[XFS] Reduce stack usage within xfs_bmapi by rearranging some code,
splitting realtime/btree allocators apart. Based on Glens original patches. SGI-PV: 947312 SGI-Modid: xfs-linux-melb:xfs-kern:25372a Signed-off-by: Nathan Scott <nathans@sgi.com>
This commit is contained in:
Nathan Scott
parent
39269e29d4
commit
a365bdd5e8
|
|
@ -2294,25 +2294,15 @@ xfs_bmap_extsize_align(
|
|||
|
||||
#define XFS_ALLOC_GAP_UNITS 4
|
||||
|
||||
/*
|
||||
* xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
|
||||
* It figures out where to ask the underlying allocator to put the new extent.
|
||||
*/
|
||||
STATIC int
|
||||
xfs_bmap_alloc(
|
||||
xfs_bmap_adjacent(
|
||||
xfs_bmalloca_t *ap) /* bmap alloc argument struct */
|
||||
{
|
||||
xfs_fsblock_t adjust; /* adjustment to block numbers */
|
||||
xfs_alloctype_t atype=0; /* type for allocation routines */
|
||||
int error; /* error return value */
|
||||
xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
|
||||
xfs_mount_t *mp; /* mount point structure */
|
||||
int nullfb; /* true if ap->firstblock isn't set */
|
||||
int rt; /* true if inode is realtime */
|
||||
xfs_extlen_t prod = 0; /* product factor for allocators */
|
||||
xfs_extlen_t ralen = 0; /* realtime allocation length */
|
||||
xfs_extlen_t align; /* minimum allocation alignment */
|
||||
xfs_rtblock_t rtx;
|
||||
|
||||
#define ISVALID(x,y) \
|
||||
(rt ? \
|
||||
|
|
@ -2321,75 +2311,10 @@ xfs_bmap_alloc(
|
|||
XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
|
||||
XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
|
||||
|
||||
/*
|
||||
* Set up variables.
|
||||
*/
|
||||
mp = ap->ip->i_mount;
|
||||
nullfb = ap->firstblock == NULLFSBLOCK;
|
||||
rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
|
||||
fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
|
||||
if (rt) {
|
||||
align = ap->ip->i_d.di_extsize ?
|
||||
ap->ip->i_d.di_extsize : mp->m_sb.sb_rextsize;
|
||||
/* Set prod to match the extent size */
|
||||
prod = align / mp->m_sb.sb_rextsize;
|
||||
|
||||
error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
|
||||
align, rt, ap->eof, 0,
|
||||
ap->conv, &ap->off, &ap->alen);
|
||||
if (error)
|
||||
return error;
|
||||
ASSERT(ap->alen);
|
||||
ASSERT(ap->alen % mp->m_sb.sb_rextsize == 0);
|
||||
|
||||
/*
|
||||
* If the offset & length are not perfectly aligned
|
||||
* then kill prod, it will just get us in trouble.
|
||||
*/
|
||||
if (do_mod(ap->off, align) || ap->alen % align)
|
||||
prod = 1;
|
||||
/*
|
||||
* Set ralen to be the actual requested length in rtextents.
|
||||
*/
|
||||
ralen = ap->alen / mp->m_sb.sb_rextsize;
|
||||
/*
|
||||
* If the old value was close enough to MAXEXTLEN that
|
||||
* we rounded up to it, cut it back so it's valid again.
|
||||
* Note that if it's a really large request (bigger than
|
||||
* MAXEXTLEN), we don't hear about that number, and can't
|
||||
* adjust the starting point to match it.
|
||||
*/
|
||||
if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
|
||||
ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
|
||||
/*
|
||||
* If it's an allocation to an empty file at offset 0,
|
||||
* pick an extent that will space things out in the rt area.
|
||||
*/
|
||||
if (ap->eof && ap->off == 0) {
|
||||
error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
|
||||
if (error)
|
||||
return error;
|
||||
ap->rval = rtx * mp->m_sb.sb_rextsize;
|
||||
} else
|
||||
ap->rval = 0;
|
||||
} else {
|
||||
align = (ap->userdata && ap->ip->i_d.di_extsize &&
|
||||
(ap->ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)) ?
