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-rw-r--r--arch/ia64/kernel/perfmon.c15
-rw-r--r--fs/9p/vfs_inode.c15
-rw-r--r--fs/cachefiles/daemon.c32
-rw-r--r--fs/dcache.c188
-rw-r--r--fs/fs_struct.c7
-rw-r--r--fs/isofs/inode.c7
-rw-r--r--fs/namei.c15
-rw-r--r--fs/namespace.c6
-rw-r--r--fs/proc/base.c24
-rw-r--r--fs/sysv/super.c1
-rw-r--r--include/linux/dcache.h1
-rw-r--r--include/linux/fs_struct.h27
-rw-r--r--include/linux/mount.h1
-rw-r--r--include/linux/path.h5
-rw-r--r--kernel/auditsc.c9
15 files changed, 223 insertions, 130 deletions
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index 744329072f3..cce050e85c7 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -2191,8 +2191,15 @@ pfmfs_delete_dentry(struct dentry *dentry)
return 1;
}
+static char *pfmfs_dname(struct dentry *dentry, char *buffer, int buflen)
+{
+ return dynamic_dname(dentry, buffer, buflen, "pfm:[%lu]",
+ dentry->d_inode->i_ino);
+}
+
static const struct dentry_operations pfmfs_dentry_operations = {
.d_delete = pfmfs_delete_dentry,
+ .d_dname = pfmfs_dname,
};
@@ -2202,8 +2209,7 @@ pfm_alloc_file(pfm_context_t *ctx)
struct file *file;
struct inode *inode;
struct path path;
- char name[32];
- struct qstr this;
+ struct qstr this = { .name = "" };
/*
* allocate a new inode
@@ -2218,11 +2224,6 @@ pfm_alloc_file(pfm_context_t *ctx)
inode->i_uid = current_fsuid();
inode->i_gid = current_fsgid();
- sprintf(name, "[%lu]", inode->i_ino);
- this.name = name;
- this.len = strlen(name);
- this.hash = inode->i_ino;
-
/*
* allocate a new dcache entry
*/
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index d97c34a24f7..c7c23eab944 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1263,10 +1263,19 @@ static int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
return PTR_ERR(fid);
retval = p9_client_setattr(fid, &p9attr);
- if (retval >= 0)
- retval = inode_setattr(dentry->d_inode, iattr);
+ if (retval < 0)
+ return retval;
- return retval;
+ if ((iattr->ia_valid & ATTR_SIZE) &&
+ iattr->ia_size != i_size_read(dentry->d_inode)) {
+ retval = vmtruncate(dentry->d_inode, iattr->ia_size);
+ if (retval)
+ return retval;
+ }
+
+ setattr_copy(dentry->d_inode, iattr);
+ mark_inode_dirty(dentry->d_inode);
+ return 0;
}
/**
diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
index 24eb0d37241..727caedcdd9 100644
--- a/fs/cachefiles/daemon.c
+++ b/fs/cachefiles/daemon.c
@@ -552,8 +552,7 @@ static int cachefiles_daemon_tag(struct cachefiles_cache *cache, char *args)
*/
static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args)
{
- struct fs_struct *fs;
- struct dentry *dir;
+ struct path path;
const struct cred *saved_cred;
int ret;
@@ -573,24 +572,21 @@ static int cachefiles_daemon_cull(struct cachefiles_cache *cache, char *args)
}
/* extract the directory dentry from the cwd */
- fs = current->fs;
- read_lock(&fs->lock);
- dir = dget(fs->pwd.dentry);
- read_unlock(&fs->lock);
+ get_fs_pwd(current->fs, &path);
- if (!S_ISDIR(dir->d_inode->i_mode))
+ if (!S_ISDIR(path.dentry->d_inode->i_mode))
goto notdir;
cachefiles_begin_secure(cache, &saved_cred);
- ret = cachefiles_cull(cache, dir, args);
+ ret = cachefiles_cull(cache, path.dentry, args);
cachefiles_end_secure(cache, saved_cred);
- dput(dir);
+ path_put(&path);
_leave(" = %d", ret);
return ret;
notdir:
- dput(dir);
+ path_put(&path);
kerror("cull command requires dirfd to be a directory");
return -ENOTDIR;
@@ -628,8 +624,7 @@ inval:
*/
static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)
{
- struct fs_struct *fs;
- struct dentry *dir;
+ struct path path;
const struct cred *saved_cred;
int ret;
@@ -649,24 +644,21 @@ static int cachefiles_daemon_inuse(struct cachefiles_cache *cache, char *args)
}
/* extract the directory dentry from the cwd */
- fs = current->fs;
- read_lock(&fs->lock);
