diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-04-12 13:00:44 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-04-12 13:00:44 -0700 |
commit | 4ac1800f81eb52f776aca201e791eec2ef355259 (patch) | |
tree | 032e7be62091aa106e83307c805d1180db57ebd8 /fs/gfs2/glock.c | |
parent | a1bf4c7da62fcadea065f7c9a561d61c26ea4882 (diff) | |
parent | 3e7aafc39c59c639ebd5961f893743f076df9b4e (diff) |
Merge tag 'gfs2-4.17.fixes2' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2
Pull more gfs2 updates from Bob Peterson:
"We decided to request the latest three patches to be merged into this
merge window while it's still open.
- The first patch adds a new function to lockref:
lockref_put_not_zero
- The second patch fixes GFS2's glock dump code so it uses the new
lockref function. This fixes a problem whereby lock dumps could
miss glocks.
- I made a minor patch to update some comments and fix the lock
ordering text in our gfs2-glocks.txt Documentation file"
* tag 'gfs2-4.17.fixes2' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
GFS2: Minor improvements to comments and documentation
gfs2: Stop using rhashtable_walk_peek
lockref: Add lockref_put_not_zero
Diffstat (limited to 'fs/gfs2/glock.c')
-rw-r--r-- | fs/gfs2/glock.c | 47 |
1 files changed, 28 insertions, 19 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index 82fb5583445c..097bd3c0f270 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -1923,28 +1923,37 @@ void gfs2_glock_exit(void) static void gfs2_glock_iter_next(struct gfs2_glock_iter *gi, loff_t n) { - if (n == 0) - gi->gl = rhashtable_walk_peek(&gi->hti); - else { - gi->gl = rhashtable_walk_next(&gi->hti); - n--; + struct gfs2_glock *gl = gi->gl; + + if (gl) { + if (n == 0) + return; + if (!lockref_put_not_zero(&gl->gl_lockref)) + gfs2_glock_queue_put(gl); } for (;;) { - if (IS_ERR_OR_NULL(gi->gl)) { - if (!gi->gl) - return; - if (PTR_ERR(gi->gl) != -EAGAIN) { - gi->gl = NULL; - return; + gl = rhashtable_walk_next(&gi->hti); + if (IS_ERR_OR_NULL(gl)) { + if (gl == ERR_PTR(-EAGAIN)) { + n = 1; + continue; } - n = 0; - } else if (gi->sdp == gi->gl->gl_name.ln_sbd && - !__lockref_is_dead(&gi->gl->gl_lockref)) { - if (!n--) - break; + gl = NULL; + break; + } + if (gl->gl_name.ln_sbd != gi->sdp) + continue; + if (n <= 1) { + if (!lockref_get_not_dead(&gl->gl_lockref)) + continue; + break; + } else { + if (__lockref_is_dead(&gl->gl_lockref)) + continue; + n--; } - gi->gl = rhashtable_walk_next(&gi->hti); } + gi->gl = gl; } static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos) @@ -1988,7 +1997,6 @@ static void gfs2_glock_seq_stop(struct seq_file *seq, void *iter_ptr) { struct gfs2_glock_iter *gi = seq->private; - gi->gl = NULL; rhashtable_walk_stop(&gi->hti); } @@ -2076,7 +2084,8 @@ static int gfs2_glocks_release(struct inode *inode, struct file *file) struct seq_file *seq = file->private_data; struct gfs2_glock_iter *gi = seq->private; - gi->gl = NULL; + if (gi->gl) + gfs2_glock_put(gi->gl); rhashtable_walk_exit(&gi->hti); return seq_release_private(inode, file); } |