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-rw-r--r--fs/9p/vfs_inode.c13
-rw-r--r--fs/9p/vfs_inode_dotl.c7
-rw-r--r--fs/autofs4/symlink.c5
-rw-r--r--fs/befs/linuxvfs.c35
-rw-r--r--fs/cifs/cifsfs.h2
-rw-r--r--fs/cifs/link.c28
-rw-r--r--fs/configfs/symlink.c28
-rw-r--r--fs/ecryptfs/inode.c8
-rw-r--r--fs/ext4/symlink.c9
-rw-r--r--fs/f2fs/namei.c18
-rw-r--r--fs/fuse/dir.c19
-rw-r--r--fs/gfs2/inode.c10
-rw-r--r--fs/hostfs/hostfs_kern.c15
-rw-r--r--fs/hppfs/hppfs.c9
-rw-r--r--fs/kernfs/symlink.c22
-rw-r--r--fs/libfs.c12
-rw-r--r--fs/namei.c66
-rw-r--r--fs/nfs/symlink.c19
-rw-r--r--fs/overlayfs/inode.c18
-rw-r--r--fs/proc/base.c2
-rw-r--r--fs/proc/inode.c9
-rw-r--r--fs/proc/namespaces.c2
-rw-r--r--fs/proc/self.c24
-rw-r--r--fs/proc/thread_self.c22
-rw-r--r--fs/xfs/xfs_iops.c10
25 files changed, 169 insertions, 243 deletions
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 0ba11712b388..7cc70a39a1d8 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1230,11 +1230,12 @@ ino_t v9fs_qid2ino(struct p9_qid *qid)
*
*/
-static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *v9fs_vfs_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct v9fs_session_info *v9ses = v9fs_dentry2v9ses(dentry);
struct p9_fid *fid = v9fs_fid_lookup(dentry);
struct p9_wstat *st;
+ char *res;
p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
@@ -1253,14 +1254,14 @@ static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
kfree(st);
return ERR_PTR(-EINVAL);
}
- if (strlen(st->extension) >= PATH_MAX)
- st->extension[PATH_MAX - 1] = '\0';
-
- nd_set_link(nd, st->extension);
+ res = st->extension;
st->extension = NULL;
+ if (strlen(res) >= PATH_MAX)
+ res[PATH_MAX - 1] = '\0';
+
p9stat_free(st);
kfree(st);
- return NULL;
+ return *cookie = res;
}
/**
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index bc2a91f2b910..ae062ffa0f1f 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -909,8 +909,8 @@ error:
*
*/
-static void *
-v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
+static const char *
+v9fs_vfs_follow_link_dotl(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct p9_fid *fid = v9fs_fid_lookup(dentry);
char *target;
@@ -923,8 +923,7 @@ v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
retval = p9_client_readlink(fid, &target);
if (retval)
return ERR_PTR(retval);
- nd_set_link(nd, target);
- return NULL;
+ return *cookie = target;
}
int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
diff --git a/fs/autofs4/symlink.c b/fs/autofs4/symlink.c
index de58cc7b8076..9c6a07739c9b 100644
--- a/fs/autofs4/symlink.c
+++ b/fs/autofs4/symlink.c
@@ -12,14 +12,13 @@
#include "autofs_i.h"
-static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *autofs4_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
struct autofs_info *ino = autofs4_dentry_ino(dentry);
if (ino && !autofs4_oz_mode(sbi))
ino->last_used = jiffies;
- nd_set_link(nd, d_inode(dentry)->i_private);
- return NULL;
+ return d_inode(dentry)->i_private;
}
const struct inode_operations autofs4_symlink_inode_operations = {
diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
index 172e306d68a7..3a1aefb86a11 100644
--- a/fs/befs/linuxvfs.c
+++ b/fs/befs/linuxvfs.c
@@ -42,7 +42,7 @@ static struct inode *befs_iget(struct super_block *, unsigned long);
static struct inode *befs_alloc_inode(struct super_block *sb);
static void befs_destroy_inode(struct inode *inode);
static void befs_destroy_inodecache(void);
-static void *befs_follow_link(struct dentry *, struct nameidata *);
+static const char *befs_follow_link(struct dentry *, void **, struct nameidata *nd);
static int befs_utf2nls(struct super_block *sb, const char *in, int in_len,
char **out, int *out_len);
static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
@@ -463,8 +463,8 @@ befs_destroy_inodecache(void)
* The data stream become link name. Unless the LONG_SYMLINK
* flag is set.
