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authorTheodore Ts'o <tytso@mit.edu>2014-02-20 05:15:15 +0400
committerTheodore Ts'o <tytso@mit.edu>2014-02-20 05:15:15 +0400
commit9a6633b1a3603ccdffec669033616f9ebb35a988 (patch)
tree48f84c6ddaf415831eee8245033af51454859738 /fs/ext4
parentce37c42919608e96ade3748fe23c3062a0a966c5 (diff)
downloadlinux-9a6633b1a3603ccdffec669033616f9ebb35a988.tar.xz
ext4: add ext4_es_store_pblock_status()
Avoid false positives by static code analysis tools such as sparse and coverity caused by the fact that we set the physical block, and then the status in the extent_status structure. It is also more efficient to set both of these values at once. Addresses-Coverity-Id: #989077 Addresses-Coverity-Id: #989078 Addresses-Coverity-Id: #1080722 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/extents_status.c14
-rw-r--r--fs/ext4/extents_status.h9
2 files changed, 15 insertions, 8 deletions
diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c
index 3981ff783950..a900004a63e1 100644
--- a/fs/ext4/extents_status.c
+++ b/fs/ext4/extents_status.c
@@ -658,8 +658,7 @@ int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
newes.es_lblk = lblk;
newes.es_len = len;
- ext4_es_store_pblock(&newes, pblk);
- ext4_es_store_status(&newes, status);
+ ext4_es_store_pblock_status(&newes, pblk, status);
trace_ext4_es_insert_extent(inode, &newes);
ext4_es_insert_extent_check(inode, &newes);
@@ -699,8 +698,7 @@ void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
newes.es_lblk = lblk;
newes.es_len = len;
- ext4_es_store_pblock(&newes, pblk);
- ext4_es_store_status(&newes, status);
+ ext4_es_store_pblock_status(&newes, pblk, status);
trace_ext4_es_cache_extent(inode, &newes);
if (!len)
@@ -812,13 +810,13 @@ retry:
newes.es_lblk = end + 1;
newes.es_len = len2;
+ block = 0x7FDEADBEEF;
if (ext4_es_is_written(&orig_es) ||
- ext4_es_is_unwritten(&orig_es)) {
+ ext4_es_is_unwritten(&orig_es))
block = ext4_es_pblock(&orig_es) +
orig_es.es_len - len2;
- ext4_es_store_pblock(&newes, block);
- }
- ext4_es_store_status(&newes, ext4_es_status(&orig_es));
+ ext4_es_store_pblock_status(&newes, block,
+ ext4_es_status(&orig_es));
err = __es_insert_extent(inode, &newes);
if (err) {
es->es_lblk = orig_es.es_lblk;
diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h
index 167f4ab8ecc3..f1b62a419920 100644
--- a/fs/ext4/extents_status.h
+++ b/fs/ext4/extents_status.h
@@ -129,6 +129,15 @@ static inline void ext4_es_store_status(struct extent_status *es,
(es->es_pblk & ~ES_MASK));
}
+static inline void ext4_es_store_pblock_status(struct extent_status *es,
+ ext4_fsblk_t pb,
+ unsigned int status)
+{
+ es->es_pblk = (((ext4_fsblk_t)
+ (status & EXTENT_STATUS_FLAGS) << ES_SHIFT) |
+ (pb & ~ES_MASK));
+}
+
extern void ext4_es_register_shrinker(struct ext4_sb_info *sbi);
extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
extern void ext4_es_lru_add(struct inode *inode);