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xfs: cleanup bmap extent state macros 

Cleanup the extent state macros in the bmap code to use one common set of
flags that we can pass to the tracing code later and remove a lot of the
macro obsfucation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2009-11-25 00:00:19 +00:00 коммит произвёл Alex Elder
Родитель 3ea6b3d0e6
Коммит 7574aa92f9
2 изменённых файлов: 184 добавлений и 222 удалений
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394
fs/xfs/xfs_bmap.c
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@ -759,26 +759,10 @@ xfs_bmap_add_extent_delay_real(
xfs_filblks_t temp=0; /* value for dnew calculations */
xfs_filblks_t temp2=0;/* value for dnew calculations */
int tmp_rval; /* partial logging flags */
enum { /* bit number definitions for state */
LEFT_CONTIG, RIGHT_CONTIG,
LEFT_FILLING, RIGHT_FILLING,
LEFT_DELAY, RIGHT_DELAY,
LEFT_VALID, RIGHT_VALID
};
#define LEFT r[0]
#define RIGHT r[1]
#define PREV r[2]
#define MASK(b) (1 << (b))
#define MASK2(a,b) (MASK(a) | MASK(b))
#define MASK3(a,b,c) (MASK2(a,b) | MASK(c))
#define MASK4(a,b,c,d) (MASK3(a,b,c) | MASK(d))
#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
#define STATE_TEST(b) (state & MASK(b))
#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
((state &= ~MASK(b)), 0))
#define SWITCH_STATE \
(state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
/*
* Set up a bunch of variables to make the tests simpler.
@ -790,56 +774,69 @@ xfs_bmap_add_extent_delay_real(
new_endoff = new->br_startoff + new->br_blockcount;
ASSERT(PREV.br_startoff <= new->br_startoff);
ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
/*
* Set flags determining what part of the previous delayed allocation
* extent is being replaced by a real allocation.
*/
STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
STATE_SET(RIGHT_FILLING,
PREV.br_startoff + PREV.br_blockcount == new_endoff);
if (PREV.br_startoff == new->br_startoff)
state |= BMAP_LEFT_FILLING;
if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
state |= BMAP_RIGHT_FILLING;
/*
* Check and set flags if this segment has a left neighbor.
* Don't set contiguous if the combined extent would be too large.
*/
if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
if (idx > 0) {
state |= BMAP_LEFT_VALID;
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &LEFT);
STATE_SET(LEFT_DELAY, isnullstartblock(LEFT.br_startblock));
if (isnullstartblock(LEFT.br_startblock))
state |= BMAP_LEFT_DELAY;
}
STATE_SET(LEFT_CONTIG,
STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
LEFT.br_state == new->br_state &&
LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
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 == new->br_state &&
LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
state |= BMAP_LEFT_CONTIG;
/*
* Check and set flags if this segment has a right neighbor.
* Don't set contiguous if the combined extent would be too large.
* Also check for all-three-contiguous being too large.
*/
if (STATE_SET_TEST(RIGHT_VALID,
idx <
ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
if (idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
state |= BMAP_RIGHT_VALID;
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx + 1), &RIGHT);
STATE_SET(RIGHT_DELAY, isnullstartblock(RIGHT.br_startblock));
if (isnullstartblock(RIGHT.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
STATE_SET(RIGHT_CONTIG,
STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
new_endoff == RIGHT.br_startoff &&
new->br_startblock + new->br_blockcount ==
RIGHT.br_startblock &&
new->br_state == RIGHT.br_state &&
new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
<= MAXEXTLEN));
if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
new_endoff == RIGHT.br_startoff &&
new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
new->br_state == RIGHT.br_state &&
new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING)) !=
(BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING) ||
LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
<= MAXEXTLEN))
state |= BMAP_RIGHT_CONTIG;
error = 0;
/*
* Switch out based on the FILLING and CONTIG state bits.
*/
switch (SWITCH_STATE) {
case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Filling in all of a previously delayed allocation extent.
* The left and right neighbors are both contiguous with new.
@ -885,7 +882,7 @@ xfs_bmap_add_extent_delay_real(
RIGHT.br_blockcount;
break;
case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
/*
* Filling in all of a previously delayed allocation extent.
* The left neighbor is contiguous, the right is not.
