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| author | Tsutomu Itoh <t-itoh@jp.fujitsu.com> | 2011-02-14 00:45:29 +0000 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2011-02-14 16:21:37 -0500 |
| commit | c26a920373a983b52223eed5a13b97404d8b4158 (patch) | |
| tree | a7f76fe1b0cecbc712f0b152ff537805f126b113 | |
| parent | 67100f255dba284bcbb5ce795355dad1cff35658 (diff) | |
| download | op-kernel-dev-c26a920373a983b52223eed5a13b97404d8b4158.zip op-kernel-dev-c26a920373a983b52223eed5a13b97404d8b4158.tar.gz | |
Btrfs: check return value of alloc_extent_map()
I add the check on the return value of alloc_extent_map() to several places.
In addition, alloc_extent_map() returns only the address or NULL.
Therefore, check by IS_ERR() is unnecessary. So, I remove IS_ERR() checking.
Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
| -rw-r--r-- | fs/btrfs/extent-tree.c | 2 | ||||
| -rw-r--r-- | fs/btrfs/extent_map.c | 4 | ||||
| -rw-r--r-- | fs/btrfs/file.c | 1 | ||||
| -rw-r--r-- | fs/btrfs/inode.c | 3 |
4 files changed, 7 insertions, 3 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 565e22d..a7aaa10 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -6584,7 +6584,7 @@ static noinline int relocate_data_extent(struct inode *reloc_inode, u64 end = start + extent_key->offset - 1; em = alloc_extent_map(GFP_NOFS); - BUG_ON(!em || IS_ERR(em)); + BUG_ON(!em); em->start = start; em->len = extent_key->offset; diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c index b0e1fce..2b6c12e 100644 --- a/fs/btrfs/extent_map.c +++ b/fs/btrfs/extent_map.c @@ -51,8 +51,8 @@ struct extent_map *alloc_extent_map(gfp_t mask) { struct extent_map *em; em = kmem_cache_alloc(extent_map_cache, mask); - if (!em || IS_ERR(em)) - return em; + if (!em) + return NULL; em->in_tree = 0; em->flags = 0; em->compress_type = BTRFS_COMPRESS_NONE; diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index b0ff34b..65338a1 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -185,6 +185,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end, split = alloc_extent_map(GFP_NOFS); if (!split2) split2 = alloc_extent_map(GFP_NOFS); + BUG_ON(!split || !split2); write_lock(&em_tree->lock); em = lookup_extent_mapping(em_tree, start, len); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index c9bc0af..8d392ed 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -644,6 +644,7 @@ retry: async_extent->ram_size - 1, 0); em = alloc_extent_map(GFP_NOFS); + BUG_ON(!em); em->start = async_extent->start; em->len = async_extent->ram_size; em->orig_start = em->start; @@ -820,6 +821,7 @@ static noinline int cow_file_range(struct inode *inode, BUG_ON(ret); em = alloc_extent_map(GFP_NOFS); + BUG_ON(!em); em->start = start; em->orig_start = em->start; ram_size = ins.offset; @@ -1169,6 +1171,7 @@ out_check: struct extent_map_tree *em_tree; em_tree = &BTRFS_I(inode)->extent_tree; em = alloc_extent_map(GFP_NOFS); + BUG_ON(!em); em->start = cur_offset; em->orig_start = em->start; em->len = num_bytes; |