*/
-static void *
-befs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *
+befs_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct super_block *sb = dentry->d_sb;
struct befs_inode_info *befs_ino = BEFS_I(d_inode(dentry));
@@ -474,23 +474,20 @@ befs_follow_link(struct dentry *dentry, struct nameidata *nd)
if (len == 0) {
befs_error(sb, "Long symlink with illegal length");
- link = ERR_PTR(-EIO);
- } else {
- befs_debug(sb, "Follow long symlink");
-
- link = kmalloc(len, GFP_NOFS);
- if (!link) {
- link = ERR_PTR(-ENOMEM);
- } else if (befs_read_lsymlink(sb, data, link, len) != len) {
- kfree(link);
- befs_error(sb, "Failed to read entire long symlink");
- link = ERR_PTR(-EIO);
- } else {
- link[len - 1] = '\0';
- }
+ return ERR_PTR(-EIO);
}
- nd_set_link(nd, link);
- return NULL;
+ befs_debug(sb, "Follow long symlink");
+
+ link = kmalloc(len, GFP_NOFS);
+ if (!link)
+ return ERR_PTR(-ENOMEM);
+ if (befs_read_lsymlink(sb, data, link, len) != len) {
+ kfree(link);
+ befs_error(sb, "Failed to read entire long symlink");
+ return ERR_PTR(-EIO);
+ }
+ link[len - 1] = '\0';
+ return *cookie = link;
}
/*
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index 252f5c15806b..61012da7e9d8 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -120,7 +120,7 @@ extern struct vfsmount *cifs_dfs_d_automount(struct path *path);
#endif
/* Functions related to symlinks */
-extern void *cifs_follow_link(struct dentry *direntry, struct nameidata *nd);
+extern const char *cifs_follow_link(struct dentry *direntry, void **cookie, struct nameidata *nd);
extern int cifs_readlink(struct dentry *direntry, char __user *buffer,
int buflen);
extern int cifs_symlink(struct inode *inode, struct dentry *direntry,
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 252e672d5604..4a439c2c0c7f 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -626,8 +626,8 @@ cifs_hl_exit:
return rc;
}
-void *
-cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
+const char *
+cifs_follow_link(struct dentry *direntry, void **cookie, struct nameidata *nd)
{
struct inode *inode = d_inode(direntry);
int rc = -ENOMEM;
@@ -643,16 +643,18 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink)) {
- rc = PTR_ERR(tlink);
- tlink = NULL;
- goto out;
+ free_xid(xid);
+ return ERR_CAST(tlink);
}
tcon = tlink_tcon(tlink);
server = tcon->ses->server;
full_path = build_path_from_dentry(direntry);
- if (!full_path)
- goto out;
+ if (!full_path) {
+ free_xid(xid);
+ cifs_put_tlink(tlink);
+ return ERR_PTR(-ENOMEM);
+ }
cifs_dbg(FYI, "Full path: %s inode = 0x%p\n", full_path, inode);
@@ -670,17 +672,13 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
&target_path, cifs_sb);
kfree(full_path);
-out:
+ free_xid(xid);
+ cifs_put_tlink(tlink);
if (rc != 0) {
kfree(target_path);
- target_path = ERR_PTR(rc);
+ return ERR_PTR(rc);
}
-
- free_xid(xid);
- if (tlink)
- cifs_put_tlink(tlink);
- nd_set_link(nd, target_path);
- return NULL;
+ return *cookie = target_path;
}
int
diff --git a/fs/configfs/symlink.c b/fs/configfs/symlink.c
index cc9f2546ea4a..fac8e8517f33 100644
--- a/fs/configfs/symlink.c
+++ b/fs/configfs/symlink.c
@@ -279,30 +279,26 @@ static int configfs_getlink(struct dentry *dentry, char * path)
}
-static void *configfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *configfs_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
- int error = -ENOMEM;
