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f2fs: bugfix for alloc_nid_failed() 

Directly drop the free_nid cache when nm_i->fcnt > 2 * MAX_FREE_NIDS

Since there is NOT nmi->free_nid_list_lock spinlock protection between
a sequential calling of alloc_nid() and alloc_nid_failed(), some other
threads may already add new free_nid to the free_nid_list during this
period.

We need to make sure nmi->fcnt is never > 2 * MAX_FREE_NIDS.

Signed-off-by: Haicheng Li <haicheng.li@linux.intel.com>
[Jaegeuk Kim: fit the coding style]
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Haicheng Li 2013-05-06 23:15:41 +08:00 committed by Jaegeuk Kim
parent 047184b42b
commit 95630cbadc
1 changed files with 6 additions and 2 deletions
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8
fs/f2fs/node.c
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@ -1439,8 +1439,12 @@ void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
spin_lock(&nm_i->free_nid_list_lock);
i = __lookup_free_nid_list(nid, &nm_i->free_nid_list);
BUG_ON(!i || i->state != NID_ALLOC);
i->state = NID_NEW;
nm_i->fcnt++;
if (nm_i->fcnt > 2 * MAX_FREE_NIDS) {
__del_from_free_nid_list(i);
} else {
i->state = NID_NEW;
nm_i->fcnt++;
}
spin_unlock(&nm_i->free_nid_list_lock);
}