From af8383779b87bff9118a95274addd6d7304111f2 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Tue, 17 Oct 2017 14:16:24 -0700
Subject: [PATCH 21/77] xfs: refactor xfs_bmap_add_extent_delay_real
Git-commit: 4dcb8869871cc102b9431ae78b40bfc39087b90c
Patch-mainline: v4.15-rc1
References: bsc#1095344
Use xfs_iext_get_extent to find, and xfs_iext_update_extent to update
entries in the in-core extent list. This isolates the function from
the detailed layout of the extent list, and generally makes the code
a lot more readable.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Acked-by: Nikolay Borisov <nborisov@suse.com>
---
fs/xfs/libxfs/xfs_bmap.c | 181 +++++++++++++++++++++++++----------------------
1 file changed, 95 insertions(+), 86 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 0572a4d8f35c..d2c17fdad686 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -1592,7 +1592,6 @@ xfs_bmap_add_extent_delay_real(
{
struct xfs_bmbt_irec *new = &bma->got;
int diff; /* temp value */
- xfs_bmbt_rec_host_t *ep; /* extent entry for idx */
int error; /* error return value */
int i; /* temp state */
xfs_ifork_t *ifp; /* inode fork pointer */
@@ -1604,10 +1603,10 @@ xfs_bmap_add_extent_delay_real(
xfs_filblks_t da_new; /* new count del alloc blocks used */
xfs_filblks_t da_old; /* old count del alloc blocks used */
xfs_filblks_t temp=0; /* value for da_new calculations */
- xfs_filblks_t temp2=0;/* value for da_new calculations */
int tmp_rval; /* partial logging flags */
struct xfs_mount *mp;
xfs_extnum_t *nextents;
+ struct xfs_bmbt_irec old;
mp = bma->ip->i_mount;
ifp = XFS_IFORK_PTR(bma->ip, whichfork);
@@ -1633,9 +1632,9 @@ xfs_bmap_add_extent_delay_real(
/*
* Set up a bunch of variables to make the tests simpler.
*/
- ep = xfs_iext_get_ext(ifp, bma->idx);
- xfs_bmbt_get_all(ep, &PREV);
+ xfs_iext_get_extent(ifp, bma->idx, &PREV);
new_endoff = new->br_startoff + new->br_blockcount;
+ ASSERT(isnullstartblock(PREV.br_startblock));
ASSERT(PREV.br_startoff <= new->br_startoff);
ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
@@ -1710,9 +1709,8 @@ xfs_bmap_add_extent_delay_real(
*/
bma->idx--;
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
- xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
- LEFT.br_blockcount + PREV.br_blockcount +
- RIGHT.br_blockcount);
+ LEFT.br_blockcount += PREV.br_blockcount + RIGHT.br_blockcount;
+ xfs_iext_update_extent(ifp, bma->idx, &LEFT);
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_iext_remove(bma->ip, bma->idx + 1, 2, state);
@@ -1737,9 +1735,7 @@ xfs_bmap_add_extent_delay_real(
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
LEFT.br_startblock,
- LEFT.br_blockcount +
- PREV.br_blockcount +
- RIGHT.br_blockcount, LEFT.br_state);
+ LEFT.br_blockcount, LEFT.br_state);
if (error)
goto done;
}
@@ -1752,9 +1748,10 @@ xfs_bmap_add_extent_delay_real(
*/
bma->idx--;
+ old = LEFT;
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
- xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx),
- LEFT.br_blockcount + PREV.br_blockcount);
+ LEFT.br_blockcount += PREV.br_blockcount;
+ xfs_iext_update_extent(ifp, bma->idx, &LEFT);
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
@@ -1762,16 +1759,15 @@ xfs_bmap_add_extent_delay_real(
rval = XFS_ILOG_DEXT;
else {
rval = 0;
- error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
- LEFT.br_startblock, LEFT.br_blockcount,
+ error = xfs_bmbt_lookup_eq(bma->cur, old.br_startoff,
+ old.br_startblock, old.br_blockcount,
&i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
LEFT.br_startblock,
- LEFT.br_blockcount +
- PREV.br_blockcount, LEFT.br_state);
+ LEFT.br_blockcount, LEFT.br_state);
if (error)
goto done;
}
@@ -1783,9 +1779,9 @@ xfs_bmap_add_extent_delay_real(
* The right neighbor is contiguous, the left is not.
*/
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
- xfs_bmbt_set_startblock(ep, new->br_startblock);
- xfs_bmbt_set_blockcount(ep,
- PREV.br_blockcount + RIGHT.br_blockcount);
+ PREV.br_startblock = new->br_startblock;
+ PREV.br_blockcount += RIGHT.br_blockcount;
+ xfs_iext_update_extent(ifp, bma->idx, &PREV);
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
xfs_iext_remove(bma->ip, bma->idx + 1, 1, state);
@@ -1800,9 +1796,8 @@ xfs_bmap_add_extent_delay_real(
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(bma->cur, PREV.br_startoff,
- new->br_startblock,
- PREV.br_blockcount +
- RIGHT.br_blockcount, PREV.br_state);
+ PREV.br_startblock,
+ PREV.br_blockcount, PREV.br_state);
if (error)
goto done;
}
@@ -1815,8 +1810,9 @@ xfs_bmap_add_extent_delay_real(
* the new one.
