提交 6cc87645 编写于 作者: D Dave Chinner 提交者: Christoph Hellwig

xfs: factor out code to find the longest free extent in the AG

Signed-off-by: NDave Chinner <dgc@sgi.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
上级 cb4c8cc1
......@@ -1871,6 +1871,25 @@ xfs_alloc_compute_maxlevels(
mp->m_ag_maxlevels = level;
}
/*
* Find the length of the longest extent in an AG.
*/
xfs_extlen_t
xfs_alloc_longest_free_extent(
struct xfs_mount *mp,
struct xfs_perag *pag)
{
xfs_extlen_t need, delta = 0;
need = XFS_MIN_FREELIST_PAG(pag, mp);
if (need > pag->pagf_flcount)
delta = need - pag->pagf_flcount;
if (pag->pagf_longest > delta)
return pag->pagf_longest - delta;
return pag->pagf_flcount > 0 || pag->pagf_longest > 0;
}
/*
* Decide whether to use this allocation group for this allocation.
* If so, fix up the btree freelist's size.
......@@ -1923,15 +1942,12 @@ xfs_alloc_fix_freelist(
}
if (!(flags & XFS_ALLOC_FLAG_FREEING)) {
need = XFS_MIN_FREELIST_PAG(pag, mp);
delta = need > pag->pagf_flcount ? need - pag->pagf_flcount : 0;
/*
* If it looks like there isn't a long enough extent, or enough
* total blocks, reject it.
*/
longest = (pag->pagf_longest > delta) ?
(pag->pagf_longest - delta) :
(pag->pagf_flcount > 0 || pag->pagf_longest > 0);
need = XFS_MIN_FREELIST_PAG(pag, mp);
longest = xfs_alloc_longest_free_extent(mp, pag);
if ((args->minlen + args->alignment + args->minalignslop - 1) >
longest ||
((int)(pag->pagf_freeblks + pag->pagf_flcount -
......
......@@ -100,6 +100,12 @@ typedef struct xfs_alloc_arg {
#define XFS_ALLOC_USERDATA 1 /* allocation is for user data*/
#define XFS_ALLOC_INITIAL_USER_DATA 2 /* special case start of file */
/*
* Find the length of the longest extent in an AG.
*/
xfs_extlen_t
xfs_alloc_longest_free_extent(struct xfs_mount *mp,
struct xfs_perag *pag);
#ifdef __KERNEL__
......
......@@ -2712,9 +2712,6 @@ xfs_bmap_btalloc(
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 */
......@@ -2796,13 +2793,8 @@ xfs_bmap_btalloc(
* 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);
xfs_extlen_t longest;
longest = xfs_alloc_longest_free_extent(mp, pag);
if (blen < longest)
blen = longest;
} else
......
......@@ -140,7 +140,7 @@ _xfs_filestream_pick_ag(
xfs_extlen_t minlen)
{
int err, trylock, nscan;
xfs_extlen_t delta, longest, need, free, minfree, maxfree = 0;
xfs_extlen_t longest, free, minfree, maxfree = 0;
xfs_agnumber_t ag, max_ag = NULLAGNUMBER;
struct xfs_perag *pag;
......@@ -186,12 +186,7 @@ _xfs_filestream_pick_ag(
goto next_ag;
}
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);
longest = xfs_alloc_longest_free_extent(mp, pag);
if (((minlen && longest >= minlen) ||
(!minlen && pag->pagf_freeblks >= minfree)) &&
(!pag->pagf_metadata || !(flags & XFS_PICK_USERDATA) ||
......
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