1 files changed, 115 insertions, 44 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 491f2d9f89ac..84751f3f52d5 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -11,6 +11,40 @@
  *  go into icache. We cache the reference to task_struct upon lookup too.
  *  Eventually it should become a filesystem in its own. We don't use the
  *  rest of procfs anymore.
+ *
+ *
+ *  Changelog:
+ *  17-Jan-2005
+ *  Allan Bezerra
+ *  Bruna Moreira <bruna.moreira@indt.org.br>
+ *  Edjard Mota <edjard.mota@indt.org.br>
+ *  Ilias Biris <ilias.biris@indt.org.br>
+ *  Mauricio Lin <mauricio.lin@indt.org.br>
+ *
+ *  Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
+ *
+ *  A new process specific entry (smaps) included in /proc. It shows the
+ *  size of rss for each memory area. The maps entry lacks information
+ *  about physical memory size (rss) for each mapped file, i.e.,
+ *  rss information for executables and library files.
+ *  This additional information is useful for any tools that need to know
+ *  about physical memory consumption for a process specific library.
+ *
+ *  Changelog:
+ *  21-Feb-2005
+ *  Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
+ *  Pud inclusion in the page table walking.
+ *
+ *  ChangeLog:
+ *  10-Mar-2005
+ *  10LE Instituto Nokia de Tecnologia - INdT:
+ *  A better way to walks through the page table as suggested by Hugh Dickins.
+ *
+ *  Simo Piiroinen <simo.piiroinen@nokia.com>:
+ *  Smaps information related to shared, private, clean and dirty pages.
+ *
+ *  Paul Mundt <paul.mundt@nokia.com>:
+ *  Overall revision about smaps.
  */
 
 #include <asm/uaccess.h>
@@ -65,8 +99,10 @@ enum pid_directory_inos {
         PROC_TGID_STAT,
         PROC_TGID_STATM,
         PROC_TGID_MAPS,
+        PROC_TGID_NUMA_MAPS,
         PROC_TGID_MOUNTS,
         PROC_TGID_WCHAN,
+        PROC_TGID_SMAPS,
 #ifdef CONFIG_SCHEDSTATS
         PROC_TGID_SCHEDSTAT,
 #endif
@@ -83,7 +119,6 @@ enum pid_directory_inos {
 #ifdef CONFIG_AUDITSYSCALL
         PROC_TGID_LOGINUID,
 #endif
-        PROC_TGID_FD_DIR,
         PROC_TGID_OOM_SCORE,
         PROC_TGID_OOM_ADJUST,
         PROC_TID_INO,
@@ -102,8 +137,10 @@ enum pid_directory_inos {
         PROC_TID_STAT,
         PROC_TID_STATM,
         PROC_TID_MAPS,
+        PROC_TID_NUMA_MAPS,
         PROC_TID_MOUNTS,
         PROC_TID_WCHAN,
+        PROC_TID_SMAPS,
 #ifdef CONFIG_SCHEDSTATS
         PROC_TID_SCHEDSTAT,
 #endif
@@ -120,9 +157,11 @@ enum pid_directory_inos {
 #ifdef CONFIG_AUDITSYSCALL
         PROC_TID_LOGINUID,
 #endif
-        PROC_TID_FD_DIR = 0x8000,       /* 0x8000-0xffff */
         PROC_TID_OOM_SCORE,
         PROC_TID_OOM_ADJUST,
+
+        /* Add new entries before this */
+        PROC_TID_FD_DIR = 0x8000,       /* 0x8000-0xffff */
 };
 
