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authorBrian Foster <bfoster@redhat.com>2018-07-11 22:26:29 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2018-07-11 22:26:29 -0700
commitcf612de732cb6ef626019ca085406d183f0a055a (patch)
treef95e717e594fba97786d2233f24753c349b4792d /fs
parent280253d213fb735b565532be2836f94cf574260d (diff)
xfs: remove xfs_btree_cur private firstblock field
The bmbt cursor private structure has a firstblock field that is used to maintain locking order on bmbt allocations. The field holds an actual firstblock value (as opposed to a pointer), so it is initialized on cursor creation, updated on allocation and then the value is transferred back to the source before the cursor is destroyed. This value is always transferred from and back to the ->t_firstblock field. Since xfs_btree_cur already carries a reference to the transaction, we can remove this field from xfs_btree_cur and the associated copying. The bmbt allocations will update the value in the transaction directly. Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/xfs/libxfs/xfs_bmap.c28
-rw-r--r--fs/xfs/libxfs/xfs_bmap_btree.c10
-rw-r--r--fs/xfs/libxfs/xfs_btree.h1
3 files changed, 7 insertions, 32 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 183450f1df19..8a1e6890a64b 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -688,7 +688,6 @@ xfs_bmap_extents_to_btree(
* Need a cursor. Can't allocate until bb_level is filled in.
*/
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
- cur->bc_private.b.firstblock = tp->t_firstblock;
cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
/*
* Convert to a btree with two levels, one record in root.
@@ -732,7 +731,7 @@ xfs_bmap_extents_to_btree(
*/
ASSERT(tp->t_firstblock == NULLFSBLOCK ||
args.agno >= XFS_FSB_TO_AGNO(mp, tp->t_firstblock));
- tp->t_firstblock = cur->bc_private.b.firstblock = args.fsbno;
+ tp->t_firstblock = args.fsbno;
cur->bc_private.b.allocated++;
ip->i_d.di_nblocks++;
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
@@ -925,7 +924,6 @@ xfs_bmap_add_attrfork_btree(
*flags |= XFS_ILOG_DBROOT;
else {
cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
- cur->bc_private.b.firstblock = tp->t_firstblock;
error = xfs_bmbt_lookup_first(cur, &stat);
if (error)
goto error0;
@@ -937,7 +935,6 @@ xfs_bmap_add_attrfork_btree(
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
return -ENOSPC;
}
- tp->t_firstblock = cur->bc_private.b.firstblock;
cur->bc_private.b.allocated = 0;
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
}
@@ -4058,14 +4055,10 @@ xfs_bmapi_allocate(
if (error)
return error;
- if (bma->cur)
- bma->cur->bc_private.b.firstblock = bma->tp->t_firstblock;
if (bma->blkno == NULLFSBLOCK)
return 0;
- if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
+ if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur)
bma->cur = xfs_bmbt_init_cursor(mp, bma->tp, bma->ip, whichfork);
- bma->cur->bc_private.b.firstblock = bma->tp->t_firstblock;
- }
/*
* Bump the number of extents we've allocated
* in this call.