- dir = dget(fs->pwd.dentry);
- read_unlock(&fs->lock);
+ get_fs_pwd(current->fs, &path);
- if (!S_ISDIR(dir->d_inode->i_mode))
+ if (!S_ISDIR(path.dentry->d_inode->i_mode))
goto notdir;
cachefiles_begin_secure(cache, &saved_cred);
- ret = cachefiles_check_in_use(cache, dir, args);
+ ret = cachefiles_check_in_use(cache, path.dentry, args);
cachefiles_end_secure(cache, saved_cred);
- dput(dir);
+ path_put(&path);
//_leave(" = %d", ret);
return ret;
notdir:
- dput(dir);
+ path_put(&path);
kerror("inuse command requires dirfd to be a directory");
return -ENOTDIR;
diff --git a/fs/dcache.c b/fs/dcache.c
index 9f2c1341796..166d35d5686 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1905,48 +1905,30 @@ static int prepend_name(char **buffer, int *buflen, struct qstr *name)
}
/**
- * __d_path - return the path of a dentry
+ * Prepend path string to a buffer
+ *
* @path: the dentry/vfsmount to report
* @root: root vfsmnt/dentry (may be modified by this function)
- * @buffer: buffer to return value in
- * @buflen: buffer length
+ * @buffer: pointer to the end of the buffer
+ * @buflen: pointer to buffer length
*
- * Convert a dentry into an ASCII path name. If the entry has been deleted
- * the string " (deleted)" is appended. Note that this is ambiguous.
- *
- * Returns a pointer into the buffer or an error code if the
- * path was too long.
- *
- * "buflen" should be positive. Caller holds the dcache_lock.
+ * Caller holds the dcache_lock.
*
* If path is not reachable from the supplied root, then the value of
* root is changed (without modifying refcounts).
*/
-char *__d_path(const struct path *path, struct path *root,
- char *buffer, int buflen)
+static int prepend_path(const struct path *path, struct path *root,
+ char **buffer, int *buflen)
{
struct dentry *dentry = path->dentry;
struct vfsmount *vfsmnt = path->mnt;
- char *end = buffer + buflen;
- char *retval;
+ bool slash = false;
+ int error = 0;
spin_lock(&vfsmount_lock);
- prepend(&end, &buflen, "\0", 1);
- if (d_unlinked(dentry) &&
- (prepend(&end, &buflen, " (deleted)", 10) != 0))
- goto Elong;
-
- if (buflen < 1)
- goto Elong;
- /* Get '/' right */
- retval = end-1;
- *retval = '/';
-
- for (;;) {
+ while (dentry != root->dentry || vfsmnt != root->mnt) {
struct dentry * parent;
- if (dentry == root->dentry && vfsmnt == root->mnt)
- break;
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) {
/* Global root? */
if (vfsmnt->mnt_parent == vfsmnt) {
@@ -1958,28 +1940,88 @@ char *__d_path(const struct path *path, struct path *root,
}
parent = dentry->d_parent;
prefetch(parent);
- if ((prepend_name(&end, &buflen, &dentry->d_name) != 0) ||
- (prepend(&end, &buflen, "/", 1) != 0))
- goto Elong;
- retval = end;
+ error = prepend_name(buffer, buflen, &dentry->d_name);
+ if (!error)
+ error = prepend(buffer, buflen, "/", 1);
+ if (error)
+ break;
+
+ slash = true;
dentry = parent;
}
out:
+ if (!error && !slash)
+ error = prepend(buffer, buflen, "/", 1);
+
spin_unlock(&vfsmount_lock);
- return retval;
+ return error;
global_root:
- retval += 1; /* hit the slash */
- if (prepend_name(&retval, &buflen, &dentry->d_name) != 0)
- goto Elong;
+ /*
+ * Filesystems needing to implement special "root names"
+ * should do so with ->d_dname()
+ */
+ if (IS_ROOT(dentry) &&
+ (dentry->d_name.len != 1 || dentry->d_name.name[0] != '/')) {
+ WARN(1, "Root dentry has weird name <%.*s>\n",
+ (int) dentry->d_name.len, dentry->d_name.name);
+ }
root->mnt = vfsmnt;
root->dentry = dentry;
goto out;
+}
-Elong:
- retval = ERR_PTR(-ENAMETOOLONG);
- goto out;
+/**
+ * __d_path - return the path of a dentry
+ * @path: the dentry/vfsmount to report
+ * @root: root vfsmnt/dentry (may be modified by this function)
+ * @buffer: buffer to return value in
+ * @buflen: buffer length
+ *
+ * Convert a dentry into an ASCII path name.