|
||||
ap->ip->i_d.di_extsize : 0;
|
||||
if (unlikely(align)) {
|
||||
error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
|
||||
align, rt,
|
||||
ap->eof, 0, ap->conv,
|
||||
&ap->off, &ap->alen);
|
||||
ASSERT(!error);
|
||||
ASSERT(ap->alen);
|
||||
}
|
||||
if (nullfb)
|
||||
ap->rval = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
|
||||
else
|
||||
ap->rval = ap->firstblock;
|
||||
}
|
||||
|
||||
/*
|
||||
* If allocating at eof, and there's a previous real block,
|
||||
* try to use it's last block as our starting point.
|
||||
|
|
@ -2514,281 +2439,378 @@ xfs_bmap_alloc(
|
|||
else if (gotbno != NULLFSBLOCK)
|
||||
ap->rval = gotbno;
|
||||
}
|
||||
#undef ISVALID
|
||||
return 0;
|
||||
}
|
||||
|
||||
STATIC int
|
||||
xfs_bmap_rtalloc(
|
||||
xfs_bmalloca_t *ap) /* bmap alloc argument struct */
|
||||
{
|
||||
xfs_alloctype_t atype = 0; /* type for allocation routines */
|
||||
int error; /* error return value */
|
||||
xfs_mount_t *mp; /* mount point structure */
|
||||
xfs_extlen_t prod = 0; /* product factor for allocators */
|
||||
xfs_extlen_t ralen = 0; /* realtime allocation length */
|
||||
xfs_extlen_t align; /* minimum allocation alignment */
|
||||
xfs_rtblock_t rtx; /* realtime extent number */
|
||||
xfs_rtblock_t rtb;
|
||||
|
||||
mp = ap->ip->i_mount;
|
||||
align = ap->ip->i_d.di_extsize ?
|
||||
ap->ip->i_d.di_extsize : mp->m_sb.sb_rextsize;
|
||||
prod = align / mp->m_sb.sb_rextsize;
|
||||
error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
|
||||
align, 1, ap->eof, 0,
|
||||
ap->conv, &ap->off, &ap->alen);
|
||||
if (error)
|
||||
return error;
|
||||
ASSERT(ap->alen);
|
||||
ASSERT(ap->alen % mp->m_sb.sb_rextsize == 0);
|
||||
|
||||
/*
|
||||
* If the offset & length are not perfectly aligned
|
||||
* then kill prod, it will just get us in trouble.
|
||||
*/
|
||||
if (do_mod(ap->off, align) || ap->alen % align)
|
||||
prod = 1;
|
||||
/*
|
||||
* Set ralen to be the actual requested length in rtextents.
|
||||
*/
|
||||
ralen = ap->alen / mp->m_sb.sb_rextsize;
|
||||
/*
|
||||
* If the old value was close enough to MAXEXTLEN that
|
||||
* we rounded up to it, cut it back so it's valid again.
|
||||
* Note that if it's a really large request (bigger than
|
||||
* MAXEXTLEN), we don't hear about that number, and can't
|
||||
* adjust the starting point to match it.
|
||||
*/
|
||||
if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
|
||||
ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
|
||||
/*
|
||||
* If it's an allocation to an empty file at offset 0,
|
||||
* pick an extent that will space things out in the rt area.
|
||||
*/
|
||||
if (ap->eof && ap->off == 0) {
|
||||
error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
|
||||
if (error)
|
||||
return error;
|
||||
ap->rval = rtx * mp->m_sb.sb_rextsize;
|
||||
} else {
|
||||
ap->rval = 0;
|
||||
}
|
||||
|
||||
xfs_bmap_adjacent(ap);
|
||||
|
||||
/*
|
||||
* Realtime allocation, done through xfs_rtallocate_extent.