*/
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
- xfs_bmbt_set_startblock(ep, new->br_startblock);
- xfs_bmbt_set_state(ep, new->br_state);
+ PREV.br_startblock = new->br_startblock;
+ PREV.br_state = new->br_state;
+ xfs_iext_update_extent(ifp, bma->idx, &PREV);
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
(*nextents)++;
@@ -1843,38 +1839,39 @@ xfs_bmap_add_extent_delay_real(
* Filling in the first part of a previous delayed allocation.
* The left neighbor is contiguous.
*/
+ old = LEFT;
+ temp = PREV.br_blockcount - new->br_blockcount;
+ da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
+ startblockval(PREV.br_startblock));
+
trace_xfs_bmap_pre_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
- xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx - 1),
- LEFT.br_blockcount + new->br_blockcount);
- xfs_bmbt_set_startoff(ep,
- PREV.br_startoff + new->br_blockcount);
+ LEFT.br_blockcount += new->br_blockcount;
+ xfs_iext_update_extent(ifp, bma->idx - 1, &LEFT);
trace_xfs_bmap_post_update(bma->ip, bma->idx - 1, state, _THIS_IP_);
- temp = PREV.br_blockcount - new->br_blockcount;
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
- xfs_bmbt_set_blockcount(ep, temp);
+ PREV.br_blockcount = temp = PREV.br_blockcount - new->br_blockcount;
+ PREV.br_startoff += new->br_blockcount;
+ PREV.br_startblock = nullstartblock(da_new);
+ xfs_iext_update_extent(ifp, bma->idx, &PREV);
+ trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
+
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
- error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff,
- LEFT.br_startblock, LEFT.br_blockcount,
+ error = xfs_bmbt_lookup_eq(bma->cur, old.br_startoff,
+ old.br_startblock, old.br_blockcount,
&i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
error = xfs_bmbt_update(bma->cur, LEFT.br_startoff,
- LEFT.br_startblock,
- LEFT.br_blockcount +
- new->br_blockcount,
+ LEFT.br_startblock, LEFT.br_blockcount,
LEFT.br_state);
if (error)
goto done;
}
- da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
- startblockval(PREV.br_startblock));
- xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
- trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
bma->idx--;
break;
@@ -1884,10 +1881,6 @@ xfs_bmap_add_extent_delay_real(
* Filling in the first part of a previous delayed allocation.
* The left neighbor is not contiguous.
*/
- trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
- xfs_bmbt_set_startoff(ep, new_endoff);
- temp = PREV.br_blockcount - new->br_blockcount;
- xfs_bmbt_set_blockcount(ep, temp);
xfs_iext_insert(bma->ip, bma->idx, 1, new, state);
(*nextents)++;
if (bma->cur == NULL)
@@ -1915,12 +1908,19 @@ xfs_bmap_add_extent_delay_real(
if (error)
goto done;
}
+
+ temp = PREV.br_blockcount - new->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock) -
(bma->cur ? bma->cur->bc_private.b.allocated : 0));
- ep = xfs_iext_get_ext(ifp, bma->idx + 1);
- xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
+
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
+ PREV.br_startoff = new_endoff;
+ PREV.br_blockcount = temp;
+ PREV.br_startblock = nullstartblock(da_new);
+ xfs_iext_update_extent(ifp, bma->idx + 1, &PREV);
trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
+
break;
case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
@@ -1928,37 +1928,39 @@ xfs_bmap_add_extent_delay_real(
* Filling in the last part of a previous delayed allocation.
* The right neighbor is contiguous with the new allocation.
*/
- temp = PREV.br_blockcount - new->br_blockcount;
+ old = RIGHT;
trace_xfs_bmap_pre_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
- xfs_bmbt_set_blockcount(ep, temp);
- xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx + 1),
- new->br_startoff, new->br_startblock,
- new->br_blockcount + RIGHT.br_blockcount,
- RIGHT.br_state);
+ RIGHT.br_startoff = new->br_startoff;
+ RIGHT.br_startblock = new->br_startblock;
+ RIGHT.br_blockcount += new->br_blockcount;
+ xfs_iext_update_extent(ifp, bma->idx + 1, &RIGHT);
trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_);
+
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
- error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff,
- RIGHT.br_startblock,
- RIGHT.br_blockcount, &i);
+ error = xfs_bmbt_lookup_eq(bma->cur, old.br_startoff,
+ old.br_startblock,
+ old.br_blockcount, &i);
if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
- error = xfs_bmbt_update(bma->cur, new->br_startoff,
- new->br_startblock,
- new->br_blockcount +
- RIGHT.br_blockcount,
+ error = xfs_bmbt_update(bma->cur, RIGHT.br_startoff,
+ RIGHT.br_startblock, RIGHT.br_blockcount,
RIGHT.br_state);
if (error)
goto done;
}
+ temp = PREV.br_blockcount - new->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock));
+
trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
- xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
+ PREV.br_blockcount = temp;
+ PREV.br_startblock = nullstartblock(da_new);
+ xfs_iext_update_extent(ifp, bma->idx, &PREV);
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
bma->idx++;
@@ -1969,9 +1971,6 @@ xfs_bmap_add_extent_delay_real(
* Filling in the last part of a previous delayed allocation.