unsigned long page = get_zeroed_page(GFP_KERNEL);
+ int error;
- if (page) {
- error = configfs_getlink(dentry, (char *)page);
- if (!error) {
- nd_set_link(nd, (char *)page);
- return (void *)page;
- }
+ if (!page)
+ return ERR_PTR(-ENOMEM);
+
+ error = configfs_getlink(dentry, (char *)page);
+ if (!error) {
+ return *cookie = (void *)page;
}
- nd_set_link(nd, ERR_PTR(error));
- return NULL;
+ free_page(page);
+ return ERR_PTR(error);
}
-static void configfs_put_link(struct dentry *dentry, struct nameidata *nd,
- void *cookie)
+static void configfs_put_link(struct dentry *dentry, void *cookie)
{
- if (cookie) {
- unsigned long page = (unsigned long)cookie;
- free_page(page);
- }
+ free_page((unsigned long)cookie);
}
const struct inode_operations configfs_symlink_inode_operations = {
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index fc850b55db67..cdb9d6c4532d 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -675,18 +675,16 @@ out:
return rc ? ERR_PTR(rc) : buf;
}
-static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *ecryptfs_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
size_t len;
char *buf = ecryptfs_readlink_lower(dentry, &len);
if (IS_ERR(buf))
- goto out;
+ return buf;
fsstack_copy_attr_atime(d_inode(dentry),
d_inode(ecryptfs_dentry_to_lower(dentry)));
buf[len] = '\0';
-out:
- nd_set_link(nd, buf);
- return NULL;
+ return *cookie = buf;
}
/**
diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
index 4264fb1e341a..afec475aaf5c 100644
--- a/fs/ext4/symlink.c
+++ b/fs/ext4/symlink.c
@@ -23,7 +23,7 @@
#include "xattr.h"
#ifdef CONFIG_EXT4_FS_ENCRYPTION
-static void *ext4_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *ext4_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct page *cpage = NULL;
char *caddr, *paddr = NULL;
@@ -37,7 +37,7 @@ static void *ext4_follow_link(struct dentry *dentry, struct nameidata *nd)
ctx = ext4_get_fname_crypto_ctx(inode, inode->i_sb->s_blocksize);
if (IS_ERR(ctx))
- return ctx;
+ return ERR_CAST(ctx);
if (ext4_inode_is_fast_symlink(inode)) {
caddr = (char *) EXT4_I(inode)->i_data;
@@ -46,7 +46,7 @@ static void *ext4_follow_link(struct dentry *dentry, struct nameidata *nd)
cpage = read_mapping_page(inode->i_mapping, 0, NULL);
if (IS_ERR(cpage)) {
ext4_put_fname_crypto_ctx(&ctx);
- return cpage;
+ return ERR_CAST(cpage);
}
caddr = kmap(cpage);
caddr[size] = 0;
@@ -77,13 +77,12 @@ static void *ext4_follow_link(struct dentry *dentry, struct nameidata *nd)
/* Null-terminate the name */
if (res <= plen)
paddr[res] = '\0';
- nd_set_link(nd, paddr);
ext4_put_fname_crypto_ctx(&ctx);
if (cpage) {
kunmap(cpage);
page_cache_release(cpage);
}
- return NULL;
+ return *cookie = paddr;
errout:
ext4_put_fname_crypto_ctx(&ctx);
if (cpage) {
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 658e8079aaf9..d2947937515e 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -296,19 +296,15 @@ fail:
return err;
}
-static void *f2fs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *f2fs_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
- struct page *page = page_follow_link_light(dentry, nd);
-
- if (IS_ERR_OR_NULL(page))
- return page;
-
- /* this is broken symlink case */
- if (*nd_get_link(nd) == 0) {
- page_put_link(dentry, nd, page);
- return ERR_PTR(-ENOENT);
+ const char *link = page_follow_link_light(dentry, cookie, nd);
+ if (!IS_ERR(link) && !*link) {
