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readahead: drop pointless index from force_page_cache_ra()

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Current index to readahead is tracked in readahead_control and properly
updated by page_cache_ra_unbounded() (read_pages() in fact).  So there's
no need to track the index separately in force_page_cache_ra().

Link: https://lkml.kernel.org/r/20240625101909.12234-4-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Tested-by: Zhang Peng <zhangpengpeng0808@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jan Kara 2024-06-25 12:18:54 +02:00 committed by Andrew Morton
parent 7c877586da
commit 878343dfa4
1 changed files with 1 additions and 4 deletions
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5
mm/readahead.c
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@ -313,7 +313,7 @@ void force_page_cache_ra(struct readahead_control *ractl,
struct address_space *mapping = ractl->mapping;
struct file_ra_state *ra = ractl->ra;
struct backing_dev_info *bdi = inode_to_bdi(mapping->host);
unsigned long max_pages, index;
unsigned long max_pages;
if (unlikely(!mapping->a_ops->read_folio && !mapping->a_ops->readahead))
return;
@ -322,7 +322,6 @@ void force_page_cache_ra(struct readahead_control *ractl,
* If the request exceeds the readahead window, allow the read to
* be up to the optimal hardware IO size
*/
index = readahead_index(ractl);
max_pages = max_t(unsigned long, bdi->io_pages, ra->ra_pages);
nr_to_read = min_t(unsigned long, nr_to_read, max_pages);
while (nr_to_read) {
@ -330,10 +329,8 @@ void force_page_cache_ra(struct readahead_control *ractl,
if (this_chunk > nr_to_read)
this_chunk = nr_to_read;
ractl->_index = index;
do_page_cache_ra(ractl, this_chunk, 0);
index += this_chunk;
nr_to_read -= this_chunk;
}
}