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jffs2: switch to simple_follow_link()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-05-02 10:21:20 -04:00
parent 75e7566bea
commit a8db149fc9
3 changed files with 3 additions and 44 deletions
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1
fs/jffs2/dir.c
View File

@ -354,6 +354,7 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
ret = -ENOMEM; ret = -ENOMEM;
goto fail; goto fail;
} }
inode->i_link = f->target;
jffs2_dbg(1, "%s(): symlink's target '%s' cached\n", jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
__func__, (char *)f->target); __func__, (char *)f->target);

1
fs/jffs2/fs.c
View File

@ -294,6 +294,7 @@ struct inode *jffs2_iget(struct super_block *sb, unsigned long ino)
case S_IFLNK: case S_IFLNK:
inode->i_op = &jffs2_symlink_inode_operations; inode->i_op = &jffs2_symlink_inode_operations;
inode->i_link = f->target;
break; break;
case S_IFDIR: case S_IFDIR:

45
fs/jffs2/symlink.c
View File

@ -9,58 +9,15 @@
* *
*/ */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include "nodelist.h" #include "nodelist.h"
static void *jffs2_follow_link(struct dentry *dentry, struct nameidata *nd);
const struct inode_operations jffs2_symlink_inode_operations = const struct inode_operations jffs2_symlink_inode_operations =
{ {
.readlink = generic_readlink, .readlink = generic_readlink,
.follow_link = jffs2_follow_link, .follow_link = simple_follow_link,
.setattr = jffs2_setattr, .setattr = jffs2_setattr,
.setxattr = jffs2_setxattr, .setxattr = jffs2_setxattr,
.getxattr = jffs2_getxattr, .getxattr = jffs2_getxattr,
.listxattr = jffs2_listxattr, .listxattr = jffs2_listxattr,
.removexattr = jffs2_removexattr .removexattr = jffs2_removexattr
}; };
static void *jffs2_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry));
char *p = (char *)f->target;
/*
* We don't acquire the f->sem mutex here since the only data we
* use is f->target.
*
* 1. If we are here the inode has already built and f->target has
* to point to the target path.
* 2. Nobody uses f->target (if the inode is symlink's inode). The
* exception is inode freeing function which frees f->target. But
* it can't be called while we are here and before VFS has
* stopped using our f->target string which we provide by means of
* nd_set_link() call.
*/
if (!p) {
pr_err("%s(): can't find symlink target\n", __func__);
p = ERR_PTR(-EIO);
}
jffs2_dbg(1, "%s(): target path is '%s'\n",
__func__, (char *)f->target);
nd_set_link(nd, p);
/*
* We will unlock the f->sem mutex but VFS will use the f->target string. This is safe
* since the only way that may cause f->target to be changed is iput() operation.
* But VFS will not use f->target after iput() has been called.
*/
return NULL;
}