diff options
| author | David Howells <dhowells@redhat.com> | 2020-10-15 20:06:21 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-16 11:11:16 -0700 |
| commit | 6e4af69ae9b7ca1bc2f82d3bf061ef8abedeabc4 (patch) | |
| tree | a048fae2233ed7582095148b3a8d4e1901e60f27 /mm/readahead.c | |
| parent | 8238287eadb2ddaedd920ba06021c33ec36d0320 (diff) | |
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>
Diffstat (limited to 'mm/readahead.c')
| -rw-r--r-- | mm/readahead.c | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/mm/readahead.c b/mm/readahead.c index 577f180d9252..73110c4148f8 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -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); |