Messages in this thread Patch in this message | | | From | Peng Tao <> | Subject | [PATCH 38/48] staging/lustre/lmv: fix duplicate directory entries | Date | Tue, 23 Jul 2013 00:06:59 +0800 |
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From: Ned Bass <bass6@llnl.gov>
Previously, I accidentally introduced a new way for duplicate directory entries to be returned from readdir(). That patch fails to properly decrement the nlupgs counter when breaking out of the inner-for loop. This accounting error causes an extra iteration of the inner-for loop when processing the next cfs page and a bad ldp_hash_end value is then saved in the lu_dirpage. To fix this, always decrement the nlupgs counter on entry into the inner loop.
Note: this bug only affects architectures with > 4k-sized pages, e.g. PowerPC.
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3182 Lustre-change: http://review.whamcloud.com/6405 Signed-off-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Fan Yong <fan.yong@intel.com> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Bobi Jam <bobijam@gmail.com> Signed-off-by: Peng Tao <tao.peng@emc.com> Signed-off-by: Andreas Dilger <andreas.dilger@intel.com> --- drivers/staging/lustre/lustre/lmv/lmv_obd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/lustre/lustre/lmv/lmv_obd.c b/drivers/staging/lustre/lustre/lmv/lmv_obd.c index 9e68eea..11c8d64 100644 --- a/drivers/staging/lustre/lustre/lmv/lmv_obd.c +++ b/drivers/staging/lustre/lustre/lmv/lmv_obd.c @@ -2157,7 +2157,7 @@ static void lmv_adjust_dirpages(struct page **pages, int ncfspgs, int nlupgs) __u64 hash_end = dp->ldp_hash_end; __u32 flags = dp->ldp_flags; - for (; nlupgs > 1; nlupgs--) { + while (--nlupgs > 0) { ent = lu_dirent_start(dp); for (end_dirent = ent; ent != NULL; end_dirent = ent, ent = lu_dirent_next(ent)); @@ -2191,6 +2191,7 @@ static void lmv_adjust_dirpages(struct page **pages, int ncfspgs, int nlupgs) kunmap(pages[i]); } + LASSERTF(nlupgs == 0, "left = %d", nlupgs); } #else #define lmv_adjust_dirpages(pages, ncfspgs, nlupgs) do {} while (0) -- 1.7.9.5
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