@ -921,7 +918,7 @@ xfs_bmap_add_extent_delay_real(
PREV.br_blockcount;
break;
case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Filling in all of a previously delayed allocation extent.
* The right neighbor is contiguous, the left is not.
@ -956,7 +953,7 @@ xfs_bmap_add_extent_delay_real(
RIGHT.br_blockcount;
break;
case MASK2(LEFT_FILLING, RIGHT_FILLING):
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
/*
* Filling in all of a previously delayed allocation extent.
* Neither the left nor right neighbors are contiguous with
@ -987,7 +984,7 @@ xfs_bmap_add_extent_delay_real(
temp2 = new->br_blockcount;
break;
case MASK2(LEFT_FILLING, LEFT_CONTIG):
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
/*
* Filling in the first part of a previous delayed allocation.
* The left neighbor is contiguous.
@ -1029,7 +1026,7 @@ xfs_bmap_add_extent_delay_real(
PREV.br_blockcount;
break;
case MASK(LEFT_FILLING):
case BMAP_LEFT_FILLING:
/*
* Filling in the first part of a previous delayed allocation.
* The left neighbor is not contiguous.
@ -1078,7 +1075,7 @@ xfs_bmap_add_extent_delay_real(
temp2 = PREV.br_blockcount;
break;
case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Filling in the last part of a previous delayed allocation.
* The right neighbor is contiguous with the new allocation.
@ -1120,7 +1117,7 @@ xfs_bmap_add_extent_delay_real(
RIGHT.br_blockcount;
break;
case MASK(RIGHT_FILLING):
case BMAP_RIGHT_FILLING:
/*
* Filling in the last part of a previous delayed allocation.
* The right neighbor is not contiguous.
@ -1253,13 +1250,13 @@ xfs_bmap_add_extent_delay_real(
temp2 = PREV.br_blockcount;
break;
case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
case MASK2(LEFT_FILLING, RIGHT_CONTIG):
case MASK2(RIGHT_FILLING, LEFT_CONTIG):
case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
case MASK(LEFT_CONTIG):
case MASK(RIGHT_CONTIG):
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_CONTIG:
case BMAP_RIGHT_CONTIG:
/*
* These cases are all impossible.
*/
@ -1279,14 +1276,6 @@ done:
#undef LEFT
#undef RIGHT
#undef PREV
#undef MASK
#undef MASK2
#undef MASK3
#undef MASK4
#undef STATE_SET
#undef STATE_TEST
#undef STATE_SET_TEST
#undef SWITCH_STATE
}
/*
@ -1316,27 +1305,10 @@ xfs_bmap_add_extent_unwritten_real(
int state = 0;/* state bits, accessed thru macros */
xfs_filblks_t temp=0;
xfs_filblks_t temp2=0;
enum { /* bit number definitions for state */
LEFT_CONTIG, RIGHT_CONTIG,
LEFT_FILLING, RIGHT_FILLING,
LEFT_DELAY, RIGHT_DELAY,
LEFT_VALID, RIGHT_VALID
};
#define LEFT r[0]
#define RIGHT r[1]
#define PREV r[2]
#define MASK(b) (1 << (b))
#define MASK2(a,b) (MASK(a) | MASK(b))
#define MASK3(a,b,c) (MASK2(a,b) | MASK(c))
#define MASK4(a,b,c,d) (MASK3(a,b,c) | MASK(d))
#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
#define STATE_TEST(b) (state & MASK(b))
#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
((state &= ~MASK(b)), 0))
#define SWITCH_STATE \
(state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
/*
* Set up a bunch of variables to make the tests simpler.
*/
@ -1352,55 +1324,67 @@ xfs_bmap_add_extent_unwritten_real(
new_endoff = new->br_startoff + new->br_blockcount;
ASSERT(PREV.br_startoff <= new->br_startoff);
ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
/*
* Set flags determining what part of the previous oldext allocation
* extent is being replaced by a newext allocation.
*/
STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
STATE_SET(RIGHT_FILLING,
PREV.br_startoff + PREV.br_blockcount == new_endoff);
if (PREV.br_startoff == new->br_startoff)
state |= BMAP_LEFT_FILLING;
if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
state |= BMAP_RIGHT_FILLING;
/*
* Check and set flags if this segment has a left neighbor.
* Don't set contiguous if the combined extent would be too large.
