This starts hooking up fiemap.
Reporting delalloc extents may still be a bit dodgey, and the interface is
also supposed to flag the last extent in the file, which I've not yet
quiiiite worked out how to do. But here's the start.
Thanks,
-Eric
Index: linux-2.6.27.x86_64/fs/xfs/linux-2.6/xfs_iops.c
===================================================================
--- linux-2.6.27.x86_64.orig/fs/xfs/linux-2.6/xfs_iops.c
+++ linux-2.6.27.x86_64/fs/xfs/linux-2.6/xfs_iops.c
@@ -53,6 +53,7 @@
#include <linux/namei.h>
#include <linux/security.h>
#include <linux/falloc.h>
+#include <linux/fiemap.h>
/*
* Bring the atime in the XFS inode uptodate.
@@ -661,6 +662,78 @@ out_error:
return error;
}
+#define XFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
+
+STATIC int xfs_fiemap_format(
+ void **arg,
+ struct getbmapx *bmv,
+ int *filled)
+{
+ int error = 0;
+ struct fiemap_extent_info *fieinfo= *arg;
+ u32 fiemap_flags = 0;
+ u64 logical, physical, length;
+
+ *filled = 0;
+ /* Do nothing for a hole */
+ if (bmv->bmv_block == -1LL)
+ return 0;
+
+ logical = BBTOB(bmv->bmv_offset);
+ physical = BBTOB(bmv->bmv_block);
+ length = BBTOB(bmv->bmv_length);
+
+ if (bmv->bmv_oflags & BMV_OF_PREALLOC)
+ fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN;
+ if (bmv->bmv_oflags & BMV_OF_DELALLOC) {
+ fiemap_flags |= FIEMAP_EXTENT_DELALLOC;
+ physical = 0; /* no block yet */
+ }
+
+ error = fiemap_fill_next_extent(fieinfo, logical, physical,
+ length, fiemap_flags);
+ if (error < 0)
+ return -error;
+ *filled = 1;
+ return 0;
+}
+
+STATIC int
+xfs_vn_fiemap(
+ struct inode *inode,
+ struct fiemap_extent_info *fieinfo,
+ u64 start,
+ u64 length)
+{
+ xfs_inode_t *ip = XFS_I(inode);
+ struct getbmapx bm;
+ int error;
+
+ if (fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS))
+ return -EBADR;
+
+ /* Set up bmap header for xfs internal routine */
+ bm.bmv_offset = BTOBB(start);
+ /* Special case for whole file */ /* XXX ERS needed? */
+ if (length == ~0ULL)
+ bm.bmv_length = -1LL;
+ else
+ bm.bmv_length = BTOBB(length);
+ /* xfs_getbmap takes count as header + array */
+ bm.bmv_count = fieinfo->fi_extents_max + 1;
+ bm.bmv_iflags = BMV_IF_PREALLOC;
+ if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
+ bm.bmv_iflags |= BMV_IF_ATTRFORK;
+ if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC))
+ bm.bmv_iflags |= BMV_IF_DELALLOC;
+
+ error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo);
+ if (error)
+ return -XFS_ERROR(error);
+
+ return 0;
+}
+
static const struct inode_operations xfs_inode_operations = {
.permission = xfs_vn_permission,
.truncate = xfs_vn_truncate,
@@ -671,6 +744,7 @@ static const struct inode_operations xfs
.removexattr = generic_removexattr,
.listxattr = xfs_vn_listxattr,
.fallocate = xfs_vn_fallocate,
+ .fiemap = xfs_vn_fiemap,
};
static const struct inode_operations xfs_dir_inode_operations = {
Index: linux-2.6.27.x86_64/fs/xfs/xfs_bmap.c
