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| author |   Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2010-06-30 19:18:50 +0530 |
|---|---|---|
| committer |   Eric Van Hensbergen <ericvh@gmail.com> | 2010-08-02 14:28:35 -0500 |
| commit | a534c8d15b1f1d0f861fc2bb9e0529bd8486ec3f (patch) | |
| tree | 0451da7a61bd7e3eb5968d65beee3243f7f51b5d /fs/9p/v9fs.h | |
| parent | fs/9p: Add support user. xattr (diff) | |
| download | linux-dev-a534c8d15b1f1d0f861fc2bb9e0529bd8486ec3f.tar.xz linux-dev-a534c8d15b1f1d0f861fc2bb9e0529bd8486ec3f.zip | |
fs/9p: Prevent parallel rename when doing fid_lookup
During fid lookup we need to make sure that the dentry->d_parent doesn't
change so that we can safely walk the parent dentries. To ensure that
we need to prevent cross directory rename during fid_lookup. Add a
per superblock rename_sem rw_semaphore to prevent parallel fid lookup and
rename.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'fs/9p/v9fs.h')
| -rw-r--r-- | fs/9p/v9fs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h index bec4d0bcb458..4c963c9fc41f 100644 --- a/fs/9p/v9fs.h +++ b/fs/9p/v9fs.h @@ -104,6 +104,7 @@ struct v9fs_session_info { struct p9_client *clnt; /* 9p client */ struct list_head slist; /* list of sessions registered with v9fs */ struct backing_dev_info bdi; + struct rw_semaphore rename_sem; }; struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *, |