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ceph: replace hold_mutex flag with goto 

All of the early exit paths need to drop the mutex; it is only the normal
path through the function that does not.  Skip the unlock in that case
with a goto out_unlocked.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Jianpeng Ma <majianpeng@gmail.com>
This commit is contained in:
Sage Weil 2013-08-09 09:57:58 -07:00
parent 0e5dd45ce4
commit 2f75e9e179
1 changed files with 5 additions and 8 deletions
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13
fs/ceph/file.c
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@ -710,13 +710,11 @@ static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
&ceph_sb_to_client(inode->i_sb)->client->osdc;
ssize_t count, written = 0;
int err, want, got;
bool hold_mutex;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
mutex_lock(&inode->i_mutex);
hold_mutex = true;
err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
if (err)
@ -772,7 +770,6 @@ retry_snap:
inode, ceph_vinop(inode),
pos, (unsigned)iov->iov_len);
mutex_lock(&inode->i_mutex);
hold_mutex = true;
goto retry_snap;
}
} else {
@ -781,7 +778,6 @@ retry_snap:
count, 0);
mutex_unlock(&inode->i_mutex);
}
hold_mutex = false;
if (written >= 0) {
int dirty;
@ -805,11 +801,12 @@ retry_snap:
written = err;
}
out:
if (hold_mutex)
mutex_unlock(&inode->i_mutex);
current->backing_dev_info = NULL;
goto out_unlocked;
out:
mutex_unlock(&inode->i_mutex);
out_unlocked:
current->backing_dev_info = NULL;
return written ? written : err;
}