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| author | Bob Peterson <rpeterso@redhat.com> | 2011-03-17 16:19:58 -0400 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2011-04-18 15:23:50 +0100 |
| commit | 44ad37d69b2cc421d5b5c7ad7fed16230685b092 (patch) | |
| tree | 3632c63eef9e159947316f18d48054f082c0578e /fs/gfs2/rgrp.c | |
| parent | 001e8e8df4283dd4ef7a0297c012fce364c05cf1 (diff) | |
| download | lwn-44ad37d69b2cc421d5b5c7ad7fed16230685b092.tar.gz lwn-44ad37d69b2cc421d5b5c7ad7fed16230685b092.zip | |
GFS2: filesystem hang caused by incorrect lock order
This patch fixes a deadlock in GFS2 where two processes are trying
to reclaim an unlinked dinode:
One holds the inode glock and calls gfs2_lookup_by_inum trying to look
up the inode, which it can't, due to I_FREEING. The other has set
I_FREEING from vfs and is at the beginning of gfs2_delete_inode
waiting for the glock, which is held by the first. The solution is to
add a new non_block parameter to the gfs2_iget function that causes it
to return -ENOENT if the inode is being freed.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/rgrp.c')
| -rw-r--r-- | fs/gfs2/rgrp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index cf930cd9664a..6fcae8469f6d 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -945,7 +945,7 @@ static void try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked, u64 skip /* rgblk_search can return a block < goal, so we need to keep it marching forward. */ no_addr = block + rgd->rd_data0; - goal++; + goal = max(block + 1, goal + 1); if (*last_unlinked != NO_BLOCK && no_addr <= *last_unlinked) continue; if (no_addr == skip) @@ -971,7 +971,7 @@ static void try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked, u64 skip found++; /* Limit reclaim to sensible number of tasks */ - if (found > 2*NR_CPUS) + if (found > NR_CPUS) return; } |