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mm: optimize readahead for the file with fscrypt

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For files with fscrypt enabled, to allow IO and the encryption
or decryption process to ping-pong, lookahead is forcibly enabled.

Change-Id: I137b8439dcd1fd99052bef1d1b0526af0d4a611e
Signed-off-by: Cliff Chen <cmc@rock-chips.com>
This commit is contained in:
Cliff Chen
2023-05-25 10:14:23 +08:00
committed by Tao Huang
parent 2f2ba4a8f8
commit c73d891d8e
1 changed files with 21 additions and 0 deletions
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21
mm/readahead.c
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@@ -27,6 +27,10 @@
#include "internal.h"
#ifdef CONFIG_ARCH_ROCKCHIP
#include <linux/fscrypt.h>
#endif
/*
* Initialise a struct file's readahead state. Assumes that the caller has
* memset *ra to zero.
@@ -287,6 +291,9 @@ void force_page_cache_ra(struct readahead_control *ractl,
struct address_space *mapping = ractl->mapping;
struct backing_dev_info *bdi = inode_to_bdi(mapping->host);
unsigned long max_pages, index;
#ifdef CONFIG_ARCH_ROCKCHIP
bool force_lookahead = false;
#endif
if (unlikely(!mapping->a_ops->readpage && !mapping->a_ops->readpages &&
!mapping->a_ops->readahead))
@@ -298,6 +305,13 @@ void force_page_cache_ra(struct readahead_control *ractl,
*/
index = readahead_index(ractl);
max_pages = max_t(unsigned long, bdi->io_pages, ra->ra_pages);
#ifdef CONFIG_ARCH_ROCKCHIP
/* For files with fscrypt enabled, to allow IO and the encryption
* or decryption process to ping-pong, lookahead is forcibly enabled.
*/
if (nr_to_read > max_pages && fscrypt_inode_uses_fs_layer_crypto(mapping->host))
force_lookahead = true;
#endif
nr_to_read = min_t(unsigned long, nr_to_read, max_pages);
while (nr_to_read) {
unsigned long this_chunk = (2 * 1024 * 1024) / PAGE_SIZE;
@@ -305,7 +319,14 @@ void force_page_cache_ra(struct readahead_control *ractl,
if (this_chunk > nr_to_read)
this_chunk = nr_to_read;
ractl->_index = index;
#ifdef CONFIG_ARCH_ROCKCHIP
if (force_lookahead)
do_page_cache_ra(ractl, this_chunk, this_chunk / 2);
else
do_page_cache_ra(ractl, this_chunk, 0);
#else
do_page_cache_ra(ractl, this_chunk, 0);
#endif
index += this_chunk;
nr_to_read -= this_chunk;