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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /fs/nfs/symlink.c | |
parent | Initial commit. (diff) | |
download | linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/nfs/symlink.c')
-rw-r--r-- | fs/nfs/symlink.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/fs/nfs/symlink.c b/fs/nfs/symlink.c new file mode 100644 index 000000000..25ba299fd --- /dev/null +++ b/fs/nfs/symlink.c @@ -0,0 +1,85 @@ +// 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(void *data, struct page *page) +{ + struct inode *inode = data; + int error; + + error = NFS_PROTO(inode)->readlink(inode, page, 0, PAGE_SIZE); + if (error < 0) + goto error; + SetPageUptodate(page); + unlock_page(page); + return 0; + +error: + SetPageError(page); + unlock_page(page); + return -EIO; +} + +static const char *nfs_get_link(struct dentry *dentry, + struct inode *inode, + struct delayed_call *done) +{ + struct page *page; + void *err; + + if (!dentry) { + err = ERR_PTR(nfs_revalidate_mapping_rcu(inode)); + if (err) + return err; + page = find_get_page(inode->i_mapping, 0); + if (!page) + return ERR_PTR(-ECHILD); + if (!PageUptodate(page)) { + put_page(page); + return ERR_PTR(-ECHILD); + } + } else { + err = ERR_PTR(nfs_revalidate_mapping(inode, inode->i_mapping)); + if (err) + return err; + page = read_cache_page(&inode->i_data, 0, nfs_symlink_filler, + inode); + if (IS_ERR(page)) + return ERR_CAST(page); + } + set_delayed_call(done, page_put_link, page); + return page_address(page); +} + +/* + * symlinks can't do much... + */ +const struct inode_operations nfs_symlink_inode_operations = { + .get_link = nfs_get_link, + .getattr = nfs_getattr, + .setattr = nfs_setattr, +}; |