALID_ATTR;
|
|
|
|
if (S_ISDIR(inode->i_mode))
|
|
invalid |= NFS_INO_INVALID_DATA;
|
|
nfs_set_cache_invalid(inode, invalid);
|
|
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
|
|
return 0;
|
|
return nfs_refresh_inode_locked(inode, fattr);
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* 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().
|
|
*/
|
|
int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
int status;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
nfs_fattr_set_barrier(fattr);
|
|
status = nfs_post_op_update_inode_locked(inode, fattr);
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
|
|
|
|
/**
|
|
* nfs_post_op_update_inode_force_wcc_locked - 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_locked(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
int status;
|
|
|
|
/* 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)) {
|
|
fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
|
|
| NFS_ATTR_FATTR_PRESIZE
|
|
| NFS_ATTR_FATTR_PREMTIME
|
|
| NFS_ATTR_FATTR_PRECTIME);
|
|
goto out_noforce;
|
|
}
|
|
if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
|
|
(fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
|
|
fattr->pre_change_attr = inode->i_version;
|
|
fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
|
|
}
|
|
if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
|
|
(fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
|
|
memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
|
|
fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
|
|
}
|
|
if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
|
|
(fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
|
|
memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
|
|
fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
|
|
}
|
|
if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
|
|
(fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
|
|
fattr->pre_size = i_size_read(inode);
|
|
fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
|
|
}
|
|
out_noforce:
|
|
status = nfs_post_op_update_inode_locked(inode, fattr);
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int status;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
nfs_fattr_set_barrier(fattr);
|
|
status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
|
|
spin_unlock(&inode->i_lock);
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
|
|
|
|
|
|
static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
|
|
struct nfs_fattr *fattr)
|
|
{
|
|
bool ret1 = true, ret2 = true;
|
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_FILEID)
|
|
ret1 = (nfsi->fileid == fattr->fileid);
|
|
if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
|
|
ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
|
|
return ret1 || ret2;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
|
|
{
|
|
struct nfs_server *server;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
loff_t cur_isize, new_isize;
|
|
unsigned long invalid = 0;
|
|
unsigned long now = jiffies;
|
|
unsigned long save_cache_validity;
|
|
bool have_writers = nfs_file_has_buffered_writers(nfsi);
|
|
bool cache_revalidated = true;
|
|
|
|
dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
|
|
__func__, inode->i_sb->s_id, inode->i_ino,
|
|
nfs_display_fhandle_hash(NFS_FH(inode)),
|
|
atomic_read(&inode->i_count), fattr->valid);
|
|
|
|
if (!nfs_fileid_valid(nfsi, fattr)) {
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Make sure the inode's type hasn't changed.
|
|
*/
|
|
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 %lu mode changed, %07o to %07o\n",
|
|
__func__, inode->i_ino, inode->i_mode, fattr->mode);
|
|
goto out_err;
|
|
}
|
|
|
|
server = NFS_SERVER(inode);
|
|
/* Update the fsid? */
|
|
if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
|
|
!nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
|
|
!IS_AUTOMOUNT(inode))
|
|
server->fsid = fattr->fsid;
|
|
|
|
/*
|
|
* Update the read time so we don't revalidate too often.