+ *
+ * Returns a pointer into the buffer or an error code if the
+ * path was too long.
+ *
+ * "buflen" should be positive. Caller holds the dcache_lock.
+ *
+ * If path is not reachable from the supplied root, then the value of
+ * root is changed (without modifying refcounts).
+ */
+char *__d_path(const struct path *path, struct path *root,
+ char *buf, int buflen)
+{
+ char *res = buf + buflen;
+ int error;
+
+ prepend(&res, &buflen, "\0", 1);
+ error = prepend_path(path, root, &res, &buflen);
+ if (error)
+ return ERR_PTR(error);
+
+ return res;
+}
+
+/*
+ * same as __d_path but appends "(deleted)" for unlinked files.
+ */
+static int path_with_deleted(const struct path *path, struct path *root,
+ char **buf, int *buflen)
+{
+ prepend(buf, buflen, "\0", 1);
+ if (d_unlinked(path->dentry)) {
+ int error = prepend(buf, buflen, " (deleted)", 10);
+ if (error)
+ return error;
+ }
+
+ return prepend_path(path, root, buf, buflen);
+}
+
+static int prepend_unreachable(char **buffer, int *buflen)
+{
+ return prepend(buffer, buflen, "(unreachable)", 13);
}
/**
@@ -2000,9 +2042,10 @@ Elong:
*/
char *d_path(const struct path *path, char *buf, int buflen)
{
- char *res;
+ char *res = buf + buflen;
struct path root;
struct path tmp;
+ int error;
/*
* We have various synthetic filesystems that never get mounted. On
@@ -2014,19 +2057,51 @@ char *d_path(const struct path *path, char *buf, int buflen)
if (path->dentry->d_op && path->dentry->d_op->d_dname)
return path->dentry->d_op->d_dname(path->dentry, buf, buflen);
- read_lock(&current->fs->lock);
- root = current->fs->root;
- path_get(&root);
- read_unlock(&current->fs->lock);
+ get_fs_root(current->fs, &root);
spin_lock(&dcache_lock);
tmp = root;
- res = __d_path(path, &tmp, buf, buflen);
+ error = path_with_deleted(path, &tmp, &res, &buflen);
+ if (error)
+ res = ERR_PTR(error);
spin_unlock(&dcache_lock);
path_put(&root);
return res;
}
EXPORT_SYMBOL(d_path);
+/**
+ * d_path_with_unreachable - return the path of a dentry
+ * @path: path to report
+ * @buf: buffer to return value in
+ * @buflen: buffer length
+ *
+ * The difference from d_path() is that this prepends "(unreachable)"
+ * to paths which are unreachable from the current process' root.
+ */
+char *d_path_with_unreachable(const struct path *path, char *buf, int buflen)
+{
+ char *res = buf + buflen;
+ struct path root;
+ struct path tmp;
+ int error;
+
+ if (path->dentry->d_op && path->dentry->d_op->d_dname)
+ return path->dentry->d_op->d_dname(path->dentry, buf, buflen);
+
+ get_fs_root(current->fs, &root);
+ spin_lock(&dcache_lock);
+ tmp = root;
+ error = path_with_deleted(path, &tmp, &res, &buflen);
+ if (!error && !path_equal(&tmp, &root))
+ error = prepend_unreachable(&res, &buflen);
+ spin_unlock(&dcache_lock);
+ path_put(&root);
+ if (error)
+ res = ERR_PTR(error);
+
+ return res;
+}
+
/*
* Helper function for dentry_operations.d_dname() members
*/
@@ -2129,27 +2204,30 @@ SYSCALL_DEFINE2(getcwd, char __user *, buf, unsigned long, size)
if (!page)
return -ENOMEM;
- read_lock(&current->fs->lock);
- pwd = current->fs->pwd;
- path_get(&pwd);
- root = current->fs->root;
- path_get(&root);
- read_unlock(&current->fs->lock);
+ get_fs_root_and_pwd(current->fs, &root, &pwd);
error = -ENOENT;
spin_lock(&dcache_lock);
if (!d_unlinked(pwd.dentry)) {
unsigned long len;
struct path tmp = root;
- char * cwd;
+ char *cwd = page + PAGE_SIZE;
+ int buflen = PAGE_SIZE;
- cwd = __d_path(&pwd, &tmp, page, PAGE_SIZE);
+ prepend(&cwd, &buflen, "\0", 1);
+ error = prepend_path(&pwd, &tmp, &cwd, &buflen);
spin_unlock(&dcache_lock);
- error = PTR_ERR(cwd);
- if (IS_ERR(cwd))
+ if (error)
goto out;
+ /* Unreachable from current root */
+ if (!path_equal(&tmp, &root)) {
+ error = prepend_unreachable(&cwd, &buflen);
+ if (error)
+ goto out;
+ }
+
error = -ERANGE;
len = PAGE_SIZE + page - cwd;
if (len <= size) {
diff --git a/fs/fs_struct.c b/fs/fs_struct.c
index eee059052db..1ee40eb9a2c 100644
--- a/fs/fs_struct.c
+++ b/fs/fs_struct.c
@@ -106,12 +106,7 @@ struct fs_struct *copy_fs_struct(struct fs_struct *old)
fs->in_exec = 0;
rwlock_init(&fs->lock);
fs->umask = old->umask;
- read_lock(&old->lock);
- fs->root = old->root;
- path_get(&old->root);
- fs->pwd = old->pwd;
- path_get(&old->pwd);
- read_unlock(&old->lock);
+ get_fs_root_and_pwd(old, &fs->root, &fs->pwd);
}
return fs;
}
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 6b4dcd4f294..5a44811b502 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -722,7 +722,12 @@ root_found:
}
s->s_magic = ISOFS_SUPER_MAGIC;
- s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
+
+ /*
+ * With multi-extent files, file size is only limited by the maximum
+ * size of a file system, which is 8 TB.
