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-rw-r--r--fs/proc/base.c120
-rw-r--r--fs/proc/generic.c18
-rw-r--r--fs/proc/inode.c6
-rw-r--r--fs/proc/proc_sysctl.c15
4 files changed, 138 insertions, 21 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index acb7ef80ea4f..c806dfb24e08 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -63,6 +63,7 @@
#include <linux/namei.h>
#include <linux/mnt_namespace.h>
#include <linux/mm.h>
+#include <linux/swap.h>
#include <linux/rcupdate.h>
#include <linux/kallsyms.h>
#include <linux/stacktrace.h>
@@ -427,17 +428,14 @@ static const struct file_operations proc_lstats_operations = {
#endif
-/* The badness from the OOM killer */
-unsigned long badness(struct task_struct *p, unsigned long uptime);
static int proc_oom_score(struct task_struct *task, char *buffer)
{
unsigned long points = 0;
- struct timespec uptime;
- do_posix_clock_monotonic_gettime(&uptime);
read_lock(&tasklist_lock);
if (pid_alive(task))
- points = badness(task, uptime.tv_sec);
+ points = oom_badness(task, NULL, NULL,
+ totalram_pages + total_swap_pages);
read_unlock(&tasklist_lock);
return sprintf(buffer, "%lu\n", points);
}
@@ -561,9 +559,19 @@ static int proc_setattr(struct dentry *dentry, struct iattr *attr)
return -EPERM;
error = inode_change_ok(inode, attr);
- if (!error)
- error = inode_setattr(inode, attr);
- return error;
+ if (error)
+ return error;
+
+ if ((attr->ia_valid & ATTR_SIZE) &&
+ attr->ia_size != i_size_read(inode)) {
+ error = vmtruncate(inode, attr->ia_size);
+ if (error)
+ return error;
+ }
+
+ setattr_copy(inode, attr);
+ mark_inode_dirty(inode);
+ return 0;
}
static const struct inode_operations proc_def_inode_operations = {
@@ -1039,8 +1047,24 @@ static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
return -EACCES;
}
+ /*
+ * Warn that /proc/pid/oom_adj is deprecated, see
+ * Documentation/feature-removal-schedule.txt.
+ */
+ printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, "
+ "please use /proc/%d/oom_score_adj instead.\n",
+ current->comm, task_pid_nr(current),
+ task_pid_nr(task), task_pid_nr(task));
task->signal->oom_adj = oom_adjust;
-
+ /*
+ * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
+ * value is always attainable.
+ */
+ if (task->signal->oom_adj == OOM_ADJUST_MAX)
+ task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX;
+ else
+ task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
+ -OOM_DISABLE;
unlock_task_sighand(task, &flags);
put_task_struct(task);
@@ -1053,6 +1077,82 @@ static const struct file_operations proc_oom_adjust_operations = {
.llseek = generic_file_llseek,
};
+static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
+ char buffer[PROC_NUMBUF];
+ int oom_score_adj = OOM_SCORE_ADJ_MIN;
+ unsigned long flags;
+ size_t len;
+
+ if (!task)
+ return -ESRCH;
+ if (lock_task_sighand(task, &flags)) {
+ oom_score_adj = task->signal->oom_score_adj;
+ unlock_task_sighand(task, &flags);
+ }
+ put_task_struct(task);
+ len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj);
+ return simple_read_from_buffer(buf, count, ppos, buffer, len);
+}
+
+static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct task_struct *task;
+ char buffer[PROC_NUMBUF];
+ unsigned long flags;
+ long oom_score_adj;
+ int err;
+
+ memset(buffer, 0, sizeof(buffer));
+ if (count > sizeof(buffer) - 1)
+ count = sizeof(buffer) - 1;
+ if (copy_from_user(buffer, buf, count))
+ return -EFAULT;
+
+ err = strict_strtol(strstrip(buffer), 0, &oom_score_adj);
+ if (err)
+ return -EINVAL;
+ if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
+ oom_score_adj > OOM_SCORE_ADJ_MAX)
+ return -EINVAL;
+
+ task = get_proc_task(file->f_path.dentry->d_inode);
+ if (!task)
+ return -ESRCH;
+ if (!lock_task_sighand(task, &flags)) {
+ put_task_struct(task);
+ return -ESRCH;
+ }
+ if (oom_score_adj < task->signal->oom_score_adj &&
+ !capable(CAP_SYS_RESOURCE)) {
+ unlock_task_sighand(task, &flags);
+ put_task_struct(task);
+ return -EACCES;
+ }
+
+ task->signal->oom_score_adj = oom_score_adj;
+ /*
+ * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
+ * always attainable.