*/
if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
if (idx > 0) {
state |= BMAP_LEFT_VALID;
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &LEFT);
STATE_SET(LEFT_DELAY, isnullstartblock(LEFT.br_startblock));
if (isnullstartblock(LEFT.br_startblock))
state |= BMAP_LEFT_DELAY;
}
STATE_SET(LEFT_CONTIG,
STATE_TEST(LEFT_VALID) && !STATE_TEST(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_blockcount + new->br_blockcount <= MAXEXTLEN);
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_blockcount + new->br_blockcount <= MAXEXTLEN)
state |= BMAP_LEFT_CONTIG;
/*
* Check and set flags if this segment has a right neighbor.
* Don't set contiguous if the combined extent would be too large.
* Also check for all-three-contiguous being too large.
*/
if (STATE_SET_TEST(RIGHT_VALID,
idx <
ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
if (idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) {
state |= BMAP_RIGHT_VALID;
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx + 1), &RIGHT);
STATE_SET(RIGHT_DELAY, isnullstartblock(RIGHT.br_startblock));
if (isnullstartblock(RIGHT.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
STATE_SET(RIGHT_CONTIG,
STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
new_endoff == RIGHT.br_startoff &&
new->br_startblock + new->br_blockcount ==
RIGHT.br_startblock &&
newext == RIGHT.br_state &&
new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
<= MAXEXTLEN));
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_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING)) !=
(BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING) ||
LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
<= MAXEXTLEN))
state |= BMAP_RIGHT_CONTIG;
/*
* Switch out based on the FILLING and CONTIG state bits.
*/
switch (SWITCH_STATE) {
case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Setting all of a previous oldext extent to newext.
* The left and right neighbors are both contiguous with new.
@ -1450,7 +1434,7 @@ xfs_bmap_add_extent_unwritten_real(
RIGHT.br_blockcount;
break;
case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
/*
* Setting all of a previous oldext extent to newext.
* The left neighbor is contiguous, the right is not.
@ -1492,7 +1476,7 @@ xfs_bmap_add_extent_unwritten_real(
PREV.br_blockcount;
break;
case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Setting all of a previous oldext extent to newext.
* The right neighbor is contiguous, the left is not.
@ -1535,7 +1519,7 @@ xfs_bmap_add_extent_unwritten_real(
RIGHT.br_blockcount;
break;
case MASK2(LEFT_FILLING, RIGHT_FILLING):
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
/*
* Setting all of a previous oldext extent to newext.
* Neither the left nor right neighbors are contiguous with
@ -1566,7 +1550,7 @@ xfs_bmap_add_extent_unwritten_real(
temp2 = new->br_blockcount;
break;
case MASK2(LEFT_FILLING, LEFT_CONTIG):
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
/*
* Setting the first part of a previous oldext extent to newext.
* The left neighbor is contiguous.
@ -1617,7 +1601,7 @@ xfs_bmap_add_extent_unwritten_real(
PREV.br_blockcount;
break;
case MASK(LEFT_FILLING):
case BMAP_LEFT_FILLING:
/*
* Setting the first part of a previous oldext extent to newext.
* The left neighbor is not contiguous.
@ -1660,7 +1644,7 @@ xfs_bmap_add_extent_unwritten_real(
temp2 = PREV.br_blockcount;
break;
case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Setting the last part of a previous oldext extent to newext.
* The right neighbor is contiguous with the new allocation.
@ -1707,7 +1691,7 @@ xfs_bmap_add_extent_unwritten_real(
RIGHT.br_blockcount;
break;
case MASK(RIGHT_FILLING):
case BMAP_RIGHT_FILLING:
/*
* Setting the last part of a previous oldext extent to newext.
* The right neighbor is not contiguous.
@ -1813,13 +1797,13 @@ xfs_bmap_add_extent_unwritten_real(
temp2 = PREV.br_blockcount;
break;
case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
case MASK2(LEFT_FILLING, RIGHT_CONTIG):
case MASK2(RIGHT_FILLING, LEFT_CONTIG):
case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
case MASK(LEFT_CONTIG):
case MASK(RIGHT_CONTIG):
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_CONTIG:
case BMAP_RIGHT_CONTIG:
/*
* These cases are all impossible.
