summaryrefslogtreecommitdiff
path: root/fs/proc
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2011-11-02 16:07:27 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-02 16:07:27 -0700
commit092f4c56c1927e4b61a41ee8055005f1cb437009 (patch)
tree616ceb54b7671ccc13922ae9e002b8b972f6e09e /fs/proc
parent80c2861672bbf000f6af838656959ee937e4ee4d (diff)
parentc1e2ee2dc436574880758b3836fc96935b774c32 (diff)
Merge branch 'akpm' (Andrew's incoming - part two)
Says Andrew: "60 patches. That's good enough for -rc1 I guess. I have quite a lot of detritus to be rechecked, work through maintainers, etc. - most of the remains of MM - rtc - various misc - cgroups - memcg - cpusets - procfs - ipc - rapidio - sysctl - pps - w1 - drivers/misc - aio" * akpm: (60 commits) memcg: replace ss->id_lock with a rwlock aio: allocate kiocbs in batches drivers/misc/vmw_balloon.c: fix typo in code comment drivers/misc/vmw_balloon.c: determine page allocation flag can_sleep outside loop w1: disable irqs in critical section drivers/w1/w1_int.c: multiple masters used same init_name drivers/power/ds2780_battery.c: fix deadlock upon insertion and removal drivers/power/ds2780_battery.c: add a nolock function to w1 interface drivers/power/ds2780_battery.c: create central point for calling w1 interface w1: ds2760 and ds2780, use ida for id and ida_simple_get() to get it pps gpio client: add missing dependency pps: new client driver using GPIO pps: default echo function include/linux/dma-mapping.h: add dma_zalloc_coherent() sysctl: make CONFIG_SYSCTL_SYSCALL default to n sysctl: add support for poll() RapidIO: documentation update drivers/net/rionet.c: fix ethernet address macros for LE platforms RapidIO: fix potential null deref in rio_setup_device() RapidIO: add mport driver for Tsi721 bridge ...
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/base.c146
-rw-r--r--fs/proc/proc_sysctl.c46
2 files changed, 149 insertions, 43 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 851ba3dcdc29..2db1bd3173b2 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1652,12 +1652,46 @@ out:
return error;
}
+static int proc_pid_fd_link_getattr(struct vfsmount *mnt, struct dentry *dentry,
+ struct kstat *stat)
+{
+ struct inode *inode = dentry->d_inode;
+ struct task_struct *task = get_proc_task(inode);
+ int rc;
+
+ if (task == NULL)
+ return -ESRCH;
+
+ rc = -EACCES;
+ if (lock_trace(task))
+ goto out_task;
+
+ generic_fillattr(inode, stat);
+ unlock_trace(task);
+ rc = 0;
+out_task:
+ put_task_struct(task);
+ return rc;
+}
+
static const struct inode_operations proc_pid_link_inode_operations = {
.readlink = proc_pid_readlink,
.follow_link = proc_pid_follow_link,
.setattr = proc_setattr,
};
+static const struct inode_operations proc_fdinfo_link_inode_operations = {
+ .setattr = proc_setattr,
+ .getattr = proc_pid_fd_link_getattr,
+};
+
+static const struct inode_operations proc_fd_link_inode_operations = {
+ .readlink = proc_pid_readlink,
+ .follow_link = proc_pid_follow_link,
+ .setattr = proc_setattr,
+ .getattr = proc_pid_fd_link_getattr,
+};
+
/* building an inode */
@@ -1889,49 +1923,61 @@ out:
static int proc_fd_info(struct inode *inode, struct path *path, char *info)
{
- struct task_struct *task = get_proc_task(inode);
- struct files_struct *files = NULL;
+ struct task_struct *task;
+ struct files_struct *files;
struct file *file;
int fd = proc_fd(inode);
+ int rc;
- if (task) {
- files = get_files_struct(task);
- put_task_struct(task);
- }
- if (files) {
- /*
- * We are not taking a ref to the file structure, so we must
- * hold ->file_lock.
- */
- spin_lock(&files->file_lock);
- file = fcheck_files(files, fd);
- if (file) {
- unsigned int f_flags;
- struct fdtable *fdt;
-
- fdt = files_fdtable(files);
- f_flags = file->f_flags & ~O_CLOEXEC;
- if (FD_ISSET(fd, fdt->close_on_exec))
- f_flags |= O_CLOEXEC;
-
- if (path) {
- *path = file->f_path;
- path_get(&file->f_path);
- }
- if (info)
- snprintf(info, PROC_FDINFO_MAX,
- "pos:\t%lli\n"
- "flags:\t0%o\n",
- (long long) file->f_pos,
- f_flags);
- spin_unlock(&files->file_lock);
- put_files_struct(files);
- return 0;
+ task = get_proc_task(inode);
+ if (!task)
+ return -ENOENT;
+
+ rc = -EACCES;
+ if (lock_trace(task))
+ goto out_task;
+
+ rc = -ENOENT;
+ files = get_files_struct(task);
+ if (files == NULL)
+ goto out_unlock;
+
+ /*
+ * We are not taking a ref to the file structure, so we must
+ * hold ->file_lock.
