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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Browse source 
Pull more vfs stuff from Al Viro:
 "O_TMPFILE ABI changes, Oleg's fput() series, misc cleanups, including
  making simple_lookup() usable for filesystems with non-NULL s_d_op,
  which allows us to get rid of quite a bit of ugliness"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  sunrpc: now we can just set ->s_d_op
  cgroup: we can use simple_lookup() now
  efivarfs: we can use simple_lookup() now
  make simple_lookup() usable for filesystems that set ->s_d_op
  configfs: don't open-code d_alloc_name()
  __rpc_lookup_create_exclusive: pass string instead of qstr
  rpc_create_*_dir: don't bother with qstr
  llist: llist_add() can use llist_add_batch()
  llist: fix/simplify llist_add() and llist_add_batch()
  fput: turn "list_head delayed_fput_list" into llist_head
  fs/file_table.c:fput(): add comment
  Safer ABI for O_TMPFILE
This commit is contained in:
Linus Torvalds 2013-07-14 11:42:26 -07:00
commit 41d9884c44
18 changed files with 73 additions and 137 deletions
Download patch file Download diff file Expand all files Collapse all files

2
arch/alpha/include/uapi/asm/fcntl.h
View file

@ -32,7 +32,7 @@
#define O_SYNC (__O_SYNC|O_DSYNC)
#define O_PATH 040000000
#define O_TMPFILE 0100000000
#define __O_TMPFILE 0100000000
#define F_GETLK 7
#define F_SETLK 8

2
arch/parisc/include/uapi/asm/fcntl.h
View file

@ -20,7 +20,7 @@
#define O_INVISIBLE 004000000 /* invisible I/O, for DMAPI/XDSM */
#define O_PATH 020000000
#define O_TMPFILE 040000000
#define __O_TMPFILE 040000000
#define F_GETLK64 8
#define F_SETLK64 9

2
arch/sparc/include/uapi/asm/fcntl.h
View file

@ -35,7 +35,7 @@
#define O_SYNC (__O_SYNC|O_DSYNC)
#define O_PATH 0x1000000
#define O_TMPFILE 0x2000000
#define __O_TMPFILE 0x2000000
#define F_GETOWN 5 /* for sockets. */
#define F_SETOWN 6 /* for sockets. */

13
fs/configfs/dir.c
View file

@ -660,19 +660,15 @@ static int create_default_group(struct config_group *parent_group,
struct config_group *group)
{
int ret;
struct qstr name;
struct configfs_dirent *sd;
/* We trust the caller holds a reference to parent */
struct dentry *child, *parent = parent_group->cg_item.ci_dentry;
if (!group->cg_item.ci_name)
group->cg_item.ci_name = group->cg_item.ci_namebuf;
name.name = group->cg_item.ci_name;
name.len = strlen(name.name);
name.hash = full_name_hash(name.name, name.len);
ret = -ENOMEM;
child = d_alloc(parent, &name);
child = d_alloc_name(parent, group->cg_item.ci_name);
if (child) {
d_add(child, NULL);
@ -1650,7 +1646,6 @@ int configfs_register_subsystem(struct configfs_subsystem *subsys)
{
int err;
struct config_group *group = &subsys->su_group;
struct qstr name;
struct dentry *dentry;
struct dentry *root;
struct configfs_dirent *sd;
@ -1667,12 +1662,8 @@ int configfs_register_subsystem(struct configfs_subsystem *subsys)
mutex_lock_nested(&root->d_inode->i_mutex, I_MUTEX_PARENT);
name.name = group->cg_item.ci_name;
name.len = strlen(name.name);
name.hash = full_name_hash(name.name, name.len);
err = -ENOMEM;
dentry = d_alloc(root, &name);
dentry = d_alloc_name(root, group->cg_item.ci_name);
if (dentry) {
d_add(dentry, NULL);

14
fs/efivarfs/inode.c
View file

@ -155,20 +155,8 @@ static int efivarfs_unlink(struct inode *dir, struct dentry *dentry)
return 0;
};
/*
* Handle negative dentry.
*/
static struct dentry *efivarfs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
if (dentry->d_name.len > NAME_MAX)
return ERR_PTR(-ENAMETOOLONG);
d_add(dentry, NULL);
return NULL;
}
const struct inode_operations efivarfs_dir_inode_operations = {
.lookup = efivarfs_lookup,
.lookup = simple_lookup,
.unlink = efivarfs_unlink,
.create = efivarfs_create,
};

