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fs: allow for more than 2^31 files

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Robin Holt tried to boot a 16TB system and found af_unix was overflowing
a 32bit value :

<quote>

We were seeing a failure which prevented boot.  The kernel was incapable
of creating either a named pipe or unix domain socket.  This comes down
to a common kernel function called unix_create1() which does:

        atomic_inc(&unix_nr_socks);
        if (atomic_read(&unix_nr_socks) > 2 * get_max_files())
                goto out;

The function get_max_files() is a simple return of files_stat.max_files.
files_stat.max_files is a signed integer and is computed in
fs/file_table.c's files_init().

        n = (mempages * (PAGE_SIZE / 1024)) / 10;
        files_stat.max_files = n;

In our case, mempages (total_ram_pages) is approx 3,758,096,384
(0xe0000000).  That leaves max_files at approximately 1,503,238,553.
This causes 2 * get_max_files() to integer overflow.

</quote>

Fix is to let /proc/sys/fs/file-nr & /proc/sys/fs/file-max use long
integers, and change af_unix to use an atomic_long_t instead of atomic_t.

get_max_files() is changed to return an unsigned long.  get_nr_files() is
changed to return a long.

unix_nr_socks is changed from atomic_t to atomic_long_t, while not
strictly needed to address Robin problem.

Before patch (on a 64bit kernel) :
# echo 2147483648 >/proc/sys/fs/file-max
# cat /proc/sys/fs/file-max
-18446744071562067968

After patch:
# echo 2147483648 >/proc/sys/fs/file-max
# cat /proc/sys/fs/file-max
2147483648
# cat /proc/sys/fs/file-nr
704     0       2147483648

Reported-by: Robin Holt <holt@sgi.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: David Miller <davem@davemloft.net>
Reviewed-by: Robin Holt <holt@sgi.com>
Tested-by: Robin Holt <holt@sgi.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Dumazet 2010-10-26 14:22:44 -07:00 • committed by Linus Torvalds
commit 518de9b39e
4 changed files with 21 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

17
fs/file_table.c
View file

@ -60,7 +60,7 @@ static inline void file_free(struct file *f)
/*
* Return the total number of open files in the system
*/
static int get_nr_files(void)
static long get_nr_files(void)
{
return percpu_counter_read_positive(&nr_files);
}
@ -68,7 +68,7 @@ static int get_nr_files(void)
/*
* Return the maximum number of open files in the system
*/
int get_max_files(void)
unsigned long get_max_files(void)
{
return files_stat.max_files;
}
@ -82,7 +82,7 @@ int proc_nr_files(ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
files_stat.nr_files = get_nr_files();
return proc_dointvec(table, write, buffer, lenp, ppos);
return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
}
#else
int proc_nr_files(ctl_table *table, int write,
@ -105,7 +105,7 @@ int proc_nr_files(ctl_table *table, int write,
struct file *get_empty_filp(void)
{
const struct cred *cred = current_cred();
static int old_max;
static long old_max;
struct file * f;
/*
@ -140,8 +140,7 @@ struct file *get_empty_filp(void)
over:
/* Ran out of filps - report that */
if (get_nr_files() > old_max) {
printk(KERN_INFO "VFS: file-max limit %d reached\n",
get_max_files());
pr_info("VFS: file-max limit %lu reached\n", get_max_files());
old_max = get_nr_files();
}
goto fail;
@ -487,7 +486,7 @@ retry:
void __init files_init(unsigned long mempages)
{
int n;
unsigned long n;
filp_cachep = kmem_cache_create("filp", sizeof(struct file), 0,
SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
@ -498,9 +497,7 @@ void __init files_init(unsigned long mempages)
*/
n = (mempages * (PAGE_SIZE / 1024)) / 10;
files_stat.max_files = n;
if (files_stat.max_files < NR_FILE)
files_stat.max_files = NR_FILE;
files_stat.max_files = max_t(unsigned long, n, NR_FILE);
files_defer_init();
lg_lock_init(files_lglock);
percpu_counter_init(&nr_files, 0);

8
include/linux/fs.h
View file

@ -34,9 +34,9 @@
/* And dynamically-tunable limits and defaults: */
struct files_stat_struct {
int nr_files; /* read only */
int nr_free_files; /* read only */
int max_files; /* tunable */
unsigned long nr_files; /* read only */
unsigned long nr_free_files; /* read only */
unsigned long max_files; /* tunable */
};
struct inodes_stat_t {
@ -400,7 +400,7 @@ extern void __init inode_init_early(void);
extern void __init files_init(unsigned long);
extern struct files_stat_struct files_stat;
extern int get_max_files(void);
extern unsigned long get_max_files(void);
extern int sysctl_nr_open;
extern struct inodes_stat_t inodes_stat;
extern int leases_enable, lease_break_time;

6
kernel/sysctl.c
View file

@ -1352,16 +1352,16 @@ static struct ctl_table fs_table[] = {
{
.procname = "file-nr",
.data = &files_stat,
.maxlen = 3*sizeof(int),
.maxlen = sizeof(files_stat),
.mode = 0444,
.proc_handler = proc_nr_files,
},
{
.procname = "file-max",
.data = &files_stat.max_files,
.maxlen = sizeof(int),
.maxlen = sizeof(files_stat.max_files),
.mode = 0644,
.proc_handler = proc_dointvec,
.proc_handler = proc_doulongvec_minmax,
},
{
.procname = "nr_open",

14
net/unix/af_unix.c
View file

@ -117,7 +117,7 @@
static struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
static DEFINE_SPINLOCK(unix_table_lock);
static atomic_t unix_nr_socks = ATOMIC_INIT(0);
static atomic_long_t unix_nr_socks;
#define unix_sockets_unbound (&unix_socket_table[UNIX_HASH_SIZE])
@ -360,13 +360,13 @@ static void unix_sock_destructor(struct sock *sk)
if (u->addr)
unix_release_addr(u->addr);
atomic_dec(&unix_nr_socks);
atomic_long_dec(&unix_nr_socks);
local_bh_disable();
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
local_bh_enable();
#ifdef UNIX_REFCNT_DEBUG
printk(KERN_DEBUG "UNIX %p is destroyed, %d are still alive.\n", sk,
atomic_read(&unix_nr_socks));
printk(KERN_DEBUG "UNIX %p is destroyed, %ld are still alive.\n", sk,
atomic_long_read(&unix_nr_socks));
#endif
}
@ -606,8 +606,8 @@ static struct sock *unix_create1(struct net *net, struct socket *sock)
struct sock *sk = NULL;
struct unix_sock *u;
atomic_inc(&unix_nr_socks);
if (atomic_read(&unix_nr_socks) > 2 * get_max_files())
atomic_long_inc(&unix_nr_socks);
if (atomic_long_read(&unix_nr_socks) > 2 * get_max_files())
goto out;
sk = sk_alloc(net, PF_UNIX, GFP_KERNEL, &unix_proto);
@ -632,7 +632,7 @@ static struct sock *unix_create1(struct net *net, struct socket *sock)
unix_insert_socket(unix_sockets_unbound, sk);
out:
if (sk == NULL)
atomic_dec(&unix_nr_socks);
atomic_long_dec(&unix_nr_socks);
else {
local_bh_disable();
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);