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NFS: Make stat() return updated mtimes after a write() 

The SuS states that a call to write() will cause mtime to be updated on
 the file. In order to satisfy that requirement, we need to flush out
 any cached writes in nfs_getattr().
 Speed things up slightly by not committing the writes.

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2006-01-03 09:55:34 +01:00
parent 24174119c7
commit 70b9ecbdb9
3 changed files with 15 additions and 11 deletions
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2
fs/nfs/inode.c
View File

@ -952,6 +952,8 @@ int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
int err;
/* Flush out writes to the server in order to update c/mtime */
nfs_sync_inode(inode, 0, 0, FLUSH_WAIT|FLUSH_NOCOMMIT);
if (__IS_FLG(inode, MS_NOATIME))
need_atime = 0;
else if (__IS_FLG(inode, MS_NODIRATIME) && S_ISDIR(inode->i_mode))

23
fs/nfs/write.c
View File

@ -1377,22 +1377,23 @@ int nfs_commit_inode(struct inode *inode, int how)
int nfs_sync_inode(struct inode *inode, unsigned long idx_start,
unsigned int npages, int how)
{
int error,
wait;
int nocommit = how & FLUSH_NOCOMMIT;
int wait = how & FLUSH_WAIT;
int error;
wait = how & FLUSH_WAIT;
how &= ~FLUSH_WAIT;
how &= ~(FLUSH_WAIT|FLUSH_NOCOMMIT);
do {
error = 0;
if (wait)
if (wait) {
error = nfs_wait_on_requests(inode, idx_start, npages);
if (error == 0)
error = nfs_flush_inode(inode, idx_start, npages, how);
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
if (error == 0)
if (error != 0)
continue;
}
error = nfs_flush_inode(inode, idx_start, npages, how);
if (error != 0)
continue;
if (!nocommit)
error = nfs_commit_inode(inode, how);
#endif
} while (error > 0);
return error;
}

1
include/linux/nfs_fs.h
View File

@ -62,6 +62,7 @@
#define FLUSH_STABLE 4 /* commit to stable storage */
#define FLUSH_LOWPRI 8 /* low priority background flush */
#define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
#define FLUSH_NOCOMMIT 32 /* Don't send the NFSv3/v4 COMMIT */
#ifdef __KERNEL__