+ */
+ spin_lock(&files->file_lock);
+ file = fcheck_files(files, fd);
+ if (file) {
+ unsigned int f_flags;
+ struct fdtable *fdt;
+
+ fdt = files_fdtable(files);
+ f_flags = file->f_flags & ~O_CLOEXEC;
+ if (FD_ISSET(fd, fdt->close_on_exec))
+ f_flags |= O_CLOEXEC;
+
+ if (path) {
+ *path = file->f_path;
+ path_get(&file->f_path);
}
- spin_unlock(&files->file_lock);
- put_files_struct(files);
- }
- return -ENOENT;
+ if (info)
+ snprintf(info, PROC_FDINFO_MAX,
+ "pos:\t%lli\n"
+ "flags:\t0%o\n",
+ (long long) file->f_pos,
+ f_flags);
+ rc = 0;
+ } else
+ rc = -ENOENT;
+ spin_unlock(&files->file_lock);
+ put_files_struct(files);
+
+out_unlock:
+ unlock_trace(task);
+out_task:
+ put_task_struct(task);
+ return rc;
}
static int proc_fd_link(struct inode *inode, struct path *path)
@@ -2026,7 +2072,7 @@ static struct dentry *proc_fd_instantiate(struct inode *dir,
spin_unlock(&files->file_lock);
put_files_struct(files);
- inode->i_op = &proc_pid_link_inode_operations;
+ inode->i_op = &proc_fd_link_inode_operations;
inode->i_size = 64;
ei->op.proc_get_link = proc_fd_link;
d_set_d_op(dentry, &tid_fd_dentry_operations);
@@ -2058,7 +2104,12 @@ static struct dentry *proc_lookupfd_common(struct inode *dir,
if (fd == ~0U)
goto out;
+ result = ERR_PTR(-EACCES);
+ if (lock_trace(task))
+ goto out;
+
result = instantiate(dir, dentry, task, &fd);
+ unlock_trace(task);
out:
put_task_struct(task);
out_no_task:
@@ -2078,23 +2129,28 @@ static int proc_readfd_common(struct file * filp, void * dirent,
retval = -ENOENT;
if (!p)
goto out_no_task;
+
+ retval = -EACCES;
+ if (lock_trace(p))
+ goto out;
+
retval = 0;
fd = filp->f_pos;
switch (fd) {
case 0:
if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
- goto out;
+ goto out_unlock;
filp->f_pos++;
case 1:
ino = parent_ino(dentry);
if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
- goto out;
+ goto out_unlock;
filp->f_pos++;
default:
files = get_files_struct(p);
if (!files)
- goto out;
+ goto out_unlock;
rcu_read_lock();
for (fd = filp->f_pos-2;
fd < files_fdtable(files)->max_fds;
@@ -2118,6 +2174,9 @@ static int proc_readfd_common(struct file * filp, void * dirent,
rcu_read_unlock();
put_files_struct(files);
}
+
+out_unlock:
+ unlock_trace(p);
out:
put_task_struct(p);
out_no_task:
@@ -2195,6 +2254,7 @@ static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
ei->fd = fd;
inode->i_mode = S_IFREG | S_IRUSR;
inode->i_fop = &proc_fdinfo_file_operations;
+ inode->i_op = &proc_fdinfo_link_inode_operations;
d_set_d_op(dentry, &tid_fd_dentry_operations);
d_add(dentry, inode);
/* Close the race of the process dying before we return the dentry */
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index b44113279e30..a6b62173d4c3 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -3,6 +3,7 @@
*/
#include <linux/init.h>
#include <linux/sysctl.h>
+#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/security.h>
#include <linux/namei.h>
@@ -14,6 +15,15 @@ static const struct inode_operations proc_sys_inode_operations;
static const struct file_operations proc_sys_dir_file_operations;
static const struct inode_operations proc_sys_dir_operations;
+void proc_sys_poll_notify(struct ctl_table_poll *poll)
+{
+ if (!poll)
+ return;
+
+ atomic_inc(&poll->event);
+ wake_up_interruptible(&poll->wait);
+}
+
static struct inode *proc_sys_make_inode(struct super_block *sb,
struct ctl_table_header *head, struct ctl_table *table)
{
@@ -176,6 +186,39 @@ static ssize_t proc_sys_write(struct file *filp, const char __user *buf,
return proc_sys_call_handler(filp, (void __user *)buf, count, ppos, 1);
}
+static int proc_sys_open(struct inode *inode, struct file *filp)
+{
+ struct ctl_table *table = PROC_I(inode)->sysctl_entry;
+
+ if (table->poll)
+ filp->private_data = proc_sys_poll_event(table->poll);
+
+ return 0;
+}
+
+static unsigned int proc_sys_poll(struct file *filp, poll_table *wait)
+{
+ struct inode *inode = filp->f_path.dentry->d_inode;
+ struct ctl_table *table = PROC_I(inode)->sysctl_entry;
+ unsigned long event = (unsigned long)filp->private_data;
+ unsigned int ret = DEFAULT_POLLMASK;
+
+ if (!table->proc_handler)
+ goto out;
+
+ if (!table->poll)
+ goto out;
+
+ poll_wait(filp, &table->poll->wait, wait);
+
+ if (event != atomic_read(&table->poll->event)) {
+ filp->private_data = proc_sys_poll_event(table->poll);
+ ret = POLLIN | POLLRDNORM | POLLERR | POLLPRI;
+ }
+
+out:
+ return ret;
+}
static int proc_sys_fill_cache(struct file *filp, void *dirent,
filldir_t filldir,
@@ -364,12 +407,15 @@ static int proc_sys_getattr(struct vfsmount *mnt, struct dentry *dentry, struct
}
static const struct file_operations proc_sys_file_operations = {
+ .open = proc_sys_open,
+ .poll = proc_sys_poll,
.read = proc_sys_read,
.write = proc_sys_write,
.llseek = default_llseek,
};
static const struct file_operations proc_sys_dir_file_operations = {
+ .read = generic_read_dir,
.readdir = proc_sys_readdir,
.llseek = generic_file_llseek,
};