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-rw-r--r--arch/alpha/kernel/osf_sys.c4
-rw-r--r--arch/ia64/kernel/perfmon.c7
-rw-r--r--arch/sparc64/solaris/ioctl.c8
-rw-r--r--drivers/char/tty_io.c4
-rw-r--r--fs/exec.c8
-rw-r--r--fs/fcntl.c47
-rw-r--r--fs/file.c42
-rw-r--r--fs/locks.c8
-rw-r--r--fs/open.c41
-rw-r--r--fs/proc/array.c5
-rw-r--r--fs/proc/base.c4
-rw-r--r--fs/select.c12
-rw-r--r--include/linux/file.h23
-rw-r--r--include/linux/init_task.h13
-rw-r--r--kernel/exit.c21
-rw-r--r--kernel/fork.c82
-rw-r--r--security/selinux/hooks.c6
17 files changed, 211 insertions, 124 deletions
diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index 167fd89f8707..2b034182a0ca 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -974,6 +974,7 @@ osf_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp,
size_t size;
long timeout;
int ret = -EINVAL;
+ struct fdtable *fdt;
timeout = MAX_SCHEDULE_TIMEOUT;
if (tvp) {
@@ -995,7 +996,8 @@ osf_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp,
}
}
- if (n < 0 || n > current->files->max_fdset)
+ fdt = files_fdtable(current->files);
+ if (n < 0 || n > fdt->max_fdset)
goto out_nofds;
/*
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index f1201ac8a116..4ad97b3b39dc 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -38,6 +38,7 @@
#include <linux/pagemap.h>
#include <linux/mount.h>
#include <linux/bitops.h>
+#include <linux/rcupdate.h>
#include <asm/errno.h>
#include <asm/intrinsics.h>
@@ -2217,15 +2218,17 @@ static void
pfm_free_fd(int fd, struct file *file)
{
struct files_struct *files = current->files;
+ struct fdtable *fdt = files_fdtable(files);
/*
* there ie no fd_uninstall(), so we do it here
*/
spin_lock(&files->file_lock);
- files->fd[fd] = NULL;
+ rcu_assign_pointer(fdt->fd[fd], NULL);
spin_unlock(&files->file_lock);
- if (file) put_filp(file);
+ if (file)
+ put_filp(file);
put_unused_fd(fd);
}
diff --git a/arch/sparc64/solaris/ioctl.c b/arch/sparc64/solaris/ioctl.c
index cac0a1cf0050..374766455f5e 100644
--- a/arch/sparc64/solaris/ioctl.c
+++ b/arch/sparc64/solaris/ioctl.c
@@ -293,11 +293,13 @@ static struct module_info {
static inline int solaris_sockmod(unsigned int fd, unsigned int cmd, u32 arg)
{
struct inode *ino;
+ struct fdtable *fdt;
/* I wonder which of these tests are superfluous... --patrik */
spin_lock(&current->files->file_lock);
- if (! current->files->fd[fd] ||
- ! current->files->fd[fd]->f_dentry ||
- ! (ino = current->files->fd[fd]->f_dentry->d_inode) ||
+ fdt = files_fdtable(current->files);
+ if (! fdt->fd[fd] ||
+ ! fdt->fd[fd]->f_dentry ||
+ ! (ino = fdt->fd[fd]->f_dentry->d_inode) ||
! S_ISSOCK(ino->i_mode)) {
spin_unlock(&current->files->file_lock);
return TBADF;
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 6a56ae4f7725..0bfc7af68917 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -2454,6 +2454,7 @@ static void __do_SAK(void *arg)
int i;
struct file *filp;
struct tty_ldisc *disc;
+ struct fdtable *fdt;
if (!tty)
return;
@@ -2480,7 +2481,8 @@ static void __do_SAK(void *arg)
task_lock(p);
if (p->files) {
spin_lock(&p->files->file_lock);