+ /* this is broken symlink case */
+ page_put_link(dentry, *cookie);
+ link = ERR_PTR(-ENOENT);
}
- return page;
+ return link;
}
static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 0572bca49f15..f9cb260375cf 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1365,7 +1365,7 @@ static int fuse_readdir(struct file *file, struct dir_context *ctx)
return err;
}
-static char *read_link(struct dentry *dentry)
+static const char *fuse_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct inode *inode = d_inode(dentry);
struct fuse_conn *fc = get_fuse_conn(inode);
@@ -1389,26 +1389,15 @@ static char *read_link(struct dentry *dentry)
link = ERR_PTR(ret);
} else {
link[ret] = '\0';
+ *cookie = link;
}
fuse_invalidate_atime(inode);
return link;
}
-static void free_link(char *link)
+static void fuse_put_link(struct dentry *dentry, void *cookie)
{
- if (!IS_ERR(link))
- free_page((unsigned long) link);
-}
-
-static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
-{
- nd_set_link(nd, read_link(dentry));
- return NULL;
-}
-
-static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
-{
- free_link(nd_get_link(nd));
+ free_page((unsigned long) cookie);
}
static int fuse_dir_open(struct inode *inode, struct file *file)
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 1b3ca7a2e3fc..f59390aebffb 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -1548,7 +1548,7 @@ out:
* Returns: 0 on success or error code
*/
-static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *gfs2_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
struct gfs2_holder i_gh;
@@ -1561,8 +1561,7 @@ static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
error = gfs2_glock_nq(&i_gh);
if (error) {
gfs2_holder_uninit(&i_gh);
- nd_set_link(nd, ERR_PTR(error));
- return NULL;
+ return ERR_PTR(error);
}
size = (unsigned int)i_size_read(&ip->i_inode);
@@ -1586,8 +1585,9 @@ static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
brelse(dibh);
out:
gfs2_glock_dq_uninit(&i_gh);
- nd_set_link(nd, buf);
- return NULL;
+ if (!IS_ERR(buf))
+ *cookie = buf;
+ return buf;
}
/**
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index ef263174acd2..f650ed661fab 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -892,7 +892,7 @@ static const struct inode_operations hostfs_dir_iops = {
.setattr = hostfs_setattr,
};
-static void *hostfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *hostfs_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
char *link = __getname();
if (link) {
@@ -906,21 +906,18 @@ static void *hostfs_follow_link(struct dentry *dentry, struct nameidata *nd)
}
if (err < 0) {
__putname(link);
- link = ERR_PTR(err);
+ return ERR_PTR(err);
}
} else {
- link = ERR_PTR(-ENOMEM);
+ return ERR_PTR(-ENOMEM);
}
- nd_set_link(nd, link);
- return NULL;
+ return *cookie = link;
}
-static void hostfs_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
+static void hostfs_put_link(struct dentry *dentry, void *cookie)
{
- char *s = nd_get_link(nd);
- if (!IS_ERR(s))
- __putname(s);
+ __putname(cookie);
}
static const struct inode_operations hostfs_link_iops = {
diff --git a/fs/hppfs/hppfs.c b/fs/hppfs/hppfs.c
index fa2bd5366ecf..b8f24d3b04ee 100644
--- a/fs/hppfs/hppfs.c
+++ b/fs/hppfs/hppfs.c
@@ -642,20 +642,19 @@ static int hppfs_readlink(struct dentry *dentry, char __user *buffer,
buflen);
}