+ */
+ if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
+ task->signal->oom_adj = OOM_DISABLE;
+ else
+ task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
+ OOM_SCORE_ADJ_MAX;
+ unlock_task_sighand(task, &flags);
+ put_task_struct(task);
+ return count;
+}
+
+static const struct file_operations proc_oom_score_adj_operations = {
+ .read = oom_score_adj_read,
+ .write = oom_score_adj_write,
+};
+
#ifdef CONFIG_AUDITSYSCALL
#define TMPBUFLEN 21
static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
@@ -2625,6 +2725,7 @@ static const struct pid_entry tgid_base_stuff[] = {
#endif
INF("oom_score", S_IRUGO, proc_oom_score),
REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
+ REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
#ifdef CONFIG_AUDITSYSCALL
REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
REG("sessionid", S_IRUGO, proc_sessionid_operations),
@@ -2959,6 +3060,7 @@ static const struct pid_entry tid_base_stuff[] = {
#endif
INF("oom_score", S_IRUGO, proc_oom_score),
REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
+ REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
#ifdef CONFIG_AUDITSYSCALL
REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
REG("sessionid", S_IRUSR, proc_sessionid_operations),
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 2791907744ed..dd29f0337661 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -12,6 +12,7 @@
#include <linux/time.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
+#include <linux/mm.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/mount.h>
@@ -258,17 +259,22 @@ static int proc_notify_change(struct dentry *dentry, struct iattr *iattr)
error = inode_change_ok(inode, iattr);
if (error)
- goto out;
+ return error;
- error = inode_setattr(inode, iattr);
- if (error)
- goto out;
+ if ((iattr->ia_valid & ATTR_SIZE) &&
+ iattr->ia_size != i_size_read(inode)) {
+ error = vmtruncate(inode, iattr->ia_size);
+ if (error)
+ return error;
+ }
+
+ setattr_copy(inode, iattr);
+ mark_inode_dirty(inode);
de->uid = inode->i_uid;
de->gid = inode->i_gid;
de->mode = inode->i_mode;
-out:
- return error;
+ return 0;
}
static int proc_getattr(struct vfsmount *mnt, struct dentry *dentry,
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index aea8502e58a3..23561cda7245 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -25,11 +25,12 @@
#include "internal.h"
-static void proc_delete_inode(struct inode *inode)
+static void proc_evict_inode(struct inode *inode)
{
struct proc_dir_entry *de;
truncate_inode_pages(&inode->i_data, 0);
+ end_writeback(inode);
/* Stop tracking associated processes */
put_pid(PROC_I(inode)->pid);
@@ -40,7 +41,6 @@ static void proc_delete_inode(struct inode *inode)
pde_put(de);
if (PROC_I(inode)->sysctl)
sysctl_head_put(PROC_I(inode)->sysctl);
- clear_inode(inode);
}
struct vfsmount *proc_mnt;
@@ -91,7 +91,7 @@ static const struct super_operations proc_sops = {
.alloc_inode = proc_alloc_inode,
.destroy_inode = proc_destroy_inode,
.drop_inode = generic_delete_inode,
- .delete_inode = proc_delete_inode,
+ .evict_inode = proc_evict_inode,
.statfs = simple_statfs,
};
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 6ff9981f0a18..5be436ea088e 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -329,10 +329,19 @@ static int proc_sys_setattr(struct dentry *dentry, struct iattr *attr)
return -EPERM;
error = inode_change_ok(inode, attr);
- if (!error)
- error = inode_setattr(inode, attr);
+ if (error)
+ return error;
+
+ if ((attr->ia_valid & ATTR_SIZE) &&
+ attr->ia_size != i_size_read(inode)) {
+ error = vmtruncate(inode, attr->ia_size);
+ if (error)
+ return error;
+ }
- return error;
+ setattr_copy(inode, attr);
+ mark_inode_dirty(inode);
+ return 0;
}
static int proc_sys_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 11:08:20 +0000