diff options
Diffstat (limited to 'fs/proc/base.c')
| -rw-r--r-- | fs/proc/base.c | 82 |
1 files changed, 64 insertions, 18 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index fb34f88a4a74..634355e16986 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -70,6 +70,7 @@ #include <linux/seccomp.h> #include <linux/cpuset.h> #include <linux/audit.h> +#include <linux/poll.h> #include "internal.h" /* @@ -103,7 +104,9 @@ enum pid_directory_inos { PROC_TGID_NUMA_MAPS, PROC_TGID_MOUNTS, PROC_TGID_WCHAN, +#ifdef CONFIG_MMU PROC_TGID_SMAPS, +#endif #ifdef CONFIG_SCHEDSTATS PROC_TGID_SCHEDSTAT, #endif @@ -141,7 +144,9 @@ enum pid_directory_inos { PROC_TID_NUMA_MAPS, PROC_TID_MOUNTS, PROC_TID_WCHAN, +#ifdef CONFIG_MMU PROC_TID_SMAPS, +#endif #ifdef CONFIG_SCHEDSTATS PROC_TID_SCHEDSTAT, #endif @@ -195,7 +200,9 @@ static struct pid_entry tgid_base_stuff[] = { E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO), E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO), E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO), +#ifdef CONFIG_MMU E(PROC_TGID_SMAPS, "smaps", S_IFREG|S_IRUGO), +#endif #ifdef CONFIG_SECURITY E(PROC_TGID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO), #endif @@ -235,7 +242,9 @@ static struct pid_entry tid_base_stuff[] = { E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO), E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO), E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO), +#ifdef CONFIG_MMU E(PROC_TID_SMAPS, "smaps", S_IFREG|S_IRUGO), +#endif #ifdef CONFIG_SECURITY E(PROC_TID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO), #endif @@ -343,7 +352,8 @@ static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vf /* Same as proc_root_link, but this addionally tries to get fs from other * threads in the group */ -static int proc_task_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) +static int proc_task_root_link(struct inode *inode, struct dentry **dentry, + struct vfsmount **mnt) { struct fs_struct *fs; int result = -ENOENT; @@ -357,9 +367,10 @@ static int proc_task_root_link(struct inode *inode, struct dentry **dentry, stru } else { /* Try to get fs from other threads */ task_unlock(leader); - struct task_struct *task = leader; read_lock(&tasklist_lock); - if (pid_alive(task)) { + if (pid_alive(leader)) { + struct task_struct *task = leader; + while ((task = next_thread(task)) != leader) { task_lock(task); fs = task->fs; @@ -628,6 +639,7 @@ static struct file_operations proc_numa_maps_operations = { }; #endif +#ifdef CONFIG_MMU extern struct seq_operations proc_pid_smaps_op; static int smaps_open(struct inode *inode, struct file *file) { @@ -646,28 +658,41 @@ static struct file_operations proc_smaps_operations = { .llseek = seq_lseek, .release = seq_release, }; +#endif extern struct seq_operations mounts_op; +struct proc_mounts { + struct seq_file m; + int event; +}; + static int mounts_open(struct inode *inode, struct file *file) { struct task_struct *task = proc_task(inode); - int ret = seq_open(file, &mounts_op); + struct namespace *namespace; + struct proc_mounts *p; + int ret = -EINVAL; - if (!ret) { - struct seq_file *m = file->private_data; - struct namespace *namespace; - task_lock(task); - namespace = task->namespace; - if (namespace) - get_namespace(namespace); - task_unlock(task); - - if (namespace) - m->private = namespace; - else { - seq_release(inode, file); - ret = -EINVAL; + task_lock(task); + namespace = task->namespace; + if (namespace) + get_namespace(namespace); + task_unlock(task); + + if (namespace) { + ret = -ENOMEM; + p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); + if (p) { + file->private_data = &p->m; + ret = seq_open(file, &mounts_op); + if (!ret) { + p->m.private = namespace; + p->event = namespace->event; + return 0; + } + kfree(p); } + put_namespace(namespace); } return ret; } @@ -680,11 +705,30 @@ static int mounts_release(struct inode *inode, struct file *file) return seq_release(inode, file); } +static unsigned mounts_poll(struct file *file, poll_table *wait) +{ + struct proc_mounts *p = file->private_data; + struct namespace *ns = p->m.private; + unsigned res = 0; + + poll_wait(file, &ns->poll, wait); + + spin_lock(&vfsmount_lock); + if (p->event != ns->event) { + p->event = ns->event; + res = POLLERR; + } + spin_unlock(&vfsmount_lock); + + return res; +} + static struct file_operations proc_mounts_operations = { .open = mounts_open, .read = seq_read, .llseek = seq_lseek, .release = mounts_release, + .poll = mounts_poll, }; #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ @@ -1679,10 +1723,12 @@ static struct dentry *proc_pident_lookup(struct inode *dir, case PROC_TGID_MOUNTS: inode->i_fop = &proc_mounts_operations; break; +#ifdef CONFIG_MMU case PROC_TID_SMAPS: case PROC_TGID_SMAPS: inode->i_fop = &proc_smaps_operations; break; +#endif #ifdef CONFIG_SECURITY case PROC_TID_ATTR: inode->i_nlink = 2; |