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btrfs: Fix error handling in zlib 

Return failure if alloc_page() fails to allocate memory,
and the upper code will just give up compression.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
This commit is contained in:
Li Zefan 2010-11-09 08:27:27 +08:00
parent 8844355df7
commit 4b72029dc3
1 changed files with 8 additions and 0 deletions
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8
fs/btrfs/zlib.c
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@ -225,6 +225,10 @@ int btrfs_zlib_compress_pages(struct address_space *mapping,
data_in = kmap(in_page);
out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
if (out_page == NULL) {
ret = -1;
goto out;
}
cpage_out = kmap(out_page);
pages[0] = out_page;
nr_pages = 1;
@ -263,6 +267,10 @@ int btrfs_zlib_compress_pages(struct address_space *mapping,
goto out;
}
out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
if (out_page == NULL) {
ret = -1;
goto out;
}
cpage_out = kmap(out_page);
pages[nr_pages] = out_page;
nr_pages++;