[PATCH 12/17] xfs: refactor xfs_bmap_add_extent_unwritten_real

Christoph Hellwig
2017-09-03T07:30:36Z

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.

Also get rid of the oldext and newext variables as using the extent
records is a lot more descriptive.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/xfs/libxfs/xfs_bmap.c | 208 +++++++++++++++++++++++------------------------
1 file changed, 104 insertions(+), 104 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index edea670a3f74..bc41fc18cceb 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -2171,18 +2171,16 @@ xfs_bmap_add_extent_unwritten_real(
int *logflagsp) /* inode logging flags */
{
xfs_btree_cur_t *cur; /* btree cursor */
- 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 */
xfs_fileoff_t new_endoff; /* end offset of new entry */
- xfs_exntst_t newext; /* new extent state */
- xfs_exntst_t oldext; /* old extent state */
xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
/* left is 0, right is 1, prev is 2 */
int rval=0; /* return value (logging flags) */
int state = 0;/* state bits, accessed thru macros */
struct xfs_mount *mp = ip->i_mount;
+ struct xfs_bmbt_irec old;

*logflagsp = 0;

@@ -2205,12 +2203,8 @@ xfs_bmap_add_extent_unwritten_real(
* Set up a bunch of variables to make the tests simpler.
*/
error = 0;
- ep = xfs_iext_get_ext(ifp, *idx);
- xfs_bmbt_get_all(ep, &PREV);
- newext = new->br_state;
- oldext = (newext == XFS_EXT_UNWRITTEN) ?
- XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
- ASSERT(PREV.br_state == oldext);
+ xfs_iext_get_extent(ifp, *idx, &PREV);
+ ASSERT(new->br_state != PREV.br_state);
new_endoff = new->br_startoff + new->br_blockcount;
ASSERT(PREV.br_startoff <= new->br_startoff);
ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
@@ -2239,7 +2233,7 @@ xfs_bmap_add_extent_unwritten_real(
if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
- LEFT.br_state == newext &&
+ LEFT.br_state == new->br_state &&
LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
state |= BMAP_LEFT_CONTIG;

@@ -2258,7 +2252,7 @@ xfs_bmap_add_extent_unwritten_real(
if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
new_endoff == RIGHT.br_startoff &&
new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
- newext == RIGHT.br_state &&
+ new->br_state == RIGHT.br_state &&
new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING)) !=
@@ -2282,9 +2276,8 @@ xfs_bmap_add_extent_unwritten_real(
--*idx;

trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
- xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
- LEFT.br_blockcount + PREV.br_blockcount +
- RIGHT.br_blockcount);
+ LEFT.br_blockcount += PREV.br_blockcount + RIGHT.br_blockcount;
+ xfs_iext_update_extent(ifp, *idx, &LEFT);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);

xfs_iext_remove(ip, *idx + 1, 2, state);
@@ -2311,10 +2304,10 @@ xfs_bmap_add_extent_unwritten_real(
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
- if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
- LEFT.br_startblock,
- LEFT.br_blockcount + PREV.br_blockcount +
- RIGHT.br_blockcount, LEFT.br_state)))
+ error = xfs_bmbt_update(cur, LEFT.br_startoff,
+ LEFT.br_startblock, LEFT.br_blockcount,
+ LEFT.br_state);
+ if (error)
goto done;
}
break;
@@ -2327,8 +2320,8 @@ xfs_bmap_add_extent_unwritten_real(
--*idx;

trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
- xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx),
- LEFT.br_blockcount + PREV.br_blockcount);
+ LEFT.br_blockcount += PREV.br_blockcount;
+ xfs_iext_update_extent(ifp, *idx, &LEFT);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);

xfs_iext_remove(ip, *idx + 1, 1, state);
@@ -2349,10 +2342,10 @@ xfs_bmap_add_extent_unwritten_real(
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
- if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
- LEFT.br_startblock,
- LEFT.br_blockcount + PREV.br_blockcount,
- LEFT.br_state)))
+ error = xfs_bmbt_update(cur, LEFT.br_startoff,
+ LEFT.br_startblock, LEFT.br_blockcount,
+ LEFT.br_state);
+ if (error)
goto done;
}
break;
@@ -2363,10 +2356,11 @@ xfs_bmap_add_extent_unwritten_real(
* The right neighbor is contiguous, the left is not.
*/
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
- xfs_bmbt_set_blockcount(ep,
- PREV.br_blockcount + RIGHT.br_blockcount);
- xfs_bmbt_set_state(ep, newext);
+ PREV.br_blockcount += RIGHT.br_blockcount;
+ PREV.br_state = new->br_state;
+ xfs_iext_update_extent(ifp, *idx, &PREV);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
+
xfs_iext_remove(ip, *idx + 1, 1, state);
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
@@ -2385,10 +2379,10 @@ xfs_bmap_add_extent_unwritten_real(
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
- if ((error = xfs_bmbt_update(cur, new->br_startoff,
- new->br_startblock,
- new->br_blockcount + RIGHT.br_blockcount,
- newext)))
+ error = xfs_bmbt_update(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ PREV.br_state);
+ if (error)
goto done;
}
break;
@@ -2400,7 +2394,8 @@ xfs_bmap_add_extent_unwritten_real(
* the new one.
*/
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
- xfs_bmbt_set_state(ep, newext);
+ PREV.br_state = new->br_state;
+ xfs_iext_update_extent(ifp, *idx, &PREV);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);