@@ -4151,7 +4144,6 @@ xfs_bmapi_convert_unwritten(
if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) {
bma->cur = xfs_bmbt_init_cursor(bma->ip->i_mount, bma->tp,
bma->ip, whichfork);
- bma->cur->bc_private.b.firstblock = bma->tp->t_firstblock;
}
mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN)
? XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
@@ -4458,13 +4450,6 @@ error0:
xfs_trans_log_inode(tp, ip, bma.logflags);
if (bma.cur) {
- if (!error) {
- ASSERT(tp->t_firstblock == NULLFSBLOCK ||
- XFS_FSB_TO_AGNO(mp, tp->t_firstblock) <=
- XFS_FSB_TO_AGNO(mp,
- bma.cur->bc_private.b.firstblock));
- tp->t_firstblock = bma.cur->bc_private.b.firstblock;
- }
xfs_btree_del_cursor(bma.cur,
error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
}
@@ -4528,7 +4513,6 @@ xfs_bmapi_remap(
if (ifp->if_flags & XFS_IFBROOT) {
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
- cur->bc_private.b.firstblock = tp->t_firstblock;
cur->bc_private.b.flags = 0;
}
@@ -5189,7 +5173,6 @@ __xfs_bunmapi(
if (ifp->if_flags & XFS_IFBROOT) {
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
- cur->bc_private.b.firstblock = tp->t_firstblock;
cur->bc_private.b.flags = 0;
} else
cur = NULL;
@@ -5457,10 +5440,8 @@ error0:
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
if (cur) {
- if (!error) {
- tp->t_firstblock = cur->bc_private.b.firstblock;
+ if (!error)
cur->bc_private.b.allocated = 0;
- }
xfs_btree_del_cursor(cur,
error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
}
@@ -5676,7 +5657,6 @@ xfs_bmap_collapse_extents(
if (ifp->if_flags & XFS_IFBROOT) {
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
- cur->bc_private.b.firstblock = tp->t_firstblock;
cur->bc_private.b.flags = 0;
}
@@ -5796,7 +5776,6 @@ xfs_bmap_insert_extents(
if (ifp->if_flags & XFS_IFBROOT) {
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
- cur->bc_private.b.firstblock = tp->t_firstblock;
cur->bc_private.b.flags = 0;
}
@@ -5918,7 +5897,6 @@ xfs_bmap_split_extent_at(
if (ifp->if_flags & XFS_IFBROOT) {
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
- cur->bc_private.b.firstblock = tp->t_firstblock;
cur->bc_private.b.flags = 0;
error = xfs_bmbt_lookup_eq(cur, &got, &i);
if (error)
diff --git a/fs/xfs/libxfs/xfs_bmap_btree.c b/fs/xfs/libxfs/xfs_bmap_btree.c
index e8b01af09db5..8a9b98b11e34 100644
--- a/fs/xfs/libxfs/xfs_bmap_btree.c
+++ b/fs/xfs/libxfs/xfs_bmap_btree.c
@@ -175,7 +175,6 @@ xfs_bmbt_dup_cursor(
* Copy the firstblock, dfops, and flags values,
* since init cursor doesn't get them.
*/
- new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
new->bc_private.b.flags = cur->bc_private.b.flags;
return new;
@@ -186,11 +185,11 @@ xfs_bmbt_update_cursor(
struct xfs_btree_cur *src,
struct xfs_btree_cur *dst)
{
- ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
+ ASSERT((dst->bc_tp->t_firstblock != NULLFSBLOCK) ||
(dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
dst->bc_private.b.allocated += src->bc_private.b.allocated;
- dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
+ dst->bc_tp->t_firstblock = src->bc_tp->t_firstblock;
src->bc_private.b.allocated = 0;
}
@@ -208,7 +207,7 @@ xfs_bmbt_alloc_block(
memset(&args, 0, sizeof(args));
args.tp = cur->bc_tp;
args.mp = cur->bc_mp;
- args.fsbno = cur->bc_private.b.firstblock;
+ args.fsbno = cur->bc_tp->t_firstblock;
args.firstblock = args.fsbno;
xfs_rmap_ino_bmbt_owner(&args.oinfo, cur->bc_private.b.ip->i_ino,
cur->bc_private.b.whichfork);
@@ -263,7 +262,7 @@ xfs_bmbt_alloc_block(
}
ASSERT(args.len == 1);
- cur->bc_private.b.firstblock = args.fsbno;
+ cur->bc_tp->t_firstblock = args.fsbno;
cur->bc_private.b.allocated++;
cur->bc_private.b.ip->i_d.di_nblocks++;
xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
@@ -562,7 +561,6 @@ xfs_bmbt_init_cursor(
cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
cur->bc_private.b.ip = ip;
- cur->bc_private.b.firstblock = NULLFSBLOCK;
cur->bc_private.b.allocated = 0;
cur->bc_private.b.flags = 0;
cur->bc_private.b.whichfork = whichfork;
diff --git a/fs/xfs/libxfs/xfs_btree.h b/fs/xfs/libxfs/xfs_btree.h
index b986a8fc8d40..503615f4d729 100644
--- a/fs/xfs/libxfs/xfs_btree.h
+++ b/fs/xfs/libxfs/xfs_btree.h
@@ -214,7 +214,6 @@ typedef struct xfs_btree_cur
} a;
struct { /* needed for BMAP */
struct xfs_inode *ip; /* pointer to our inode */
- xfs_fsblock_t firstblock; /* 1st blk allocated */
int allocated; /* count of alloced */
short forksize; /* fork's inode space */
char whichfork; /* data or attr fork */