- for (i=0; i < p->files->max_fds; i++) {
+ fdt = files_fdtable(p->files);
+ for (i=0; i < fdt->max_fds; i++) {
filp = fcheck_files(p->files, i);
if (!filp)
continue;
diff --git a/fs/exec.c b/fs/exec.c
index 222ab1c572d8..14dd03907ccb 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -798,6 +798,7 @@ no_thread_group:
static inline void flush_old_files(struct files_struct * files)
{
long j = -1;
+ struct fdtable *fdt;
spin_lock(&files->file_lock);
for (;;) {
@@ -805,12 +806,13 @@ static inline void flush_old_files(struct files_struct * files)
j++;
i = j * __NFDBITS;
- if (i >= files->max_fds || i >= files->max_fdset)
+ fdt = files_fdtable(files);
+ if (i >= fdt->max_fds || i >= fdt->max_fdset)
break;
- set = files->close_on_exec->fds_bits[j];
+ set = fdt->close_on_exec->fds_bits[j];
if (!set)
continue;
- files->close_on_exec->fds_bits[j] = 0;
+ fdt->close_on_exec->fds_bits[j] = 0;
spin_unlock(&files->file_lock);
for ( ; set ; i++,set >>= 1) {
if (set & 1) {
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 6fbc9d8fcc36..bfecc6238083 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -24,20 +24,24 @@
void fastcall set_close_on_exec(unsigned int fd, int flag)
{
struct files_struct *files = current->files;
+ struct fdtable *fdt;
spin_lock(&files->file_lock);
+ fdt = files_fdtable(files);
if (flag)
- FD_SET(fd, files->close_on_exec);
+ FD_SET(fd, fdt->close_on_exec);
else
- FD_CLR(fd, files->close_on_exec);
+ FD_CLR(fd, fdt->close_on_exec);
spin_unlock(&files->file_lock);
}
static inline int get_close_on_exec(unsigned int fd)
{
struct files_struct *files = current->files;
+ struct fdtable *fdt;
int res;
spin_lock(&files->file_lock);
- res = FD_ISSET(fd, files->close_on_exec);
+ fdt = files_fdtable(files);
+ res = FD_ISSET(fd, fdt->close_on_exec);
spin_unlock(&files->file_lock);
return res;
}
@@ -54,24 +58,26 @@ static int locate_fd(struct files_struct *files,
unsigned int newfd;
unsigned int start;
int error;
+ struct fdtable *fdt;
error = -EINVAL;
if (orig_start >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur)
goto out;
+ fdt = files_fdtable(files);
repeat:
/*
* Someone might have closed fd's in the range
- * orig_start..files->next_fd
+ * orig_start..fdt->next_fd
*/
start = orig_start;
- if (start < files->next_fd)
- start = files->next_fd;
+ if (start < fdt->next_fd)
+ start = fdt->next_fd;
newfd = start;
- if (start < files->max_fdset) {
- newfd = find_next_zero_bit(files->open_fds->fds_bits,
- files->max_fdset, start);
+ if (start < fdt->max_fdset) {
+ newfd = find_next_zero_bit(fdt->open_fds->fds_bits,
+ fdt->max_fdset, start);
}
error = -EMFILE;
@@ -89,8 +95,8 @@ repeat:
if (error)
goto repeat;
- if (start <= files->next_fd)
- files->next_fd = newfd + 1;
+ if (start <= fdt->next_fd)
+ fdt->next_fd = newfd + 1;
error = newfd;
@@ -101,13 +107,16 @@ out:
static int dupfd(struct file *file, unsigned int start)
{
struct files_struct * files = current->files;
+ struct fdtable *fdt;
int fd;
spin_lock(&files->file_lock);
fd = locate_fd(files, file, start);
if (fd >= 0) {
- FD_SET(fd, files->open_fds);
