Btrfs: Fix oops for defrag with compression turned on

When we defrag a file, whose size can be fit into an inline extent,
with compression enabled, the compress type is set to be
fs_info->compress_type, which is 0 if the btrfs filesystem is mounted
without compress option. This leads to oops.

Reported-by: Daniel Blueman <daniel.blueman@gmail.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 0627418..62ae9d5 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -111,6 +111,7 @@ static int btrfs_init_inode_security(struct btrfs_trans_handle *trans,
 static noinline int insert_inline_extent(struct btrfs_trans_handle *trans,
                                struct btrfs_root *root, struct inode *inode,
                                u64 start, size_t size, size_t compressed_size,
+                               int compress_type,
                                struct page **compressed_pages)
 {
        struct btrfs_key key;
@@ -125,12 +126,9 @@ static noinline int insert_inline_extent(struct btrfs_trans_handle *trans,
        size_t cur_size = size;
        size_t datasize;
        unsigned long offset;
-       int compress_type = BTRFS_COMPRESS_NONE;
 
-       if (compressed_size && compressed_pages) {
-               compress_type = root->fs_info->compress_type;
+       if (compressed_size && compressed_pages)
                cur_size = compressed_size;
-       }
 
        path = btrfs_alloc_path();
        if (!path)
@@ -220,7 +218,7 @@ fail:
 static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans,
                                 struct btrfs_root *root,
                                 struct inode *inode, u64 start, u64 end,
-                                size_t compressed_size,
+                                size_t compressed_size, int compress_type,
                                 struct page **compressed_pages)
 {
        u64 isize = i_size_read(inode);
@@ -253,7 +251,7 @@ static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans,
                inline_len = min_t(u64, isize, actual_end);
        ret = insert_inline_extent(trans, root, inode, start,
                                   inline_len, compressed_size,
-                                  compressed_pages);
+                                  compress_type, compressed_pages);
        BUG_ON(ret);
        btrfs_delalloc_release_metadata(inode, end + 1 - start);
        btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0);
@@ -432,12 +430,13 @@ again:
                         * to make an uncompressed inline extent.
                         */
                        ret = cow_file_range_inline(trans, root, inode,
-                                                   start, end, 0, NULL);
+                                                   start, end, 0, 0, NULL);
                } else {
                        /* try making a compressed inline extent */
                        ret = cow_file_range_inline(trans, root, inode,
                                                    start, end,
-                                                   total_compressed, pages);
+                                                   total_compressed,
+                                                   compress_type, pages);
                }
                if (ret == 0) {
                        /*
@@ -791,7 +790,7 @@ static noinline int cow_file_range(struct inode *inode,
        if (start == 0) {
                /* lets try to make an inline extent */
                ret = cow_file_range_inline(trans, root, inode,
-                                           start, end, 0, NULL);
+                                           start, end, 0, 0, NULL);
                if (ret == 0) {
                        extent_clear_unlock_delalloc(inode,
                                     &BTRFS_I(inode)->io_tree,