-static void *hppfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *hppfs_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct dentry *proc_dentry = HPPFS_I(d_inode(dentry))->proc_dentry;
- return d_inode(proc_dentry)->i_op->follow_link(proc_dentry, nd);
+ return d_inode(proc_dentry)->i_op->follow_link(proc_dentry, cookie, nd);
}
-static void hppfs_put_link(struct dentry *dentry, struct nameidata *nd,
- void *cookie)
+static void hppfs_put_link(struct dentry *dentry, void *cookie)
{
struct dentry *proc_dentry = HPPFS_I(d_inode(dentry))->proc_dentry;
if (d_inode(proc_dentry)->i_op->put_link)
- d_inode(proc_dentry)->i_op->put_link(proc_dentry, nd, cookie);
+ d_inode(proc_dentry)->i_op->put_link(proc_dentry, cookie);
}
static const struct inode_operations hppfs_dir_iops = {
diff --git a/fs/kernfs/symlink.c b/fs/kernfs/symlink.c
index 8a198898e39a..3c7e799974a2 100644
--- a/fs/kernfs/symlink.c
+++ b/fs/kernfs/symlink.c
@@ -112,25 +112,23 @@ static int kernfs_getlink(struct dentry *dentry, char *path)
return error;
}
-static void *kernfs_iop_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *kernfs_iop_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
int error = -ENOMEM;
unsigned long page = get_zeroed_page(GFP_KERNEL);
- if (page) {
- error = kernfs_getlink(dentry, (char *) page);
- if (error < 0)
- free_page((unsigned long)page);
+ if (!page)
+ return ERR_PTR(-ENOMEM);
+ error = kernfs_getlink(dentry, (char *)page);
+ if (unlikely(error < 0)) {
+ free_page((unsigned long)page);
+ return ERR_PTR(error);
}
- nd_set_link(nd, error ? ERR_PTR(error) : (char *)page);
- return NULL;
+ return *cookie = (char *)page;
}
-static void kernfs_iop_put_link(struct dentry *dentry, struct nameidata *nd,
- void *cookie)
+static void kernfs_iop_put_link(struct dentry *dentry, void *cookie)
{
- char *page = nd_get_link(nd);
- if (!IS_ERR(page))
- free_page((unsigned long)page);
+ free_page((unsigned long)cookie);
}
const struct inode_operations kernfs_symlink_iops = {
diff --git a/fs/libfs.c b/fs/libfs.c
index 72e4e015455f..0c83fde20dbd 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1024,12 +1024,9 @@ int noop_fsync(struct file *file, loff_t start, loff_t end, int datasync)
}
EXPORT_SYMBOL(noop_fsync);
-void kfree_put_link(struct dentry *dentry, struct nameidata *nd,
- void *cookie)
+void kfree_put_link(struct dentry *dentry, void *cookie)
{
- char *s = nd_get_link(nd);
- if (!IS_ERR(s))
- kfree(s);
+ kfree(cookie);
}
EXPORT_SYMBOL(kfree_put_link);
@@ -1094,10 +1091,9 @@ simple_nosetlease(struct file *filp, long arg, struct file_lock **flp,
}
EXPORT_SYMBOL(simple_nosetlease);
-void *simple_follow_link(struct dentry *dentry, struct nameidata *nd)
+const char *simple_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
- nd_set_link(nd, d_inode(dentry)->i_link);
- return NULL;
+ return d_inode(dentry)->i_link;
}
EXPORT_SYMBOL(simple_follow_link);
diff --git a/fs/namei.c b/fs/namei.c
index ab2bcbdbd683..aeca44877371 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -502,7 +502,6 @@ struct nameidata {
int last_type;
unsigned depth;
struct file *base;
- char *saved_names[MAX_NESTED_LINKS + 1];
};
/*
@@ -713,23 +712,11 @@ void nd_jump_link(struct nameidata *nd, struct path *path)
nd->flags |= LOOKUP_JUMPED;
}
-void nd_set_link(struct nameidata *nd, char *path)
-{
- nd->saved_names[nd->depth] = path;
-}
-EXPORT_SYMBOL(nd_set_link);
-
-char *nd_get_link(struct nameidata *nd)