- FD_CLR(fd, files->close_on_exec);
+ /* locate_fd() may have expanded fdtable, load the ptr */
+ fdt = files_fdtable(files);
+ FD_SET(fd, fdt->open_fds);
+ FD_CLR(fd, fdt->close_on_exec);
spin_unlock(&files->file_lock);
fd_install(fd, file);
} else {
@@ -123,6 +132,7 @@ asmlinkage long sys_dup2(unsigned int oldfd, unsigned int newfd)
int err = -EBADF;
struct file * file, *tofree;
struct files_struct * files = current->files;
+ struct fdtable *fdt;
spin_lock(&files->file_lock);
if (!(file = fcheck(oldfd)))
@@ -148,13 +158,14 @@ asmlinkage long sys_dup2(unsigned int oldfd, unsigned int newfd)
/* Yes. It's a race. In user space. Nothing sane to do */
err = -EBUSY;
- tofree = files->fd[newfd];
- if (!tofree && FD_ISSET(newfd, files->open_fds))
+ fdt = files_fdtable(files);
+ tofree = fdt->fd[newfd];
+ if (!tofree && FD_ISSET(newfd, fdt->open_fds))
goto out_fput;
- files->fd[newfd] = file;
- FD_SET(newfd, files->open_fds);
- FD_CLR(newfd, files->close_on_exec);
+ fdt->fd[newfd] = file;
+ FD_SET(newfd, fdt->open_fds);
+ FD_CLR(newfd, fdt->close_on_exec);
spin_unlock(&files->file_lock);
if (tofree)
diff --git a/fs/file.c b/fs/file.c
index 92b5f25985d2..f5926ce73f37 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -59,13 +59,15 @@ static int expand_fd_array(struct files_struct *files, int nr)
{
struct file **new_fds;
int error, nfds;
+ struct fdtable *fdt;
error = -EMFILE;
- if (files->max_fds >= NR_OPEN || nr >= NR_OPEN)
+ fdt = files_fdtable(files);
+ if (fdt->max_fds >= NR_OPEN || nr >= NR_OPEN)
goto out;
- nfds = files->max_fds;
+ nfds = fdt->max_fds;
spin_unlock(&files->file_lock);
/*
@@ -95,13 +97,14 @@ static int expand_fd_array(struct files_struct *files, int nr)
goto out;
/* Copy the existing array and install the new pointer */
+ fdt = files_fdtable(files);
- if (nfds > files->max_fds) {
+ if (nfds > fdt->max_fds) {
struct file **old_fds;
int i;
- old_fds = xchg(&files->fd, new_fds);
- i = xchg(&files->max_fds, nfds);
+ old_fds = xchg(&fdt->fd, new_fds);
+ i = xchg(&fdt->max_fds, nfds);
/* Don't copy/clear the array if we are creating a new
fd array for fork() */
@@ -164,12 +167,14 @@ static int expand_fdset(struct files_struct *files, int nr)
{
fd_set *new_openset = NULL, *new_execset = NULL;
int error, nfds = 0;
+ struct fdtable *fdt;
error = -EMFILE;
- if (files->max_fdset >= NR_OPEN || nr >= NR_OPEN)
+ fdt = files_fdtable(files);
+ if (fdt->max_fdset >= NR_OPEN || nr >= NR_OPEN)
goto out;
- nfds = files->max_fdset;
+ nfds = fdt->max_fdset;
spin_unlock(&files->file_lock);
/* Expand to the max in easy steps */
@@ -193,24 +198,25 @@ static int expand_fdset(struct files_struct *files, int nr)
error = 0;
/* Copy the existing tables and install the new pointers */
- if (nfds > files->max_fdset) {
- int i = files->max_fdset / (sizeof(unsigned long) * 8);
- int count = (nfds - files->max_fdset) / 8;
+ fdt = files_fdtable(files);
+ if (nfds > fdt->max_fdset) {
+ int i = fdt->max_fdset / (sizeof(unsigned long) * 8);
+ int count = (nfds - fdt->max_fdset) / 8;
/*
* Don't copy the entire array if the current fdset is
* not yet initialised.
