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-rw-r--r--fs/proc/base.c199
1 files changed, 87 insertions, 112 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 2d696b0c93bf..baf852b648ad 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -105,7 +105,7 @@
*/
struct pid_entry {
- char *name;
+ const char *name;
int len;
umode_t mode;
const struct inode_operations *iop;
@@ -130,10 +130,6 @@ struct pid_entry {
{ .proc_get_link = get_link } )
#define REG(NAME, MODE, fops) \
NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
-#define INF(NAME, MODE, read) \
- NOD(NAME, (S_IFREG|(MODE)), \
- NULL, &proc_info_file_operations, \
- { .proc_read = read } )
#define ONE(NAME, MODE, show) \
NOD(NAME, (S_IFREG|(MODE)), \
NULL, &proc_single_file_operations, \
@@ -200,27 +196,32 @@ static int proc_root_link(struct dentry *dentry, struct path *path)
return result;
}
-static int proc_pid_cmdline(struct task_struct *task, char *buffer)
+static int proc_pid_cmdline(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
{
- return get_cmdline(task, buffer, PAGE_SIZE);
+ /*
+ * Rely on struct seq_operations::show() being called once
+ * per internal buffer allocation. See single_open(), traverse().
+ */
+ BUG_ON(m->size < PAGE_SIZE);
+ m->count += get_cmdline(task, m->buf, PAGE_SIZE);
+ return 0;
}
-static int proc_pid_auxv(struct task_struct *task, char *buffer)
+static int proc_pid_auxv(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
{
struct mm_struct *mm = mm_access(task, PTRACE_MODE_READ);
- int res = PTR_ERR(mm);
if (mm && !IS_ERR(mm)) {
unsigned int nwords = 0;
do {
nwords += 2;
} while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
- res = nwords * sizeof(mm->saved_auxv[0]);
- if (res > PAGE_SIZE)
- res = PAGE_SIZE;
- memcpy(buffer, mm->saved_auxv, res);
+ seq_write(m, mm->saved_auxv, nwords * sizeof(mm->saved_auxv[0]));
mmput(mm);
- }
- return res;
+ return 0;
+ } else
+ return PTR_ERR(mm);
}
@@ -229,7 +230,8 @@ static int proc_pid_auxv(struct task_struct *task, char *buffer)
* Provides a wchan file via kallsyms in a proper one-value-per-file format.
* Returns the resolved symbol. If that fails, simply return the address.
*/
-static int proc_pid_wchan(struct task_struct *task, char *buffer)
+static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
{
unsigned long wchan;
char symname[KSYM_NAME_LEN];
@@ -240,9 +242,9 @@ static int proc_pid_wchan(struct task_struct *task, char *buffer)
if (!ptrace_may_access(task, PTRACE_MODE_READ))
return 0;
else
- return sprintf(buffer, "%lu", wchan);
+ return seq_printf(m, "%lu", wchan);
else
- return sprintf(buffer, "%s", symname);
+ return seq_printf(m, "%s", symname);
}
#endif /* CONFIG_KALLSYMS */
@@ -304,9 +306,10 @@ static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
/*
* Provides /proc/PID/schedstat
*/
-static int proc_pid_schedstat(struct task_struct *task, char *buffer)
+static int proc_pid_schedstat(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
{
- return sprintf(buffer, "%llu %llu %lu\n",
+ return seq_printf(m, "%llu %llu %lu\n",
(unsigned long long)task->se.sum_exec_runtime,
(unsigned long long)task->sched_info.run_delay,
task->sched_info.pcount);
@@ -404,7 +407,8 @@ static const struct file_operations proc_cpuset_operations = {
};
#endif
-static int proc_oom_score(struct task_struct *task, char *buffer)
+static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
{
unsigned long totalpages = totalram_pages + total_swap_pages;
unsigned long points = 0;
@@ -414,12 +418,12 @@ static int proc_oom_score(struct task_struct *task, char *buffer)
points = oom_badness(task, NULL, NULL, totalpages) *
1000 / totalpages;
read_unlock(&tasklist_lock);
- return sprintf(buffer, "%lu\n", points);
+ return seq_printf(m, "%lu\n", points);
}