-{
- return nd->saved_names[nd->depth];
-}
-EXPORT_SYMBOL(nd_get_link);
-
static inline void put_link(struct nameidata *nd, struct path *link, void *cookie)
{
struct inode *inode = link->dentry->d_inode;
- if (inode->i_op->put_link)
- inode->i_op->put_link(link->dentry, nd, cookie);
+ if (cookie && inode->i_op->put_link)
+ inode->i_op->put_link(link->dentry, cookie);
path_put(link);
}
@@ -854,7 +841,7 @@ follow_link(struct path *link, struct nameidata *nd, void **p)
{
struct dentry *dentry = link->dentry;
int error;
- char *s;
+ const char *s;
BUG_ON(nd->flags & LOOKUP_RCU);
@@ -869,26 +856,20 @@ follow_link(struct path *link, struct nameidata *nd, void **p)
current->total_link_count++;
touch_atime(link);
- nd_set_link(nd, NULL);
error = security_inode_follow_link(dentry);
if (error)
goto out_put_nd_path;
nd->last_type = LAST_BIND;
- *p = dentry->d_inode->i_op->follow_link(dentry, nd);
- error = PTR_ERR(*p);
- if (IS_ERR(*p))
+ *p = NULL;
+ s = dentry->d_inode->i_op->follow_link(dentry, p, nd);
+ error = PTR_ERR(s);
+ if (IS_ERR(s))
goto out_put_nd_path;
error = 0;
- s = nd_get_link(nd);
if (s) {
- if (unlikely(IS_ERR(s))) {
- path_put(&nd->path);
- put_link(nd, link, *p);
- return PTR_ERR(s);
- }
if (*s == '/') {
if (!nd->root.mnt)
set_root(nd);
@@ -906,7 +887,6 @@ follow_link(struct path *link, struct nameidata *nd, void **p)
return error;
out_put_nd_path:
- *p = NULL;
path_put(&nd->path);
path_put(link);
return error;
@@ -4430,18 +4410,15 @@ EXPORT_SYMBOL(readlink_copy);
*/
int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
{
- struct nameidata nd;
void *cookie;
+ const char *link = dentry->d_inode->i_op->follow_link(dentry, &cookie, NULL);
int res;
- nd.depth = 0;
- cookie = dentry->d_inode->i_op->follow_link(dentry, &nd);
- if (IS_ERR(cookie))
- return PTR_ERR(cookie);
-
- res = readlink_copy(buffer, buflen, nd_get_link(&nd));
- if (dentry->d_inode->i_op->put_link)
- dentry->d_inode->i_op->put_link(dentry, &nd, cookie);
+ if (IS_ERR(link))
+ return PTR_ERR(link);
+ res = readlink_copy(buffer, buflen, link);
+ if (cookie && dentry->d_inode->i_op->put_link)
+ dentry->d_inode->i_op->put_link(dentry, cookie);
return res;
}
EXPORT_SYMBOL(generic_readlink);
@@ -4473,22 +4450,21 @@ int page_readlink(struct dentry *dentry, char __user *buffer, int buflen)
}
EXPORT_SYMBOL(page_readlink);
-void *page_follow_link_light(struct dentry *dentry, struct nameidata *nd)
+const char *page_follow_link_light(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct page *page = NULL;
- nd_set_link(nd, page_getlink(dentry, &page));
- return page;
+ char *res = page_getlink(dentry, &page);
+ if (!IS_ERR(res))
+ *cookie = page;
+ return res;
}
EXPORT_SYMBOL(page_follow_link_light);
-void page_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
+void page_put_link(struct dentry *dentry, void *cookie)
{
struct page *page = cookie;
-
- if (page) {
- kunmap(page);
- page_cache_release(page);
- }
+ kunmap(page);
+ page_cache_release(page);
}
EXPORT_SYMBOL(page_put_link);
diff --git a/fs/nfs/symlink.c b/fs/nfs/symlink.c
index 2d56200655fe..c992b200ae7e 100644
--- a/fs/nfs/symlink.c
+++ b/fs/nfs/symlink.c
@@ -20,7 +20,6 @@
#include <linux/stat.h>
#include <linux/mm.h>
#include <linux/string.h>
-#include <linux/namei.h>
/* Symlink caching in the page cache is even more simplistic
* and straight-forward than readdir caching.
