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Commit d952d69e authored by Dmitry Monakhov's avatar Dmitry Monakhov Committed by Theodore Ts'o
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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: default avatarDmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent 5cc28a9e

fs/ext4/ext4.h

+1 −1
Original line number Diff line number Diff line
@@ -2634,7 +2634,7 @@ extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode, 
					int *retval);

extern int ext4_inline_data_fiemap(struct inode *inode,

				   struct fiemap_extent_info *fieinfo,

				   int *has_inline);

				   int *has_inline, __u64 start, __u64 len);

extern int ext4_try_to_evict_inline_data(handle_t *handle,

					 struct inode *inode,

					 int needed);

fs/ext4/extents.c

+2 −1
Original line number Diff line number Diff line
@@ -5151,7 +5151,8 @@ int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 
	if (ext4_has_inline_data(inode)) {

		int has_inline = 1;



		error = ext4_inline_data_fiemap(inode, fieinfo, &has_inline);

		error = ext4_inline_data_fiemap(inode, fieinfo, &has_inline,

						start, len);



		if (has_inline)

			return error;

fs/ext4/inline.c

+13 −6
Original line number Diff line number Diff line
@@ -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);