From 4c934c7dd60cc60af056b8cc62c39d10ce7ca1c8 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Tue, 28 Mar 2017 14:56:38 -0700 Subject: [PATCH] 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 Eventually this will be superseded by the realtime rmapbt code.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 Reviewed-by: Brian Foster --- fs/xfs/xfs_fsmap.c | 120 ++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 119 insertions(+), 1 deletion(-) diff --git a/fs/xfs/xfs_fsmap.c b/fs/xfs/xfs_fsmap.c index edd75c67919a..48ce356da9e9 100644 --- a/fs/xfs/xfs_fsmap.c +++ b/fs/xfs/xfs_fsmap.c @@ -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);