*/
if (i) {
- memcpy (new_openset, files->open_fds, files->max_fdset/8);
- memcpy (new_execset, files->close_on_exec, files->max_fdset/8);
+ memcpy (new_openset, fdt->open_fds, fdt->max_fdset/8);
+ memcpy (new_execset, fdt->close_on_exec, fdt->max_fdset/8);
memset (&new_openset->fds_bits[i], 0, count);
memset (&new_execset->fds_bits[i], 0, count);
}
- nfds = xchg(&files->max_fdset, nfds);
- new_openset = xchg(&files->open_fds, new_openset);
- new_execset = xchg(&files->close_on_exec, new_execset);
+ nfds = xchg(&fdt->max_fdset, nfds);
+ new_openset = xchg(&fdt->open_fds, new_openset);
+ new_execset = xchg(&fdt->close_on_exec, new_execset);
spin_unlock(&files->file_lock);
free_fdset (new_openset, nfds);
free_fdset (new_execset, nfds);
@@ -237,13 +243,15 @@ out:
int expand_files(struct files_struct *files, int nr)
{
int err, expand = 0;
+ struct fdtable *fdt;
- if (nr >= files->max_fdset) {
+ fdt = files_fdtable(files);
+ if (nr >= fdt->max_fdset) {
expand = 1;
if ((err = expand_fdset(files, nr)))
goto out;
}
- if (nr >= files->max_fds) {
+ if (nr >= fdt->max_fds) {
expand = 1;
if ((err = expand_fd_array(files, nr)))
goto out;
diff --git a/fs/locks.c b/fs/locks.c
index 11956b6179ff..c2c09b4798d6 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -2198,21 +2198,23 @@ void steal_locks(fl_owner_t from)
{
struct files_struct *files = current->files;
int i, j;
+ struct fdtable *fdt;
if (from == files)
return;
lock_kernel();
j = 0;
+ fdt = files_fdtable(files);
for (;;) {
unsigned long set;
i = j * __NFDBITS;
- if (i >= files->max_fdset || i >= files->max_fds)
+ if (i >= fdt->max_fdset || i >= fdt->max_fds)
break;
- set = files->open_fds->fds_bits[j++];
+ set = fdt->open_fds->fds_bits[j++];
while (set) {
if (set & 1) {
- struct file *file = files->fd[i];
+ struct file *file = fdt->fd[i];
if (file)
__steal_locks(file, from);
}
diff --git a/fs/open.c b/fs/open.c
index 4ee2dcc31c28..b6542516a0ca 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -842,14 +842,16 @@ int get_unused_fd(void)
{
struct files_struct * files = current->files;
int fd, error;
+ struct fdtable *fdt;
error = -EMFILE;
spin_lock(&files->file_lock);
repeat:
- fd = find_next_zero_bit(files->open_fds->fds_bits,
- files->max_fdset,
- files->next_fd);
+ fdt = files_fdtable(files);
+ fd = find_next_zero_bit(fdt->open_fds->fds_bits,
+ fdt->max_fdset,
+ fdt->next_fd);
/*
* N.B. For clone tasks sharing a files structure, this test
@@ -872,14 +874,14 @@ repeat:
goto repeat;
}
- FD_SET(fd, files->open_fds);
- FD_CLR(fd, files->close_on_exec);
- files->next_fd = fd + 1;
+ FD_SET(fd, fdt->open_fds);
+ FD_CLR(fd, fdt->close_on_exec);
+ fdt->next_fd = fd + 1;
#if 1
/* Sanity check */
- if (files->fd[fd] != NULL) {
+ if (fdt->fd[fd] != NULL) {
printk(KERN_WARNING "get_unused_fd: slot %d not NULL!\n", fd);
- files->fd[fd] = NULL;
+ fdt->fd[fd] = NULL;
}
#endif
error = fd;
@@ -893,9 +895,10 @@ EXPORT_SYMBOL(get_unused_fd);
static inline void __put_unused_fd(struct files_struct *files, unsigned int fd)
{
- __FD_CLR(fd, files->open_fds);
- if (fd < files->next_fd)
- files->next_fd = fd;
+ struct fdtable *fdt = files_fdtable(files);
+ __FD_CLR(fd, fdt->open_fds);
+ if (fd < fdt->next_fd)
+ fdt->next_fd = fd;
}
void fastcall put_unused_fd(unsigned int fd)
@@ -924,10 +927,12 @@ EXPORT_SYMBOL(put_unused_fd);
void fastcall fd_install(unsigned int fd, struct file * file)