if (cur == NULL)
@@ -2412,9 +2407,10 @@ xfs_bmap_add_extent_unwritten_real(
&i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
- if ((error = xfs_bmbt_update(cur, new->br_startoff,
- new->br_startblock, new->br_blockcount,
- newext)))
+ error = xfs_bmbt_update(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ PREV.br_state);
+ if (error)
goto done;
}
break;
@@ -2425,17 +2421,16 @@ xfs_bmap_add_extent_unwritten_real(
* The left neighbor is contiguous.
*/
trace_xfs_bmap_pre_update(ip, *idx - 1, state, _THIS_IP_);
- xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *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, *idx - 1, &LEFT);
trace_xfs_bmap_post_update(ip, *idx - 1, state, _THIS_IP_);

+ old = PREV;
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
- xfs_bmbt_set_startblock(ep,
- new->br_startblock + new->br_blockcount);
- xfs_bmbt_set_blockcount(ep,
- PREV.br_blockcount - new->br_blockcount);
+ PREV.br_startoff += new->br_blockcount;
+ PREV.br_startblock += new->br_blockcount;
+ PREV.br_blockcount -= new->br_blockcount;
+ xfs_iext_update_extent(ifp, *idx, &PREV);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);

--*idx;
@@ -2444,23 +2439,23 @@ xfs_bmap_add_extent_unwritten_real(
rval = XFS_ILOG_DEXT;
else {
rval = 0;
- if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
- PREV.br_startblock, PREV.br_blockcount,
- &i)))
+ error = xfs_bmbt_lookup_eq(cur, old.br_startoff,
+ old.br_startblock, old.br_blockcount,
+ &i);
+ if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
- if ((error = xfs_bmbt_update(cur,
- PREV.br_startoff + new->br_blockcount,
- PREV.br_startblock + new->br_blockcount,
- PREV.br_blockcount - new->br_blockcount,
- oldext)))
+ error = xfs_bmbt_update(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ PREV.br_state);
+ if (error)
goto done;
- if ((error = xfs_btree_decrement(cur, 0, &i)))
+ error = xfs_btree_decrement(cur, 0, &i);
+ if (error)
goto done;
error = xfs_bmbt_update(cur, LEFT.br_startoff,
- LEFT.br_startblock,
- LEFT.br_blockcount + new->br_blockcount,
- LEFT.br_state);
+ LEFT.br_startblock, LEFT.br_blockcount,
+ LEFT.br_state);
if (error)
goto done;
}
@@ -2471,13 +2466,12 @@ xfs_bmap_add_extent_unwritten_real(
* Setting the first part of a previous oldext extent to newext.
* The left neighbor is not contiguous.
*/
+ old = PREV;
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
- ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
- xfs_bmbt_set_startoff(ep, new_endoff);
- xfs_bmbt_set_blockcount(ep,
- PREV.br_blockcount - new->br_blockcount);
- xfs_bmbt_set_startblock(ep,
- new->br_startblock + new->br_blockcount);
+ PREV.br_startoff += new->br_blockcount;
+ PREV.br_startblock += new->br_blockcount;
+ PREV.br_blockcount -= new->br_blockcount;
+ xfs_iext_update_extent(ifp, *idx, &PREV);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);

xfs_iext_insert(ip, *idx, 1, new, state);
@@ -2487,16 +2481,16 @@ xfs_bmap_add_extent_unwritten_real(
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
- if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
- PREV.br_startblock, PREV.br_blockcount,
- &i)))
+ error = xfs_bmbt_lookup_eq(cur, old.br_startoff,
+ old.br_startblock, old.br_blockcount,
+ &i);
+ if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
- if ((error = xfs_bmbt_update(cur,
- PREV.br_startoff + new->br_blockcount,
- PREV.br_startblock + new->br_blockcount,
- PREV.br_blockcount - new->br_blockcount,
- oldext)))
+ error = xfs_bmbt_update(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ PREV.br_state);
+ if (error)
goto done;
cur->bc_rec.b = *new;
if ((error = xfs_btree_insert(cur, &i)))
@@ -2510,39 +2504,43 @@ xfs_bmap_add_extent_unwritten_real(
* Setting the last part of a previous oldext extent to newext.
* The right neighbor is contiguous with the new allocation.
*/
+ old = PREV;
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
- xfs_bmbt_set_blockcount(ep,
- PREV.br_blockcount - new->br_blockcount);
+ PREV.br_blockcount -= new->br_blockcount;
+ xfs_iext_update_extent(ifp, *idx, &PREV);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);

