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mm: add page_cache_readahead_unbounded

Ver a proveniência 
ext4 and f2fs have duplicated the guts of the readahead code so they can
read past i_size.  Instead, separate out the guts of the readahead code
so they can call it directly.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Cc: Chao Yu <yuchao0@huawei.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Gao Xiang <gaoxiang25@huawei.com>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Link: http://lkml.kernel.org/r/20200414150233.24495-14-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Este cometimento está contido em:
Matthew Wilcox (Oracle)
2020-06-01 21:46:51 -07:00
cometido por Linus Torvalds
ascendente b0f31d78cb
cometimento 2c684234d3
6 ficheiros modificados com 55 adições e 91 eliminações
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35
fs/ext4/verity.c
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@@ -342,37 +342,6 @@ static int ext4_get_verity_descriptor(struct inode *inode, void *buf,
return desc_size;
}
/*
* Prefetch some pages from the file's Merkle tree.
*
* This is basically a stripped-down version of __do_page_cache_readahead()
* which works on pages past i_size.
*/
static void ext4_merkle_tree_readahead(struct address_space *mapping,
pgoff_t start_index, unsigned long count)
{
LIST_HEAD(pages);
unsigned int nr_pages = 0;
struct page *page;
pgoff_t index;
struct blk_plug plug;
for (index = start_index; index < start_index + count; index++) {
page = xa_load(&mapping->i_pages, index);
if (!page || xa_is_value(page)) {
page = __page_cache_alloc(readahead_gfp_mask(mapping));
if (!page)
break;
page->index = index;
list_add(&page->lru, &pages);
nr_pages++;
}
}
blk_start_plug(&plug);
ext4_mpage_readpages(mapping, &pages, NULL, nr_pages, true);
blk_finish_plug(&plug);
}
static struct page *ext4_read_merkle_tree_page(struct inode *inode,
pgoff_t index,
unsigned long num_ra_pages)
@@ -386,8 +355,8 @@ static struct page *ext4_read_merkle_tree_page(struct inode *inode,
if (page)
put_page(page);
else if (num_ra_pages > 1)
ext4_merkle_tree_readahead(inode->i_mapping, index,
num_ra_pages);
page_cache_readahead_unbounded(inode->i_mapping, NULL,
index, num_ra_pages, 0);
page = read_mapping_page(inode->i_mapping, index, NULL);
}
return page;