Teach FIEMAP to report shared (i.e. reflinked) extents.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/xfs_bmap_util.c | 2 +
fs/xfs/xfs_bmap_util.h | 3 +-
fs/xfs/xfs_ioctl.c | 12 +++++++-
fs/xfs/xfs_iops.c | 68 ++++++++++++++++++++++++++++++++++++++++--------
4 files changed, 69 insertions(+), 16 deletions(-)
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 3e274f6..61d616e 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -742,7 +742,7 @@ xfs_getbmap(
int full = 0; /* user array is full */
/* format results & advance arg */
- error = formatter(&arg, &out[i], &full);
+ error = formatter(ip, &arg, &out[i], &full);
if (error || full)
break;
}
diff --git a/fs/xfs/xfs_bmap_util.h b/fs/xfs/xfs_bmap_util.h
index af97d9a..d0dc504 100644
--- a/fs/xfs/xfs_bmap_util.h
+++ b/fs/xfs/xfs_bmap_util.h
@@ -37,7 +37,8 @@ int xfs_bmap_punch_delalloc_range(struct xfs_inode *ip,
xfs_fileoff_t start_fsb, xfs_fileoff_t length);
/* bmap to userspace formatter - copy to user & advance pointer */
-typedef int (*xfs_bmap_format_t)(void **, struct getbmapx *, int *);
+typedef int (*xfs_bmap_format_t)(struct xfs_inode *, void **, struct getbmapx *,
+ int *);
int xfs_getbmap(struct xfs_inode *ip, struct getbmapx *bmv,
xfs_bmap_format_t formatter, void *arg);
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 07c4eb6..cf712641 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1362,7 +1362,11 @@ out_drop_write:
}
STATIC int
-xfs_getbmap_format(void **ap, struct getbmapx *bmv, int *full)
+xfs_getbmap_format(
+ struct xfs_inode *ip,
+ void **ap,
+ struct getbmapx *bmv,
+ int *full)
{
struct getbmap __user *base = (struct getbmap __user *)*ap;
@@ -1406,7 +1410,11 @@ xfs_ioc_getbmap(
}
STATIC int
-xfs_getbmapx_format(void **ap, struct getbmapx *bmv, int *full)
+xfs_getbmapx_format(
+ struct xfs_inode *ip,
+ void **ap,
+ struct getbmapx *bmv,
+ int *full)
{
struct getbmapx __user *base = (struct getbmapx __user *)*ap;
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 245268a..ff1341c 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -38,6 +38,8 @@
#include "xfs_dir2.h"
#include "xfs_trans_space.h"
#include "xfs_pnfs.h"
+#include "xfs_bit.h"
+#include "xfs_refcount.h"
#include <linux/capability.h>
#include <linux/xattr.h>
@@ -1014,14 +1016,23 @@ xfs_vn_update_time(
*/
STATIC int
xfs_fiemap_format(
+ struct xfs_inode *ip,
void **arg,
struct getbmapx *bmv,
int *full)
{
- int error;
+ int error = 0;
struct fiemap_extent_info *fieinfo = *arg;
u32 fiemap_flags = 0;
- u64 logical, physical, length;
+ u64 logical, physical, length, loop_len, len;
+ xfs_agblock_t ebno;
+ xfs_extlen_t elen;
+ xfs_nlink_t nr;
+ xfs_fsblock_t fsbno;
+ xfs_agnumber_t agno;
+ xfs_agblock_t agbno;
+ xfs_extlen_t aglen;
+ struct xfs_mount *mp = ip->i_mount;
/* Do nothing for a hole */
if (bmv->bmv_block == -1LL)
@@ -1029,7 +1040,7 @@ xfs_fiemap_format(
logical = BBTOB(bmv->bmv_offset);
physical = BBTOB(bmv->bmv_block);
- length = BBTOB(bmv->bmv_length);
+ length = loop_len = BBTOB(bmv->bmv_length);
if (bmv->bmv_oflags & BMV_OF_PREALLOC)
fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN;
@@ -1038,16 +1049,49 @@ xfs_fiemap_format(
FIEMAP_EXTENT_UNKNOWN);
physical = 0; /* no block yet */
}
- if (bmv->bmv_oflags & BMV_OF_LAST)
- fiemap_flags |= FIEMAP_EXTENT_LAST;
-
- error = fiemap_fill_next_extent(fieinfo, logical, physical,
- length, fiemap_flags);
- if (error > 0) {
- error = 0;
- *full = 1; /* user array now full */
- }
+ while (loop_len > 0) {
+ u32 ext_flags = 0;
+
+ if (bmv->bmv_oflags & BMV_OF_DELALLOC) {
+ physical = 0;
+ len = loop_len;
+ nr = 1;
+ } else if (xfs_is_reflink_inode(ip)) {
+ fsbno = XFS_DADDR_TO_FSB(mp, BTOBB(physical));
+ agno = XFS_FSB_TO_AGNO(mp, fsbno);
+ agbno = XFS_FSB_TO_AGBNO(mp, fsbno);
+ aglen = XFS_B_TO_FSB(mp, loop_len);
+ error = xfs_refcount_find_shared(mp, agno, agbno, aglen,
+ &ebno, &elen, true);
+ if (error)
+ goto out;
+ if (elen == 0) {
+ len = loop_len;
+ } else if (ebno == agbno) {
+ len = XFS_FSB_TO_B(mp, elen);
+ ext_flags |= FIEMAP_EXTENT_SHARED;
+ } else {
+ len = XFS_FSB_TO_B(mp, ebno - agbno);
+ }
+ } else
+ len = loop_len;
+ if ((bmv->bmv_oflags & BMV_OF_LAST) &&
+ len == loop_len)
+ ext_flags |= FIEMAP_EXTENT_LAST;
+
+ error = fiemap_fill_next_extent(fieinfo, logical, physical,
+ len, fiemap_flags | ext_flags);
+ if (error > 0) {
+ error = 0;
+ *full = 1; /* user array now full */
+ goto out;
+ }
+ logical += len;
+ physical += len;
+ loop_len -= len;
+ }
+out:
return error;
}
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