diff options
Diffstat (limited to 'fs/xfs/kmem.c')
-rw-r--r-- | fs/xfs/kmem.c | 79 |
1 files changed, 59 insertions, 20 deletions
diff --git a/fs/xfs/kmem.c b/fs/xfs/kmem.c index 16bb9a328678..da031b93e182 100644 --- a/fs/xfs/kmem.c +++ b/fs/xfs/kmem.c @@ -3,10 +3,10 @@ * Copyright (c) 2000-2005 Silicon Graphics, Inc. * All Rights Reserved. */ -#include <linux/sched/mm.h> +#include "xfs.h" #include <linux/backing-dev.h> -#include "kmem.h" #include "xfs_message.h" +#include "xfs_trace.h" void * kmem_alloc(size_t size, xfs_km_flags_t flags) @@ -15,9 +15,11 @@ kmem_alloc(size_t size, xfs_km_flags_t flags) gfp_t lflags = kmem_flags_convert(flags); void *ptr; + trace_kmem_alloc(size, flags, _RET_IP_); + do { ptr = kmalloc(size, lflags); - if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) + if (ptr || (flags & KM_MAYFAIL)) return ptr; if (!(++retries % 100)) xfs_err(NULL, @@ -28,28 +30,24 @@ kmem_alloc(size_t size, xfs_km_flags_t flags) } while (1); } -void * -kmem_alloc_large(size_t size, xfs_km_flags_t flags) + +/* + * __vmalloc() will allocate data pages and auxillary structures (e.g. + * pagetables) with GFP_KERNEL, yet we may be under GFP_NOFS context here. Hence + * we need to tell memory reclaim that we are in such a context via + * PF_MEMALLOC_NOFS to prevent memory reclaim re-entering the filesystem here + * and potentially deadlocking. + */ +static void * +__kmem_vmalloc(size_t size, xfs_km_flags_t flags) { unsigned nofs_flag = 0; void *ptr; - gfp_t lflags; - - ptr = kmem_alloc(size, flags | KM_MAYFAIL); - if (ptr) - return ptr; + gfp_t lflags = kmem_flags_convert(flags); - /* - * __vmalloc() will allocate data pages and auxillary structures (e.g. - * pagetables) with GFP_KERNEL, yet we may be under GFP_NOFS context - * here. Hence we need to tell memory reclaim that we are in such a - * context via PF_MEMALLOC_NOFS to prevent memory reclaim re-entering - * the filesystem here and potentially deadlocking. - */ if (flags & KM_NOFS) nofs_flag = memalloc_nofs_save(); - lflags = kmem_flags_convert(flags); ptr = __vmalloc(size, lflags, PAGE_KERNEL); if (flags & KM_NOFS) @@ -58,6 +56,44 @@ kmem_alloc_large(size_t size, xfs_km_flags_t flags) return ptr; } +/* + * Same as kmem_alloc_large, except we guarantee the buffer returned is aligned + * to the @align_mask. We only guarantee alignment up to page size, we'll clamp + * alignment at page size if it is larger. vmalloc always returns a PAGE_SIZE + * aligned region. + */ +void * +kmem_alloc_io(size_t size, int align_mask, xfs_km_flags_t flags) +{ + void *ptr; + + trace_kmem_alloc_io(size, flags, _RET_IP_); + + if (WARN_ON_ONCE(align_mask >= PAGE_SIZE)) + align_mask = PAGE_SIZE - 1; + + ptr = kmem_alloc(size, flags | KM_MAYFAIL); + if (ptr) { + if (!((uintptr_t)ptr & align_mask)) + return ptr; + kfree(ptr); + } + return __kmem_vmalloc(size, flags); +} + +void * +kmem_alloc_large(size_t size, xfs_km_flags_t flags) +{ + void *ptr; + + trace_kmem_alloc_large(size, flags, _RET_IP_); + + ptr = kmem_alloc(size, flags | KM_MAYFAIL); + if (ptr) + return ptr; + return __kmem_vmalloc(size, flags); +} + void * kmem_realloc(const void *old, size_t newsize, xfs_km_flags_t flags) { @@ -65,9 +101,11 @@ kmem_realloc(const void *old, size_t newsize, xfs_km_flags_t flags) gfp_t lflags = kmem_flags_convert(flags); void *ptr; + trace_kmem_realloc(newsize, flags, _RET_IP_); + do { ptr = krealloc(old, newsize, lflags); - if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) + if (ptr || (flags & KM_MAYFAIL)) return ptr; if (!(++retries % 100)) xfs_err(NULL, @@ -85,9 +123,10 @@ kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t flags) gfp_t lflags = kmem_flags_convert(flags); void *ptr; + trace_kmem_zone_alloc(kmem_cache_size(zone), flags, _RET_IP_); do { ptr = kmem_cache_alloc(zone, lflags); - if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) + if (ptr || (flags & KM_MAYFAIL)) return ptr; if (!(++retries % 100)) xfs_err(NULL, |