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Btrfs: fix uncheck memory allocations 

To make Btrfs code more robust, several return value checks where memory
allocation can fail are introduced. I use BUG_ON where I don't know how
to handle the error properly, which increases the number of using the
notorious BUG_ON, though.

Signed-off-by: Yoshinori Sano <yoshinori.sano@gmail.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yoshinori Sano 2011-02-15 12:01:42 +00:00 committed by root
parent c622ae6085
commit dac97e516c
3 changed files with 12 additions and 0 deletions
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6
fs/btrfs/compression.c
View File

@ -340,6 +340,8 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
WARN_ON(start & ((u64)PAGE_CACHE_SIZE - 1));
cb = kmalloc(compressed_bio_size(root, compressed_len), GFP_NOFS);
if (!cb)
return -ENOMEM;
atomic_set(&cb->pending_bios, 0);
cb->errors = 0;
cb->inode = inode;
@ -354,6 +356,10 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
bio = compressed_bio_alloc(bdev, first_byte, GFP_NOFS);
if(!bio) {
kfree(cb);
return -ENOMEM;
}
bio->bi_private = cb;
bio->bi_end_io = end_compressed_bio_write;
atomic_inc(&cb->pending_bios);

4
fs/btrfs/extent-tree.c
View File

@ -6978,6 +6978,10 @@ static noinline int get_new_locations(struct inode *reloc_inode,
struct disk_extent *old = exts;
max *= 2;
exts = kzalloc(sizeof(*exts) * max, GFP_NOFS);
if (!exts) {
ret = -ENOMEM;
goto out;
}
memcpy(exts, old, sizeof(*exts) * nr);
if (old != *extents)
kfree(old);

2
fs/btrfs/inode.c
View File

@ -290,6 +290,7 @@ static noinline int add_async_extent(struct async_cow *cow,
struct async_extent *async_extent;
async_extent = kmalloc(sizeof(*async_extent), GFP_NOFS);
BUG_ON(!async_extent);
async_extent->start = start;
async_extent->ram_size = ram_size;
async_extent->compressed_size = compressed_size;
@ -388,6 +389,7 @@ again:
(BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS))) {
WARN_ON(pages);
pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS);
BUG_ON(!pages);
if (BTRFS_I(inode)->force_compress)
compress_type = BTRFS_I(inode)->force_compress;