* The right neighbor is not contiguous.
*/
- temp = PREV.br_blockcount - new->br_blockcount;
- trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
- xfs_bmbt_set_blockcount(ep, temp);
xfs_iext_insert(bma->ip, bma->idx + 1, 1, new, state);
(*nextents)++;
if (bma->cur == NULL)
@@ -1999,11 +1998,16 @@ xfs_bmap_add_extent_delay_real(
if (error)
goto done;
}
+
+ temp = PREV.br_blockcount - new->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock) -
(bma->cur ? bma->cur->bc_private.b.allocated : 0));
- ep = xfs_iext_get_ext(ifp, bma->idx);
- xfs_bmbt_set_startblock(ep, nullstartblock(da_new));
+
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_);
+ PREV.br_startblock = nullstartblock(da_new);
+ PREV.br_blockcount = temp;
+ xfs_iext_update_extent(ifp, bma->idx, &PREV);
trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
bma->idx++;
@@ -2030,19 +2034,33 @@ xfs_bmap_add_extent_delay_real(
* PREV @ idx LEFT RIGHT
* inserted at idx + 1
*/
- temp = new->br_startoff - PREV.br_startoff;
- temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
- trace_xfs_bmap_pre_update(bma->ip, bma->idx, 0, _THIS_IP_);
- xfs_bmbt_set_blockcount(ep, temp); /* truncate PREV */
+ old = PREV;
+
+ /* LEFT is the new middle */
LEFT = *new;
+
+ /* RIGHT is the new right */
RIGHT.br_state = PREV.br_state;
- RIGHT.br_startblock = nullstartblock(
- (int)xfs_bmap_worst_indlen(bma->ip, temp2));
RIGHT.br_startoff = new_endoff;
- RIGHT.br_blockcount = temp2;
+ RIGHT.br_blockcount =
+ PREV.br_startoff + PREV.br_blockcount - new_endoff;
+ RIGHT.br_startblock =
+ nullstartblock(xfs_bmap_worst_indlen(bma->ip,
+ RIGHT.br_blockcount));
+
+ /* truncate PREV */
+ trace_xfs_bmap_pre_update(bma->ip, bma->idx, 0, _THIS_IP_);
+ PREV.br_blockcount = new->br_startoff - PREV.br_startoff;
+ PREV.br_startblock =
+ nullstartblock(xfs_bmap_worst_indlen(bma->ip,
+ PREV.br_blockcount));
+ xfs_iext_update_extent(ifp, bma->idx, &PREV);
+ trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
+
/* insert LEFT (r[0]) and RIGHT (r[1]) at the same time */
xfs_iext_insert(bma->ip, bma->idx + 1, 2, &LEFT, state);
(*nextents)++;
+
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
@@ -2068,12 +2086,12 @@ xfs_bmap_add_extent_delay_real(
if (error)
goto done;
}
- temp = xfs_bmap_worst_indlen(bma->ip, temp);
- temp2 = xfs_bmap_worst_indlen(bma->ip, temp2);
- diff = (int)(temp + temp2 -
- (startblockval(PREV.br_startblock) -
- (bma->cur ?
- bma->cur->bc_private.b.allocated : 0)));
+
+ da_new = startblockval(PREV.br_startblock) +
+ startblockval(RIGHT.br_startblock);
+ diff = da_new - startblockval(old.br_startblock);
+ if (bma->cur)
+ diff += bma->cur->bc_private.b.allocated;
if (diff > 0) {
error = xfs_mod_fdblocks(bma->ip->i_mount,
-((int64_t)diff), false);
@@ -2082,16 +2100,7 @@ xfs_bmap_add_extent_delay_real(
goto done;
}
- ep = xfs_iext_get_ext(ifp, bma->idx);
- xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
- trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_);
- trace_xfs_bmap_pre_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
- xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, bma->idx + 2),
- nullstartblock((int)temp2));
- trace_xfs_bmap_post_update(bma->ip, bma->idx + 2, state, _THIS_IP_);
-
bma->idx++;
- da_new = temp + temp2;
break;
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
--
2.7.4