29
fs/file_table.c
View file

@ -265,18 +265,15 @@ static void __fput(struct file *file)
mntput(mnt);
}
static DEFINE_SPINLOCK(delayed_fput_lock);
static LIST_HEAD(delayed_fput_list);
static LLIST_HEAD(delayed_fput_list);
static void delayed_fput(struct work_struct *unused)
{
LIST_HEAD(head);
spin_lock_irq(&delayed_fput_lock);
list_splice_init(&delayed_fput_list, &head);
spin_unlock_irq(&delayed_fput_lock);
while (!list_empty(&head)) {
struct file *f = list_first_entry(&head, struct file, f_u.fu_list);
list_del_init(&f->f_u.fu_list);
__fput(f);
struct llist_node *node = llist_del_all(&delayed_fput_list);
struct llist_node *next;
for (; node; node = next) {
next = llist_next(node);
__fput(llist_entry(node, struct file, f_u.fu_llist));
}
}
@ -306,18 +303,22 @@ void fput(struct file *file)
{
if (atomic_long_dec_and_test(&file->f_count)) {
struct task_struct *task = current;
unsigned long flags;
file_sb_list_del(file);
if (likely(!in_interrupt() && !(task->flags & PF_KTHREAD))) {
init_task_work(&file->f_u.fu_rcuhead, ____fput);
if (!task_work_add(task, &file->f_u.fu_rcuhead, true))
return;
/*
* After this task has run exit_task_work(),
* task_work_add() will fail. free_ipc_ns()->
* shm_destroy() can do this. Fall through to delayed
* fput to avoid leaking *file.
*/
}
spin_lock_irqsave(&delayed_fput_lock, flags);
list_add(&file->f_u.fu_list, &delayed_fput_list);
if (llist_add(&file->f_u.fu_llist, &delayed_fput_list))
schedule_work(&delayed_fput_work);
spin_unlock_irqrestore(&delayed_fput_lock, flags);
}
}

1
fs/libfs.c
View file

@ -61,6 +61,7 @@ struct dentry *simple_lookup(struct inode *dir, struct dentry *dentry, unsigned
if (dentry->d_name.len > NAME_MAX)
return ERR_PTR(-ENAMETOOLONG);
if (!dentry->d_sb->s_d_op)
d_set_d_op(dentry, &simple_dentry_operations);
d_add(dentry, NULL);
return NULL;

2
fs/namei.c
View file

@ -2977,7 +2977,7 @@ static struct file *path_openat(int dfd, struct filename *pathname,
file->f_flags = op->open_flag;
if (unlikely(file->f_flags & O_TMPFILE)) {
if (unlikely(file->f_flags & __O_TMPFILE)) {
error = do_tmpfile(dfd, pathname, nd, flags, op, file, &opened);
goto out;
}

4
fs/open.c
View file

@ -840,8 +840,8 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o
if (flags & __O_SYNC)
flags |= O_DSYNC;
if (flags & O_TMPFILE) {
if (!(flags & O_CREAT))
if (flags & __O_TMPFILE) {
if ((flags & O_TMPFILE_MASK) != O_TMPFILE)
return -EINVAL;
acc_mode = MAY_OPEN | ACC_MODE(flags);
} else if (flags & O_PATH) {

2
include/linux/fs.h
View file

@ -10,6 +10,7 @@
#include <linux/stat.h>
#include <linux/cache.h>
#include <linux/list.h>
#include <linux/llist.h>
#include <linux/radix-tree.h>
#include <linux/rbtree.h>
#include <linux/init.h>
@ -768,6 +769,7 @@ struct file {
*/
union {
struct list_head fu_list;
struct llist_node fu_llist;
struct rcu_head fu_rcuhead;
} f_u;
struct path f_path;

19
include/linux/llist.h
View file

@ -142,6 +142,9 @@ static inline struct llist_node *llist_next(struct llist_node *node)
return node->next;
}
extern bool llist_add_batch(struct llist_node *new_first,
struct llist_node *new_last,
struct llist_head *head);
/**
* llist_add - add a new entry
* @new: new entry to be added
@ -151,18 +154,7 @@ static inline struct llist_node *llist_next(struct llist_node *node)
*/
static inline bool llist_add(struct llist_node *new, struct llist_head *head)
{
struct llist_node *entry, *old_entry;
entry = head->first;
for (;;) {
old_entry = entry;
new->next = entry;
entry = cmpxchg(&head->first, old_entry, new);
if (entry == old_entry)
break;
}
return old_entry == NULL;
return llist_add_batch(new, new, head);
}
/**
@ -178,9 +170,6 @@ static inline struct llist_node *llist_del_all(struct llist_head *head)
return xchg(&head->first, NULL);
}
extern bool llist_add_batch(struct llist_node *new_first,
struct llist_node *new_last,
struct llist_head *head);
extern struct llist_node *llist_del_first(struct llist_head *head);
#endif /* LLIST_H */

