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Diffstat (limited to 'fs')
-rw-r--r--fs/coredump.c4
-rw-r--r--fs/fhandle.c2
-rw-r--r--fs/internal.h2
-rw-r--r--fs/kernel_read_file.c2
-rw-r--r--fs/namei.c80
-rw-r--r--fs/nfs/nfstrace.h4
-rw-r--r--fs/open.c4
-rw-r--r--fs/proc/proc_sysctl.c2
8 files changed, 53 insertions, 47 deletions
diff --git a/fs/coredump.c b/fs/coredump.c
index c3d8fc14b993..07afb5ddb1c4 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -755,8 +755,8 @@ void do_coredump(const kernel_siginfo_t *siginfo)
task_lock(&init_task);
get_fs_root(init_task.fs, &root);
task_unlock(&init_task);
- cprm.file = file_open_root(root.dentry, root.mnt,
- cn.corename, open_flags, 0600);
+ cprm.file = file_open_root(&root, cn.corename,
+ open_flags, 0600);
path_put(&root);
} else {
cprm.file = filp_open(cn.corename, open_flags, 0600);
diff --git a/fs/fhandle.c b/fs/fhandle.c
index ec6feeccc276..6630c69c23a2 100644
--- a/fs/fhandle.c
+++ b/fs/fhandle.c
@@ -229,7 +229,7 @@ static long do_handle_open(int mountdirfd, struct file_handle __user *ufh,
path_put(&path);
return fd;
}
- file = file_open_root(path.dentry, path.mnt, "", open_flag, 0);
+ file = file_open_root(&path, "", open_flag, 0);
if (IS_ERR(file)) {
put_unused_fd(fd);
retval = PTR_ERR(file);
diff --git a/fs/internal.h b/fs/internal.h
index 6aeae7ef3380..3ce8edbaa3ca 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -129,7 +129,7 @@ struct open_flags {
};
extern struct file *do_filp_open(int dfd, struct filename *pathname,
const struct open_flags *op);
-extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
+extern struct file *do_file_open_root(const struct path *,
const char *, const struct open_flags *);
extern struct open_how build_open_how(int flags, umode_t mode);
extern int build_open_flags(const struct open_how *how, struct open_flags *op);
diff --git a/fs/kernel_read_file.c b/fs/kernel_read_file.c
index 90d255fbdd9b..87aac4c72c37 100644
--- a/fs/kernel_read_file.c
+++ b/fs/kernel_read_file.c
@@ -160,7 +160,7 @@ int kernel_read_file_from_path_initns(const char *path, loff_t offset,
get_fs_root(init_task.fs, &root);
task_unlock(&init_task);
- file = file_open_root(root.dentry, root.mnt, path, O_RDONLY, 0);
+ file = file_open_root(&root, path, O_RDONLY, 0);
path_put(&root);
if (IS_ERR(file))
return PTR_ERR(file);
diff --git a/fs/namei.c b/fs/namei.c
index 79b0ff9b151e..bf6d8a738c59 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -554,7 +554,7 @@ struct nameidata {
struct qstr last;
struct path root;
struct inode *inode; /* path.dentry.d_inode */
- unsigned int flags;
+ unsigned int flags, state;
unsigned seq, m_seq, r_seq;
int last_type;
unsigned depth;
@@ -573,10 +573,15 @@ struct nameidata {
umode_t dir_mode;
} __randomize_layout;
-static void set_nameidata(struct nameidata *p, int dfd, struct filename *name)
+#define ND_ROOT_PRESET 1
+#define ND_ROOT_GRABBED 2
+#define ND_JUMPED 4
+
+static void __set_nameidata(struct nameidata *p, int dfd, struct filename *name)
