From d952d69e268f833c85c0bafee9f67f9dba85044b Mon Sep 17 00:00:00 2001 From: Dmitry Monakhov Date: Tue, 2 Dec 2014 16:11:20 -0500 Subject: ext4: ext4_inline_data_fiemap should respect callers argument Currently ext4_inline_data_fiemap ignores requested arguments (start and len) which may lead endless loop if start != 0. Also fix incorrect extent length determination. Signed-off-by: Dmitry Monakhov Signed-off-by: Theodore Ts'o --- fs/ext4/inline.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) (limited to 'fs/ext4/inline.c') diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c index efdcede40c22..b32d77bfb3a1 100644 --- a/fs/ext4/inline.c +++ b/fs/ext4/inline.c @@ -1808,11 +1808,12 @@ int ext4_destroy_inline_data(handle_t *handle, struct inode *inode) int ext4_inline_data_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, - int *has_inline) + int *has_inline, __u64 start, __u64 len) { __u64 physical = 0; - __u64 length; - __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_LAST; + __u64 inline_len; + __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED | + FIEMAP_EXTENT_LAST; int error = 0; struct ext4_iloc iloc; @@ -1821,6 +1822,13 @@ int ext4_inline_data_fiemap(struct inode *inode, *has_inline = 0; goto out; } + inline_len = min_t(size_t, ext4_get_inline_size(inode), + i_size_read(inode)); + if (start >= inline_len) + goto out; + if (start + len < inline_len) + inline_len = start + len; + inline_len -= start; error = ext4_get_inode_loc(inode, &iloc); if (error) @@ -1829,11 +1837,10 @@ int ext4_inline_data_fiemap(struct inode *inode, physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits; physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data; physical += offsetof(struct ext4_inode, i_block); - length = i_size_read(inode); if (physical) - error = fiemap_fill_next_extent(fieinfo, 0, physical, - length, flags); + error = fiemap_fill_next_extent(fieinfo, start, physical, + inline_len, flags); brelse(iloc.bh); out: up_read(&EXT4_I(inode)->xattr_sem); -- cgit v1.2.3