4
include/linux/sunrpc/rpc_pipe_fs.h
View file

@ -73,12 +73,12 @@ extern ssize_t rpc_pipe_generic_upcall(struct file *, struct rpc_pipe_msg *,
extern int rpc_queue_upcall(struct rpc_pipe *, struct rpc_pipe_msg *);
struct rpc_clnt;
extern struct dentry *rpc_create_client_dir(struct dentry *, struct qstr *, struct rpc_clnt *);
extern struct dentry *rpc_create_client_dir(struct dentry *, const char *, struct rpc_clnt *);
extern int rpc_remove_client_dir(struct dentry *);
struct cache_detail;
extern struct dentry *rpc_create_cache_dir(struct dentry *,
struct qstr *,
const char *,
umode_t umode,
struct cache_detail *);
extern void rpc_remove_cache_dir(struct dentry *);

8
include/uapi/asm-generic/fcntl.h
View file

@ -84,10 +84,14 @@
#define O_PATH 010000000
#endif
#ifndef O_TMPFILE
#define O_TMPFILE 020000000
#ifndef __O_TMPFILE
#define __O_TMPFILE 020000000
#endif
/* a horrid kludge trying to make sure that this will fail on old kernels */
#define O_TMPFILE (__O_TMPFILE | O_DIRECTORY | O_RDWR)
#define O_TMPFILE_MASK (__O_TMPFILE | O_DIRECTORY | O_CREAT | O_ACCMODE)
#ifndef O_NDELAY
#define O_NDELAY O_NONBLOCK
#endif

11
kernel/cgroup.c
View file

@ -802,7 +802,6 @@ static struct cgroup *task_cgroup_from_root(struct task_struct *task,
*/
static int cgroup_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
static struct dentry *cgroup_lookup(struct inode *, struct dentry *, unsigned int);
static int cgroup_rmdir(struct inode *unused_dir, struct dentry *dentry);
static int cgroup_populate_dir(struct cgroup *cgrp, bool base_files,
unsigned long subsys_mask);
@ -2642,7 +2641,7 @@ static const struct inode_operations cgroup_file_inode_operations = {
};
static const struct inode_operations cgroup_dir_inode_operations = {
.lookup = cgroup_lookup,
.lookup = simple_lookup,
.mkdir = cgroup_mkdir,
.rmdir = cgroup_rmdir,
.rename = cgroup_rename,
@ -2652,14 +2651,6 @@ static const struct inode_operations cgroup_dir_inode_operations = {
.removexattr = cgroup_removexattr,
};
static struct dentry *cgroup_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
{
if (dentry->d_name.len > NAME_MAX)
return ERR_PTR(-ENAMETOOLONG);
d_add(dentry, NULL);
return NULL;
}
/*
* Check if a file is a control file
*/

15
lib/llist.c
View file

@ -39,18 +39,13 @@
bool llist_add_batch(struct llist_node *new_first, struct llist_node *new_last,
struct llist_head *head)
{
struct llist_node *entry, *old_entry;
struct llist_node *first;
entry = head->first;
for (;;) {
old_entry = entry;
new_last->next = entry;
entry = cmpxchg(&head->first, old_entry, new_first);
if (entry == old_entry)
break;
}
do {
new_last->next = first = ACCESS_ONCE(head->first);
} while (cmpxchg(&head->first, first, new_first) != first);
return old_entry == NULL;
return !first;
}
EXPORT_SYMBOL_GPL(llist_add_batch);

16
net/sunrpc/cache.c
View file

@ -1823,19 +1823,11 @@ int sunrpc_cache_register_pipefs(struct dentry *parent,
const char *name, umode_t umode,
struct cache_detail *cd)
{
struct qstr q;
struct dentry *dir;
int ret = 0;
q.name = name;
q.len = strlen(name);
q.hash = full_name_hash(q.name, q.len);
dir = rpc_create_cache_dir(parent, &q, umode, cd);
if (!IS_ERR(dir))
struct dentry *dir = rpc_create_cache_dir(parent, name, umode, cd);
if (IS_ERR(dir))
return PTR_ERR(dir);
cd->u.pipefs.dir = dir;
else
ret = PTR_ERR(dir);
return ret;
return 0;
}
EXPORT_SYMBOL_GPL(sunrpc_cache_register_pipefs);

16
net/sunrpc/clnt.c
View file

@ -128,9 +128,7 @@ static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb,
{
static uint32_t clntid;
char name[15];
struct qstr q = { .name = name };
struct dentry *dir, *dentry;
int error;
dir = rpc_d_lookup_sb(sb, dir_name);
if (dir == NULL) {
@ -138,20 +136,18 @@ static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb,
return dir;
}
for (;;) {
q.len = snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
snprintf(name, sizeof(name), "clnt%x", (unsigned int)clntid++);
name[sizeof(name) - 1] = '\0';
q.hash = full_name_hash(q.name, q.len);
dentry = rpc_create_client_dir(dir, &q, clnt);
dentry = rpc_create_client_dir(dir, name, clnt);
if (!IS_ERR(dentry))
break;
error = PTR_ERR(dentry);
if (error != -EEXIST) {
if (dentry == ERR_PTR(-EEXIST))
continue;
printk(KERN_INFO "RPC: Couldn't create pipefs entry"
" %s/%s, error %d\n",
dir_name, name, error);
" %s/%s, error %ld\n",
dir_name, name, PTR_ERR(dentry));
break;
}
}
dput(dir);
return dentry;
}