|
||||
*/
|
||||
atype = ap->rval == 0 ? XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
|
||||
do_div(ap->rval, mp->m_sb.sb_rextsize);
|
||||
rtb = ap->rval;
|
||||
ap->alen = ralen;
|
||||
if ((error = xfs_rtallocate_extent(ap->tp, ap->rval, 1, ap->alen,
|
||||
&ralen, atype, ap->wasdel, prod, &rtb)))
|
||||
return error;
|
||||
if (rtb == NULLFSBLOCK && prod > 1 &&
|
||||
(error = xfs_rtallocate_extent(ap->tp, ap->rval, 1,
|
||||
ap->alen, &ralen, atype,
|
||||
ap->wasdel, 1, &rtb)))
|
||||
return error;
|
||||
ap->rval = rtb;
|
||||
if (ap->rval != NULLFSBLOCK) {
|
||||
ap->rval *= mp->m_sb.sb_rextsize;
|
||||
ralen *= mp->m_sb.sb_rextsize;
|
||||
ap->alen = ralen;
|
||||
ap->ip->i_d.di_nblocks += ralen;
|
||||
xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
|
||||
if (ap->wasdel)
|
||||
ap->ip->i_delayed_blks -= ralen;
|
||||
/*
|
||||
* Adjust the disk quota also. This was reserved
|
||||
* earlier.
|
||||
*/
|
||||
XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
|
||||
ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
|
||||
XFS_TRANS_DQ_RTBCOUNT, (long) ralen);
|
||||
} else {
|
||||
ap->alen = 0;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
STATIC int
|
||||
xfs_bmap_btalloc(
|
||||
xfs_bmalloca_t *ap) /* bmap alloc argument struct */
|
||||
{
|
||||
xfs_mount_t *mp; /* mount point structure */
|
||||
xfs_alloctype_t atype = 0; /* type for allocation routines */
|
||||
xfs_extlen_t align; /* minimum allocation alignment */
|
||||
xfs_agnumber_t ag;
|
||||
xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
|
||||
xfs_agnumber_t startag;
|
||||
xfs_alloc_arg_t args;
|
||||
xfs_extlen_t blen;
|
||||
xfs_extlen_t delta;
|
||||
xfs_extlen_t longest;
|
||||
xfs_extlen_t need;
|
||||
xfs_extlen_t nextminlen = 0;
|
||||
xfs_perag_t *pag;
|
||||
int nullfb; /* true if ap->firstblock isn't set */
|
||||
int isaligned;
|
||||
int notinit;
|
||||
int tryagain;
|
||||
int error;
|
||||
|
||||
mp = ap->ip->i_mount;
|
||||
align = (ap->userdata && ap->ip->i_d.di_extsize &&
|
||||
(ap->ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)) ?
|
||||
ap->ip->i_d.di_extsize : 0;
|
||||
if (unlikely(align)) {
|
||||
error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
|
||||
align, 0, ap->eof, 0, ap->conv,
|
||||
&ap->off, &ap->alen);
|
||||
ASSERT(!error);
|
||||
ASSERT(ap->alen);
|
||||
}
|
||||
nullfb = ap->firstblock == NULLFSBLOCK;
|
||||
fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
|
||||
if (nullfb)
|
||||
ap->rval = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
|
||||
else
|
||||
ap->rval = ap->firstblock;
|
||||
|
||||
xfs_bmap_adjacent(ap);
|
||||
|
||||
/*
|
||||
* If allowed, use ap->rval; otherwise must use firstblock since
|
||||
* it's in the right allocation group.
|
||||
*/
|
||||
if (nullfb || rt || XFS_FSB_TO_AGNO(mp, ap->rval) == fb_agno)
|
||||
if (nullfb || XFS_FSB_TO_AGNO(mp, ap->rval) == fb_agno)
|
||||
;
|
||||
else
|
||||
ap->rval = ap->firstblock;
|
||||
/*
|
||||
* Realtime allocation, done through xfs_rtallocate_extent.
|
||||
*/
|
||||
if (rt) {
|
||||
#ifndef __KERNEL__
|
||||
ASSERT(0);
|
||||
#else
|
||||
xfs_rtblock_t rtb;
|
||||
|
||||
atype = ap->rval == 0 ?