struct limit_names {
- char *name;
- char *unit;
+ const char *name;
+ const char *unit;
};
static const struct limit_names lnames[RLIM_NLIMITS] = {
@@ -442,12 +446,11 @@ static const struct limit_names lnames[RLIM_NLIMITS] = {
};
/* Display limits for a process */
-static int proc_pid_limits(struct task_struct *task, char *buffer)
+static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
{
unsigned int i;
- int count = 0;
unsigned long flags;
- char *bufptr = buffer;
struct rlimit rlim[RLIM_NLIMITS];
@@ -459,35 +462,34 @@ static int proc_pid_limits(struct task_struct *task, char *buffer)
/*
* print the file header
*/
- count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
+ seq_printf(m, "%-25s %-20s %-20s %-10s\n",
"Limit", "Soft Limit", "Hard Limit", "Units");
for (i = 0; i < RLIM_NLIMITS; i++) {
if (rlim[i].rlim_cur == RLIM_INFINITY)
- count += sprintf(&bufptr[count], "%-25s %-20s ",
+ seq_printf(m, "%-25s %-20s ",
lnames[i].name, "unlimited");
else
- count += sprintf(&bufptr[count], "%-25s %-20lu ",
+ seq_printf(m, "%-25s %-20lu ",
lnames[i].name, rlim[i].rlim_cur);
if (rlim[i].rlim_max == RLIM_INFINITY)
- count += sprintf(&bufptr[count], "%-20s ", "unlimited");
+ seq_printf(m, "%-20s ", "unlimited");
else
- count += sprintf(&bufptr[count], "%-20lu ",
- rlim[i].rlim_max);
+ seq_printf(m, "%-20lu ", rlim[i].rlim_max);
if (lnames[i].unit)
- count += sprintf(&bufptr[count], "%-10s\n",
- lnames[i].unit);
+ seq_printf(m, "%-10s\n", lnames[i].unit);
else
- count += sprintf(&bufptr[count], "\n");
+ seq_putc(m, '\n');
}
- return count;
+ return 0;
}
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
-static int proc_pid_syscall(struct task_struct *task, char *buffer)
+static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
{
long nr;
unsigned long args[6], sp, pc;
@@ -496,11 +498,11 @@ static int proc_pid_syscall(struct task_struct *task, char *buffer)
return res;
if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
- res = sprintf(buffer, "running\n");
+ seq_puts(m, "running\n");
else if (nr < 0)
- res = sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
+ seq_printf(m, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
else
- res = sprintf(buffer,
+ seq_printf(m,
"%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
nr,
args[0], args[1], args[2], args[3], args[4], args[5],
@@ -598,43 +600,6 @@ static const struct inode_operations proc_def_inode_operations = {
.setattr = proc_setattr,
};
-#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
-
-static ssize_t proc_info_read(struct file * file, char __user * buf,
- size_t count, loff_t *ppos)
-{
- struct inode * inode = file_inode(file);
- unsigned long page;
- ssize_t length;
- struct task_struct *task = get_proc_task(inode);
-
- length = -ESRCH;
- if (!task)
- goto out_no_task;
-
- if (count > PROC_BLOCK_SIZE)
- count = PROC_BLOCK_SIZE;
-
- length = -ENOMEM;
- if (!(page = __get_free_page(GFP_TEMPORARY)))
- goto out;
-
- length = PROC_I(inode)->op.proc_read(task, (char*)page);
-
- if (length >= 0)
- length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
- free_page(page);
-out:
- put_task_struct(task);
-out_no_task:
- return length;
-}
-
-static const struct file_operations proc_info_file_operations = {
- .read = proc_info_read,
- .llseek = generic_file_llseek,
-};
-
static int proc_single_show(struct seq_file *m, void *v)
{
struct inode *inode = m->private;
@@ -2056,7 +2021,7 @@ static int show_timer(struct seq_file *m, void *v)
struct k_itimer *timer;
struct timers_private *tp = m->private;
int notify;
- static char *nstr[] = {
+ static const char * const nstr[] = {
[SIGEV_SIGNAL] = "signal",
[SIGEV_NONE] = "none",
[SIGEV_THREAD] = "thread",
@@ -2392,7 +2357,7 @@ static const struct file_operations proc_coredump_filter_operations = {
