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-rw-r--r--fs/internal.h2
-rw-r--r--fs/namei.c80
-rw-r--r--fs/nfsctl.c21
-rw-r--r--fs/open.c14
4 files changed, 72 insertions, 45 deletions
diff --git a/fs/internal.h b/fs/internal.h
index 6fdbdf2c604..52abc5287f5 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -114,6 +114,8 @@ struct open_flags {
};
extern struct file *do_filp_open(int dfd, const char *pathname,
const struct open_flags *op, int lookup_flags);
+extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
+ const char *, const struct open_flags *, int lookup_flags);
/*
* inode.c
diff --git a/fs/namei.c b/fs/namei.c
index 8ee7785d564..abc8d2df121 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1487,11 +1487,13 @@ static int path_init(int dfd, const char *name, unsigned int flags,
nd->depth = 0;
if (flags & LOOKUP_ROOT) {
struct inode *inode = nd->root.dentry->d_inode;
- if (!inode->i_op->lookup)
- return -ENOTDIR;
- retval = inode_permission(inode, MAY_EXEC);
- if (retval)
- return retval;
+ if (*name) {
+ if (!inode->i_op->lookup)
+ return -ENOTDIR;
+ retval = inode_permission(inode, MAY_EXEC);
+ if (retval)
+ return retval;
+ }
nd->path = nd->root;
nd->inode = inode;
if (flags & LOOKUP_RCU) {
@@ -1937,7 +1939,7 @@ int vfs_create(struct inode *dir, struct dentry *dentry, int mode,
return error;
}
-int may_open(struct path *path, int acc_mode, int flag)
+static int may_open(struct path *path, int acc_mode, int flag)
{
struct dentry *dentry = path->dentry;
struct inode *inode = dentry->d_inode;
@@ -2250,11 +2252,10 @@ exit:
}
static struct file *path_openat(int dfd, const char *pathname,
- const struct open_flags *op, int flags)
+ struct nameidata *nd, const struct open_flags *op, int flags)
{
struct file *base = NULL;
struct file *filp;
- struct nameidata nd;
struct path path;
int count = 0;
int error;
@@ -2264,27 +2265,27 @@ static struct file *path_openat(int dfd, const char *pathname,
return ERR_PTR(-ENFILE);
filp->f_flags = op->open_flag;
- nd.intent.open.file = filp;
- nd.intent.open.flags = open_to_namei_flags(op->open_flag);
- nd.intent.open.create_mode = op->mode;
+ nd->intent.open.file = filp;
+ nd->intent.open.flags = open_to_namei_flags(op->open_flag);
+ nd->intent.open.create_mode = op->mode;
- error = path_init(dfd, pathname, flags | LOOKUP_PARENT, &nd, &base);
+ error = path_init(dfd, pathname, flags | LOOKUP_PARENT, nd, &base);
if (unlikely(error))
goto out_filp;
current->total_link_count = 0;
- error = link_path_walk(pathname, &nd);
+ error = link_path_walk(pathname, nd);
if (unlikely(error))
goto out_filp;
- filp = do_last(&nd, &path, op, pathname);
+ filp = do_last(nd, &path, op, pathname);
while (unlikely(!filp)) { /* trailing symlink */
struct path link = path;
struct inode *linki = link.dentry->d_inode;
void *cookie;
- if (!(nd.flags & LOOKUP_FOLLOW) || count++ == 32) {
- path_put_conditional(&path, &nd);
- path_put(&nd.path);
+ if (!(nd->flags & LOOKUP_FOLLOW) || count++ == 32) {
+ path_put_conditional(&path, nd);
+ path_put(&nd->path);
filp = ERR_PTR(-ELOOP);
break;
}
@@ -2299,23 +2300,23 @@ static struct file *path_openat(int dfd, const char *pathname,
* have to putname() it when we are done. Procfs-like symlinks
* just set LAST_BIND.
