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xfs: implement the GETFSMAP ioctl

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Introduce a new ioctl that uses the reverse mapping btree to return
information about the physical layout of the filesystem.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2017-03-28 14:56:37 -07:00
parent fb3c3de2f6
commit e89c041338
12 changed files with 1048 additions and 0 deletions
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84
fs/xfs/xfs_ioctl.c
View file

@ -41,6 +41,9 @@
#include "xfs_trans.h"
#include "xfs_pnfs.h"
#include "xfs_acl.h"
#include "xfs_btree.h"
#include <linux/fsmap.h>
#include "xfs_fsmap.h"
#include <linux/capability.h>
#include <linux/cred.h>
@ -1609,6 +1612,84 @@ xfs_ioc_getbmapx(
return 0;
}
struct getfsmap_info {
struct xfs_mount *mp;
struct fsmap __user *data;
__u32 last_flags;
};
STATIC int
xfs_getfsmap_format(struct xfs_fsmap *xfm, void *priv)
{
struct getfsmap_info *info = priv;
struct fsmap fm;
trace_xfs_getfsmap_mapping(info->mp, xfm);
info->last_flags = xfm->fmr_flags;
xfs_fsmap_from_internal(&fm, xfm);
if (copy_to_user(info->data, &fm, sizeof(struct fsmap)))
return -EFAULT;
info->data++;
return 0;
}
STATIC int
xfs_ioc_getfsmap(
struct xfs_inode *ip,
void __user *arg)
{
struct getfsmap_info info = {0};
struct xfs_fsmap_head xhead = {0};
struct fsmap_head head;
bool aborted = false;
int error;
if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
return -EFAULT;
if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
sizeof(head.fmh_keys[0].fmr_reserved)) ||
memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
sizeof(head.fmh_keys[1].fmr_reserved)))
return -EINVAL;
xhead.fmh_iflags = head.fmh_iflags;
xhead.fmh_count = head.fmh_count;
xfs_fsmap_to_internal(&xhead.fmh_keys[0], &head.fmh_keys[0]);
xfs_fsmap_to_internal(&xhead.fmh_keys[1], &head.fmh_keys[1]);
trace_xfs_getfsmap_low_key(ip->i_mount, &xhead.fmh_keys[0]);
trace_xfs_getfsmap_high_key(ip->i_mount, &xhead.fmh_keys[1]);
info.mp = ip->i_mount;
info.data = ((__force struct fsmap_head *)arg)->fmh_recs;
error = xfs_getfsmap(ip->i_mount, &xhead, xfs_getfsmap_format, &info);
if (error == XFS_BTREE_QUERY_RANGE_ABORT) {
error = 0;
aborted = true;
} else if (error)
return error;
/* If we didn't abort, set the "last" flag in the last fmx */
if (!aborted && xhead.fmh_entries) {
info.data--;
info.last_flags |= FMR_OF_LAST;
if (copy_to_user(&info.data->fmr_flags, &info.last_flags,
sizeof(info.last_flags)))
return -EFAULT;
}
/* copy back header */
head.fmh_entries = xhead.fmh_entries;
head.fmh_oflags = xhead.fmh_oflags;
if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
return -EFAULT;
return 0;
}
int
xfs_ioc_swapext(
xfs_swapext_t *sxp)
@ -1789,6 +1870,9 @@ xfs_file_ioctl(
case XFS_IOC_GETBMAPX:
return xfs_ioc_getbmapx(ip, arg);
case FS_IOC_GETFSMAP:
return xfs_ioc_getfsmap(ip, arg);
case XFS_IOC_FD_TO_HANDLE:
case XFS_IOC_PATH_TO_HANDLE:
case XFS_IOC_PATH_TO_FSHANDLE: {