+ */
+ s->s_maxbytes = 0x80000000000LL;
/*
* The CDROM is read-only, has no nodes (devices) on it, and since
diff --git a/fs/namei.c b/fs/namei.c
index 13ff4abdbdc..17ea76bf2fb 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -483,13 +483,8 @@ ok:
static __always_inline void set_root(struct nameidata *nd)
{
- if (!nd->root.mnt) {
- struct fs_struct *fs = current->fs;
- read_lock(&fs->lock);
- nd->root = fs->root;
- path_get(&nd->root);
- read_unlock(&fs->lock);
- }
+ if (!nd->root.mnt)
+ get_fs_root(current->fs, &nd->root);
}
static int link_path_walk(const char *, struct nameidata *);
@@ -1015,11 +1010,7 @@ static int path_init(int dfd, const char *name, unsigned int flags, struct namei
nd->path = nd->root;
path_get(&nd->root);
} else if (dfd == AT_FDCWD) {
- struct fs_struct *fs = current->fs;
- read_lock(&fs->lock);
- nd->path = fs->pwd;
- path_get(&fs->pwd);
- read_unlock(&fs->lock);
+ get_fs_pwd(current->fs, &nd->path);
} else {
struct dentry *dentry;
diff --git a/fs/namespace.c b/fs/namespace.c
index 66c4f7e781c..2e10cb19c5b 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -788,7 +788,6 @@ static void show_mnt_opts(struct seq_file *m, struct vfsmount *mnt)
{ MNT_NOATIME, ",noatime" },
{ MNT_NODIRATIME, ",nodiratime" },
{ MNT_RELATIME, ",relatime" },
- { MNT_STRICTATIME, ",strictatime" },
{ 0, NULL }
};
const struct proc_fs_info *fs_infop;
@@ -2213,10 +2212,7 @@ SYSCALL_DEFINE2(pivot_root, const char __user *, new_root,
goto out1;
}
- read_lock(&current->fs->lock);
- root = current->fs->root;
- path_get(&current->fs->root);
- read_unlock(&current->fs->lock);
+ get_fs_root(current->fs, &root);
down_write(&namespace_sem);
mutex_lock(&old.dentry->d_inode->i_mutex);
error = -EINVAL;
diff --git a/fs/proc/base.c b/fs/proc/base.c
index c806dfb24e0..a1c43e7c8a7 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -149,18 +149,13 @@ static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
return count;
}
-static int get_fs_path(struct task_struct *task, struct path *path, bool root)
+static int get_task_root(struct task_struct *task, struct path *root)
{
- struct fs_struct *fs;
int result = -ENOENT;
task_lock(task);
- fs = task->fs;
- if (fs) {
- read_lock(&fs->lock);
- *path = root ? fs->root : fs->pwd;
- path_get(path);
- read_unlock(&fs->lock);
+ if (task->fs) {
+ get_fs_root(task->fs, root);
result = 0;
}
task_unlock(task);
@@ -173,7 +168,12 @@ static int proc_cwd_link(struct inode *inode, struct path *path)
int result = -ENOENT;
if (task) {
- result = get_fs_path(task, path, 0);
+ task_lock(task);
+ if (task->fs) {
+ get_fs_pwd(task->fs, path);
+ result = 0;
+ }
+ task_unlock(task);
put_task_struct(task);
}
return result;
@@ -185,7 +185,7 @@ static int proc_root_link(struct inode *inode, struct path *path)
int result = -ENOENT;
if (task) {
- result = get_fs_path(task, path, 1);
+ result = get_task_root(task, path);
put_task_struct(task);
}
return result;
@@ -597,7 +597,7 @@ static int mounts_open_common(struct inode *inode, struct file *file,
get_mnt_ns(ns);
}
rcu_read_unlock();
- if (ns && get_fs_path(task, &root, 1) == 0)
+ if (ns && get_task_root(task, &root) == 0)
ret = 0;
put_task_struct(task);
}
@@ -1526,7 +1526,7 @@ static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
if (!tmp)
return -ENOMEM;
- pathname = d_path(path, tmp, PAGE_SIZE);