 struct pid_entry {
@@ -144,6 +183,9 @@ static struct pid_entry tgid_base_stuff[] = {
         E(PROC_TGID_STAT,      "stat",    S_IFREG|S_IRUGO),
         E(PROC_TGID_STATM,     "statm",   S_IFREG|S_IRUGO),
         E(PROC_TGID_MAPS,      "maps",    S_IFREG|S_IRUGO),
+#ifdef CONFIG_NUMA
+        E(PROC_TGID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
+#endif
         E(PROC_TGID_MEM,       "mem",     S_IFREG|S_IRUSR|S_IWUSR),
 #ifdef CONFIG_SECCOMP
         E(PROC_TGID_SECCOMP,   "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
@@ -152,6 +194,7 @@ 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),
+        E(PROC_TGID_SMAPS,     "smaps",   S_IFREG|S_IRUGO),
 #ifdef CONFIG_SECURITY
         E(PROC_TGID_ATTR,      "attr",    S_IFDIR|S_IRUGO|S_IXUGO),
 #endif
@@ -180,6 +223,9 @@ static struct pid_entry tid_base_stuff[] = {
         E(PROC_TID_STAT,       "stat",    S_IFREG|S_IRUGO),
         E(PROC_TID_STATM,      "statm",   S_IFREG|S_IRUGO),
         E(PROC_TID_MAPS,       "maps",    S_IFREG|S_IRUGO),
+#ifdef CONFIG_NUMA
+        E(PROC_TID_NUMA_MAPS,  "numa_maps",    S_IFREG|S_IRUGO),
+#endif
         E(PROC_TID_MEM,        "mem",     S_IFREG|S_IRUSR|S_IWUSR),
 #ifdef CONFIG_SECCOMP
         E(PROC_TID_SECCOMP,    "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
@@ -188,6 +234,7 @@ 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),
+        E(PROC_TID_SMAPS,      "smaps",   S_IFREG|S_IRUGO),
 #ifdef CONFIG_SECURITY
         E(PROC_TID_ATTR,       "attr",    S_IFDIR|S_IRUGO|S_IXUGO),
 #endif
@@ -251,15 +298,21 @@ static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsm
         return -ENOENT;
 }
 
-static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
+static struct fs_struct *get_fs_struct(struct task_struct *task)
 {
         struct fs_struct *fs;
-        int result = -ENOENT;
-        task_lock(proc_task(inode));
-        fs = proc_task(inode)->fs;
+        task_lock(task);
+        fs = task->fs;
         if(fs)
                 atomic_inc(&fs->count);
-        task_unlock(proc_task(inode));
+        task_unlock(task);
+        return fs;
+}
+
+static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
+{
+        struct fs_struct *fs = get_fs_struct(proc_task(inode));
+        int result = -ENOENT;
         if (fs) {
                 read_lock(&fs->lock);
                 *mnt = mntget(fs->pwdmnt);
@@ -273,13 +326,8 @@ static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfs
 
 static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
 {
-        struct fs_struct *fs;
+        struct fs_struct *fs = get_fs_struct(proc_task(inode));
         int result = -ENOENT;
-        task_lock(proc_task(inode));
-        fs = proc_task(inode)->fs;
-        if(fs)
-                atomic_inc(&fs->count);
-        task_unlock(proc_task(inode));
         if (fs) {
                 read_lock(&fs->lock);
                 *mnt = mntget(fs->rootmnt);
@@ -298,33 +346,6 @@ static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vf
          (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \
          security_ptrace(current,task) == 0))
 
-static int may_ptrace_attach(struct task_struct *task)
-{
-        int retval = 0;
-
-        task_lock(task);
-
-        if (!task->mm)
-                goto out;
-        if (((current->uid != task->euid) ||
-             (current->uid != task->suid) ||
-             (current->uid != task->uid) ||
-             (current->gid != task->egid) ||
-             (current->gid != task->sgid) ||
-             (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE))
-                goto out;
-        rmb();
-        if (task->mm->dumpable != 1 && !capable(CAP_SYS_PTRACE))
-                goto out;
-        if (security_ptrace(current, task))
-                goto out;
-
-        retval = 1;
-out:
-        task_unlock(task);
-        return retval;
-}
-
 static int proc_pid_environ(struct task_struct *task, char * buffer)
 {
         int res = 0;
@@ -334,7 +355,7 @@ static int proc_pid_environ(struct task_struct *task, char * buffer)
                 if (len > PAGE_SIZE)
                         len = PAGE_SIZE;
                 res = access_process_vm(task, mm->env_start, buffer, len, 0);
-                if (!may_ptrace_attach(task))
+                if (!ptrace_may_attach(task))
                         res = -ESRCH;
                 mmput(mm);
         }
@@ -515,6 +536,46 @@ static struct file_operations proc_maps_operations = {
         .release        = seq_release,
 };
 