{
struct nameidata *old = current->nameidata;
p->stack = p->internal;
+ p->depth = 0;
p->dfd = dfd;
p->name = name;
p->path.mnt = NULL;
@@ -586,6 +591,17 @@ static void set_nameidata(struct nameidata *p, int dfd, struct filename *name)
current->nameidata = p;
}
+static inline void set_nameidata(struct nameidata *p, int dfd, struct filename *name,
+ const struct path *root)
+{
+ __set_nameidata(p, dfd, name);
+ p->state = 0;
+ if (unlikely(root)) {
+ p->state = ND_ROOT_PRESET;
+ p->root = *root;
+ }
+}
+
static void restore_nameidata(void)
{
struct nameidata *now = current->nameidata, *old = now->saved;
@@ -645,9 +661,9 @@ static void terminate_walk(struct nameidata *nd)
path_put(&nd->path);
for (i = 0; i < nd->depth; i++)
path_put(&nd->stack[i].link);
- if (nd->flags & LOOKUP_ROOT_GRABBED) {
+ if (nd->state & ND_ROOT_GRABBED) {
path_put(&nd->root);
- nd->flags &= ~LOOKUP_ROOT_GRABBED;
+ nd->state &= ~ND_ROOT_GRABBED;
}
} else {
nd->flags &= ~LOOKUP_RCU;
@@ -710,9 +726,9 @@ static bool legitimize_root(struct nameidata *nd)
if (!nd->root.mnt && (nd->flags & LOOKUP_IS_SCOPED))
return false;
/* Nothing to do if nd->root is zero or is managed by the VFS user. */
- if (!nd->root.mnt || (nd->flags & LOOKUP_ROOT))
+ if (!nd->root.mnt || (nd->state & ND_ROOT_PRESET))
return true;
- nd->flags |= LOOKUP_ROOT_GRABBED;
+ nd->state |= ND_ROOT_GRABBED;
return legitimize_path(nd, &nd->root, nd->root_seq);
}
@@ -849,8 +865,9 @@ static int complete_walk(struct nameidata *nd)
* We don't want to zero nd->root for scoped-lookups or
* externally-managed nd->root.
*/
- if (!(nd->flags & (LOOKUP_ROOT | LOOKUP_IS_SCOPED)))
- nd->root.mnt = NULL;
+ if (!(nd->state & ND_ROOT_PRESET))
+ if (!(nd->flags & LOOKUP_IS_SCOPED))
+ nd->root.mnt = NULL;
nd->flags &= ~LOOKUP_CACHED;
if (!try_to_unlazy(nd))
return -ECHILD;
@@ -877,7 +894,7 @@ static int complete_walk(struct nameidata *nd)
return -EXDEV;
}
- if (likely(!(nd->flags & LOOKUP_JUMPED)))
+ if (likely(!(nd->state & ND_JUMPED)))
return 0;
if (likely(!(dentry->d_flags & DCACHE_OP_WEAK_REVALIDATE)))
@@ -915,7 +932,7 @@ static int set_root(struct nameidata *nd)
} while (read_seqcount_retry(&fs->seq, seq));
} else {
get_fs_root(fs, &nd->root);
- nd->flags |= LOOKUP_ROOT_GRABBED;
+ nd->state |= ND_ROOT_GRABBED;
}
return 0;
}
@@ -948,7 +965,7 @@ static int nd_jump_root(struct nameidata *nd)
path_get(&nd->path);
nd->inode = nd->path.dentry->d_inode;
}
- nd->flags |= LOOKUP_JUMPED;
+ nd->state |= ND_JUMPED;
return 0;
}
@@ -976,7 +993,7 @@ int nd_jump_link(struct path *path)
path_put(&nd->path);
nd->path = *path;
nd->inode = nd->path.dentry->d_inode;
- nd->flags |= LOOKUP_JUMPED;
+ nd->state |= ND_JUMPED;
return 0;
err:
@@ -1423,7 +1440,7 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
if (mounted) {
path->mnt = &mounted->mnt;
dentry = path->dentry = mounted->mnt.mnt_root;
- nd->flags |= LOOKUP_JUMPED;
+ nd->state |= ND_JUMPED;
*seqp = read_seqcount_begin(&dentry->d_seq);
*inode = dentry->d_inode;
/*