|
||||
XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
|
||||
do_div(ap->rval, mp->m_sb.sb_rextsize);
|
||||
rtb = ap->rval;
|
||||
ap->alen = ralen;
|
||||
if ((error = xfs_rtallocate_extent(ap->tp, ap->rval, 1, ap->alen,
|
||||
&ralen, atype, ap->wasdel, prod, &rtb)))
|
||||
return error;
|
||||
if (rtb == NULLFSBLOCK && prod > 1 &&
|
||||
(error = xfs_rtallocate_extent(ap->tp, ap->rval, 1,
|
||||
ap->alen, &ralen, atype,
|
||||
ap->wasdel, 1, &rtb)))
|
||||
return error;
|
||||
ap->rval = rtb;
|
||||
if (ap->rval != NULLFSBLOCK) {
|
||||
ap->rval *= mp->m_sb.sb_rextsize;
|
||||
ralen *= mp->m_sb.sb_rextsize;
|
||||
ap->alen = ralen;
|
||||
ap->ip->i_d.di_nblocks += ralen;
|
||||
xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
|
||||
if (ap->wasdel)
|
||||
ap->ip->i_delayed_blks -= ralen;
|
||||
/*
|
||||
* Adjust the disk quota also. This was reserved
|
||||
* earlier.
|
||||
*/
|
||||
XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
|
||||
ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
|
||||
XFS_TRANS_DQ_RTBCOUNT,
|
||||
(long) ralen);
|
||||
} else
|
||||
ap->alen = 0;
|
||||
#endif /* __KERNEL__ */
|
||||
}
|
||||
/*
|
||||
* Normal allocation, done through xfs_alloc_vextent.
|
||||
*/
|
||||
else {
|
||||
xfs_agnumber_t ag;
|
||||
xfs_alloc_arg_t args;
|
||||
xfs_extlen_t blen;
|
||||
xfs_extlen_t delta;
|
||||
int isaligned;
|
||||
xfs_extlen_t longest;
|
||||
xfs_extlen_t need;
|
||||
xfs_extlen_t nextminlen=0;
|
||||
int notinit;
|
||||
xfs_perag_t *pag;
|
||||
xfs_agnumber_t startag;
|
||||
int tryagain;
|
||||
|
||||
tryagain = isaligned = 0;
|
||||
args.tp = ap->tp;
|
||||
args.mp = mp;
|
||||
args.fsbno = ap->rval;
|
||||
args.maxlen = MIN(ap->alen, mp->m_sb.sb_agblocks);
|
||||
blen = 0;
|
||||
if (nullfb) {
|
||||
args.type = XFS_ALLOCTYPE_START_BNO;
|
||||
args.total = ap->total;
|
||||
/*
|
||||
* Find the longest available space.
|
||||
* We're going to try for the whole allocation at once.
|
||||
*/
|
||||
startag = ag = XFS_FSB_TO_AGNO(mp, args.fsbno);
|
||||
notinit = 0;
|
||||
down_read(&mp->m_peraglock);
|
||||
while (blen < ap->alen) {
|
||||
pag = &mp->m_perag[ag];
|
||||
if (!pag->pagf_init &&
|
||||
(error = xfs_alloc_pagf_init(mp, args.tp,
|
||||
ag, XFS_ALLOC_FLAG_TRYLOCK))) {
|
||||
up_read(&mp->m_peraglock);
|
||||
return error;
|
||||
}
|
||||
/*
|
||||
* See xfs_alloc_fix_freelist...
|
||||
*/
|
||||
if (pag->pagf_init) {
|
||||
need = XFS_MIN_FREELIST_PAG(pag, mp);
|
||||
delta = need > pag->pagf_flcount ?
|
||||
need - pag->pagf_flcount : 0;
|
||||
longest = (pag->pagf_longest > delta) ?
|
||||
(pag->pagf_longest - delta) :
|
||||
(pag->pagf_flcount > 0 ||
|
||||
pag->pagf_longest > 0);
|
||||
if (blen < longest)
|
||||
blen = longest;
|
||||
} else
|
||||
notinit = 1;
|
||||
if (++ag == mp->m_sb.sb_agcount)
|
||||
ag = 0;
|
||||
if (ag == startag)
|
||||
break;
|
||||
}
|
||||
up_read(&mp->m_peraglock);
|
||||
/*
|
||||
* Since the above loop did a BUF_TRYLOCK, it is
|
||||
* possible that there is space for this request.
