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xfs: report realtime space information via the rtbitmap 

Use the realtime bitmap to return free space information via getfsmap.
Eventually this will be superseded by the realtime rmapbt code.

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 14:56:38 -07:00
parent a1cae7283d
commit 4c934c7dd6
1 changed files with 119 additions and 1 deletions
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120
fs/xfs/xfs_fsmap.c
View File

@ -41,6 +41,7 @@
#include "xfs_refcount.h"
#include "xfs_refcount_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_rtalloc.h"
/* Convert an xfs_fsmap to an fsmap. */
void
@ -366,6 +367,29 @@ xfs_getfsmap_datadev_helper(
return xfs_getfsmap_helper(cur->bc_tp, info, rec, rec_daddr);
}
/* Transform a rtbitmap "record" into a fsmap */
STATIC int
xfs_getfsmap_rtdev_rtbitmap_helper(
struct xfs_trans *tp,
struct xfs_rtalloc_rec *rec,
void *priv)
{
struct xfs_mount *mp = tp->t_mountp;
struct xfs_getfsmap_info *info = priv;
struct xfs_rmap_irec irec;
xfs_daddr_t rec_daddr;
rec_daddr = XFS_FSB_TO_BB(mp, rec->ar_startblock);
irec.rm_startblock = rec->ar_startblock;
irec.rm_blockcount = rec->ar_blockcount;
irec.rm_owner = XFS_RMAP_OWN_NULL; /* "free" */
irec.rm_offset = 0;
irec.rm_flags = 0;
return xfs_getfsmap_helper(tp, info, &irec, rec_daddr);
}
/* Transform a bnobt irec into a fsmap */
STATIC int
xfs_getfsmap_datadev_bnobt_helper(
@ -451,6 +475,93 @@ xfs_getfsmap_logdev(
return xfs_getfsmap_helper(tp, info, &rmap, 0);
}
/* Execute a getfsmap query against the realtime device. */
STATIC int
__xfs_getfsmap_rtdev(
struct xfs_trans *tp,
struct xfs_fsmap *keys,
int (*query_fn)(struct xfs_trans *,
struct xfs_getfsmap_info *),
struct xfs_getfsmap_info *info)
{
struct xfs_mount *mp = tp->t_mountp;
xfs_fsblock_t start_fsb;
xfs_fsblock_t end_fsb;
xfs_daddr_t eofs;
int error = 0;
eofs = XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
if (keys[0].fmr_physical >= eofs)
return 0;
if (keys[1].fmr_physical >= eofs)
keys[1].fmr_physical = eofs - 1;
start_fsb = XFS_BB_TO_FSBT(mp, keys[0].fmr_physical);
end_fsb = XFS_BB_TO_FSB(mp, keys[1].fmr_physical);
/* Set up search keys */
info->low.rm_startblock = start_fsb;
error = xfs_fsmap_owner_to_rmap(&info->low, &keys[0]);
if (error)
return error;
info->low.rm_offset = XFS_BB_TO_FSBT(mp, keys[0].fmr_offset);
info->low.rm_blockcount = 0;
xfs_getfsmap_set_irec_flags(&info->low, &keys[0]);
info->high.rm_startblock = end_fsb;
error = xfs_fsmap_owner_to_rmap(&info->high, &keys[1]);
if (error)
return error;
info->high.rm_offset = XFS_BB_TO_FSBT(mp, keys[1].fmr_offset);
info->high.rm_blockcount = 0;
xfs_getfsmap_set_irec_flags(&info->high, &keys[1]);
trace_xfs_fsmap_low_key(mp, info->dev, info->agno, &info->low);
trace_xfs_fsmap_high_key(mp, info->dev, info->agno, &info->high);
return query_fn(tp, info);
}
/* Actually query the realtime bitmap. */
STATIC int
xfs_getfsmap_rtdev_rtbitmap_query(
struct xfs_trans *tp,
struct xfs_getfsmap_info *info)
{
struct xfs_rtalloc_rec alow;
struct xfs_rtalloc_rec ahigh;
int error;
xfs_ilock(tp->t_mountp->m_rbmip, XFS_ILOCK_SHARED);
alow.ar_startblock = info->low.rm_startblock;
ahigh.ar_startblock = info->high.rm_startblock;
error = xfs_rtalloc_query_range(tp, &alow, &ahigh,
xfs_getfsmap_rtdev_rtbitmap_helper, info);
if (error)
goto err;
/* Report any gaps at the end of the rtbitmap */
info->last = true;
error = xfs_getfsmap_rtdev_rtbitmap_helper(tp, &ahigh, info);
if (error)
goto err;
err:
xfs_iunlock(tp->t_mountp->m_rbmip, XFS_ILOCK_SHARED);
return error;
}
/* Execute a getfsmap query against the realtime device rtbitmap. */
STATIC int
xfs_getfsmap_rtdev_rtbitmap(
struct xfs_trans *tp,
struct xfs_fsmap *keys,
struct xfs_getfsmap_info *info)
{
info->missing_owner = XFS_FMR_OWN_UNKNOWN;
return __xfs_getfsmap_rtdev(tp, keys, xfs_getfsmap_rtdev_rtbitmap_query,
info);
}
/* Execute a getfsmap query against the regular data device. */
STATIC int
__xfs_getfsmap_datadev(
@ -649,6 +760,9 @@ xfs_getfsmap_is_valid_device(
if (mp->m_logdev_targp &&
fm->fmr_device == new_encode_dev(mp->m_logdev_targp->bt_dev))
return true;
if (mp->m_rtdev_targp &&
fm->fmr_device == new_encode_dev(mp->m_rtdev_targp->bt_dev))
return true;
return false;
}
@ -681,7 +795,7 @@ xfs_getfsmap_check_keys(
return false;
}
#define XFS_GETFSMAP_DEVS 2
#define XFS_GETFSMAP_DEVS 3
/*
* Get filesystem's extents as described in head, and format for
* output. Calls formatter to fill the user's buffer until all
@ -736,6 +850,10 @@ xfs_getfsmap(
handlers[1].dev = new_encode_dev(mp->m_logdev_targp->bt_dev);
handlers[1].fn = xfs_getfsmap_logdev;
}
if (mp->m_rtdev_targp) {
handlers[2].dev = new_encode_dev(mp->m_rtdev_targp->bt_dev);
handlers[2].fn = xfs_getfsmap_rtdev_rtbitmap;
}
xfs_sort(handlers, XFS_GETFSMAP_DEVS, sizeof(struct xfs_getfsmap_dev),
xfs_getfsmap_dev_compare);