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xfs: add a new ioctl to describe allocation group geometry

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Add a new ioctl to describe an allocation group's geometry.

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
2019-04-12 07:41:17 -07:00
parent 1b6d968de2
commit 7cd5006bdb
5 changed files with 93 additions and 0 deletions
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52
fs/xfs/libxfs/xfs_ag.c
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@@ -19,6 +19,7 @@
#include "xfs_ialloc.h"
#include "xfs_rmap.h"
#include "xfs_ag.h"
#include "xfs_ag_resv.h"
static struct xfs_buf *
xfs_get_aghdr_buf(
@@ -461,3 +462,54 @@ xfs_ag_extend_space(
len, &XFS_RMAP_OINFO_SKIP_UPDATE,
XFS_AG_RESV_NONE);
}
/* Retrieve AG geometry. */
int
xfs_ag_get_geometry(
struct xfs_mount *mp,
xfs_agnumber_t agno,
struct xfs_ag_geometry *ageo)
{
struct xfs_buf *agi_bp;
struct xfs_buf *agf_bp;
struct xfs_agi *agi;
struct xfs_agf *agf;
struct xfs_perag *pag;
unsigned int freeblks;
int error;
if (agno >= mp->m_sb.sb_agcount)
return -EINVAL;
/* Lock the AG headers. */
error = xfs_ialloc_read_agi(mp, NULL, agno, &agi_bp);
if (error)
return error;
error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agf_bp);
if (error)
goto out_agi;
pag = xfs_perag_get(mp, agno);
/* Fill out form. */
memset(ageo, 0, sizeof(*ageo));
ageo->ag_number = agno;
agi = XFS_BUF_TO_AGI(agi_bp);
ageo->ag_icount = be32_to_cpu(agi->agi_count);
ageo->ag_ifree = be32_to_cpu(agi->agi_freecount);
agf = XFS_BUF_TO_AGF(agf_bp);
ageo->ag_length = be32_to_cpu(agf->agf_length);
freeblks = pag->pagf_freeblks +
pag->pagf_flcount +
pag->pagf_btreeblks -
xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE);
ageo->ag_freeblks = freeblks;
/* Release resources. */
xfs_perag_put(pag);
xfs_buf_relse(agf_bp);
out_agi:
xfs_buf_relse(agi_bp);
return error;
}