Subject: + ocfs2-fix-the-end-cluster-offset-of-fiemap.patch added to -mm tree
To:
[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]
From: [email protected]
Date: Thu, 29 Aug 2013 13:37:47 -0700
The patch titled
Subject: ocfs2: fix the end cluster offset of FIEMAP
has been added to the -mm tree. Its filename is
ocfs2-fix-the-end-cluster-offset-of-fiemap.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ocfs2-fix-the-end-cluster-offset-of-fiemap.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ocfs2-fix-the-end-cluster-offset-of-fiemap.patch
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From: Jie Liu <[email protected]>
Subject: ocfs2: fix the end cluster offset of FIEMAP
Call fiemap ioctl(2) with given start offset as well as an desired mapping
range should show extents if possible. However, we somehow figure out the
end offset of mapping via 'mapping_end -= cpos' before iterating the
extent records which would cause problems if the given fiemap length is
too small to a cluster size, e.g,
Cluster size 4096:
debugfs.ocfs2 1.6.3
Block Size Bits: 12 Cluster Size Bits: 12
The extended fiemap test utility From David:
https://gist.github.com/anonymous/6172331
# dd if=/dev/urandom of=/ocfs2/test_file bs=1M count=1000
# ./fiemap /ocfs2/test_file 4096 10
start: 4096, length: 10
File /ocfs2/test_file has 0 extents:
# Logical Physical Length Flags
^^^^^ <-- No extent is shown
In this case, at ocfs2_fiemap(): cpos == mapping_end == 1. Hence the
loop of searching extent records was not executed at all.
This patch remove the in question 'mapping_end -= cpos', and loops
until the cpos is larger than the mapping_end as usual.
# ./fiemap /ocfs2/test_file 4096 10
start: 4096, length: 10
File /ocfs2/test_file has 1 extents:
# Logical Physical Length Flags
0: 0000000000000000 0000000056a01000 0000000006a00000 0000
Signed-off-by: Jie Liu <[email protected]>
Reported-by: David Weber <[email protected]>
Tested-by: David Weber <[email protected]>
Cc: Sunil Mushran <[email protected]>
Cc: Mark Fashen <[email protected]>
Cc: Joel Becker <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
fs/ocfs2/extent_map.c | 1 -
1 file changed, 1 deletion(-)
diff -puN fs/ocfs2/extent_map.c~ocfs2-fix-the-end-cluster-offset-of-fiemap
fs/ocfs2/extent_map.c
--- a/fs/ocfs2/extent_map.c~ocfs2-fix-the-end-cluster-offset-of-fiemap
+++ a/fs/ocfs2/extent_map.c
@@ -781,7 +781,6 @@ int ocfs2_fiemap(struct inode *inode, st
cpos = map_start >> osb->s_clustersize_bits;
mapping_end = ocfs2_clusters_for_bytes(inode->i_sb,
map_start + map_len);
- mapping_end -= cpos;
is_last = 0;
while (cpos < mapping_end && !is_last) {
u32 fe_flags;
_
Patches currently in -mm which might be from [email protected] are
ocfs2-should-call-ocfs2_journal_access_di-before-ocfs2_delete_entry-in-ocfs2_orphan_del.patch
ocfs2-llseek-requires-ocfs2-inode-lock-for-the-file-in-seek_end.patch
ocfs2-fix-issue-that-ocfs2_setattr-does-not-deal-with-new_i_size==i_size.patch
ocfs2-lighten-up-allocate-transaction.patch
ocfs2-using-i_size_read-to-access-i_size.patch
ocfs2-dlm_request_all_locks-should-deal-with-the-status-sent-from-target-node.patch
ocfs2-ac_bits_wanted-should-be-local_alloc_bits-when-returns-enospc.patch
ocfs2-use-list_for_each_entry-instead-of-list_for_each.patch
ocfs2-add-missing-return-value-check-of-ocfs2_get_clusters.patch
ocfs2-fix-a-memory-leak-in-__ocfs2_move_extents.patch
ocfs2-add-the-missing-return-value-check-of-ocfs2_xattr_get_clusters.patch
ocfs2-free-meta_ac-and-data_ac-when-ocfs2_start_trans-fails-in-ocfs2_xattr_set.patch
ocfs2-dlm-force-clean-refmap-when-doing-local-cleanup.patch
ocfs2-fix-possible-double-free-in-ocfs2_reflink_xattr_rec.patch
ocfs2-free-path-in-ocfs2_remove_inode_range.patch
ocfs2-fix-the-end-cluster-offset-of-fiemap.patch
binfmt_elfc-use-get_random_int-to-fix-entropy-depleting.patch
linux-next.patch
memcg-correct-resource_max-to-ullong_max.patch
memcg-rename-resource_max-to-res_counter_max.patch
memcg-avoid-overflow-caused-by-page_align.patch
memcg-reduce-function-dereference.patch
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