mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 10:40:15 +02:00
4ec373b74e
All callers now have a folio. Pass it to page_put_link(), saving a hidden call to compound_head(). Also add kernel-doc for page_get_link() and page_put_link(). Signed-off-by: "Matthew Wilcox (Oracle)" <willy@infradead.org> Link: https://lore.kernel.org/20250514171316.3002934-4-willy@infradead.org Signed-off-by: Christian Brauner <brauner@kernel.org>
77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* linux/fs/nfs/symlink.c
|
|
*
|
|
* Copyright (C) 1992 Rick Sladkey
|
|
*
|
|
* Optimization changes Copyright (C) 1994 Florian La Roche
|
|
*
|
|
* Jun 7 1999, cache symlink lookups in the page cache. -DaveM
|
|
*
|
|
* nfs symlink handling code
|
|
*/
|
|
|
|
#include <linux/time.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/sunrpc/clnt.h>
|
|
#include <linux/nfs.h>
|
|
#include <linux/nfs2.h>
|
|
#include <linux/nfs_fs.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/string.h>
|
|
|
|
/* Symlink caching in the page cache is even more simplistic
|
|
* and straight-forward than readdir caching.
|
|
*/
|
|
|
|
static int nfs_symlink_filler(struct file *file, struct folio *folio)
|
|
{
|
|
struct inode *inode = folio->mapping->host;
|
|
int error;
|
|
|
|
error = NFS_PROTO(inode)->readlink(inode, &folio->page, 0, PAGE_SIZE);
|
|
folio_end_read(folio, error == 0);
|
|
return error;
|
|
}
|
|
|
|
static const char *nfs_get_link(struct dentry *dentry,
|
|
struct inode *inode,
|
|
struct delayed_call *done)
|
|
{
|
|
struct folio *folio;
|
|
void *err;
|
|
|
|
if (!dentry) {
|
|
err = ERR_PTR(nfs_revalidate_mapping_rcu(inode));
|
|
if (err)
|
|
return err;
|
|
folio = filemap_get_folio(inode->i_mapping, 0);
|
|
if (IS_ERR(folio))
|
|
return ERR_PTR(-ECHILD);
|
|
if (!folio_test_uptodate(folio)) {
|
|
folio_put(folio);
|
|
return ERR_PTR(-ECHILD);
|
|
}
|
|
} else {
|
|
err = ERR_PTR(nfs_revalidate_mapping(inode, inode->i_mapping));
|
|
if (err)
|
|
return err;
|
|
folio = read_cache_folio(&inode->i_data, 0, nfs_symlink_filler,
|
|
NULL);
|
|
if (IS_ERR(folio))
|
|
return ERR_CAST(folio);
|
|
}
|
|
set_delayed_call(done, page_put_link, folio);
|
|
return folio_address(folio);
|
|
}
|
|
|
|
/*
|
|
* symlinks can't do much...
|
|
*/
|
|
const struct inode_operations nfs_symlink_inode_operations = {
|
|
.get_link = nfs_get_link,
|
|
.getattr = nfs_getattr,
|
|
.setattr = nfs_setattr,
|
|
};
|