|
|
*/
|
|
nfsi->read_cache_jiffies = fattr->time_start;
|
|
|
|
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);
|
|
|
|
/* Do atomic weak cache consistency updates */
|
|
invalid |= nfs_wcc_update_inode(inode, fattr);
|
|
|
|
if (pnfs_layoutcommit_outstanding(inode)) {
|
|
nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
|
|
cache_revalidated = false;
|
|
}
|
|
|
|
/* More cache consistency checks */
|
|
if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
|
|
if (inode->i_version != fattr->change_attr) {
|
|
dprintk("NFS: change_attr change on server for file %s/%ld\n",
|
|
inode->i_sb->s_id, inode->i_ino);
|
|
/* Could it be a race with writeback? */
|
|
if (!have_writers) {
|
|
invalid |= NFS_INO_INVALID_ATTR
|
|
| NFS_INO_INVALID_DATA
|
|
| NFS_INO_INVALID_ACCESS
|
|
| NFS_INO_INVALID_ACL;
|
|
if (S_ISDIR(inode->i_mode))
|
|
nfs_force_lookup_revalidate(inode);
|
|
}
|
|
inode->i_version = fattr->change_attr;
|
|
}
|
|
} else {
|
|
nfsi->cache_validity |= save_cache_validity;
|
|
cache_revalidated = false;
|
|
}
|
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
|
|
memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
|
|
} else if (server->caps & NFS_CAP_MTIME) {
|
|
nfsi->cache_validity |= save_cache_validity &
|
|
(NFS_INO_INVALID_ATTR
|
|
| NFS_INO_REVAL_FORCED);
|
|
cache_revalidated = false;
|
|
}
|
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
|
|
memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
|
|
} else if (server->caps & NFS_CAP_CTIME) {
|
|
nfsi->cache_validity |= save_cache_validity &
|
|
(NFS_INO_INVALID_ATTR
|
|
| NFS_INO_REVAL_FORCED);
|
|
cache_revalidated = false;
|
|
}
|
|
|
|
/* Check if our cached file size is stale */
|
|
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? */
|
|
if (nfsi->nrequests == 0 || new_isize > cur_isize) {
|
|
i_size_write(inode, new_isize);
|
|
if (!have_writers)
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
|
|
}
|
|
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);
|
|
}
|
|
} else {
|
|
nfsi->cache_validity |= save_cache_validity &
|
|
(NFS_INO_INVALID_ATTR
|
|
| NFS_INO_REVAL_PAGECACHE
|
|
| NFS_INO_REVAL_FORCED);
|
|
cache_revalidated = false;
|
|
}
|
|
|
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_ATIME)
|
|
memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
|
|
else if (server->caps & NFS_CAP_ATIME) {
|
|
nfsi->cache_validity |= save_cache_validity &
|
|
(NFS_INO_INVALID_ATIME
|
|
| NFS_INO_REVAL_FORCED);
|
|
cache_revalidated = false;
|
|
}
|
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_MODE) {
|
|
if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
|
|
umode_t newmode = inode->i_mode & S_IFMT;
|
|
newmode |= fattr->mode & S_IALLUGO;
|
|
inode->i_mode = newmode;
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
|
|
}
|
|
} else if (server->caps & NFS_CAP_MODE) {
|
|
nfsi->cache_validity |= save_cache_validity &
|
|
(NFS_INO_INVALID_ATTR
|
|
| NFS_INO_INVALID_ACCESS
|
|
| NFS_INO_INVALID_ACL
|
|
| NFS_INO_REVAL_FORCED);
|
|
cache_revalidated = false;
|
|
}
|
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
|
|
if (!uid_eq(inode->i_uid, fattr->uid)) {
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
|
|
inode->i_uid = fattr->uid;
|
|
}
|
|
} else if (server->caps & NFS_CAP_OWNER) {
|
|
nfsi->cache_validity |= save_cache_validity &
|
|
(NFS_INO_INVALID_ATTR
|
|
| NFS_INO_INVALID_ACCESS
|
|
| NFS_INO_INVALID_ACL
|
|
| NFS_INO_REVAL_FORCED);
|
|
cache_revalidated = false;
|
|
}
|
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
|
|
if (!gid_eq(inode->i_gid, fattr->gid)) {
|
|
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
|
|
inode->i_gid = fattr->gid;
|
|
}
|
|
} else if (server->caps & NFS_CAP_OWNER_GROUP) {
|
|
nfsi->cache_validity |= save_cache_validity &
|
|
(NFS_INO_INVALID_ATTR
|
|
| NFS_INO_INVALID_ACCESS
|
|
| NFS_INO_INVALID_ACL
|
|
