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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2017-03-06 11:58:20 -0800 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2017-03-07 20:10:50 -0800 |
| commit | 08b005f1333154ae5b404ca28766e0ffb9f1c150 (patch) | |
| tree | 5179a760a440e2a62b4058b8811200234cd3c934 /fs | |
| parent | d5825712ee98d68a2c17bc89dad2c30276894cba (diff) | |
| download | lwn-08b005f1333154ae5b404ca28766e0ffb9f1c150.tar.gz lwn-08b005f1333154ae5b404ca28766e0ffb9f1c150.zip | |
xfs: remove kmem_zalloc_greedy
The sole remaining caller of kmem_zalloc_greedy is bulkstat, which uses
it to grab 1-4 pages for staging of inobt records. The infinite loop in
the greedy allocation function is causing hangs[1] in generic/269, so
just get rid of the greedy allocator in favor of kmem_zalloc_large.
This makes bulkstat somewhat more likely to ENOMEM if there's really no
pages to spare, but eliminates a source of hangs.
[1] http://lkml.kernel.org/r/20170301044634.rgidgdqqiiwsmfpj%40XZHOUW.usersys.redhat.com
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
v2: remove single-page fallback
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/xfs/kmem.c | 18 | ||||
| -rw-r--r-- | fs/xfs/kmem.h | 2 | ||||
| -rw-r--r-- | fs/xfs/xfs_itable.c | 6 |
3 files changed, 2 insertions, 24 deletions
diff --git a/fs/xfs/kmem.c b/fs/xfs/kmem.c index 2dfdc62f795e..70a5b55e0870 100644 --- a/fs/xfs/kmem.c +++ b/fs/xfs/kmem.c @@ -25,24 +25,6 @@ #include "kmem.h" #include "xfs_message.h" -/* - * Greedy allocation. May fail and may return vmalloced memory. - */ -void * -kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize) -{ - void *ptr; - size_t kmsize = maxsize; - - while (!(ptr = vzalloc(kmsize))) { - if ((kmsize >>= 1) <= minsize) - kmsize = minsize; - } - if (ptr) - *size = kmsize; - return ptr; -} - void * kmem_alloc(size_t size, xfs_km_flags_t flags) { diff --git a/fs/xfs/kmem.h b/fs/xfs/kmem.h index 689f746224e7..f0fc84fcaac2 100644 --- a/fs/xfs/kmem.h +++ b/fs/xfs/kmem.h @@ -69,8 +69,6 @@ static inline void kmem_free(const void *ptr) } -extern void *kmem_zalloc_greedy(size_t *, size_t, size_t); - static inline void * kmem_zalloc(size_t size, xfs_km_flags_t flags) { diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c index 66e881790c17..2a6d9b1558e0 100644 --- a/fs/xfs/xfs_itable.c +++ b/fs/xfs/xfs_itable.c @@ -361,7 +361,6 @@ xfs_bulkstat( xfs_agino_t agino; /* inode # in allocation group */ xfs_agnumber_t agno; /* allocation group number */ xfs_btree_cur_t *cur; /* btree cursor for ialloc btree */ - size_t irbsize; /* size of irec buffer in bytes */ xfs_inobt_rec_incore_t *irbuf; /* start of irec buffer */ int nirbuf; /* size of irbuf */ int ubcount; /* size of user's buffer */ @@ -388,11 +387,10 @@ xfs_bulkstat( *ubcountp = 0; *done = 0; - irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4); + irbuf = kmem_zalloc_large(PAGE_SIZE * 4, KM_SLEEP); if (!irbuf) return -ENOMEM; - - nirbuf = irbsize / sizeof(*irbuf); + nirbuf = (PAGE_SIZE * 4) / sizeof(*irbuf); /* * Loop over the allocation groups, starting from the last |