diff options
Diffstat (limited to 'fs/btrfs/inode.c')
| -rw-r--r-- | fs/btrfs/inode.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 2cb2dd3..2817570 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -148,6 +148,7 @@ static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) u64 bytenr; u64 cow_end; u64 loops = 0; + u64 total_fs_bytes; struct btrfs_root *root = BTRFS_I(inode)->root; struct extent_buffer *leaf; int found_type; @@ -157,6 +158,7 @@ static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) int err; struct btrfs_key found_key; + total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); path = btrfs_alloc_path(); BUG_ON(!path); again: @@ -189,8 +191,10 @@ again: found_type = btrfs_file_extent_type(leaf, item); extent_start = found_key.offset; if (found_type == BTRFS_FILE_EXTENT_REG) { - extent_end = extent_start + - btrfs_file_extent_num_bytes(leaf, item); + u64 extent_num_bytes; + + extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item); + extent_end = extent_start + extent_num_bytes; err = 0; if (loops && start != extent_start) @@ -204,6 +208,13 @@ again: if (bytenr == 0) goto not_found; + /* + * we may be called by the resizer, make sure we're inside + * the limits of the FS + */ + if (bytenr + extent_num_bytes > total_fs_bytes) + goto not_found; + if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) { goto not_found; } |
