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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2008-11-24 05:51:53 +0100 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-11-24 05:51:53 +0100 |
| commit | b7be019e80da4db96d283734d55366014509911c (patch) | |
| tree | 86304f0c872dad5200e6015b7e7b56e53ad61ba8 /ipc | |
| parent | ext4: don't use blocks freed but not yet committed in buddy cache init (diff) | |
| download | linux-b7be019e80da4db96d283734d55366014509911c.tar.xz linux-b7be019e80da4db96d283734d55366014509911c.zip | |
ext4: Fix lockdep recursive locking warning
In ext4_mb_init_group(), if the filesystem block size is less than
PAGE_SIZE/2, the code tries to grab alloc_sem for multiple block
groups in a loop. We need to allow for this by using
down_write_nested() and passing in the loop index as a lock subclass
number. This works because no other code path needs to take multiple
alloc_sem's. Note that lockdep will fail for filesystem blocksize
smaller than to PAGE_SIZE/16k. (e.g., a 1k filesystem blocksize with
a 32k page size, or a 2k filesystem blocksize with a 64k blocksize,
etc.)
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'ipc')
0 files changed, 0 insertions, 0 deletions