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f2fs: no need to take page lock in readdir 

VFS will take inode_lock for readdir, therefore no need to
take page lock in readdir at all just as the majority of
other generic filesystems.

This patch improves concurrency since .iterate_shared
was introduced to VFS years ago.

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Gao Xiang 2019-02-21 12:57:35 +08:00 committed by Jaegeuk Kim
parent e46f6bd82c
commit 613f3dcdf0
1 changed files with 3 additions and 3 deletions
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6
fs/f2fs/dir.c
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@ -896,7 +896,7 @@ static int f2fs_readdir(struct file *file, struct dir_context *ctx)
page_cache_sync_readahead(inode->i_mapping, ra, file, n,
min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
dentry_page = f2fs_get_lock_data_page(inode, n, false);
dentry_page = f2fs_find_data_page(inode, n);
if (IS_ERR(dentry_page)) {
err = PTR_ERR(dentry_page);
if (err == -ENOENT) {
@ -914,11 +914,11 @@ static int f2fs_readdir(struct file *file, struct dir_context *ctx)
err = f2fs_fill_dentries(ctx, &d,
n * NR_DENTRY_IN_BLOCK, &fstr);
if (err) {
f2fs_put_page(dentry_page, 1);
f2fs_put_page(dentry_page, 0);
break;
}
f2fs_put_page(dentry_page, 1);
f2fs_put_page(dentry_page, 0);
}
out_free:
fscrypt_fname_free_buffer(&fstr);