#endif
#ifdef CONFIG_TASK_IO_ACCOUNTING
-static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
+static int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole)
{
struct task_io_accounting acct = task->ioac;
unsigned long flags;
@@ -2416,7 +2381,7 @@ static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
unlock_task_sighand(task, &flags);
}
- result = sprintf(buffer,
+ result = seq_printf(m,
"rchar: %llu\n"
"wchar: %llu\n"
"syscr: %llu\n"
@@ -2436,20 +2401,22 @@ out_unlock:
return result;
}
-static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
+static int proc_tid_io_accounting(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
{
- return do_io_accounting(task, buffer, 0);
+ return do_io_accounting(task, m, 0);
}
-static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
+static int proc_tgid_io_accounting(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
{
- return do_io_accounting(task, buffer, 1);
+ return do_io_accounting(task, m, 1);
}
#endif /* CONFIG_TASK_IO_ACCOUNTING */
#ifdef CONFIG_USER_NS
static int proc_id_map_open(struct inode *inode, struct file *file,
- struct seq_operations *seq_ops)
+ const struct seq_operations *seq_ops)
{
struct user_namespace *ns = NULL;
struct task_struct *task;
@@ -2557,10 +2524,10 @@ static const struct pid_entry tgid_base_stuff[] = {
DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
#endif
REG("environ", S_IRUSR, proc_environ_operations),
- INF("auxv", S_IRUSR, proc_pid_auxv),
+ ONE("auxv", S_IRUSR, proc_pid_auxv),
ONE("status", S_IRUGO, proc_pid_status),
ONE("personality", S_IRUSR, proc_pid_personality),
- INF("limits", S_IRUGO, proc_pid_limits),
+ ONE("limits", S_IRUGO, proc_pid_limits),
#ifdef CONFIG_SCHED_DEBUG
REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
#endif
@@ -2569,9 +2536,9 @@ static const struct pid_entry tgid_base_stuff[] = {
#endif
REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
- INF("syscall", S_IRUSR, proc_pid_syscall),
+ ONE("syscall", S_IRUSR, proc_pid_syscall),
#endif
- INF("cmdline", S_IRUGO, proc_pid_cmdline),
+ ONE("cmdline", S_IRUGO, proc_pid_cmdline),
ONE("stat", S_IRUGO, proc_tgid_stat),
ONE("statm", S_IRUGO, proc_pid_statm),
REG("maps", S_IRUGO, proc_pid_maps_operations),
@@ -2594,13 +2561,13 @@ static const struct pid_entry tgid_base_stuff[] = {
DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
#endif
#ifdef CONFIG_KALLSYMS
- INF("wchan", S_IRUGO, proc_pid_wchan),
+ ONE("wchan", S_IRUGO, proc_pid_wchan),
#endif
#ifdef CONFIG_STACKTRACE
ONE("stack", S_IRUSR, proc_pid_stack),
#endif
#ifdef CONFIG_SCHEDSTATS
- INF("schedstat", S_IRUGO, proc_pid_schedstat),
+ ONE("schedstat", S_IRUGO, proc_pid_schedstat),
#endif
#ifdef CONFIG_LATENCYTOP
REG("latency", S_IRUGO, proc_lstats_operations),
@@ -2611,7 +2578,7 @@ static const struct pid_entry tgid_base_stuff[] = {
#ifdef CONFIG_CGROUPS
REG("cgroup", S_IRUGO, proc_cgroup_operations),
#endif
- INF("oom_score", S_IRUGO, proc_oom_score),
+ ONE("oom_score", S_IRUGO, proc_oom_score),
REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations),
REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
#ifdef CONFIG_AUDITSYSCALL
@@ -2625,10 +2592,10 @@ static const struct pid_entry tgid_base_stuff[] = {
REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
#endif
#ifdef CONFIG_TASK_IO_ACCOUNTING
- INF("io", S_IRUSR, proc_tgid_io_accounting),
+ ONE("io", S_IRUSR, proc_tgid_io_accounting),
#endif
#ifdef CONFIG_HARDWALL
- INF("hardwall", S_IRUGO, proc_pid_hardwall),
+ ONE("hardwall", S_IRUGO, proc_pid_hardwall),
#endif
#ifdef CONFIG_USER_NS
REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
@@ -2780,12 +2747,12 @@ out:
struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags)
{
- int result = 0;
+ int result = -ENOENT;