*/
@ -1839,14 +1823,6 @@ done:
#undef LEFT
#undef RIGHT
#undef PREV
#undef MASK
#undef MASK2
#undef MASK3
#undef MASK4
#undef STATE_SET
#undef STATE_TEST
#undef STATE_SET_TEST
#undef SWITCH_STATE
}
/*
@ -1872,62 +1848,57 @@ xfs_bmap_add_extent_hole_delay(
int state; /* state bits, accessed thru macros */
xfs_filblks_t temp=0; /* temp for indirect calculations */
xfs_filblks_t temp2=0;
enum { /* bit number definitions for state */
LEFT_CONTIG, RIGHT_CONTIG,
LEFT_DELAY, RIGHT_DELAY,
LEFT_VALID, RIGHT_VALID
};
#define MASK(b) (1 << (b))
#define MASK2(a,b) (MASK(a) | MASK(b))
#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
#define STATE_TEST(b) (state & MASK(b))
#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
((state &= ~MASK(b)), 0))
#define SWITCH_STATE (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
ep = xfs_iext_get_ext(ifp, idx);
state = 0;
ASSERT(isnullstartblock(new->br_startblock));
/*
* Check and set flags if this segment has a left neighbor
*/
if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
if (idx > 0) {
state |= BMAP_LEFT_VALID;
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &left);
STATE_SET(LEFT_DELAY, isnullstartblock(left.br_startblock));
if (isnullstartblock(left.br_startblock))
state |= BMAP_LEFT_DELAY;
}
/*
* Check and set flags if the current (right) segment exists.
* If it doesn't exist, we're converting the hole at end-of-file.
*/
if (STATE_SET_TEST(RIGHT_VALID,
idx <
ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
if (idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
state |= BMAP_RIGHT_VALID;
xfs_bmbt_get_all(ep, &right);
STATE_SET(RIGHT_DELAY, isnullstartblock(right.br_startblock));
if (isnullstartblock(right.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
/*
* Set contiguity flags on the left and right neighbors.
* Don't let extents get too large, even if the pieces are contiguous.
*/
STATE_SET(LEFT_CONTIG,
STATE_TEST(LEFT_VALID) && STATE_TEST(LEFT_DELAY) &&
left.br_startoff + left.br_blockcount == new->br_startoff &&
left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
STATE_SET(RIGHT_CONTIG,
STATE_TEST(RIGHT_VALID) && STATE_TEST(RIGHT_DELAY) &&
new->br_startoff + new->br_blockcount == right.br_startoff &&
new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
(!STATE_TEST(LEFT_CONTIG) ||
(left.br_blockcount + new->br_blockcount +
right.br_blockcount <= MAXEXTLEN)));
if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
left.br_startoff + left.br_blockcount == new->br_startoff &&
left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
state |= BMAP_LEFT_CONTIG;
if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
new->br_startoff + new->br_blockcount == right.br_startoff &&
new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
(!(state & BMAP_LEFT_CONTIG) ||
(left.br_blockcount + new->br_blockcount +
right.br_blockcount <= MAXEXTLEN)))
state |= BMAP_RIGHT_CONTIG;
/*
* Switch out based on the contiguity flags.
*/
switch (SWITCH_STATE) {
case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with delayed allocations
* on the left and on the right.
@ -1954,7 +1925,7 @@ xfs_bmap_add_extent_hole_delay(
temp = left.br_startoff;
break;
case MASK(LEFT_CONTIG):
case BMAP_LEFT_CONTIG:
/*
* New allocation is contiguous with a delayed allocation
* on the left.
@ -1977,7 +1948,7 @@ xfs_bmap_add_extent_hole_delay(
temp = left.br_startoff;
break;
case MASK(RIGHT_CONTIG):
case BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with a delayed allocation
* on the right.
@ -2030,12 +2001,6 @@ xfs_bmap_add_extent_hole_delay(
}
*logflagsp = 0;
return 0;
#undef MASK
#undef MASK2
#undef STATE_SET
#undef STATE_TEST
#undef STATE_SET_TEST
#undef SWITCH_STATE
}
/*
@ -2062,69 +2027,60 @@ xfs_bmap_add_extent_hole_real(
int state; /* state bits, accessed thru macros */
xfs_filblks_t temp=0;
xfs_filblks_t temp2=0;
enum { /* bit number definitions for state */
LEFT_CONTIG, RIGHT_CONTIG,
LEFT_DELAY, RIGHT_DELAY,
LEFT_VALID, RIGHT_VALID
};
#define MASK(b) (1 << (b))
#define MASK2(a,b) (MASK(a) | MASK(b))
#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
#define STATE_TEST(b) (state & MASK(b))
#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
((state &= ~MASK(b)), 0))
#define SWITCH_STATE (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(idx <= ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
ep = xfs_iext_get_ext(ifp, idx);
state = 0;
/*
* Check and set flags if this segment has a left neighbor.
