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| author | Trond Myklebust | 2005-11-04 21:33:38 +0100 |
|---|---|---|
| committer | Trond Myklebust | 2005-11-04 21:33:38 +0100 |
| commit | d530838bfa507d67b40d13b00d9cbd7a46a47e78 (patch) | |
| tree | f4b2be26c0a7b9ed3233a2be016b7e97427f8705 /fs/nfs/inode.c | |
| parent | NFSv4: Fix a race between open() and close() (diff) | |
| download | kernel-qcow2-linux-d530838bfa507d67b40d13b00d9cbd7a46a47e78.tar.gz kernel-qcow2-linux-d530838bfa507d67b40d13b00d9cbd7a46a47e78.tar.xz kernel-qcow2-linux-d530838bfa507d67b40d13b00d9cbd7a46a47e78.zip | |
NFSv4: Fix problem with OPEN_DOWNGRADE
RFC 3530 states that for OPEN_DOWNGRADE "The share_access and share_deny
bits specified must be exactly equal to the union of the share_access and
share_deny bits specified for some subset of the OPENs in effect for
current openowner on the current file.
Setattr is currently violating the NFSv4 rules for OPEN_DOWNGRADE in that
it may cause a downgrade from OPEN4_SHARE_ACCESS_BOTH to
OPEN4_SHARE_ACCESS_WRITE despite the fact that there exists no open file
with O_WRONLY access mode.
Fix the problem by replacing nfs4_find_state() with a modified version of
nfs_find_open_context().
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/inode.c')
| -rw-r--r-- | fs/nfs/inode.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index fc0f12ba89cc..24d2fbf549bd 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -1009,13 +1009,18 @@ void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) spin_unlock(&inode->i_lock); } -struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode) +/* + * 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, int 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 & mode) == mode) { ctx = get_nfs_open_context(pos); break; |