++*idx;

trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
- xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
- new->br_startoff, new->br_startblock,
- new->br_blockcount + RIGHT.br_blockcount, newext);
+ RIGHT.br_startoff = new->br_startoff;
+ RIGHT.br_startblock = new->br_startblock;
+ RIGHT.br_blockcount += new->br_blockcount;
+ xfs_iext_update_extent(ifp, *idx, &RIGHT);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);

if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
- if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
- PREV.br_startblock,
- PREV.br_blockcount, &i)))
+ error = xfs_bmbt_lookup_eq(cur, old.br_startoff,
+ old.br_startblock, old.br_blockcount,
+ &i);
+ if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
- if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
- PREV.br_startblock,
- PREV.br_blockcount - new->br_blockcount,
- oldext)))
+ error = xfs_bmbt_update(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ PREV.br_state);
+ if (error)
goto done;
- if ((error = xfs_btree_increment(cur, 0, &i)))
+ error = xfs_btree_increment(cur, 0, &i);
+ if (error)
goto done;
- if ((error = xfs_bmbt_update(cur, new->br_startoff,
- new->br_startblock,
- new->br_blockcount + RIGHT.br_blockcount,
- newext)))
+ error = xfs_bmbt_update(cur, RIGHT.br_startoff,
+ RIGHT.br_startblock,
+ RIGHT.br_blockcount, RIGHT.br_state);
+ if (error)
goto done;
}
break;
@@ -2552,9 +2550,10 @@ xfs_bmap_add_extent_unwritten_real(
* Setting the last part of a previous oldext extent to newext.
* The right neighbor is not contiguous.
*/
+ old = PREV;
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
- xfs_bmbt_set_blockcount(ep,
- PREV.br_blockcount - new->br_blockcount);
+ PREV.br_blockcount -= new->br_blockcount;
+ xfs_iext_update_extent(ifp, *idx, &PREV);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);

++*idx;
@@ -2566,15 +2565,16 @@ xfs_bmap_add_extent_unwritten_real(
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
- if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
- PREV.br_startblock, PREV.br_blockcount,
- &i)))
+ error = xfs_bmbt_lookup_eq(cur, old.br_startoff,
+ old.br_startblock, old.br_blockcount,
+ &i);
+ if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
- if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
- PREV.br_startblock,
- PREV.br_blockcount - new->br_blockcount,
- oldext)))
+ error = xfs_bmbt_update(cur, PREV.br_startoff,
+ PREV.br_startblock, PREV.br_blockcount,
+ PREV.br_state);
+ if (error)
goto done;
if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
new->br_startblock, new->br_blockcount,
@@ -2594,17 +2594,18 @@ xfs_bmap_add_extent_unwritten_real(
* newext. Contiguity is impossible here.
* One extent becomes three extents.
*/
+ old = PREV;
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
- xfs_bmbt_set_blockcount(ep,
- new->br_startoff - PREV.br_startoff);
+ PREV.br_blockcount = new->br_startoff - PREV.br_startoff;
+ xfs_iext_update_extent(ifp, *idx, &PREV);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);

r[0] = *new;
r[1].br_startoff = new_endoff;
r[1].br_blockcount =
- PREV.br_startoff + PREV.br_blockcount - new_endoff;
+ old.br_startoff + old.br_blockcount - new_endoff;
r[1].br_startblock = new->br_startblock + new->br_blockcount;
- r[1].br_state = oldext;
+ r[1].br_state = PREV.br_state;

++*idx;
xfs_iext_insert(ip, *idx, 2, &r[0], state);
@@ -2615,9 +2616,10 @@ xfs_bmap_add_extent_unwritten_real(
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
- if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
- PREV.br_startblock, PREV.br_blockcount,
- &i)))
+ error = xfs_bmbt_lookup_eq(cur, old.br_startoff,
+ old.br_startblock, old.br_blockcount,
+ &i);
+ if (error)
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
/* new right extent - oldext */
@@ -2627,8 +2629,6 @@ xfs_bmap_add_extent_unwritten_real(
goto done;
/* new left extent - oldext */
cur->bc_rec.b = PREV;
- cur->bc_rec.b.br_blockcount =
- new->br_startoff - PREV.br_startoff;
if ((error = xfs_btree_insert(cur, &i)))
goto done;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
--
2.11.0