|
||||
*/
|
||||
if (notinit || blen < ap->minlen)
|
||||
args.minlen = ap->minlen;
|
||||
/*
|
||||
* If the best seen length is less than the request
|
||||
* length, use the best as the minimum.
|
||||
*/
|
||||
else if (blen < ap->alen)
|
||||
args.minlen = blen;
|
||||
/*
|
||||
* Otherwise we've seen an extent as big as alen,
|
||||
* use that as the minimum.
|
||||
*/
|
||||
else
|
||||
args.minlen = ap->alen;
|
||||
} else if (ap->low) {
|
||||
args.type = XFS_ALLOCTYPE_FIRST_AG;
|
||||
args.total = args.minlen = ap->minlen;
|
||||
} else {
|
||||
args.type = XFS_ALLOCTYPE_NEAR_BNO;
|
||||
args.total = ap->total;
|
||||
args.minlen = ap->minlen;
|
||||
}
|
||||
if (unlikely(ap->userdata && ap->ip->i_d.di_extsize &&
|
||||
(ap->ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE))) {
|
||||
args.prod = ap->ip->i_d.di_extsize;
|
||||
if ((args.mod = (xfs_extlen_t)do_mod(ap->off, args.prod)))
|
||||
args.mod = (xfs_extlen_t)(args.prod - args.mod);
|
||||
} else if (unlikely(mp->m_sb.sb_blocksize >= NBPP)) {
|
||||
args.prod = 1;
|
||||
args.mod = 0;
|
||||
} else {
|
||||
args.prod = NBPP >> mp->m_sb.sb_blocklog;
|
||||
if ((args.mod = (xfs_extlen_t)(do_mod(ap->off, args.prod))))
|
||||
args.mod = (xfs_extlen_t)(args.prod - args.mod);
|
||||
}
|
||||
tryagain = isaligned = 0;
|
||||
args.tp = ap->tp;
|
||||
args.mp = mp;
|
||||
args.fsbno = ap->rval;
|
||||
args.maxlen = MIN(ap->alen, mp->m_sb.sb_agblocks);
|
||||
blen = 0;
|
||||
if (nullfb) {
|
||||
args.type = XFS_ALLOCTYPE_START_BNO;
|
||||
args.total = ap->total;
|
||||
/*
|
||||
* If we are not low on available data blocks, and the
|
||||
* underlying logical volume manager is a stripe, and
|
||||
* the file offset is zero then try to allocate data
|
||||
* blocks on stripe unit boundary.
|
||||
* NOTE: ap->aeof is only set if the allocation length
|
||||
* is >= the stripe unit and the allocation offset is
|
||||
* at the end of file.
|
||||
* Find the longest available space.
|
||||
* We're going to try for the whole allocation at once.
|
||||
*/
|
||||
if (!ap->low && ap->aeof) {
|
||||
if (!ap->off) {
|
||||
args.alignment = mp->m_dalign;
|
||||
atype = args.type;
|
||||
isaligned = 1;
|
||||
/*
|
||||
* Adjust for alignment
|
||||
*/
|
||||
if (blen > args.alignment && blen <= ap->alen)
|
||||
args.minlen = blen - args.alignment;
|
||||
args.minalignslop = 0;
|
||||
} else {
|
||||
/*
|
||||
* First try an exact bno allocation.
|
||||
* If it fails then do a near or start bno
|
||||
* allocation with alignment turned on.
|
||||
*/
|
||||
atype = args.type;
|
||||
tryagain = 1;
|
||||
args.type = XFS_ALLOCTYPE_THIS_BNO;
|
||||
args.alignment = 1;
|
||||
/*
|
||||
* Compute the minlen+alignment for the
|
||||
* next case. Set slop so that the value
|
||||
* of minlen+alignment+slop doesn't go up
|
||||
* between the calls.