40
net/sunrpc/rpc_pipe.c
View file

@ -673,13 +673,12 @@ static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)
}
static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
struct qstr *name)
const char *name)
{
struct dentry *dentry;
dentry = d_lookup(parent, name);
struct qstr q = QSTR_INIT(name, strlen(name));
struct dentry *dentry = d_hash_and_lookup(parent, &q);
if (!dentry) {
dentry = d_alloc(parent, name);
dentry = d_alloc(parent, &q);
if (!dentry)
return ERR_PTR(-ENOMEM);
}
@ -704,8 +703,7 @@ static void __rpc_depopulate(struct dentry *parent,
for (i = start; i < eof; i++) {
name.name = files[i].name;
name.len = strlen(files[i].name);
name.hash = full_name_hash(name.name, name.len);
dentry = d_lookup(parent, &name);
dentry = d_hash_and_lookup(parent, &name);
if (dentry == NULL)
continue;
@ -747,12 +745,7 @@ static int rpc_populate(struct dentry *parent,
mutex_lock(&dir->i_mutex);
for (i = start; i < eof; i++) {
struct qstr q;
q.name = files[i].name;
q.len = strlen(files[i].name);
q.hash = full_name_hash(q.name, q.len);
dentry = __rpc_lookup_create_exclusive(parent, &q);
dentry = __rpc_lookup_create_exclusive(parent, files[i].name);
err = PTR_ERR(dentry);
if (IS_ERR(dentry))
goto out_bad;
@ -785,7 +778,7 @@ out_bad:
}
static struct dentry *rpc_mkdir_populate(struct dentry *parent,
struct qstr *name, umode_t mode, void *private,
const char *name, umode_t mode, void *private,
int (*populate)(struct dentry *, void *), void *args_populate)
{
struct dentry *dentry;
@ -856,7 +849,6 @@ struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name,
struct dentry *dentry;
struct inode *dir = parent->d_inode;
umode_t umode = S_IFIFO | S_IRUSR | S_IWUSR;
struct qstr q;
int err;
if (pipe->ops->upcall == NULL)
@ -864,12 +856,8 @@ struct dentry *rpc_mkpipe_dentry(struct dentry *parent, const char *name,
if (pipe->ops->downcall == NULL)
umode &= ~S_IWUGO;
q.name = name;
q.len = strlen(name);
q.hash = full_name_hash(q.name, q.len),
mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
dentry = __rpc_lookup_create_exclusive(parent, &q);
dentry = __rpc_lookup_create_exclusive(parent, name);
if (IS_ERR(dentry))
goto out;
err = __rpc_mkpipe_dentry(dir, dentry, umode, &rpc_pipe_fops,
@ -940,8 +928,8 @@ static void rpc_clntdir_depopulate(struct dentry *dentry)
/**
* rpc_create_client_dir - Create a new rpc_client directory in rpc_pipefs
* @dentry: dentry from the rpc_pipefs root to the new directory
* @name: &struct qstr for the name
* @dentry: the parent of new directory
* @name: the name of new directory
* @rpc_client: rpc client to associate with this directory
*
* This creates a directory at the given @path associated with
@ -950,7 +938,7 @@ static void rpc_clntdir_depopulate(struct dentry *dentry)
* later be created using rpc_mkpipe().
*/
struct dentry *rpc_create_client_dir(struct dentry *dentry,
struct qstr *name,
const char *name,
struct rpc_clnt *rpc_client)
{
return rpc_mkdir_populate(dentry, name, S_IRUGO | S_IXUGO, NULL,
@ -996,7 +984,7 @@ static void rpc_cachedir_depopulate(struct dentry *dentry)
rpc_depopulate(dentry, cache_pipefs_files, 0, 3);
}
struct dentry *rpc_create_cache_dir(struct dentry *parent, struct qstr *name,
struct dentry *rpc_create_cache_dir(struct dentry *parent, const char *name,
umode_t umode, struct cache_detail *cd)
{
return rpc_mkdir_populate(parent, name, umode, NULL,
@ -1076,9 +1064,7 @@ struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
const unsigned char *dir_name)
{
struct qstr dir = QSTR_INIT(dir_name, strlen(dir_name));
dir.hash = full_name_hash(dir.name, dir.len);
return d_lookup(sb->s_root, &dir);
return d_hash_and_lookup(sb->s_root, &dir);
}
EXPORT_SYMBOL_GPL(rpc_d_lookup_sb);