+ pathname = d_path_with_unreachable(path, tmp, PAGE_SIZE);
len = PTR_ERR(pathname);
if (IS_ERR(pathname))
goto out;
diff --git a/fs/sysv/super.c b/fs/sysv/super.c
index 85359a8df60..a0b0cda6927 100644
--- a/fs/sysv/super.c
+++ b/fs/sysv/super.c
@@ -24,7 +24,6 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/buffer_head.h>
-#include <linux/parser.h>
#include "sysv.h"
/*
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index d23be0386e2..6a4aea30aa0 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -315,6 +315,7 @@ extern char *dynamic_dname(struct dentry *, char *, int, const char *, ...);
extern char *__d_path(const struct path *path, struct path *root, char *, int);
extern char *d_path(const struct path *, char *, int);
+extern char *d_path_with_unreachable(const struct path *, char *, int);
extern char *__dentry_path(struct dentry *, char *, int);
extern char *dentry_path(struct dentry *, char *, int);
diff --git a/include/linux/fs_struct.h b/include/linux/fs_struct.h
index 78a05bfcd8e..eca3d520213 100644
--- a/include/linux/fs_struct.h
+++ b/include/linux/fs_struct.h
@@ -21,4 +21,31 @@ extern void free_fs_struct(struct fs_struct *);
extern void daemonize_fs_struct(void);
extern int unshare_fs_struct(void);
+static inline void get_fs_root(struct fs_struct *fs, struct path *root)
+{
+ read_lock(&fs->lock);
+ *root = fs->root;
+ path_get(root);
+ read_unlock(&fs->lock);
+}
+
+static inline void get_fs_pwd(struct fs_struct *fs, struct path *pwd)
+{
+ read_lock(&fs->lock);
+ *pwd = fs->pwd;
+ path_get(pwd);
+ read_unlock(&fs->lock);
+}
+
+static inline void get_fs_root_and_pwd(struct fs_struct *fs, struct path *root,
+ struct path *pwd)
+{
+ read_lock(&fs->lock);
+ *root = fs->root;
+ path_get(root);
+ *pwd = fs->pwd;
+ path_get(pwd);
+ read_unlock(&fs->lock);
+}
+
#endif /* _LINUX_FS_STRUCT_H */
diff --git a/include/linux/mount.h b/include/linux/mount.h
index 907210bd9f9..5e7a59408dd 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -27,7 +27,6 @@ struct mnt_namespace;
#define MNT_NODIRATIME 0x10
#define MNT_RELATIME 0x20
#define MNT_READONLY 0x40 /* does the user want this to be r/o? */
-#define MNT_STRICTATIME 0x80
#define MNT_SHRINKABLE 0x100
#define MNT_WRITE_HOLD 0x200
diff --git a/include/linux/path.h b/include/linux/path.h
index 915e0c382a5..edc98dec626 100644
--- a/include/linux/path.h
+++ b/include/linux/path.h
@@ -12,4 +12,9 @@ struct path {
extern void path_get(struct path *);
extern void path_put(struct path *);
+static inline int path_equal(const struct path *path1, const struct path *path2)
+{
+ return path1->mnt == path2->mnt && path1->dentry == path2->dentry;
+}
+
#endif /* _LINUX_PATH_H */
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index b87a63beb66..1b31c130d03 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1835,13 +1835,8 @@ void __audit_getname(const char *name)
context->names[context->name_count].ino = (unsigned long)-1;
context->names[context->name_count].osid = 0;
++context->name_count;
- if (!context->pwd.dentry) {
- read_lock(&current->fs->lock);
- context->pwd = current->fs->pwd;
- path_get(&current->fs->pwd);
- read_unlock(&current->fs->lock);
- }
-
+ if (!context->pwd.dentry)
+ get_fs_pwd(current->fs, &context->pwd);
}
/* audit_putname - intercept a putname request
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-24 01:07:42 +0000