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-rw-r--r--fs/file_table.c89
1 files changed, 60 insertions, 29 deletions
diff --git a/fs/file_table.c b/fs/file_table.c
index 45437f8e1003..dd88701e54a9 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -27,13 +27,14 @@
#include <linux/task_work.h>
#include <linux/ima.h>
#include <linux/swap.h>
+#include <linux/kmemleak.h>
#include <linux/atomic.h>
#include "internal.h"
/* sysctl tunables... */
-struct files_stat_struct files_stat = {
+static struct files_stat_struct files_stat = {
.max_files = NR_FILE
};
@@ -44,7 +45,7 @@ static struct percpu_counter nr_files __cacheline_aligned_in_smp;
static void file_free_rcu(struct rcu_head *head)
{
- struct file *f = container_of(head, struct file, f_u.fu_rcuhead);
+ struct file *f = container_of(head, struct file, f_rcuhead);
put_cred(f->f_cred);
kmem_cache_free(filp_cachep, f);
@@ -55,7 +56,7 @@ static inline void file_free(struct file *f)
security_file_free(f);
if (!(f->f_mode & FMODE_NOACCOUNT))
percpu_counter_dec(&nr_files);
- call_rcu(&f->f_u.fu_rcuhead, file_free_rcu);
+ call_rcu(&f->f_rcuhead, file_free_rcu);
}
/*
@@ -75,22 +76,58 @@ unsigned long get_max_files(void)
}
EXPORT_SYMBOL_GPL(get_max_files);
+#if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
+
/*
* Handle nr_files sysctl
*/
-#if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
-int proc_nr_files(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
+static int proc_nr_files(struct ctl_table *table, int write, void *buffer,
+ size_t *lenp, loff_t *ppos)
{
files_stat.nr_files = get_nr_files();
return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
}
-#else
-int proc_nr_files(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
+
+static struct ctl_table fs_stat_sysctls[] = {
+ {
+ .procname = "file-nr",
+ .data = &files_stat,
+ .maxlen = sizeof(files_stat),
+ .mode = 0444,
+ .proc_handler = proc_nr_files,
+ },
+ {
+ .procname = "file-max",
+ .data = &files_stat.max_files,
+ .maxlen = sizeof(files_stat.max_files),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ .extra1 = SYSCTL_LONG_ZERO,
+ .extra2 = SYSCTL_LONG_MAX,
+ },
+ {
+ .procname = "nr_open",
+ .data = &sysctl_nr_open,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &sysctl_nr_open_min,
+ .extra2 = &sysctl_nr_open_max,
+ },
+ { }
+};
+
+static int __init init_fs_stat_sysctls(void)
{
- return -ENOSYS;
+ register_sysctl_init("fs", fs_stat_sysctls);
+ if (IS_ENABLED(CONFIG_BINFMT_MISC)) {
+ struct ctl_table_header *hdr;
+ hdr = register_sysctl_mount_point("fs/binfmt_misc");
+ kmemleak_not_leak(hdr);
+ }
+ return 0;
}
+fs_initcall(init_fs_stat_sysctls);
#endif
static struct file *__alloc_file(int flags, const struct cred *cred)
@@ -105,7 +142,7 @@ static struct file *__alloc_file(int flags, const struct cred *cred)
f->f_cred = get_cred(cred);
error = security_file_alloc(f);
if (unlikely(error)) {
- file_free_rcu(&f->f_u.fu_rcuhead);
+ file_free_rcu(&f->f_rcuhead);
return ERR_PTR(error);
}
@@ -198,12 +235,15 @@ static struct file *alloc_file(const struct path *path, int flags,
file->f_mapping = path->dentry->d_inode->i_mapping;
file->f_wb_err = filemap_sample_wb_err(file->f_mapping);
file->f_sb_err = file_sample_sb_err(file);
+ if (fop->llseek)
+ file->f_mode |= FMODE_LSEEK;
if ((file->f_mode & FMODE_READ) &&
likely(fop->read || fop->read_iter))
file->f_mode |= FMODE_CAN_READ;
if ((file->f_mode & FMODE_WRITE) &&
likely(fop->write || fop->write_iter))
file->f_mode |= FMODE_CAN_WRITE;
+ file->f_iocb_flags = iocb_flags(file);
file->f_mode |= FMODE_OPENED;
file->f_op = fop;
if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
@@ -284,12 +324,7 @@ static void __fput(struct file *file)
}
fops_put(file->f_op);
put_pid(file->f_owner.pid);
- if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
- i_readcount_dec(inode);
- if (mode & FMODE_WRITER) {
- put_write_access(inode);
- __mnt_drop_write(mnt);
- }
+ put_file_access(file);
dput(dentry);
if (unlikely(mode & FMODE_NEED_UNMOUNT))
dissolve_on_fput(mnt);
@@ -304,13 +339,13 @@ static void delayed_fput(struct work_struct *unused)
struct llist_node *node = llist_del_all(&delayed_fput_list);
struct file *f, *t;
- llist_for_each_entry_safe(f, t, node, f_u.fu_llist)
+ llist_for_each_entry_safe(f, t, node, f_llist)
__fput(f);
}
static void ____fput(struct callback_head *work)
{
- __fput(container_of(work, struct file, f_u.fu_rcuhead));
+ __fput(container_of(work, struct file, f_rcuhead));
}
/*
@@ -331,14 +366,14 @@ EXPORT_SYMBOL_GPL(flush_delayed_fput);
static DECLARE_DELAYED_WORK(delayed_fput_work, delayed_fput);
-void fput_many(struct file *file, unsigned int refs)
+void fput(struct file *file)
{
- if (atomic_long_sub_and_test(refs, &file->f_count)) {
+ if (atomic_long_dec_and_test(&file->f_count)) {
struct task_struct *task = current;
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, TWA_RESUME))
+ init_task_work(&file->f_rcuhead, ____fput);
+ if (!task_work_add(task, &file->f_rcuhead, TWA_RESUME))
return;
/*
* After this task has run exit_task_work(),
@@ -347,16 +382,11 @@ void fput_many(struct file *file, unsigned int refs)
*/
}
- if (llist_add(&file->f_u.fu_llist, &delayed_fput_list))
+ if (llist_add(&file->f_llist, &delayed_fput_list))
schedule_delayed_work(&delayed_fput_work, 1);
}
}
-void fput(struct file *file)
-{
- fput_many(file, 1);
-}
-
/*
* synchronous analog of fput(); for kernel threads that might be needed
* in some umount() (and thus can't use flush_delayed_fput() without
@@ -375,6 +405,7 @@ void __fput_sync(struct file *file)
}
EXPORT_SYMBOL(fput);
+EXPORT_SYMBOL(__fput_sync);
void __init files_init(void)
{
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.