@@ -1468,7 +1485,7 @@ static inline int handle_mounts(struct nameidata *nd, struct dentry *dentry,
if (unlikely(nd->flags & LOOKUP_NO_XDEV))
ret = -EXDEV;
else
- nd->flags |= LOOKUP_JUMPED;
+ nd->state |= ND_JUMPED;
}
if (unlikely(ret)) {
dput(path->dentry);
@@ -2219,7 +2236,7 @@ static int link_path_walk(const char *name, struct nameidata *nd)
case 2:
if (name[1] == '.') {
type = LAST_DOTDOT;
- nd->flags |= LOOKUP_JUMPED;
+ nd->state |= ND_JUMPED;
}
break;
case 1:
@@ -2227,7 +2244,7 @@ static int link_path_walk(const char *name, struct nameidata *nd)
}
if (likely(type == LAST_NORM)) {
struct dentry *parent = nd->path.dentry;
- nd->flags &= ~LOOKUP_JUMPED;
+ nd->state &= ~ND_JUMPED;
if (unlikely(parent->d_flags & DCACHE_OP_HASH)) {
struct qstr this = { { .hash_len = hash_len }, .name = name };
err = parent->d_op->d_hash(parent, &this);
@@ -2301,14 +2318,14 @@ static const char *path_init(struct nameidata *nd, unsigned flags)
if (flags & LOOKUP_RCU)
rcu_read_lock();
- nd->flags = flags | LOOKUP_JUMPED;
- nd->depth = 0;
+ nd->flags = flags;
+ nd->state |= ND_JUMPED;
nd->m_seq = __read_seqcount_begin(&mount_lock.seqcount);
nd->r_seq = __read_seqcount_begin(&rename_lock.seqcount);
smp_rmb();
- if (flags & LOOKUP_ROOT) {
+ if (nd->state & ND_ROOT_PRESET) {
struct dentry *root = nd->root.dentry;
struct inode *inode = root->d_inode;
if (*s && unlikely(!d_can_lookup(root)))
@@ -2383,7 +2400,7 @@ static const char *path_init(struct nameidata *nd, unsigned flags)
nd->root_seq = nd->seq;
} else {
path_get(&nd->root);
- nd->flags |= LOOKUP_ROOT_GRABBED;
+ nd->state |= ND_ROOT_GRABBED;
}
}
return s;
@@ -2422,7 +2439,7 @@ static int path_lookupat(struct nameidata *nd, unsigned flags, struct path *path
;
if (!err && unlikely(nd->flags & LOOKUP_MOUNTPOINT)) {
err = handle_lookup_down(nd);
- nd->flags &= ~LOOKUP_JUMPED; // no d_weak_revalidate(), please...
+ nd->state &= ~ND_JUMPED; // no d_weak_revalidate(), please...
}
if (!err)
err = complete_walk(nd);
@@ -2446,11 +2463,7 @@ int filename_lookup(int dfd, struct filename *name, unsigned flags,
struct nameidata nd;
if (IS_ERR(name))
return PTR_ERR(name);
- if (unlikely(root)) {
- nd.root = *root;
- flags |= LOOKUP_ROOT;
- }
- set_nameidata(&nd, dfd, name);
+ set_nameidata(&nd, dfd, name, root);
retval = path_lookupat(&nd, flags | LOOKUP_RCU, path);
if (unlikely(retval == -ECHILD))
retval = path_lookupat(&nd, flags, path);
@@ -2491,7 +2504,7 @@ static struct filename *filename_parentat(int dfd, struct filename *name,
if (IS_ERR(name))
return name;
- set_nameidata(&nd, dfd, name);
+ set_nameidata(&nd, dfd, name, NULL);
retval = path_parentat(&nd, flags | LOOKUP_RCU, parent);
if (unlikely(retval == -ECHILD))
retval = path_parentat(&nd, flags, parent);
@@ -3517,7 +3530,7 @@ struct file *do_filp_open(int dfd, struct filename *pathname,
int flags = op->lookup_flags;
struct file *filp;
- set_nameidata(&nd, dfd, pathname);
+ set_nameidata(&nd, dfd, pathname, NULL);
filp = path_openat(&nd, op, flags | LOOKUP_RCU);
