.max_files = NR_FILE
};
-DEFINE_STATIC_LGLOCK(files_lglock);
-
/* SLAB cache for file structures */
static struct kmem_cache *filp_cachep __read_mostly;
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);
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));
}
}
{
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;
}
- spin_lock_irqsave(&delayed_fput_lock, flags);
- list_add(&file->f_u.fu_list, &delayed_fput_list);
- schedule_work(&delayed_fput_work);
- spin_unlock_irqrestore(&delayed_fput_lock, flags);
+
+ if (llist_add(&file->f_u.fu_llist, &delayed_fput_list))
+ schedule_work(&delayed_fput_work);
}
}
{
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);
}
{
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)
-{
- 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 (!S_ISREG(file_inode(f)->i_mode))
- continue;
- 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;
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);
}
projects / firefly-linux-kernel-4.4.55.git / blobdiff