| NFS_INO_REVAL_FORCED);
|
|
cache_revalidated = false;
|
|
}
|
|
|
|
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;
|
|
set_nlink(inode, fattr->nlink);
|
|
}
|
|
} else if (server->caps & NFS_CAP_NLINK) {
|
|
nfsi->cache_validity |= save_cache_validity &
|
|
(NFS_INO_INVALID_ATTR
|
|
| NFS_INO_REVAL_FORCED);
|
|
cache_revalidated = false;
|
|
}
|
|
|
|
if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
|
|
/*
|
|
* report the blocks in 512byte units
|
|
*/
|
|
inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
|
|
} else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
|
|
inode->i_blocks = fattr->du.nfs2.blocks;
|
|
else
|
|
cache_revalidated = false;
|
|
|
|
/* Update attrtimeo value if we're out of the unstable period */
|
|
if (invalid & NFS_INO_INVALID_ATTR) {
|
|
nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
|
|
nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
|
|
nfsi->attrtimeo_timestamp = now;
|
|
/* Set barrier to be more recent than all outstanding updates */
|
|
nfsi->attr_gencount = nfs_inc_attr_generation_counter();
|
|
} else {
|
|
if (cache_revalidated) {
|
|
if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
|
|
nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
|
|
nfsi->attrtimeo <<= 1;
|
|
if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
|
|
nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
|
|
}
|
|
nfsi->attrtimeo_timestamp = now;
|
|
}
|
|
/* Set the barrier to be more recent than this fattr */
|
|
if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
|
|
nfsi->attr_gencount = fattr->gencount;
|
|
}
|
|
|
|
/* Don't declare attrcache up to date if there were no attrs! */
|
|
if (cache_revalidated)
|
|
invalid &= ~NFS_INO_INVALID_ATTR;
|
|
|
|
/* 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;
|
|
if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
|
|
(save_cache_validity & NFS_INO_REVAL_FORCED))
|
|
nfs_set_cache_invalid(inode, invalid);
|
|
|
|
return 0;
|
|
out_err:
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
struct inode *nfs_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct nfs_inode *nfsi;
|
|
nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
|
|
if (!nfsi)
|
|
return NULL;
|
|
nfsi->flags = 0UL;
|
|
nfsi->cache_validity = 0UL;
|
|
#if IS_ENABLED(CONFIG_NFS_V4)
|
|
nfsi->nfs4_acl = NULL;
|
|
#endif /* CONFIG_NFS_V4 */
|
|
return &nfsi->vfs_inode;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_alloc_inode);
|
|
|
|
static void nfs_i_callback(struct rcu_head *head)
|
|
{
|
|
struct inode *inode = container_of(head, struct inode, i_rcu);
|
|
kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
|
|
}
|
|
|
|
void nfs_destroy_inode(struct inode *inode)
|
|
{
|
|
call_rcu(&inode->i_rcu, nfs_i_callback);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_destroy_inode);
|
|
|
|
static inline void nfs4_init_once(struct nfs_inode *nfsi)
|
|
{
|
|
#if IS_ENABLED(CONFIG_NFS_V4)
|
|
INIT_LIST_HEAD(&nfsi->open_states);
|
|
nfsi->delegation = NULL;
|
|
init_rwsem(&nfsi->rwsem);
|
|
nfsi->layout = NULL;
|
|
#endif
|
|
}
|
|
|
|
static void init_once(void *foo)
|
|
{
|
|
struct nfs_inode *nfsi = (struct nfs_inode *) foo;
|
|
|
|
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);
|
|
INIT_LIST_HEAD(&nfsi->commit_info.list);
|
|
nfsi->nrequests = 0;
|
|
nfsi->commit_info.ncommit = 0;
|
|
atomic_set(&nfsi->commit_info.rpcs_out, 0);
|
|
init_rwsem(&nfsi->rmdir_sem);
|
|
nfs4_init_once(nfsi);
|
|
}
|
|
|
|
static int __init nfs_init_inodecache(void)
|
|
{
|
|
nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
|
|
sizeof(struct nfs_inode),
|
|
0, (SLAB_RECLAIM_ACCOUNT|
|
|
SLAB_MEM_SPREAD|SLAB_ACCOUNT),
|
|
init_once);
|
|
if (nfs_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nfs_destroy_inodecache(void)
|
|
{
|
|
/*
|
|
* Make sure all delayed rcu free inodes are flushed before we
|
|
* destroy cache.
