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xfs: Convert filestreams code to use per-ag get/put routines 

Use xfs_perag_get() and xfs_perag_put() in the filestreams code.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner 2010-01-11 11:47:42 +00:00 committed by Alex Elder
parent a862e0fdcb
commit 4196ac08c0
2 changed files with 36 additions and 10 deletions
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19
fs/xfs/xfs_filestream.c
View File

@ -140,6 +140,7 @@ _xfs_filestream_pick_ag(
int flags,
xfs_extlen_t minlen)
{
int streams, max_streams;
int err, trylock, nscan;
xfs_extlen_t longest, free, minfree, maxfree = 0;
xfs_agnumber_t ag, max_ag = NULLAGNUMBER;
@ -155,15 +156,15 @@ _xfs_filestream_pick_ag(
trylock = XFS_ALLOC_FLAG_TRYLOCK;
for (nscan = 0; 1; nscan++) {
TRACE_AG_SCAN(mp, ag, xfs_filestream_peek_ag(mp, ag));
pag = mp->m_perag + ag;
pag = xfs_perag_get(mp, ag);
TRACE_AG_SCAN(mp, ag, atomic_read(&pag->pagf_fstrms));
if (!pag->pagf_init) {
err = xfs_alloc_pagf_init(mp, NULL, ag, trylock);
if (err && !trylock)
if (err && !trylock) {
xfs_perag_put(pag);
return err;
}
}
/* Might fail sometimes during the 1st pass with trylock set. */
@ -173,6 +174,7 @@ _xfs_filestream_pick_ag(
/* Keep track of the AG with the most free blocks. */
if (pag->pagf_freeblks > maxfree) {
maxfree = pag->pagf_freeblks;
max_streams = atomic_read(&pag->pagf_fstrms);
max_ag = ag;
}
@ -195,6 +197,8 @@ _xfs_filestream_pick_ag(
/* Break out, retaining the reference on the AG. */
free = pag->pagf_freeblks;
streams = atomic_read(&pag->pagf_fstrms);
xfs_perag_put(pag);
*agp = ag;
break;
}
@ -202,6 +206,7 @@ _xfs_filestream_pick_ag(
/* Drop the reference on this AG, it's not usable. */
xfs_filestream_put_ag(mp, ag);
next_ag:
xfs_perag_put(pag);
/* Move to the next AG, wrapping to AG 0 if necessary. */
if (++ag >= mp->m_sb.sb_agcount)
ag = 0;
@ -229,6 +234,7 @@ next_ag:
if (max_ag != NULLAGNUMBER) {
xfs_filestream_get_ag(mp, max_ag);
TRACE_AG_PICK1(mp, max_ag, maxfree);
streams = max_streams;
free = maxfree;
*agp = max_ag;
break;
@ -240,8 +246,7 @@ next_ag:
return 0;
}
TRACE_AG_PICK2(mp, startag, *agp, xfs_filestream_peek_ag(mp, *agp),
free, nscan, flags);
TRACE_AG_PICK2(mp, startag, *agp, streams, free, nscan, flags);
return 0;
}

27
fs/xfs/xfs_filestream.h
View File

@ -79,12 +79,21 @@ extern ktrace_t *xfs_filestreams_trace_buf;
* the cache that reference per-ag array elements that have since been
* reallocated.
*/
/*
* xfs_filestream_peek_ag is only used in tracing code
*/
static inline int
xfs_filestream_peek_ag(
xfs_mount_t *mp,
xfs_agnumber_t agno)
{
return atomic_read(&mp->m_perag[agno].pagf_fstrms);
struct xfs_perag *pag;
int ret;
pag = xfs_perag_get(mp, agno);
ret = atomic_read(&pag->pagf_fstrms);
xfs_perag_put(pag);
return ret;
}
static inline int
@ -92,7 +101,13 @@ xfs_filestream_get_ag(
xfs_mount_t *mp,
xfs_agnumber_t agno)
{
return atomic_inc_return(&mp->m_perag[agno].pagf_fstrms);
struct xfs_perag *pag;
int ret;
pag = xfs_perag_get(mp, agno);
ret = atomic_inc_return(&pag->pagf_fstrms);
xfs_perag_put(pag);
return ret;
}
static inline int
@ -100,7 +115,13 @@ xfs_filestream_put_ag(
xfs_mount_t *mp,
xfs_agnumber_t agno)
{
return atomic_dec_return(&mp->m_perag[agno].pagf_fstrms);
struct xfs_perag *pag;
int ret;
pag = xfs_perag_get(mp, agno);
ret = atomic_dec_return(&pag->pagf_fstrms);
xfs_perag_put(pag);
return ret;
}
/* allocation selection flags */