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Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

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* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  cfq-iosched: limit coop preemption
  cfq-iosched: fix bad return value cfq_should_preempt()
  backing-dev: bdi sb prune should be in the unregister path, not destroy
  Fix bio_alloc() and bio_kmalloc() documentation
  bio_put(): add bio_clone() to the list of functions in the comment
This commit is contained in:
Linus Torvalds
2009-11-03 18:16:21 -08:00
parent dc79d2f21a 4b27e1bb44
commit 51bb296b09
3 changed files with 32 additions and 18 deletions
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28
fs/bio.c
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@@ -325,8 +325,16 @@ static void bio_fs_destructor(struct bio *bio)
* @gfp_mask: allocation mask to use
* @nr_iovecs: number of iovecs
*
* Allocate a new bio with @nr_iovecs bvecs. If @gfp_mask
* contains __GFP_WAIT, the allocation is guaranteed to succeed.
* bio_alloc will allocate a bio and associated bio_vec array that can hold
* at least @nr_iovecs entries. Allocations will be done from the
* fs_bio_set. Also see @bio_alloc_bioset and @bio_kmalloc.
*
* If %__GFP_WAIT is set, then bio_alloc will always be able to allocate
* a bio. This is due to the mempool guarantees. To make this work, callers
* must never allocate more than 1 bio at a time from this pool. Callers
* that need to allocate more than 1 bio must always submit the previously
* allocated bio for IO before attempting to allocate a new one. Failure to
* do so can cause livelocks under memory pressure.
*
* RETURNS:
* Pointer to new bio on success, NULL on failure.
@@ -350,21 +358,13 @@ static void bio_kmalloc_destructor(struct bio *bio)
}
/**
* bio_alloc - allocate a bio for I/O
* bio_kmalloc - allocate a bio for I/O using kmalloc()
* @gfp_mask: the GFP_ mask given to the slab allocator
* @nr_iovecs: number of iovecs to pre-allocate
*
* Description:
* bio_alloc will allocate a bio and associated bio_vec array that can hold
* at least @nr_iovecs entries. Allocations will be done from the
* fs_bio_set. Also see @bio_alloc_bioset.
*
* If %__GFP_WAIT is set, then bio_alloc will always be able to allocate
* a bio. This is due to the mempool guarantees. To make this work, callers
* must never allocate more than 1 bio at a time from this pool. Callers
* that need to allocate more than 1 bio must always submit the previously
* allocated bio for IO before attempting to allocate a new one. Failure to
* do so can cause livelocks under memory pressure.
* Allocate a new bio with @nr_iovecs bvecs. If @gfp_mask contains
* %__GFP_WAIT, the allocation is guaranteed to succeed.
*
**/
struct bio *bio_kmalloc(gfp_t gfp_mask, int nr_iovecs)
@@ -407,7 +407,7 @@ EXPORT_SYMBOL(zero_fill_bio);
*
* Description:
* Put a reference to a &struct bio, either one you have gotten with
* bio_alloc or bio_get. The last put of a bio will free it.
* bio_alloc, bio_get or bio_clone. The last put of a bio will free it.
**/
void bio_put(struct bio *bio)
{