|
|
*/
|
|
rcu_barrier();
|
|
kmem_cache_destroy(nfs_inode_cachep);
|
|
}
|
|
|
|
struct workqueue_struct *nfsiod_workqueue;
|
|
EXPORT_SYMBOL_GPL(nfsiod_workqueue);
|
|
|
|
/*
|
|
* start up the nfsiod workqueue
|
|
*/
|
|
static int nfsiod_start(void)
|
|
{
|
|
struct workqueue_struct *wq;
|
|
dprintk("RPC: creating workqueue nfsiod\n");
|
|
wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
|
|
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);
|
|
}
|
|
|
|
unsigned int nfs_net_id;
|
|
EXPORT_SYMBOL_GPL(nfs_net_id);
|
|
|
|
static int nfs_net_init(struct net *net)
|
|
{
|
|
nfs_clients_init(net);
|
|
return nfs_fs_proc_net_init(net);
|
|
}
|
|
|
|
static void nfs_net_exit(struct net *net)
|
|
{
|
|
nfs_fs_proc_net_exit(net);
|
|
nfs_cleanup_cb_ident_idr(net);
|
|
}
|
|
|
|
static struct pernet_operations nfs_net_ops = {
|
|
.init = nfs_net_init,
|
|
.exit = nfs_net_exit,
|
|
.id = &nfs_net_id,
|
|
.size = sizeof(struct nfs_net),
|
|
};
|
|
|
|
/*
|
|
* Initialize NFS
|
|
*/
|
|
static int __init init_nfs_fs(void)
|
|
{
|
|
int err;
|
|
|
|
err = register_pernet_subsys(&nfs_net_ops);
|
|
if (err < 0)
|
|
goto out9;
|
|
|
|
err = nfs_fscache_register();
|
|
if (err < 0)
|
|
goto out8;
|
|
|
|
err = nfsiod_start();
|
|
if (err)
|
|
goto out7;
|
|
|
|
err = nfs_fs_proc_init();
|
|
if (err)
|
|
goto out6;
|
|
|
|
err = nfs_init_nfspagecache();
|
|
if (err)
|
|
goto out5;
|
|
|
|
err = nfs_init_inodecache();
|
|
if (err)
|
|
goto out4;
|
|
|
|
err = nfs_init_readpagecache();
|
|
if (err)
|
|
goto out3;
|
|
|
|
err = nfs_init_writepagecache();
|
|
if (err)
|
|
goto out2;
|
|
|
|
err = nfs_init_directcache();
|
|
if (err)
|
|
goto out1;
|
|
|
|
rpc_proc_register(&init_net, &nfs_rpcstat);
|
|
|
|
err = register_nfs_fs();
|
|
if (err)
|
|
goto out0;
|
|
|
|
return 0;
|
|
out0:
|
|
rpc_proc_unregister(&init_net, "nfs");
|
|
nfs_destroy_directcache();
|
|
out1:
|
|
nfs_destroy_writepagecache();
|
|
out2:
|
|
nfs_destroy_readpagecache();
|
|
out3:
|
|
nfs_destroy_inodecache();
|
|
out4:
|
|
nfs_destroy_nfspagecache();
|
|
out5:
|
|
nfs_fs_proc_exit();
|
|
out6:
|
|
nfsiod_stop();
|
|
out7:
|
|
nfs_fscache_unregister();
|
|
out8:
|
|
unregister_pernet_subsys(&nfs_net_ops);
|
|
out9:
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_nfs_fs(void)
|
|
{
|
|
nfs_destroy_directcache();
|
|
nfs_destroy_writepagecache();
|
|
nfs_destroy_readpagecache();
|
|
nfs_destroy_inodecache();
|
|
nfs_destroy_nfspagecache();
|
|
nfs_fscache_unregister();
|
|
unregister_pernet_subsys(&nfs_net_ops);
|
|
rpc_proc_unregister(&init_net, "nfs");
|
|
unregister_nfs_fs();
|
|
nfs_fs_proc_exit();
|
|
nfsiod_stop();
|
|
}
|
|
|
|
/* Not quite true; I just maintain it */
|
|
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
|
|
MODULE_LICENSE("GPL");
|
|
module_param(enable_ino64, bool, 0644);
|
|
|
|
module_init(init_nfs_fs)
|
|
module_exit(exit_nfs_fs)
|