{
struct files_struct *files = current->files;
+ struct fdtable *fdt;
spin_lock(&files->file_lock);
- if (unlikely(files->fd[fd] != NULL))
+ fdt = files_fdtable(files);
+ if (unlikely(fdt->fd[fd] != NULL))
BUG();
- files->fd[fd] = file;
+ fdt->fd[fd] = file;
spin_unlock(&files->file_lock);
}
@@ -1010,15 +1015,17 @@ asmlinkage long sys_close(unsigned int fd)
{
struct file * filp;
struct files_struct *files = current->files;
+ struct fdtable *fdt;
spin_lock(&files->file_lock);
- if (fd >= files->max_fds)
+ fdt = files_fdtable(files);
+ if (fd >= fdt->max_fds)
goto out_unlock;
- filp = files->fd[fd];
+ filp = fdt->fd[fd];
if (!filp)
goto out_unlock;
- files->fd[fd] = NULL;
- FD_CLR(fd, files->close_on_exec);
+ fdt->fd[fd] = NULL;
+ FD_CLR(fd, fdt->close_on_exec);
__put_unused_fd(files, fd);
spin_unlock(&files->file_lock);
return filp_close(filp, files);
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 37668fe998ad..d88d518d30f6 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -159,6 +159,7 @@ static inline char * task_state(struct task_struct *p, char *buffer)
{
struct group_info *group_info;
int g;
+ struct fdtable *fdt = NULL;
read_lock(&tasklist_lock);
buffer += sprintf(buffer,
@@ -179,10 +180,12 @@ static inline char * task_state(struct task_struct *p, char *buffer)
p->gid, p->egid, p->sgid, p->fsgid);
read_unlock(&tasklist_lock);
task_lock(p);
+ if (p->files)
+ fdt = files_fdtable(p->files);
buffer += sprintf(buffer,
"FDSize:\t%d\n"
"Groups:\t",
- p->files ? p->files->max_fds : 0);
+ fdt ? fdt->max_fds : 0);
group_info = p->group_info;
get_group_info(group_info);
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 84751f3f52d5..d0087a0b024b 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1039,6 +1039,7 @@ static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir)
int retval;
char buf[NUMBUF];
struct files_struct * files;
+ struct fdtable *fdt;
retval = -ENOENT;
if (!pid_alive(p))
@@ -1062,8 +1063,9 @@ static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir)
if (!files)
goto out;
spin_lock(&files->file_lock);
+ fdt = files_fdtable(files);
for (fd = filp->f_pos-2;
- fd < files->max_fds;
+ fd < fdt->max_fds;
fd++, filp->f_pos++) {
unsigned int i,j;
diff --git a/fs/select.c b/fs/select.c
index b80e7eb0ac0d..2e56325c73c4 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -132,11 +132,13 @@ static int max_select_fd(unsigned long n, fd_set_bits *fds)
unsigned long *open_fds;
unsigned long set;
int max;
+ struct fdtable *fdt;
/* handle last in-complete long-word first */
set = ~(~0UL << (n & (__NFDBITS-1)));
n /= __NFDBITS;
- open_fds = current->files->open_fds->fds_bits+n;
+ fdt = files_fdtable(current->files);
+ open_fds = fdt->open_fds->fds_bits+n;
max = 0;
if (set) {
set &= BITS(fds, n);
@@ -299,6 +301,7 @@ sys_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, s
char *bits;
long timeout;
int ret, size, max_fdset;
+ struct fdtable *fdt;
timeout = MAX_SCHEDULE_TIMEOUT;
if (tvp) {
@@ -326,7 +329,8 @@ sys_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, s
goto out_nofds;
/* max_fdset can increase, so grab it once to avoid race */
- max_fdset = current->files->max_fdset;
+ fdt = files_fdtable(current->files);
+ max_fdset = fdt->max_fdset;
if (n > max_fdset)
n = max_fdset;
