Commit f35642e2 authored by Eric Sandeen's avatar Eric Sandeen Committed by Niv Sardi

[XFS] Hook up the fiemap ioctl.

This adds the fiemap inode_operation, which for us converts the
fiemap values & flags into a getbmapx structure which can be sent
to xfs_getbmap.  The formatter then copies the bmv array back into
the user's fiemap buffer via the fiemap helpers.

If we wanted to be more clever, we could also return mapping data
for in-inode attributes, but I'm not terribly motivated to do that
just yet.
Signed-off-by: default avatarEric Sandeen <sandeen@sandeen.net>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarNiv Sardi <xaiki@sgi.com>
parent 5af317c9
...@@ -53,6 +53,7 @@ ...@@ -53,6 +53,7 @@
#include <linux/namei.h> #include <linux/namei.h>
#include <linux/security.h> #include <linux/security.h>
#include <linux/falloc.h> #include <linux/falloc.h>
#include <linux/fiemap.h>
/* /*
* Bring the atime in the XFS inode uptodate. * Bring the atime in the XFS inode uptodate.
...@@ -661,6 +662,88 @@ xfs_vn_fallocate( ...@@ -661,6 +662,88 @@ xfs_vn_fallocate(
return error; return error;
} }
#define XFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
/*
* Call fiemap helper to fill in user data.
* Returns positive errors to xfs_getbmap.
*/
STATIC int
xfs_fiemap_format(
void **arg,
struct getbmapx *bmv,
int *full)
{
int error;
struct fiemap_extent_info *fieinfo = *arg;
u32 fiemap_flags = 0;
u64 logical, physical, length;
/* 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;
else if (bmv->bmv_oflags & BMV_OF_DELALLOC) {
fiemap_flags |= FIEMAP_EXTENT_DELALLOC;
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 */
}
return -error;
}
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;
error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS);
if (error)
return error;
/* Set up bmap header for xfs internal routine */
bm.bmv_offset = BTOBB(start);
/* Special case for whole file */
if (length == FIEMAP_MAX_OFFSET)
bm.bmv_length = -1LL;
else
bm.bmv_length = BTOBB(length);
/* our formatter will tell xfs_getbmap when to stop. */
bm.bmv_count = MAXEXTNUM;
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 -error;
return 0;
}
static const struct inode_operations xfs_inode_operations = { static const struct inode_operations xfs_inode_operations = {
.permission = xfs_vn_permission, .permission = xfs_vn_permission,
.truncate = xfs_vn_truncate, .truncate = xfs_vn_truncate,
...@@ -671,6 +754,7 @@ static const struct inode_operations xfs_inode_operations = { ...@@ -671,6 +754,7 @@ static const struct inode_operations xfs_inode_operations = {
.removexattr = generic_removexattr, .removexattr = generic_removexattr,
.listxattr = xfs_vn_listxattr, .listxattr = xfs_vn_listxattr,
.fallocate = xfs_vn_fallocate, .fallocate = xfs_vn_fallocate,
.fiemap = xfs_vn_fiemap,
}; };
static const struct inode_operations xfs_dir_inode_operations = { static const struct inode_operations xfs_dir_inode_operations = {
......
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