@@ -43,7 +42,7 @@ error:
return -EIO;
}
-static void *nfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *nfs_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct inode *inode = d_inode(dentry);
struct page *page;
@@ -51,19 +50,13 @@ static void *nfs_follow_link(struct dentry *dentry, struct nameidata *nd)
err = ERR_PTR(nfs_revalidate_mapping(inode, inode->i_mapping));
if (err)
- goto read_failed;
+ return err;
page = read_cache_page(&inode->i_data, 0,
(filler_t *)nfs_symlink_filler, inode);
- if (IS_ERR(page)) {
- err = page;
- goto read_failed;
- }
- nd_set_link(nd, kmap(page));
- return page;
-
-read_failed:
- nd_set_link(nd, err);
- return NULL;
+ if (IS_ERR(page))
+ return ERR_CAST(page);
+ *cookie = page;
+ return kmap(page);
}
/*
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 1b4b9c5e51b7..235ad42afb57 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -140,12 +140,12 @@ struct ovl_link_data {
void *cookie;
};
-static void *ovl_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *ovl_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
- void *ret;
struct dentry *realdentry;
struct inode *realinode;
struct ovl_link_data *data = NULL;
+ const char *ret;
realdentry = ovl_dentry_real(dentry);
realinode = realdentry->d_inode;
@@ -160,19 +160,21 @@ static void *ovl_follow_link(struct dentry *dentry, struct nameidata *nd)
data->realdentry = realdentry;
}
- ret = realinode->i_op->follow_link(realdentry, nd);
- if (IS_ERR(ret)) {
+ ret = realinode->i_op->follow_link(realdentry, cookie, nd);
+ if (IS_ERR_OR_NULL(ret)) {
kfree(data);
return ret;
}
if (data)
- data->cookie = ret;
+ data->cookie = *cookie;
- return data;
+ *cookie = data;
+
+ return ret;
}
-static void ovl_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
+static void ovl_put_link(struct dentry *dentry, void *c)
{
struct inode *realinode;
struct ovl_link_data *data = c;
@@ -181,7 +183,7 @@ static void ovl_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
return;
realinode = data->realdentry->d_inode;
- realinode->i_op->put_link(data->realdentry, nd, data->cookie);
+ realinode->i_op->put_link(data->realdentry, data->cookie);
kfree(data);
}
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 093ca14f5701..52652f86b187 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1380,7 +1380,7 @@ static int proc_exe_link(struct dentry *dentry, struct path *exe_path)
return -ENOENT;
}
-static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *proc_pid_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct inode *inode = d_inode(dentry);
struct path path;
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 8272aaba1bb0..acd51d75387d 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -23,7 +23,6 @@
#include <linux/slab.h>
#include <linux/mount.h>
#include <linux/magic.h>
-#include <linux/namei.h>
#include <asm/uaccess.h>
@@ -394,16 +393,16 @@ static const struct file_operations proc_reg_file_ops_no_compat = {
};
#endif
-static void *proc_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *proc_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct proc_dir_entry *pde = PDE(d_inode(dentry));
if (unlikely(!use_pde(pde)))
return ERR_PTR(-EINVAL);
- nd_set_link(nd, pde->data);
- return pde;
+ *cookie = pde;
+ return pde->data;
}
-static void proc_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
+static void proc_put_link(struct dentry *dentry, void *p)
{
unuse_pde(p);
}
diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c
index e512642dbbdc..10d24dd096e8 100644
--- a/fs/proc/namespaces.c
+++ b/fs/proc/namespaces.c
@@ -30,7 +30,7 @@ static const struct proc_ns_operations *ns_entries[] = {