*/
- nd.flags |= LOOKUP_PARENT;
- nd.flags &= ~(LOOKUP_OPEN|LOOKUP_CREATE|LOOKUP_EXCL);
- error = __do_follow_link(&link, &nd, &cookie);
+ nd->flags |= LOOKUP_PARENT;
+ nd->flags &= ~(LOOKUP_OPEN|LOOKUP_CREATE|LOOKUP_EXCL);
+ error = __do_follow_link(&link, nd, &cookie);
if (unlikely(error))
filp = ERR_PTR(error);
else
- filp = do_last(&nd, &path, op, pathname);
+ filp = do_last(nd, &path, op, pathname);
if (!IS_ERR(cookie) && linki->i_op->put_link)
- linki->i_op->put_link(link.dentry, &nd, cookie);
+ linki->i_op->put_link(link.dentry, nd, cookie);
path_put(&link);
}
out:
- if (nd.root.mnt && !(nd.flags & LOOKUP_ROOT))
- path_put(&nd.root);
+ if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT))
+ path_put(&nd->root);
if (base)
fput(base);
- release_open_intent(&nd);
+ release_open_intent(nd);
return filp;
out_filp:
@@ -2326,16 +2327,39 @@ out_filp:
struct file *do_filp_open(int dfd, const char *pathname,
const struct open_flags *op, int flags)
{
+ struct nameidata nd;
struct file *filp;
- filp = path_openat(dfd, pathname, op, flags | LOOKUP_RCU);
+ filp = path_openat(dfd, pathname, &nd, op, flags | LOOKUP_RCU);
if (unlikely(filp == ERR_PTR(-ECHILD)))
- filp = path_openat(dfd, pathname, op, flags);
+ filp = path_openat(dfd, pathname, &nd, op, flags);
if (unlikely(filp == ERR_PTR(-ESTALE)))
- filp = path_openat(dfd, pathname, op, flags | LOOKUP_REVAL);
+ filp = path_openat(dfd, pathname, &nd, op, flags | LOOKUP_REVAL);
return filp;
}
+struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt,
+ const char *name, const struct open_flags *op, int flags)
+{
+ struct nameidata nd;
+ struct file *file;
+
+ nd.root.mnt = mnt;
+ nd.root.dentry = dentry;
+
+ flags |= LOOKUP_ROOT;
+
+ if (dentry->d_inode->i_op->follow_link)
+ return ERR_PTR(-ELOOP);
+
+ file = path_openat(-1, name, &nd, op, flags | LOOKUP_RCU);
+ if (unlikely(file == ERR_PTR(-ECHILD)))
+ file = path_openat(-1, name, &nd, op, flags);
+ if (unlikely(file == ERR_PTR(-ESTALE)))
+ file = path_openat(-1, name, &nd, op, flags | LOOKUP_REVAL);
+ return file;
+}
+
/**
* lookup_create - lookup a dentry, creating it if it doesn't exist
* @nd: nameidata info
diff --git a/fs/nfsctl.c b/fs/nfsctl.c
index bf9cbd242dd..124e8fcb0dd 100644
--- a/fs/nfsctl.c
+++ b/fs/nfsctl.c
@@ -22,30 +22,17 @@
static struct file *do_open(char *name, int flags)
{
- struct nameidata nd;
struct vfsmount *mnt;
- int error;
+ struct file *file;
mnt = do_kern_mount("nfsd", 0, "nfsd", NULL);
if (IS_ERR(mnt))
return (struct file *)mnt;
- error = vfs_path_lookup(mnt->mnt_root, mnt, name, 0, &nd);
- mntput(mnt); /* drop do_kern_mount reference */
- if (error)
- return ERR_PTR(error);
-
- if (flags == O_RDWR)
- error = may_open(&nd.path, MAY_READ|MAY_WRITE, flags);
- else
- error = may_open(&nd.path, MAY_WRITE, flags);
+ file = file_open_root(mnt->mnt_root, mnt, name, flags);
- if (!error)
- return dentry_open(nd.path.dentry, nd.path.mnt, flags,
- current_cred());
-
- path_put(&nd.path);
- return ERR_PTR(error);
+ mntput(mnt); /* drop do_kern_mount reference */
+ return file;
}
static struct {
diff --git a/fs/open.c b/fs/open.c
index d05e18c60ba..48afc5c139d 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -959,6 +959,20 @@ struct file *filp_open(const char *filename, int flags, int mode)
}
EXPORT_SYMBOL(filp_open);
+struct file *file_open_root(struct dentry *dentry, struct vfsmount *mnt,
+ const char *filename, int flags)
+{
+ struct open_flags op;
+ int lookup = build_open_flags(flags, 0, &op);
+ if (flags & O_CREAT)
+ return ERR_PTR(-EINVAL);
+ if (!filename && (flags & O_DIRECTORY))
+ if (!dentry->d_inode->i_op->lookup)
+ return ERR_PTR(-ENOTDIR);
+ return do_file_open_root(dentry, mnt, filename, &op, lookup);
+}
+EXPORT_SYMBOL(file_open_root);
+
long do_sys_open(int dfd, const char __user *filename, int flags, int mode)
{
struct open_flags op;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-12 12:03:39 +0000