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author | Tao Ma <boyu.mt@taobao.com> | 2012-12-10 19:06:02 (GMT) |
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committer | Theodore Ts'o <tytso@mit.edu> | 2012-12-10 19:06:02 (GMT) |
commit | 941919856c11d4dd11d4fcabb4dab58bd2b146bf (patch) | |
tree | dcb06b13ca094575d9f32e49371560c1c956c874 /fs/ext4/inline.c | |
parent | 32f7f22c0b52e8189fef83986b16dc7abe95f2c4 (diff) | |
download | linux-fsl-qoriq-941919856c11d4dd11d4fcabb4dab58bd2b146bf.tar.xz |
ext4: let fiemap work with inline data
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>
Diffstat (limited to 'fs/ext4/inline.c')
-rw-r--r-- | fs/ext4/inline.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c index fc36299..bf5f778 100644 --- a/fs/ext4/inline.c +++ b/fs/ext4/inline.c @@ -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); +} |