&mntns_operations,
};
-static void *proc_ns_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *proc_ns_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct inode *inode = d_inode(dentry);
const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops;
diff --git a/fs/proc/self.c b/fs/proc/self.c
index 6195b4a7c3b1..ad333946b53a 100644
--- a/fs/proc/self.c
+++ b/fs/proc/self.c
@@ -1,5 +1,4 @@
#include <linux/sched.h>
-#include <linux/namei.h>
#include <linux/slab.h>
#include <linux/pid_namespace.h>
#include "internal.h"
@@ -19,21 +18,20 @@ static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
return readlink_copy(buffer, buflen, tmp);
}
-static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *proc_self_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct pid_namespace *ns = dentry->d_sb->s_fs_info;
pid_t tgid = task_tgid_nr_ns(current, ns);
- char *name = ERR_PTR(-ENOENT);
- if (tgid) {
- /* 11 for max length of signed int in decimal + NULL term */
- name = kmalloc(12, GFP_KERNEL);
- if (!name)
- name = ERR_PTR(-ENOMEM);
- else
- sprintf(name, "%d", tgid);
- }
- nd_set_link(nd, name);
- return NULL;
+ char *name;
+
+ if (!tgid)
+ return ERR_PTR(-ENOENT);
+ /* 11 for max length of signed int in decimal + NULL term */
+ name = kmalloc(12, GFP_KERNEL);
+ if (!name)
+ return ERR_PTR(-ENOMEM);
+ sprintf(name, "%d", tgid);
+ return *cookie = name;
}
static const struct inode_operations proc_self_inode_operations = {
diff --git a/fs/proc/thread_self.c b/fs/proc/thread_self.c
index a8371993b4fb..85c96e0d7aaa 100644
--- a/fs/proc/thread_self.c
+++ b/fs/proc/thread_self.c
@@ -1,5 +1,4 @@
#include <linux/sched.h>
-#include <linux/namei.h>
#include <linux/slab.h>
#include <linux/pid_namespace.h>
#include "internal.h"
@@ -20,21 +19,20 @@ static int proc_thread_self_readlink(struct dentry *dentry, char __user *buffer,
return readlink_copy(buffer, buflen, tmp);
}
-static void *proc_thread_self_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *proc_thread_self_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct pid_namespace *ns = dentry->d_sb->s_fs_info;
pid_t tgid = task_tgid_nr_ns(current, ns);
pid_t pid = task_pid_nr_ns(current, ns);
- char *name = ERR_PTR(-ENOENT);
- if (pid) {
- name = kmalloc(PROC_NUMBUF + 6 + PROC_NUMBUF, GFP_KERNEL);
- if (!name)
- name = ERR_PTR(-ENOMEM);
- else
- sprintf(name, "%d/task/%d", tgid, pid);
- }
- nd_set_link(nd, name);
- return NULL;
+ char *name;
+
+ if (!pid)
+ return ERR_PTR(-ENOENT);
+ name = kmalloc(PROC_NUMBUF + 6 + PROC_NUMBUF, GFP_KERNEL);
+ if (!name)
+ return ERR_PTR(-ENOMEM);
+ sprintf(name, "%d/task/%d", tgid, pid);
+ return *cookie = name;
}
static const struct inode_operations proc_thread_self_inode_operations = {
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index f4cd7204e236..26c4dcb1ef56 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -41,7 +41,6 @@
#include <linux/capability.h>
#include <linux/xattr.h>
-#include <linux/namei.h>
#include <linux/posix_acl.h>
#include <linux/security.h>
#include <linux/fiemap.h>
@@ -414,9 +413,10 @@ xfs_vn_rename(
* we need to be very careful about how much stack we use.
* uio is kmalloced for this reason...
*/
-STATIC void *
+STATIC const char *
xfs_vn_follow_link(
struct dentry *dentry,
+ void **cookie,
struct nameidata *nd)
{
char *link;
@@ -430,14 +430,12 @@ xfs_vn_follow_link(
if (unlikely(error))
goto out_kfree;
- nd_set_link(nd, link);
- return NULL;
+ return *cookie = link;
out_kfree:
kfree(link);
out_err:
- nd_set_link(nd, ERR_PTR(error));
- return NULL;
+ return ERR_PTR(error);
}
STATIC int
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.