|
||||
*/
|
||||
if (blen > mp->m_dalign && blen <= ap->alen)
|
||||
nextminlen = blen - mp->m_dalign;
|
||||
else
|
||||
nextminlen = args.minlen;
|
||||
if (nextminlen + mp->m_dalign > args.minlen + 1)
|
||||
args.minalignslop =
|
||||
nextminlen + mp->m_dalign -
|
||||
args.minlen - 1;
|
||||
else
|
||||
args.minalignslop = 0;
|
||||
startag = ag = XFS_FSB_TO_AGNO(mp, args.fsbno);
|
||||
notinit = 0;
|
||||
down_read(&mp->m_peraglock);
|
||||
while (blen < ap->alen) {
|
||||
pag = &mp->m_perag[ag];
|
||||
if (!pag->pagf_init &&
|
||||
(error = xfs_alloc_pagf_init(mp, args.tp,
|
||||
ag, XFS_ALLOC_FLAG_TRYLOCK))) {
|
||||
up_read(&mp->m_peraglock);
|
||||
return error;
|
||||
}
|
||||
} else {
|
||||
args.alignment = 1;
|
||||
args.minalignslop = 0;
|
||||
/*
|
||||
* See xfs_alloc_fix_freelist...
|
||||
*/
|
||||
if (pag->pagf_init) {
|
||||
need = XFS_MIN_FREELIST_PAG(pag, mp);
|
||||
delta = need > pag->pagf_flcount ?
|
||||
need - pag->pagf_flcount : 0;
|
||||
longest = (pag->pagf_longest > delta) ?
|
||||
(pag->pagf_longest - delta) :
|
||||
(pag->pagf_flcount > 0 ||
|
||||
pag->pagf_longest > 0);
|
||||
if (blen < longest)
|
||||
blen = longest;
|
||||
} else
|
||||
notinit = 1;
|
||||
if (++ag == mp->m_sb.sb_agcount)
|
||||
ag = 0;
|
||||
if (ag == startag)
|
||||
break;
|
||||
}
|
||||
args.minleft = ap->minleft;
|
||||
args.wasdel = ap->wasdel;
|
||||
args.isfl = 0;
|
||||
args.userdata = ap->userdata;
|
||||
up_read(&mp->m_peraglock);
|
||||
/*
|
||||
* Since the above loop did a BUF_TRYLOCK, it is
|
||||
* possible that there is space for this request.
|
||||
*/
|
||||
if (notinit || blen < ap->minlen)
|
||||
args.minlen = ap->minlen;
|
||||
/*
|
||||
* If the best seen length is less than the request
|
||||
* length, use the best as the minimum.
|
||||
*/
|
||||
else if (blen < ap->alen)
|
||||
args.minlen = blen;
|
||||
/*
|
||||
* Otherwise we've seen an extent as big as alen,
|
||||
* use that as the minimum.
|
||||
*/
|
||||
else
|
||||
args.minlen = ap->alen;
|
||||
} else if (ap->low) {
|
||||
args.type = XFS_ALLOCTYPE_FIRST_AG;
|
||||
args.total = args.minlen = ap->minlen;
|
||||
} else {
|
||||
args.type = XFS_ALLOCTYPE_NEAR_BNO;
|
||||
args.total = ap->total;
|
||||
args.minlen = ap->minlen;
|
||||
}
|
||||
if (unlikely(ap->userdata && ap->ip->i_d.di_extsize &&
|
||||
(ap->ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE))) {
|
||||
args.prod = ap->ip->i_d.di_extsize;
|
||||
if ((args.mod = (xfs_extlen_t)do_mod(ap->off, args.prod)))
|
||||
args.mod = (xfs_extlen_t)(args.prod - args.mod);
|
||||
} else if (unlikely(mp->m_sb.sb_blocksize >= NBPP)) {
|
||||
args.prod = 1;
|
||||
args.mod = 0;
|
||||
} else {
|
||||
args.prod = NBPP >> mp->m_sb.sb_blocklog;
|
||||
if ((args.mod = (xfs_extlen_t)(do_mod(ap->off, args.prod))))
|
||||
args.mod = (xfs_extlen_t)(args.prod - args.mod);
|
||||
}
|
||||
/*
|
||||
* If we are not low on available data blocks, and the
|
||||
* underlying logical volume manager is a stripe, and
|
||||
* the file offset is zero then try to allocate data
|
||||
* blocks on stripe unit boundary.
