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ext4: Add iomap support for inline data

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Report inline data as a IOMAP_F_DATA_INLINE mapping.  This allows to use
iomap_seek_hole and iomap_seek_data in ext4_llseek and makes switching
to iomap_fiemap in ext4_fiemap easier.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Andreas Gruenbacher 2017-10-01 17:57:54 -04:00 committed by Theodore Ts'o
parent 9ca250a513
commit 7046ae3532
3 changed files with 51 additions and 2 deletions
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4
fs/ext4/ext4.h
View file

@ -3048,6 +3048,10 @@ extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
extern int ext4_inline_data_fiemap(struct inode *inode,
struct fiemap_extent_info *fieinfo,
int *has_inline, __u64 start, __u64 len);
struct iomap;
extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
extern int ext4_try_to_evict_inline_data(handle_t *handle,
struct inode *inode,
int needed);

33
fs/ext4/inline.c
View file

@ -12,6 +12,7 @@
* GNU General Public License for more details.
*/
#include <linux/iomap.h>
#include <linux/fiemap.h>
#include "ext4_jbd2.h"
@ -1827,6 +1828,38 @@ int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
return ret;
}
int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
{
__u64 addr;
int error = -EAGAIN;
struct ext4_iloc iloc;
down_read(&EXT4_I(inode)->xattr_sem);
if (!ext4_has_inline_data(inode))
goto out;
error = ext4_get_inode_loc(inode, &iloc);
if (error)
goto out;
addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
addr += offsetof(struct ext4_inode, i_block);
brelse(iloc.bh);
iomap->addr = addr;
iomap->offset = 0;
iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
i_size_read(inode));
iomap->type = 0;
iomap->flags = IOMAP_F_DATA_INLINE;
out:
up_read(&EXT4_I(inode)->xattr_sem);
return error;
}
int ext4_inline_data_fiemap(struct inode *inode,
struct fiemap_extent_info *fieinfo,
int *has_inline, __u64 start, __u64 len)

16
fs/ext4/inode.c
View file

@ -3404,8 +3404,20 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
struct ext4_map_blocks map;
int ret;
if (WARN_ON_ONCE(ext4_has_inline_data(inode)))
return -ERANGE;
if (flags & IOMAP_REPORT) {
if (ext4_has_inline_data(inode)) {
ret = ext4_inline_data_iomap(inode, iomap);
if (ret != -EAGAIN) {
if (ret == 0 && offset >= iomap->length)
ret = -ENOENT;
return ret;
}
}
} else {
if (WARN_ON_ONCE(ext4_has_inline_data(inode)))
return -ERANGE;
}
map.m_lblk = first_block;
map.m_len = last_block - first_block + 1;