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| author | Eric Van Hensbergen <ericvh@gmail.com> | 2007-01-26 00:57:06 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-01-26 13:51:00 -0800 |
| commit | da977b2c7eb4d6312f063a7b486f2aad99809710 (patch) | |
| tree | bb8a2afc766c16e3349e03dfb8a706dca6408395 /fs/9p/fid.h | |
| parent | ff76e1dfc8728278ee231feeb93146f9c57c3ec3 (diff) | |
| download | linux-da977b2c7eb4d6312f063a7b486f2aad99809710.tar.gz linux-da977b2c7eb4d6312f063a7b486f2aad99809710.tar.bz2 linux-da977b2c7eb4d6312f063a7b486f2aad99809710.zip | |
[PATCH] 9p: fix segfault caused by race condition in meta-data operations
Running dbench multithreaded exposed a race condition where fid structures
were removed while in use. This patch adds semaphores to meta-data operations
to protect the fid structure. Some cleanup of error-case handling in the
inode operations is also included.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/9p/fid.h')
| -rw-r--r-- | fs/9p/fid.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/9p/fid.h b/fs/9p/fid.h index aa974d6875c3..48fc170c26c8 100644 --- a/fs/9p/fid.h +++ b/fs/9p/fid.h @@ -30,6 +30,8 @@ struct v9fs_fid { struct list_head list; /* list of fids associated with a dentry */ struct list_head active; /* XXX - debug */ + struct semaphore lock; + u32 fid; unsigned char fidopen; /* set when fid is opened */ unsigned char fidclunked; /* set when fid has already been clunked */ @@ -55,3 +57,6 @@ struct v9fs_fid *v9fs_fid_get_created(struct dentry *); void v9fs_fid_destroy(struct v9fs_fid *fid); struct v9fs_fid *v9fs_fid_create(struct v9fs_session_info *, int fid); int v9fs_fid_insert(struct v9fs_fid *fid, struct dentry *dentry); +struct v9fs_fid *v9fs_fid_clone(struct dentry *dentry); +void v9fs_fid_clunk(struct v9fs_session_info *v9ses, struct v9fs_fid *fid); + |