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[PATCH] NFS: Fix the file size revalidation

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Instead of looking at whether or not the file is open for writes before
 we accept to update the length using the server value, we should rather
 be looking at whether or not we are currently caching any writes.

 Failure to do so means in particular that we're not updating the file
 length correctly after obtaining a POSIX or BSD lock.

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2005-06-22 17:16:30 +00:00
parent 08e9eac42e
commit 951a143b3f
4 changed files with 21 additions and 55 deletions
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2
fs/nfs/direct.c
View File

@ -517,7 +517,7 @@ retry:
result = tot_bytes;
out:
nfs_end_data_update_defer(inode);
nfs_end_data_update(inode);
nfs_writedata_free(wdata);
return result;

69
fs/nfs/inode.c
View File

@ -1147,27 +1147,6 @@ void nfs_end_data_update(struct inode *inode)
atomic_dec(&nfsi->data_updates);
}
/**
* nfs_end_data_update_defer
* @inode - pointer to inode
* Declare end of the operations that will update file data
* This will defer marking the inode as needing revalidation
* unless there are no other pending updates.
*/
void nfs_end_data_update_defer(struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
if (atomic_dec_and_test(&nfsi->data_updates)) {
/* Mark the attribute cache for revalidation */
nfsi->flags |= NFS_INO_INVALID_ATTR;
/* Directories and symlinks: invalidate page cache too */
if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
nfsi->flags |= NFS_INO_INVALID_DATA;
nfsi->cache_change_attribute ++;
}
}
/**
* nfs_refresh_inode - verify consistency of the inode attribute cache
* @inode - pointer to inode
@ -1222,8 +1201,8 @@ int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
if (!timespec_equal(&inode->i_mtime, &fattr->mtime)
|| cur_size != new_isize)
nfsi->flags |= NFS_INO_INVALID_ATTR;
} else if (S_ISREG(inode->i_mode) && new_isize > cur_size)
nfsi->flags |= NFS_INO_INVALID_ATTR;
} else if (new_isize != cur_size && nfsi->npages == 0)
nfsi->flags |= NFS_INO_INVALID_ATTR;
/* Have any file permissions changed? */
if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
@ -1257,10 +1236,8 @@ int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsigned long verifier)
{
struct nfs_inode *nfsi = NFS_I(inode);
__u64 new_size;
loff_t new_isize;
loff_t cur_isize, new_isize;
unsigned int invalid = 0;
loff_t cur_isize;
int data_unstable;
dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
@ -1293,49 +1270,39 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsign
/* Are we racing with known updates of the metadata on the server? */
data_unstable = ! nfs_verify_change_attribute(inode, verifier);
/* Check if the file size agrees */
new_size = fattr->size;
/* Check if our cached file size is stale */
new_isize = nfs_size_to_loff_t(fattr->size);
cur_isize = i_size_read(inode);
if (cur_isize != new_size) {
#ifdef NFS_DEBUG_VERBOSE
printk(KERN_DEBUG "NFS: isize change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino);
#endif
/*
* If we have pending writebacks, things can get
* messy.
*/
if (S_ISREG(inode->i_mode) && data_unstable) {
if (new_isize > cur_isize) {
if (new_isize != cur_isize) {
/* Do we perhaps have any outstanding writes? */
if (nfsi->npages == 0) {
/* No, but did we race with nfs_end_data_update()? */
if (verifier == nfsi->cache_change_attribute) {
inode->i_size = new_isize;
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
invalid |= NFS_INO_INVALID_DATA;
}
} else {
invalid |= NFS_INO_INVALID_ATTR;
} else if (new_isize > cur_isize) {
inode->i_size = new_isize;
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
}
dprintk("NFS: isize change on server for file %s/%ld\n",
inode->i_sb->s_id, inode->i_ino);
}
/*
* Note: we don't check inode->i_mtime since pipes etc.
* can change this value in VFS without requiring a
* cache revalidation.
*/
/* Check if the mtime agrees */
if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
#ifdef NFS_DEBUG_VERBOSE
printk(KERN_DEBUG "NFS: mtime change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino);
#endif
dprintk("NFS: mtime change on server for file %s/%ld\n",
inode->i_sb->s_id, inode->i_ino);
if (!data_unstable)
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
}
if ((fattr->valid & NFS_ATTR_FATTR_V4)
&& nfsi->change_attr != fattr->change_attr) {
#ifdef NFS_DEBUG_VERBOSE
printk(KERN_DEBUG "NFS: change_attr change on %s/%ld\n",
dprintk("NFS: change_attr change on server for file %s/%ld\n",
inode->i_sb->s_id, inode->i_ino);
#endif
nfsi->change_attr = fattr->change_attr;
if (!data_unstable)
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;

4
fs/nfs/write.c
View File

@ -220,7 +220,7 @@ static int nfs_writepage_sync(struct nfs_open_context *ctx, struct inode *inode,
ClearPageError(page);
io_error:
nfs_end_data_update_defer(inode);
nfs_end_data_update(inode);
nfs_writedata_free(wdata);
return written ? written : result;
}
@ -401,7 +401,7 @@ static void nfs_inode_remove_request(struct nfs_page *req)
nfsi->npages--;
if (!nfsi->npages) {
spin_unlock(&nfsi->req_lock);
nfs_end_data_update_defer(inode);
nfs_end_data_update(inode);
iput(inode);
} else
spin_unlock(&nfsi->req_lock);

1
include/linux/nfs_fs.h
View File

@ -294,7 +294,6 @@ extern void nfs_begin_attr_update(struct inode *);
extern void nfs_end_attr_update(struct inode *);
extern void nfs_begin_data_update(struct inode *);
extern void nfs_end_data_update(struct inode *);
extern void nfs_end_data_update_defer(struct inode *);
extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred);
extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
extern void put_nfs_open_context(struct nfs_open_context *ctx);