@@ -464,9 +468,11 @@ asmlinkage long sys_poll(struct pollfd __user * ufds, unsigned int nfds, long ti
unsigned int i;
struct poll_list *head;
struct poll_list *walk;
+ struct fdtable *fdt;
/* Do a sanity check on nfds ... */
- if (nfds > current->files->max_fdset && nfds > OPEN_MAX)
+ fdt = files_fdtable(current->files);
+ if (nfds > fdt->max_fdset && nfds > OPEN_MAX)
return -EINVAL;
if (timeout) {
diff --git a/include/linux/file.h b/include/linux/file.h
index 5206beb9a80e..db372230848e 100644
--- a/include/linux/file.h
+++ b/include/linux/file.h
@@ -16,23 +16,29 @@
*/
#define NR_OPEN_DEFAULT BITS_PER_LONG
+struct fdtable {
+ unsigned int max_fds;
+ int max_fdset;
+ int next_fd;
+ struct file ** fd; /* current fd array */
+ fd_set *close_on_exec;
+ fd_set *open_fds;
+};
+
/*
* Open file table structure
*/
struct files_struct {
atomic_t count;
spinlock_t file_lock; /* Protects all the below members. Nests inside tsk->alloc_lock */
- int max_fds;
- int max_fdset;
- int next_fd;
- struct file ** fd; /* current fd array */
- fd_set *close_on_exec;
- fd_set *open_fds;
+ struct fdtable fdtab;
fd_set close_on_exec_init;
fd_set open_fds_init;
struct file * fd_array[NR_OPEN_DEFAULT];
};
+#define files_fdtable(files) (&(files)->fdtab)
+
extern void FASTCALL(__fput(struct file *));
extern void FASTCALL(fput(struct file *));
@@ -63,9 +69,10 @@ extern int expand_files(struct files_struct *, int nr);
static inline struct file * fcheck_files(struct files_struct *files, unsigned int fd)
{
struct file * file = NULL;
+ struct fdtable *fdt = files_fdtable(files);
- if (fd < files->max_fds)
- file = files->fd[fd];
+ if (fd < fdt->max_fds)
+ file = fdt->fd[fd];
return file;
}
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index c727c195a91a..94aefa54a1b5 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -3,16 +3,21 @@
#include <linux/file.h>
-#define INIT_FILES \
-{ \
- .count = ATOMIC_INIT(1), \
- .file_lock = SPIN_LOCK_UNLOCKED, \
+#define INIT_FDTABLE \
+{ \
.max_fds = NR_OPEN_DEFAULT, \
.max_fdset = __FD_SETSIZE, \
.next_fd = 0, \
.fd = &init_files.fd_array[0], \
.close_on_exec = &init_files.close_on_exec_init, \
.open_fds = &init_files.open_fds_init, \
+}
+
+#define INIT_FILES \
+{ \
+ .count = ATOMIC_INIT(1), \
+ .file_lock = SPIN_LOCK_UNLOCKED, \
+ .fdtab = INIT_FDTABLE, \
.close_on_exec_init = { { 0, } }, \
.open_fds_init = { { 0, } }, \
.fd_array = { NULL, } \
diff --git a/kernel/exit.c b/kernel/exit.c
index 5b0fb9f09f21..83beb1e93b18 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -368,17 +368,19 @@ EXPORT_SYMBOL(daemonize);
static inline void close_files(struct files_struct * files)
{
int i, j;
+ struct fdtable *fdt;
j = 0;
+ fdt = files_fdtable(files);
for (;;) {
unsigned long set;
i = j * __NFDBITS;
- if (i >= files->max_fdset || i >= files->max_fds)
+ if (i >= fdt->max_fdset || i >= fdt->max_fds)
break;
- set = files->open_fds->fds_bits[j++];
+ set = fdt->open_fds->fds_bits[j++];
while (set) {
if (set & 1) {
- struct file * file = xchg(&files->fd[i], NULL);
+ struct file * file = xchg(&fdt->fd[i], NULL);
if (file)
filp_close(file, files);
}
@@ -403,16 +405,19 @@ struct files_struct *get_files_struct(struct task_struct *task)
void fastcall put_files_struct(struct files_struct *files)
{
+ struct fdtable *fdt;
+
if (atomic_dec_and_test(&files->count)) {
close_files(files);
/*
* Free the fd and fdset arrays if we expanded them.
