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Message-Id: <f22f4b1a32f9a21e6f54f8cde4a34a60024a2a12.1438076484.git.jslaby@suse.cz>
Date: Tue, 28 Jul 2015 11:43:26 +0200
From: Jiri Slaby <jslaby@...e.cz>
To: stable@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
Jiri Slaby <jslaby@...e.com>
Subject: [PATCH 3.12 072/124] get rid of s_files and files_lock
From: Al Viro <viro@...iv.linux.org.uk>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit eee5cc2702929fd41cce28058dc6d6717f723f87 upstream.
The only thing we need it for is alt-sysrq-r (emergency remount r/o)
and these days we can do just as well without going through the
list of files.
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Jiri Slaby <jslaby@...e.com>
---
fs/file_table.c | 125 -----------------------------------------------------
fs/internal.h | 3 --
fs/open.c | 2 -
fs/super.c | 15 +------
include/linux/fs.h | 13 ------
5 files changed, 2 insertions(+), 156 deletions(-)
diff --git a/fs/file_table.c b/fs/file_table.c
index 05e2ac19b6c4..8070f81a3286 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -36,8 +36,6 @@ struct files_stat_struct files_stat = {
.max_files = NR_FILE
};
-DEFINE_STATIC_LGLOCK(files_lglock);
-
/* SLAB cache for file structures */
static struct kmem_cache *filp_cachep __read_mostly;
@@ -134,7 +132,6 @@ struct file *get_empty_filp(void)
return ERR_PTR(error);
}
- INIT_LIST_HEAD(&f->f_u.fu_list);
atomic_long_set(&f->f_count, 1);
rwlock_init(&f->f_owner.lock);
spin_lock_init(&f->f_lock);
@@ -304,7 +301,6 @@ void fput(struct file *file)
if (atomic_long_dec_and_test(&file->f_count)) {
struct task_struct *task = current;
- 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))
@@ -333,7 +329,6 @@ void __fput_sync(struct file *file)
{
if (atomic_long_dec_and_test(&file->f_count)) {
struct task_struct *task = current;
- file_sb_list_del(file);
BUG_ON(!(task->flags & PF_KTHREAD));
__fput(file);
}
@@ -345,129 +340,10 @@ void put_filp(struct file *file)
{
if (atomic_long_dec_and_test(&file->f_count)) {
security_file_free(file);
- file_sb_list_del(file);
file_free(file);
}
}
-static inline int file_list_cpu(struct file *file)
-{
-#ifdef CONFIG_SMP
- return file->f_sb_list_cpu;
-#else
- return smp_processor_id();
-#endif
-}
-
-/* helper for file_sb_list_add to reduce ifdefs */
-static inline void __file_sb_list_add(struct file *file, struct super_block *sb)
-{
- struct list_head *list;
-#ifdef CONFIG_SMP
- int cpu;
- cpu = smp_processor_id();
- file->f_sb_list_cpu = cpu;
- list = per_cpu_ptr(sb->s_files, cpu);
-#else
- list = &sb->s_files;
-#endif
- list_add(&file->f_u.fu_list, list);
-}
-
-/**
- * file_sb_list_add - add a file to the sb's file list
- * @file: file to add
- * @sb: sb to add it to
- *
- * Use this function to associate a file with the superblock of the inode it
- * refers to.
- */
-void file_sb_list_add(struct file *file, struct super_block *sb)
-{
- if (likely(!(file->f_mode & FMODE_WRITE)))
- return;
- if (!S_ISREG(file_inode(file)->i_mode))
- return;
- lg_local_lock(&files_lglock);
- __file_sb_list_add(file, sb);
- lg_local_unlock(&files_lglock);
-}
-
-/**
- * file_sb_list_del - remove a file from the sb's file list
- * @file: file to remove
- * @sb: sb to remove it from
- *
- * Use this function to remove a file from its superblock.
- */
-void file_sb_list_del(struct file *file)
-{
- if (!list_empty(&file->f_u.fu_list)) {
- lg_local_lock_cpu(&files_lglock, file_list_cpu(file));
- list_del_init(&file->f_u.fu_list);
- lg_local_unlock_cpu(&files_lglock, file_list_cpu(file));
- }
-}
-
-#ifdef CONFIG_SMP
-
-/*
- * These macros iterate all files on all CPUs for a given superblock.
- * files_lglock must be held globally.
- */
-#define do_file_list_for_each_entry(__sb, __file) \
-{ \
- int i; \
- for_each_possible_cpu(i) { \
- struct list_head *list; \
- list = per_cpu_ptr((__sb)->s_files, i); \
- list_for_each_entry((__file), list, f_u.fu_list)
-
-#define while_file_list_for_each_entry \
- } \
-}
-
-#else
-
-#define do_file_list_for_each_entry(__sb, __file) \
-{ \
- struct list_head *list; \
- list = &(sb)->s_files; \
- list_for_each_entry((__file), list, f_u.fu_list)
-
-#define while_file_list_for_each_entry \
-}
-
-#endif
-
-/**
- * mark_files_ro - mark all files read-only
- * @sb: superblock in question
- *
- * All files are marked read-only. We don't care about pending
- * delete files so this should be used in 'force' mode only.