*/
if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
if (idx > 0) {
state |= BMAP_LEFT_VALID;
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx - 1), &left);
STATE_SET(LEFT_DELAY, isnullstartblock(left.br_startblock));
if (isnullstartblock(left.br_startblock))
state |= BMAP_LEFT_DELAY;
}
/*
* Check and set flags if this segment has a current value.
* Not true if we're inserting into the "hole" at eof.
*/
if (STATE_SET_TEST(RIGHT_VALID,
idx <
ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
if (idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
state |= BMAP_RIGHT_VALID;
xfs_bmbt_get_all(ep, &right);
STATE_SET(RIGHT_DELAY, isnullstartblock(right.br_startblock));
if (isnullstartblock(right.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
/*
* We're inserting a real allocation between "left" and "right".
* Set the contiguity flags. Don't let extents get too large.
*/
STATE_SET(LEFT_CONTIG,
STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
left.br_startoff + left.br_blockcount == new->br_startoff &&
left.br_startblock + left.br_blockcount == new->br_startblock &&
left.br_state == new->br_state &&
left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
STATE_SET(RIGHT_CONTIG,
STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
new->br_startoff + new->br_blockcount == right.br_startoff &&
new->br_startblock + new->br_blockcount ==
right.br_startblock &&
new->br_state == right.br_state &&
new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
(!STATE_TEST(LEFT_CONTIG) ||
left.br_blockcount + new->br_blockcount +
right.br_blockcount <= MAXEXTLEN));
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 == new->br_state &&
left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
state |= BMAP_LEFT_CONTIG;
if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
new->br_startoff + new->br_blockcount == right.br_startoff &&
new->br_startblock + new->br_blockcount == right.br_startblock &&
new->br_state == right.br_state &&
new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
(!(state & BMAP_LEFT_CONTIG) ||
left.br_blockcount + new->br_blockcount +
right.br_blockcount <= MAXEXTLEN))
state |= BMAP_RIGHT_CONTIG;
error = 0;
/*
* Select which case we're in here, and implement it.
*/
switch (SWITCH_STATE) {
case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with real allocations on the
* left and on the right.
@ -2173,7 +2129,7 @@ xfs_bmap_add_extent_hole_real(
right.br_blockcount;
break;
case MASK(LEFT_CONTIG):
case BMAP_LEFT_CONTIG:
/*
* New allocation is contiguous with a real allocation
* on the left.
@ -2207,7 +2163,7 @@ xfs_bmap_add_extent_hole_real(
new->br_blockcount;
break;
case MASK(RIGHT_CONTIG):
case BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with a real allocation
* on the right.
@ -2283,12 +2239,6 @@ xfs_bmap_add_extent_hole_real(
done:
*logflagsp = rval;
return error;
#undef MASK
#undef MASK2
#undef STATE_SET
#undef STATE_TEST
#undef STATE_SET_TEST
#undef SWITCH_STATE
}
/*

12
fs/xfs/xfs_bmap.h
Просмотреть файл

@ -135,6 +135,18 @@ typedef struct xfs_bmalloca {
char conv; /* overwriting unwritten extents */
} xfs_bmalloca_t;
/*
* Flags for xfs_bmap_add_extent*.
*/
#define BMAP_LEFT_CONTIG (1 << 0)
#define BMAP_RIGHT_CONTIG (1 << 1)
#define BMAP_LEFT_FILLING (1 << 2)
#define BMAP_RIGHT_FILLING (1 << 3)
#define BMAP_LEFT_DELAY (1 << 4)
#define BMAP_RIGHT_DELAY (1 << 5)
#define BMAP_LEFT_VALID (1 << 6)
#define BMAP_RIGHT_VALID (1 << 7)
#if defined(__KERNEL__) && defined(XFS_BMAP_TRACE)
/*
* Trace operations for bmap extent tracing