struct task_struct *task;
unsigned tgid;
struct pid_namespace *ns;
- tgid = name_to_int(dentry);
+ tgid = name_to_int(&dentry->d_name);
if (tgid == ~0U)
goto out;
@@ -2847,7 +2814,7 @@ retry:
return iter;
}
-#define TGID_OFFSET (FIRST_PROCESS_ENTRY + 1)
+#define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
/* for the /proc/ directory itself, after non-process stuff has been done */
int proc_pid_readdir(struct file *file, struct dir_context *ctx)
@@ -2859,14 +2826,19 @@ int proc_pid_readdir(struct file *file, struct dir_context *ctx)
if (pos >= PID_MAX_LIMIT + TGID_OFFSET)
return 0;
- if (pos == TGID_OFFSET - 1) {
+ if (pos == TGID_OFFSET - 2) {
struct inode *inode = ns->proc_self->d_inode;
if (!dir_emit(ctx, "self", 4, inode->i_ino, DT_LNK))
return 0;
- iter.tgid = 0;
- } else {
- iter.tgid = pos - TGID_OFFSET;
+ ctx->pos = pos = pos + 1;
}
+ if (pos == TGID_OFFSET - 1) {
+ struct inode *inode = ns->proc_thread_self->d_inode;
+ if (!dir_emit(ctx, "thread-self", 11, inode->i_ino, DT_LNK))
+ return 0;
+ ctx->pos = pos = pos + 1;
+ }
+ iter.tgid = pos - TGID_OFFSET;
iter.task = NULL;
for (iter = next_tgid(ns, iter);
iter.task;
@@ -2895,19 +2867,22 @@ static const struct pid_entry tid_base_stuff[] = {
DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
+#ifdef CONFIG_NET
+ DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
+#endif
REG("environ", S_IRUSR, proc_environ_operations),
- INF("auxv", S_IRUSR, proc_pid_auxv),
+ ONE("auxv", S_IRUSR, proc_pid_auxv),
ONE("status", S_IRUGO, proc_pid_status),
ONE("personality", S_IRUSR, proc_pid_personality),
- INF("limits", S_IRUGO, proc_pid_limits),
+ ONE("limits", S_IRUGO, proc_pid_limits),
#ifdef CONFIG_SCHED_DEBUG
REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
#endif
REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
- INF("syscall", S_IRUSR, proc_pid_syscall),
+ ONE("syscall", S_IRUSR, proc_pid_syscall),
#endif
- INF("cmdline", S_IRUGO, proc_pid_cmdline),
+ ONE("cmdline", S_IRUGO, proc_pid_cmdline),
ONE("stat", S_IRUGO, proc_tid_stat),
ONE("statm", S_IRUGO, proc_pid_statm),
REG("maps", S_IRUGO, proc_tid_maps_operations),
@@ -2932,13 +2907,13 @@ static const struct pid_entry tid_base_stuff[] = {
DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
#endif
#ifdef CONFIG_KALLSYMS
- INF("wchan", S_IRUGO, proc_pid_wchan),
+ ONE("wchan", S_IRUGO, proc_pid_wchan),
#endif
#ifdef CONFIG_STACKTRACE
ONE("stack", S_IRUSR, proc_pid_stack),
#endif
#ifdef CONFIG_SCHEDSTATS
- INF("schedstat", S_IRUGO, proc_pid_schedstat),
+ ONE("schedstat", S_IRUGO, proc_pid_schedstat),
#endif
#ifdef CONFIG_LATENCYTOP
REG("latency", S_IRUGO, proc_lstats_operations),
@@ -2949,7 +2924,7 @@ static const struct pid_entry tid_base_stuff[] = {
#ifdef CONFIG_CGROUPS
REG("cgroup", S_IRUGO, proc_cgroup_operations),
#endif
- INF("oom_score", S_IRUGO, proc_oom_score),
+ ONE("oom_score", S_IRUGO, proc_oom_score),
REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations),
REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
#ifdef CONFIG_AUDITSYSCALL
@@ -2960,10 +2935,10 @@ static const struct pid_entry tid_base_stuff[] = {
REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
#endif
#ifdef CONFIG_TASK_IO_ACCOUNTING
- INF("io", S_IRUSR, proc_tid_io_accounting),
+ ONE("io", S_IRUSR, proc_tid_io_accounting),
#endif
#ifdef CONFIG_HARDWALL
- INF("hardwall", S_IRUGO, proc_pid_hardwall),
+ ONE("hardwall", S_IRUGO, proc_pid_hardwall),
#endif
#ifdef CONFIG_USER_NS
REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
@@ -3033,7 +3008,7 @@ static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry
if (!leader)
goto out_no_task;
- tid = name_to_int(dentry);
+ tid = name_to_int(&dentry->d_name);
if (tid == ~0U)
goto out;
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