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ext4: let fiemap work with inline data

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fiemap is used to find the disk layout of a file, as for inline data,
let us just pretend like a file with just one extent.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Tao Ma
2012-12-10 14:06:02 -05:00
committed by Theodore Ts'o
parent 32f7f22c0b
commit 941919856c
3 changed files with 54 additions and 0 deletions
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35
fs/ext4/inline.c
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@@ -15,6 +15,7 @@
#include "ext4.h"
#include "xattr.h"
#include "truncate.h"
#include <linux/fiemap.h>
#define EXT4_XATTR_SYSTEM_DATA "data"
#define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
@@ -1680,3 +1681,37 @@ int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
return ret;
}
int ext4_inline_data_fiemap(struct inode *inode,
struct fiemap_extent_info *fieinfo,
int *has_inline)
{
__u64 physical = 0;
__u64 length;
__u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_LAST;
int error = 0;
struct ext4_iloc iloc;
down_read(&EXT4_I(inode)->xattr_sem);
if (!ext4_has_inline_data(inode)) {
*has_inline = 0;
goto out;
}
error = ext4_get_inode_loc(inode, &iloc);
if (error)
goto out;
physical = 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);
brelse(iloc.bh);
out:
up_read(&EXT4_I(inode)->xattr_sem);
return (error < 0 ? error : 0);
}