- */
-void mark_files_ro(struct super_block *sb)
-{
- struct file *f;
-
- lg_global_lock(&files_lglock);
- do_file_list_for_each_entry(sb, f) {
- if (!file_count(f))
- continue;
- if (!(f->f_mode & FMODE_WRITE))
- continue;
- spin_lock(&f->f_lock);
- f->f_mode &= ~FMODE_WRITE;
- spin_unlock(&f->f_lock);
- if (file_check_writeable(f) != 0)
- continue;
- __mnt_drop_write(f->f_path.mnt);
- file_release_write(f);
- } while_file_list_for_each_entry;
- lg_global_unlock(&files_lglock);
-}
-
void __init files_init(unsigned long mempages)
{
unsigned long n;
@@ -483,6 +359,5 @@ void __init files_init(unsigned long mempages)
n = (mempages * (PAGE_SIZE / 1024)) / 10;
files_stat.max_files = max_t(unsigned long, n, NR_FILE);
files_defer_init();
- lg_lock_init(&files_lglock, "files_lglock");
percpu_counter_init(&nr_files, 0);
}
diff --git a/fs/internal.h b/fs/internal.h
index 6026fc0fbae0..656bcd4b281f 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -77,9 +77,6 @@ extern void chroot_fs_refs(const struct path *, const struct path *);
/*
* file_table.c
*/
-extern void file_sb_list_add(struct file *f, struct super_block *sb);
-extern void file_sb_list_del(struct file *f);
-extern void mark_files_ro(struct super_block *);
extern struct file *get_empty_filp(void);
/*
diff --git a/fs/open.c b/fs/open.c
index 730a5870895d..fc9c0ceed464 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -673,7 +673,6 @@ static int do_dentry_open(struct file *f,
}
f->f_mapping = inode->i_mapping;
- file_sb_list_add(f, inode->i_sb);
if (unlikely(f->f_mode & FMODE_PATH)) {
f->f_op = &empty_fops;
@@ -708,7 +707,6 @@ static int do_dentry_open(struct file *f,
cleanup_all:
fops_put(f->f_op);
- file_sb_list_del(f);
if (f->f_mode & FMODE_WRITE) {
if (!special_file(inode->i_mode)) {
/*
diff --git a/fs/super.c b/fs/super.c
index 59c6983682b2..e3406833d82f 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -146,9 +146,6 @@ static void destroy_super(struct super_block *s)
int i;
list_lru_destroy(&s->s_dentry_lru);
list_lru_destroy(&s->s_inode_lru);
-#ifdef CONFIG_SMP
- free_percpu(s->s_files);
-#endif
for (i = 0; i < SB_FREEZE_LEVELS; i++)
percpu_counter_destroy(&s->s_writers.counter[i]);
security_sb_free(s);
@@ -178,15 +175,6 @@ static struct super_block *alloc_super(struct file_system_type *type, int flags)
if (security_sb_alloc(s))
goto fail;
-#ifdef CONFIG_SMP
- s->s_files = alloc_percpu(struct list_head);
- if (!s->s_files)
- goto fail;
- for_each_possible_cpu(i)
- INIT_LIST_HEAD(per_cpu_ptr(s->s_files, i));
-#else
- INIT_LIST_HEAD(&s->s_files);
-#endif
for (i = 0; i < SB_FREEZE_LEVELS; i++) {
if (percpu_counter_init(&s->s_writers.counter[i], 0) < 0)
goto fail;
@@ -726,7 +714,8 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
make sure there are no rw files opened */
if (remount_ro) {
if (force) {
- mark_files_ro(sb);
+ sb->s_readonly_remount = 1;
+ smp_wmb();
} else {
retval = sb_prepare_remount_readonly(sb);
if (retval)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 9cb726aa09fc..042b61b7a2ad 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -764,12 +764,7 @@ static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
#define FILE_MNT_WRITE_RELEASED 2
struct file {
- /*
- * fu_list becomes invalid after file_free is called and queued via
- * fu_rcuhead for RCU freeing
- */
union {
- struct list_head fu_list;
struct llist_node fu_llist;
struct rcu_head fu_rcuhead;
} f_u;
@@ -783,9 +778,6 @@ struct file {
* Must not be taken from IRQ context.
*/
spinlock_t f_lock;
-#ifdef CONFIG_SMP
- int f_sb_list_cpu;
-#endif
atomic_long_t f_count;
unsigned int f_flags;
fmode_t f_mode;
@@ -1264,11 +1256,6 @@ struct super_block {
struct list_head s_inodes; /* all inodes */
struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */
-#ifdef CONFIG_SMP
- struct list_head __percpu *s_files;
-#else
- struct list_head s_files;
-#endif
struct list_head s_mounts; /* list of mounts; _not_ for fs use */
struct block_device *s_bdev;
struct backing_dev_info *s_bdi;
--
2.4.6
--
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