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mm/readahead: make ondemand_readahead take a readahead_control 

Make ondemand_readahead() take a readahead_control struct in preparation
for making do_sync_mmap_readahead() pass down an RAC struct.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Eric Biggers <ebiggers@google.com>
Link: https://lkml.kernel.org/r/20200903140844.14194-6-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells 2020-10-15 20:06:21 -07:00 committed by Linus Torvalds
parent 8238287ead
commit 6e4af69ae9
1 changed files with 17 additions and 12 deletions
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29
mm/readahead.c
View File

@ -431,15 +431,14 @@ static int try_context_readahead(struct address_space *mapping,
/*
* A minimal readahead algorithm for trivial sequential/random reads.
*/
static void ondemand_readahead(struct address_space *mapping,
struct file_ra_state *ra, struct file *file,
bool hit_readahead_marker, pgoff_t index,
static void ondemand_readahead(struct readahead_control *ractl,
struct file_ra_state *ra, bool hit_readahead_marker,
unsigned long req_size)
{
DEFINE_READAHEAD(ractl, file, mapping, index);
struct backing_dev_info *bdi = inode_to_bdi(mapping->host);
struct backing_dev_info *bdi = inode_to_bdi(ractl->mapping->host);
unsigned long max_pages = ra->ra_pages;
unsigned long add_pages;
unsigned long index = readahead_index(ractl);
pgoff_t prev_index;
/*
@ -477,7 +476,8 @@ static void ondemand_readahead(struct address_space *mapping,
pgoff_t start;
rcu_read_lock();
start = page_cache_next_miss(mapping, index + 1, max_pages);
start = page_cache_next_miss(ractl->mapping, index + 1,
max_pages);
rcu_read_unlock();
if (!start || start - index > max_pages)
@ -510,14 +510,15 @@ static void ondemand_readahead(struct address_space *mapping,
* Query the page cache and look for the traces(cached history pages)
* that a sequential stream would leave behind.
*/
if (try_context_readahead(mapping, ra, index, req_size, max_pages))
if (try_context_readahead(ractl->mapping, ra, index, req_size,
max_pages))
goto readit;
/*
* standalone, small random read
* Read as is, and do not pollute the readahead state.
*/
do_page_cache_ra(&ractl, req_size, 0);
do_page_cache_ra(ractl, req_size, 0);
return;
initial_readahead:
@ -543,8 +544,8 @@ readit:
}
}
ractl._index = ra->start;
do_page_cache_ra(&ractl, ra->size, ra->async_size);
ractl->_index = ra->start;
do_page_cache_ra(ractl, ra->size, ra->async_size);
}
/**
@ -564,6 +565,8 @@ void page_cache_sync_readahead(struct address_space *mapping,
struct file_ra_state *ra, struct file *filp,
pgoff_t index, unsigned long req_count)
{
DEFINE_READAHEAD(ractl, filp, mapping, index);
/* no read-ahead */
if (!ra->ra_pages)
return;
@ -578,7 +581,7 @@ void page_cache_sync_readahead(struct address_space *mapping,
}
/* do read-ahead */
ondemand_readahead(mapping, ra, filp, false, index, req_count);
ondemand_readahead(&ractl, ra, false, req_count);
}
EXPORT_SYMBOL_GPL(page_cache_sync_readahead);
@ -602,6 +605,8 @@ page_cache_async_readahead(struct address_space *mapping,
struct page *page, pgoff_t index,
unsigned long req_count)
{
DEFINE_READAHEAD(ractl, filp, mapping, index);
/* no read-ahead */
if (!ra->ra_pages)
return;
@ -624,7 +629,7 @@ page_cache_async_readahead(struct address_space *mapping,
return;
/* do read-ahead */
ondemand_readahead(mapping, ra, filp, true, index, req_count);
ondemand_readahead(&ractl, ra, true, req_count);
}
EXPORT_SYMBOL_GPL(page_cache_async_readahead);