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[PATCH] readahead commentary

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Add a few comments surrounding the generic readahead API.

Also convert some ulongs into pgoff_t: the identifier for PAGE_CACHE_SIZE
offsets into pagecache.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andrew Morton 2005-11-07 00:59:28 -08:00 • committed by Linus Torvalds
parent bf8f972d3a
commit 7361f4d8ca
2 changed files with 26 additions and 13 deletions
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8
include/linux/mm.h
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@ -932,13 +932,13 @@ int write_one_page(struct page *page, int wait);
* turning readahead off */
int do_page_cache_readahead(struct address_space *mapping, struct file *filp,
unsigned long offset, unsigned long nr_to_read);
pgoff_t offset, unsigned long nr_to_read);
int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
unsigned long offset, unsigned long nr_to_read);
unsigned long page_cache_readahead(struct address_space *mapping,
pgoff_t offset, unsigned long nr_to_read);
unsigned long page_cache_readahead(struct address_space *mapping,
struct file_ra_state *ra,
struct file *filp,
unsigned long offset,
pgoff_t offset,
unsigned long size);
void handle_ra_miss(struct address_space *mapping,
struct file_ra_state *ra, pgoff_t offset);