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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2006-10-21 10:24:20 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-21 13:35:06 -0700 |
| commit | 9eaef27b36a6b716384948da94b8fc5bfba7b712 (patch) | |
| tree | ab69cf9c3863bb7ca564574c914e5b6bf8ad3162 /fs/nfs/dir.c | |
| parent | 3f7705eab6722ad1a346d748c4aad55755d6c241 (diff) | |
| download | op-kernel-dev-9eaef27b36a6b716384948da94b8fc5bfba7b712.zip op-kernel-dev-9eaef27b36a6b716384948da94b8fc5bfba7b712.tar.gz | |
[PATCH] VFS: Make d_materialise_unique() enforce directory uniqueness
If the caller tries to instantiate a directory using an inode that already
has a dentry alias, then we attempt to rename the existing dentry instead
of instantiating a new one. Fail with an ELOOP error if the rename would
affect one of our parent directories.
This behaviour is needed in order to avoid issues such as
http://bugzilla.kernel.org/show_bug.cgi?id=7178
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Maneesh Soni <maneesh@in.ibm.com>
Cc: Dipankar Sarma <dipankar@in.ibm.com>
Cc: Neil Brown <neilb@cse.unsw.edu.au>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/nfs/dir.c')
| -rw-r--r-- | fs/nfs/dir.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index 4133ef5..27b5a10 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -935,8 +935,11 @@ static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, stru no_entry: res = d_materialise_unique(dentry, inode); - if (res != NULL) + if (res != NULL) { + if (IS_ERR(res)) + goto out_unlock; dentry = res; + } nfs_renew_times(dentry); nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); out_unlock: @@ -1132,6 +1135,8 @@ static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc) alias = d_materialise_unique(dentry, inode); if (alias != NULL) { dput(dentry); + if (IS_ERR(alias)) + return NULL; dentry = alias; } |