|
||||
* NOTE: ap->aeof is only set if the allocation length
|
||||
* is >= the stripe unit and the allocation offset is
|
||||
* at the end of file.
|
||||
*/
|
||||
if (!ap->low && ap->aeof) {
|
||||
if (!ap->off) {
|
||||
args.alignment = mp->m_dalign;
|
||||
atype = args.type;
|
||||
isaligned = 1;
|
||||
/*
|
||||
* Adjust for alignment
|
||||
*/
|
||||
if (blen > args.alignment && blen <= ap->alen)
|
||||
args.minlen = blen - args.alignment;
|
||||
args.minalignslop = 0;
|
||||
} else {
|
||||
/*
|
||||
* First try an exact bno allocation.
|
||||
* If it fails then do a near or start bno
|
||||
* allocation with alignment turned on.
|
||||
*/
|
||||
atype = args.type;
|
||||
tryagain = 1;
|
||||
args.type = XFS_ALLOCTYPE_THIS_BNO;
|
||||
args.alignment = 1;
|
||||
/*
|
||||
* Compute the minlen+alignment for the
|
||||
* next case. Set slop so that the value
|
||||
* of minlen+alignment+slop doesn't go up
|
||||
* between the calls.
|
||||
*/
|
||||
if (blen > mp->m_dalign && blen <= ap->alen)
|
||||
nextminlen = blen - mp->m_dalign;
|
||||
else
|
||||
nextminlen = args.minlen;
|
||||
if (nextminlen + mp->m_dalign > args.minlen + 1)
|
||||
args.minalignslop =
|
||||
nextminlen + mp->m_dalign -
|
||||
args.minlen - 1;
|
||||
else
|
||||
args.minalignslop = 0;
|
||||
}
|
||||
} else {
|
||||
args.alignment = 1;
|
||||
args.minalignslop = 0;
|
||||
}
|
||||
args.minleft = ap->minleft;
|
||||
args.wasdel = ap->wasdel;
|
||||
args.isfl = 0;
|
||||
args.userdata = ap->userdata;
|
||||
if ((error = xfs_alloc_vextent(&args)))
|
||||
return error;
|
||||
if (tryagain && args.fsbno == NULLFSBLOCK) {
|
||||
/*
|
||||
* Exact allocation failed. Now try with alignment
|
||||
* turned on.
|
||||
*/
|
||||
args.type = atype;
|
||||
args.fsbno = ap->rval;
|
||||
args.alignment = mp->m_dalign;
|
||||
args.minlen = nextminlen;
|
||||
args.minalignslop = 0;
|
||||
isaligned = 1;
|
||||
if ((error = xfs_alloc_vextent(&args)))
|
||||
return error;
|
||||
if (tryagain && args.fsbno == NULLFSBLOCK) {
|
||||
/*
|
||||
* Exact allocation failed. Now try with alignment
|
||||
* turned on.
|
||||
*/
|
||||
args.type = atype;
|
||||
args.fsbno = ap->rval;
|
||||
args.alignment = mp->m_dalign;
|
||||
args.minlen = nextminlen;
|
||||
args.minalignslop = 0;
|
||||
isaligned = 1;
|
||||
if ((error = xfs_alloc_vextent(&args)))
|
||||
return error;
|
||||
}
|
||||
if (isaligned && args.fsbno == NULLFSBLOCK) {
|
||||
/*
|
||||
* allocation failed, so turn off alignment and
|
||||
* try again.
