diff options
Diffstat (limited to 'fs/btrfs/compression.c')
| -rw-r--r-- | fs/btrfs/compression.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index b2b94009959d..3c9e22b5481f 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -974,6 +974,29 @@ static unsigned int btrfs_compress_set_level(int type, unsigned level) return level; } +/* Wrapper around find_get_page(), with extra error message. */ +int btrfs_compress_find_get_page(struct address_space *mapping, u64 start, + struct page **in_page_ret) +{ + struct page *in_page; + + /* + * The compressed write path should have the page locked already, thus + * we only need to grab one reference of the page cache. + */ + in_page = find_get_page(mapping, start >> PAGE_SHIFT); + if (unlikely(!in_page)) { + struct btrfs_inode *inode = BTRFS_I(mapping->host); + + btrfs_crit(inode->root->fs_info, + "failed to get page cache, root %lld ino %llu file offset %llu", + inode->root->root_key.objectid, btrfs_ino(inode), start); + return -ENOENT; + } + *in_page_ret = in_page; + return 0; +} + /* * Given an address space and start and length, compress the bytes into @pages * that are allocated on demand. |