===================================================================
--- linux-2.6.27.x86_64.orig/fs/xfs/xfs_bmap.c
+++ linux-2.6.27.x86_64/fs/xfs/xfs_bmap.c
@@ -5819,6 +5819,7 @@ xfs_getbmap(
* preallocated data space */
int sh_unwritten; /* true, if unwritten */
/* extents listed separately */
+ int sh_delalloc; /* show delayed extents */
int iflags; /* interface flags */
int bmapi_flags; /* flags for xfs_bmapi */
@@ -5827,6 +5828,7 @@ xfs_getbmap(
whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
sh_unwritten = (iflags & BMV_IF_PREALLOC) != 0;
+ sh_delalloc = (iflags & BMV_IF_DELALLOC) != 0;
/* If the BMV_IF_NO_DMAPI_READ interface bit specified, do not
* generate a DMAPI read event. Otherwise, if the DM_EVENT_READ
@@ -5897,7 +5899,7 @@ xfs_getbmap(
xfs_ilock(ip, XFS_IOLOCK_SHARED);
- if (whichfork == XFS_DATA_FORK &&
+ if (!sh_delalloc && (whichfork == XFS_DATA_FORK) &&
(ip->i_delayed_blks || ip->i_size > ip->i_d.di_size)) {
/* xfs_fsize_t last_byte = xfs_file_last_byte(ip); */
error = xfs_flush_pages(ip, (xfs_off_t)0,
@@ -5930,7 +5932,7 @@ xfs_getbmap(
bmv->bmv_entries = 0;
- if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0) {
+ if (!sh_delalloc && (XFS_IFORK_NEXTENTS(ip, whichfork) == 0)) {
error = 0;
goto unlock_and_return;
}
@@ -5948,12 +5950,15 @@ xfs_getbmap(
ASSERT(nmap <= subnex);
for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
- out.bmv_oflags = (map[i].br_state == XFS_EXT_UNWRITTEN)
?
- BMV_OF_PREALLOC : 0;
+ out.bmv_oflags = 0;
+ if (map[i].br_state == XFS_EXT_UNWRITTEN)
+ out.bmv_oflags |= BMV_OF_PREALLOC;
+ else if (map[i].br_startblock == DELAYSTARTBLOCK)
+ out.bmv_oflags |= BMV_OF_DELALLOC;
out.bmv_offset = XFS_FSB_TO_BB(mp, map[i].br_startoff);
out.bmv_length = XFS_FSB_TO_BB(mp,
map[i].br_blockcount);
out.bmv_unused1 = out.bmv_unused2 = 0;
- ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
+ ASSERT(sh_delalloc || (map[i].br_startblock !=
DELAYSTARTBLOCK));
if (map[i].br_startblock == HOLESTARTBLOCK &&
whichfork == XFS_ATTR_FORK) {
/* came to the end of attribute fork */
Index: linux-2.6.27.x86_64/fs/xfs/xfs_fs.h
===================================================================
--- linux-2.6.27.x86_64.orig/fs/xfs/xfs_fs.h
+++ linux-2.6.27.x86_64/fs/xfs/xfs_fs.h
@@ -113,10 +113,13 @@ struct getbmapx {
#define BMV_IF_ATTRFORK 0x1 /* return attr fork rather than
data */
#define BMV_IF_NO_DMAPI_READ 0x2 /* Do not generate DMAPI read event */
#define BMV_IF_PREALLOC 0x4 /* rtn status BMV_OF_PREALLOC
if req */
-#define BMV_IF_VALID (BMV_IF_ATTRFORK|BMV_IF_NO_DMAPI_READ|BMV_IF_PREALLOC)
+#define BMV_IF_DELALLOC 0x8 /* rtn status BMV_OF_DELALLOC
if req */
+#define BMV_IF_VALID \
+ (BMV_IF_ATTRFORK|BMV_IF_NO_DMAPI_READ|BMV_IF_PREALLOC|BMV_IF_DELALLOC)
/* bmv_oflags values - returned for for each non-header segment */
#define BMV_OF_PREALLOC 0x1 /* segment = unwritten
pre-allocation */
+#define BMV_OF_DELALLOC 0x2 /* segment = delayed allocation
*/
/*
* Structure for XFS_IOC_FSSETDM.
|