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| author | Jeff Mahoney <jeffm@suse.com> | 2014-05-21 13:28:07 -0400 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2014-05-21 22:36:56 +0200 |
| commit | 22e7478ddbcb670e33fab72d0bbe7c394c3a2c84 (patch) | |
| tree | 89c8bdbe58995dc2c0ae3d7a11b9050db2c2de54 /fs/reiserfs | |
| parent | 770901cc1352b46f0e2de08260ec40c0364d7723 (diff) | |
| download | lwn-22e7478ddbcb670e33fab72d0bbe7c394c3a2c84.tar.gz lwn-22e7478ddbcb670e33fab72d0bbe7c394c3a2c84.zip | |
reiserfs: call truncate_setsize under tailpack mutex
Prior to commit 0e4f6a791b1e (Fix reiserfs_file_release()), reiserfs
truncates serialized on i_mutex. They mostly still do, with the exception
of reiserfs_file_release. That blocks out other writers via the tailpack
mutex and the inode openers counter adjusted in reiserfs_file_open.
However, NFS will call reiserfs_setattr without having called ->open, so
we end up with a race when nfs is calling ->setattr while another
process is releasing the file. Ultimately, it triggers the
BUG_ON(inode->i_size != new_file_size) check in maybe_indirect_to_direct.
The solution is to pull the lock into reiserfs_setattr to encompass the
truncate_setsize call as well.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/reiserfs')
| -rw-r--r-- | fs/reiserfs/inode.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c index 874c8b329cfe..e3ca04894919 100644 --- a/fs/reiserfs/inode.c +++ b/fs/reiserfs/inode.c @@ -3422,8 +3422,14 @@ int reiserfs_setattr(struct dentry *dentry, struct iattr *attr) attr->ia_size != i_size_read(inode)) { error = inode_newsize_ok(inode, attr->ia_size); if (!error) { + /* + * Could race against reiserfs_file_release + * if called from NFS, so take tailpack mutex. + */ + mutex_lock(&REISERFS_I(inode)->tailpack); truncate_setsize(inode, attr->ia_size); - reiserfs_vfs_truncate_file(inode); + reiserfs_truncate_file(inode, 1); + mutex_unlock(&REISERFS_I(inode)->tailpack); } } |