if (unlikely(filp == ERR_PTR(-ECHILD)))
filp = path_openat(&nd, op, flags);
@@ -3527,25 +3540,22 @@ struct file *do_filp_open(int dfd, struct filename *pathname,
return filp;
}
-struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt,
+struct file *do_file_open_root(const struct path *root,
const char *name, const struct open_flags *op)
{
struct nameidata nd;
struct file *file;
struct filename *filename;
- int flags = op->lookup_flags | LOOKUP_ROOT;
-
- nd.root.mnt = mnt;
- nd.root.dentry = dentry;
+ int flags = op->lookup_flags;
- if (d_is_symlink(dentry) && op->intent & LOOKUP_OPEN)
+ if (d_is_symlink(root->dentry) && op->intent & LOOKUP_OPEN)
return ERR_PTR(-ELOOP);
filename = getname_kernel(name);
if (IS_ERR(filename))
return ERR_CAST(filename);
- set_nameidata(&nd, -1, filename);
+ set_nameidata(&nd, -1, filename, root);
file = path_openat(&nd, op, flags | LOOKUP_RCU);
if (unlikely(file == ERR_PTR(-ECHILD)))
file = path_openat(&nd, op, flags);
diff --git a/fs/nfs/nfstrace.h b/fs/nfs/nfstrace.h
index 73080526f5f3..8a224871be74 100644
--- a/fs/nfs/nfstrace.h
+++ b/fs/nfs/nfstrace.h
@@ -280,8 +280,6 @@ TRACE_DEFINE_ENUM(LOOKUP_OPEN);
TRACE_DEFINE_ENUM(LOOKUP_CREATE);
TRACE_DEFINE_ENUM(LOOKUP_EXCL);
TRACE_DEFINE_ENUM(LOOKUP_RENAME_TARGET);
-TRACE_DEFINE_ENUM(LOOKUP_JUMPED);
-TRACE_DEFINE_ENUM(LOOKUP_ROOT);
TRACE_DEFINE_ENUM(LOOKUP_EMPTY);
TRACE_DEFINE_ENUM(LOOKUP_DOWN);
@@ -297,8 +295,6 @@ TRACE_DEFINE_ENUM(LOOKUP_DOWN);
{ LOOKUP_CREATE, "CREATE" }, \
{ LOOKUP_EXCL, "EXCL" }, \
{ LOOKUP_RENAME_TARGET, "RENAME_TARGET" }, \
- { LOOKUP_JUMPED, "JUMPED" }, \
- { LOOKUP_ROOT, "ROOT" }, \
{ LOOKUP_EMPTY, "EMPTY" }, \
{ LOOKUP_DOWN, "DOWN" })
diff --git a/fs/open.c b/fs/open.c
index 1a325b3194df..94bef26ff1b6 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -1173,7 +1173,7 @@ struct file *filp_open(const char *filename, int flags, umode_t mode)
}
EXPORT_SYMBOL(filp_open);
-struct file *file_open_root(struct dentry *dentry, struct vfsmount *mnt,
+struct file *file_open_root(const struct path *root,
const char *filename, int flags, umode_t mode)
{
struct open_flags op;
@@ -1181,7 +1181,7 @@ struct file *file_open_root(struct dentry *dentry, struct vfsmount *mnt,
int err = build_open_flags(&how, &op);
if (err)
return ERR_PTR(err);
- return do_file_open_root(dentry, mnt, filename, &op);
+ return do_file_open_root(root, filename, &op);
}
EXPORT_SYMBOL(file_open_root);
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index dea0f5ee540c..5d66faecd4ef 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -1807,7 +1807,7 @@ static int process_sysctl_arg(char *param, char *val,
panic("%s: Failed to allocate path for %s\n", __func__, param);
strreplace(path, '.', '/');
- file = file_open_root((*proc_mnt)->mnt_root, *proc_mnt, path, O_WRONLY, 0);
+ file = file_open_root_mnt(*proc_mnt, path, O_WRONLY, 0);
if (IS_ERR(file)) {
err = PTR_ERR(file);
if (err == -ENOENT)
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 13:35:16 +0000