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>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 565e22d..a7aaa10 100644 (file)
--- 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 (file)
--- 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 (file)
--- 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 (file)
--- 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;