*/
- if (files->fd != &files->fd_array[0])
- free_fd_array(files->fd, files->max_fds);
- if (files->max_fdset > __FD_SETSIZE) {
- free_fdset(files->open_fds, files->max_fdset);
- free_fdset(files->close_on_exec, files->max_fdset);
+ fdt = files_fdtable(files);
+ if (fdt->fd != &files->fd_array[0])
+ free_fd_array(fdt->fd, fdt->max_fds);
+ if (fdt->max_fdset > __FD_SETSIZE) {
+ free_fdset(fdt->open_fds, fdt->max_fdset);
+ free_fdset(fdt->close_on_exec, fdt->max_fdset);
}
kmem_cache_free(files_cachep, files);
}
diff --git a/kernel/fork.c b/kernel/fork.c
index b25802065031..ecc694debb50 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -568,21 +568,47 @@ static inline int copy_fs(unsigned long clone_flags, struct task_struct * tsk)
static int count_open_files(struct files_struct *files, int size)
{
int i;
+ struct fdtable *fdt;
/* Find the last open fd */
+ fdt = files_fdtable(files);
for (i = size/(8*sizeof(long)); i > 0; ) {
- if (files->open_fds->fds_bits[--i])
+ if (fdt->open_fds->fds_bits[--i])
break;
}
i = (i+1) * 8 * sizeof(long);
return i;
}
+static struct files_struct *alloc_files(void)
+{
+ struct files_struct *newf;
+ struct fdtable *fdt;
+
+ newf = kmem_cache_alloc(files_cachep, SLAB_KERNEL);
+ if (!newf)
+ goto out;
+
+ atomic_set(&newf->count, 1);
+
+ spin_lock_init(&newf->file_lock);
+ fdt = files_fdtable(newf);
+ fdt->next_fd = 0;
+ fdt->max_fds = NR_OPEN_DEFAULT;
+ fdt->max_fdset = __FD_SETSIZE;
+ fdt->close_on_exec = &newf->close_on_exec_init;
+ fdt->open_fds = &newf->open_fds_init;
+ fdt->fd = &newf->fd_array[0];
+out:
+ return newf;
+}
+
static int copy_files(unsigned long clone_flags, struct task_struct * tsk)
{
struct files_struct *oldf, *newf;
struct file **old_fds, **new_fds;
int open_files, size, i, error = 0, expand;
+ struct fdtable *old_fdt, *new_fdt;
/*
* A background process may not have any files ...
@@ -603,35 +629,27 @@ static int copy_files(unsigned long clone_flags, struct task_struct * tsk)
*/
tsk->files = NULL;
error = -ENOMEM;
- newf = kmem_cache_alloc(files_cachep, SLAB_KERNEL);
- if (!newf)
+ newf = alloc_files();
+ if (!newf)
goto out;
- atomic_set(&newf->count, 1);
-
- spin_lock_init(&newf->file_lock);
- newf->next_fd = 0;
- newf->max_fds = NR_OPEN_DEFAULT;
- newf->max_fdset = __FD_SETSIZE;
- newf->close_on_exec = &newf->close_on_exec_init;
- newf->open_fds = &newf->open_fds_init;
- newf->fd = &newf->fd_array[0];
-
spin_lock(&oldf->file_lock);
-
- open_files = count_open_files(oldf, oldf->max_fdset);
+ old_fdt = files_fdtable(oldf);
+ new_fdt = files_fdtable(newf);
+ size = old_fdt->max_fdset;
+ open_files = count_open_files(oldf, old_fdt->max_fdset);
expand = 0;
/*
* Check whether we need to allocate a larger fd array or fd set.