|
||||
*/
|
||||
args.type = atype;
|
||||
args.fsbno = ap->rval;
|
||||
args.alignment = 0;
|
||||
if ((error = xfs_alloc_vextent(&args)))
|
||||
return error;
|
||||
}
|
||||
if (args.fsbno == NULLFSBLOCK && nullfb &&
|
||||
args.minlen > ap->minlen) {
|
||||
args.minlen = ap->minlen;
|
||||
args.type = XFS_ALLOCTYPE_START_BNO;
|
||||
args.fsbno = ap->rval;
|
||||
if ((error = xfs_alloc_vextent(&args)))
|
||||
return error;
|
||||
}
|
||||
if (args.fsbno == NULLFSBLOCK && nullfb) {
|
||||
args.fsbno = 0;
|
||||
args.type = XFS_ALLOCTYPE_FIRST_AG;
|
||||
args.total = ap->minlen;
|
||||
args.minleft = 0;
|
||||
if ((error = xfs_alloc_vextent(&args)))
|
||||
return error;
|
||||
ap->low = 1;
|
||||
}
|
||||
if (args.fsbno != NULLFSBLOCK) {
|
||||
ap->firstblock = ap->rval = args.fsbno;
|
||||
ASSERT(nullfb || fb_agno == args.agno ||
|
||||
(ap->low && fb_agno < args.agno));
|
||||
ap->alen = args.len;
|
||||
ap->ip->i_d.di_nblocks += args.len;
|
||||
xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
|
||||
if (ap->wasdel)
|
||||
ap->ip->i_delayed_blks -= args.len;
|
||||
/*
|
||||
* Adjust the disk quota also. This was reserved
|
||||
* earlier.
|
||||
*/
|
||||
XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
|
||||
ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
|
||||
XFS_TRANS_DQ_BCOUNT,
|
||||
(long) args.len);
|
||||
} else {
|
||||
ap->rval = NULLFSBLOCK;
|
||||
ap->alen = 0;
|
||||
}
|
||||
}
|
||||
if (isaligned && args.fsbno == NULLFSBLOCK) {
|
||||
/*
|
||||
* allocation failed, so turn off alignment and
|
||||
* try again.
|
||||
*/
|
||||
args.type = atype;
|
||||
args.fsbno = ap->rval;
|
||||
args.alignment = 0;
|
||||
if ((error = xfs_alloc_vextent(&args)))
|
||||
return error;
|
||||
}
|
||||
if (args.fsbno == NULLFSBLOCK && nullfb &&
|
||||
args.minlen > ap->minlen) {
|
||||
args.minlen = ap->minlen;
|
||||
args.type = XFS_ALLOCTYPE_START_BNO;
|
||||
args.fsbno = ap->rval;
|
||||
if ((error = xfs_alloc_vextent(&args)))
|
||||
return error;
|
||||
}
|
||||
if (args.fsbno == NULLFSBLOCK && nullfb) {
|
||||
args.fsbno = 0;
|
||||
args.type = XFS_ALLOCTYPE_FIRST_AG;
|
||||
args.total = ap->minlen;
|
||||
args.minleft = 0;
|
||||
if ((error = xfs_alloc_vextent(&args)))
|
||||
return error;
|
||||
ap->low = 1;
|
||||
}
|
||||
if (args.fsbno != NULLFSBLOCK) {
|
||||
ap->firstblock = ap->rval = args.fsbno;
|
||||
ASSERT(nullfb || fb_agno == args.agno ||
|
||||
(ap->low && fb_agno < args.agno));
|
||||
ap->alen = args.len;
|
||||
ap->ip->i_d.di_nblocks += args.len;
|
||||
xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
|
||||
if (ap->wasdel)
|
||||
ap->ip->i_delayed_blks -= args.len;
|
||||
/*
|
||||
* Adjust the disk quota also. This was reserved
|
||||
* earlier.
|
||||
*/
|
||||
XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
|
||||
ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
|
||||
XFS_TRANS_DQ_BCOUNT,
|
||||
(long) args.len);
|
||||
} else {
|
||||
ap->rval = NULLFSBLOCK;
|
||||
ap->alen = 0;
|
||||
}
|
||||
return 0;
|
||||
#undef ISVALID
|
||||
}
|
||||
|
||||
/*
|
||||
* xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
|
||||
* It figures out where to ask the underlying allocator to put the new extent.
|
||||
*/
|
||||
STATIC int
|
||||
xfs_bmap_alloc(
|
||||
xfs_bmalloca_t *ap) /* bmap alloc argument struct */
|
||||
{
|
||||
if ((ap->ip->i_d.di_flags & XFS_DIFLAG_REALTIME) && ap->userdata)
|
||||
return xfs_bmap_rtalloc(ap);
|
||||
return xfs_bmap_btalloc(ap);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
|
|||
Loading…
Reference in New Issue