+#ifdef CONFIG_NUMA
+extern struct seq_operations proc_pid_numa_maps_op;
+static int numa_maps_open(struct inode *inode, struct file *file)
+{
+        struct task_struct *task = proc_task(inode);
+        int ret = seq_open(file, &proc_pid_numa_maps_op);
+        if (!ret) {
+                struct seq_file *m = file->private_data;
+                m->private = task;
+        }
+        return ret;
+}
+
+static struct file_operations proc_numa_maps_operations = {
+        .open           = numa_maps_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release,
+};
+#endif
+
+extern struct seq_operations proc_pid_smaps_op;
+static int smaps_open(struct inode *inode, struct file *file)
+{
+        struct task_struct *task = proc_task(inode);
+        int ret = seq_open(file, &proc_pid_smaps_op);
+        if (!ret) {
+                struct seq_file *m = file->private_data;
+                m->private = task;
+        }
+        return ret;
+}
+
+static struct file_operations proc_smaps_operations = {
+        .open           = smaps_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release,
+};
+
 extern struct seq_operations mounts_op;
 static int mounts_open(struct inode *inode, struct file *file)
 {
@@ -597,7 +658,7 @@ static ssize_t mem_read(struct file * file, char __user * buf,
         int ret = -ESRCH;
         struct mm_struct *mm;
 
-        if (!MAY_PTRACE(task) || !may_ptrace_attach(task))
+        if (!MAY_PTRACE(task) || !ptrace_may_attach(task))
                 goto out;
 
         ret = -ENOMEM;
@@ -623,7 +684,7 @@ static ssize_t mem_read(struct file * file, char __user * buf,
 
                 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
                 retval = access_process_vm(task, src, page, this_len, 0);
-                if (!retval || !MAY_PTRACE(task) || !may_ptrace_attach(task)) {
+                if (!retval || !MAY_PTRACE(task) || !ptrace_may_attach(task)) {
                         if (!ret)
                                 ret = -EIO;
                         break;
@@ -661,7 +722,7 @@ static ssize_t mem_write(struct file * file, const char * buf,
         struct task_struct *task = proc_task(file->f_dentry->d_inode);
         unsigned long dst = *ppos;
 
-        if (!MAY_PTRACE(task) || !may_ptrace_attach(task))
+        if (!MAY_PTRACE(task) || !ptrace_may_attach(task))
                 return -ESRCH;
 
         page = (char *)__get_free_page(GFP_USER);
@@ -1524,6 +1585,12 @@ static struct dentry *proc_pident_lookup(struct inode *dir,
                 case PROC_TGID_MAPS:
                         inode->i_fop = &proc_maps_operations;
                         break;
+#ifdef CONFIG_NUMA
+                case PROC_TID_NUMA_MAPS:
+                case PROC_TGID_NUMA_MAPS:
+                        inode->i_fop = &proc_numa_maps_operations;
+                        break;
+#endif
                 case PROC_TID_MEM:
                 case PROC_TGID_MEM:
                         inode->i_op = &proc_mem_inode_operations;
@@ -1539,6 +1606,10 @@ static struct dentry *proc_pident_lookup(struct inode *dir,
                 case PROC_TGID_MOUNTS:
                         inode->i_fop = &proc_mounts_operations;
                         break;
+                case PROC_TID_SMAPS:
+                case PROC_TGID_SMAPS:
+                        inode->i_fop = &proc_smaps_operations;
+                        break;
 #ifdef CONFIG_SECURITY
                 case PROC_TID_ATTR:
                         inode->i_nlink = 2;