* Note: we're not a clone task, so the open count won't change.
*/
- if (open_files > newf->max_fdset) {
- newf->max_fdset = 0;
+ if (open_files > new_fdt->max_fdset) {
+ new_fdt->max_fdset = 0;
expand = 1;
}
- if (open_files > newf->max_fds) {
- newf->max_fds = 0;
+ if (open_files > new_fdt->max_fds) {
+ new_fdt->max_fds = 0;
expand = 1;
}
@@ -646,11 +664,11 @@ static int copy_files(unsigned long clone_flags, struct task_struct * tsk)
spin_lock(&oldf->file_lock);
}
- old_fds = oldf->fd;
- new_fds = newf->fd;
+ old_fds = old_fdt->fd;
+ new_fds = new_fdt->fd;
- memcpy(newf->open_fds->fds_bits, oldf->open_fds->fds_bits, open_files/8);
- memcpy(newf->close_on_exec->fds_bits, oldf->close_on_exec->fds_bits, open_files/8);
+ memcpy(new_fdt->open_fds->fds_bits, old_fdt->open_fds->fds_bits, open_files/8);
+ memcpy(new_fdt->close_on_exec->fds_bits, old_fdt->close_on_exec->fds_bits, open_files/8);
for (i = open_files; i != 0; i--) {
struct file *f = *old_fds++;
@@ -663,24 +681,24 @@ static int copy_files(unsigned long clone_flags, struct task_struct * tsk)
* is partway through open(). So make sure that this
* fd is available to the new process.
*/
- FD_CLR(open_files - i, newf->open_fds);
+ FD_CLR(open_files - i, new_fdt->open_fds);
}
*new_fds++ = f;
}
spin_unlock(&oldf->file_lock);
/* compute the remainder to be cleared */
- size = (newf->max_fds - open_files) * sizeof(struct file *);
+ size = (new_fdt->max_fds - open_files) * sizeof(struct file *);
/* This is long word aligned thus could use a optimized version */
memset(new_fds, 0, size);
- if (newf->max_fdset > open_files) {
- int left = (newf->max_fdset-open_files)/8;
+ if (new_fdt->max_fdset > open_files) {
+ int left = (new_fdt->max_fdset-open_files)/8;
int start = open_files / (8 * sizeof(unsigned long));
- memset(&newf->open_fds->fds_bits[start], 0, left);
- memset(&newf->close_on_exec->fds_bits[start], 0, left);
+ memset(&new_fdt->open_fds->fds_bits[start], 0, left);
+ memset(&new_fdt->close_on_exec->fds_bits[start], 0, left);
}
tsk->files = newf;
@@ -689,9 +707,9 @@ out:
return error;
out_release:
- free_fdset (newf->close_on_exec, newf->max_fdset);
- free_fdset (newf->open_fds, newf->max_fdset);
- free_fd_array(newf->fd, newf->max_fds);
+ free_fdset (new_fdt->close_on_exec, new_fdt->max_fdset);
+ free_fdset (new_fdt->open_fds, new_fdt->max_fdset);
+ free_fd_array(new_fdt->fd, new_fdt->max_fds);
kmem_cache_free(files_cachep, newf);
goto out;
}
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 3f0b533be92c..acb5a495a902 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1594,6 +1594,7 @@ static inline void flush_unauthorized_files(struct files_struct * files)
struct avc_audit_data ad;
struct file *file, *devnull = NULL;
struct tty_struct *tty = current->signal->tty;
+ struct fdtable *fdt;
long j = -1;
if (tty) {
@@ -1627,9 +1628,10 @@ static inline void flush_unauthorized_files(struct files_struct * files)
j++;
i = j * __NFDBITS;
- if (i >= files->max_fds || i >= files->max_fdset)
+ fdt = files_fdtable(files);
+ if (i >= fdt->max_fds || i >= fdt->max_fdset)
break;
- set = files->open_fds->fds_bits[j];
+ set = fdt->open_fds->fds_bits[j];
if (!set)
continue;
spin_unlock(&files->file_lock);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 03:50:19 +0000