UBUNTU: Ubuntu-2.6.38-12.51

[linux-flexiantxendom0-natty.git] / ipc / shm.c

diff --git a/ipc/shm.c b/ipc/shm.c
index e9b039f..7d3bb22 100644 (file)
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -39,7 +39,6 @@
 #include <linux/nsproxy.h>
 #include <linux/mount.h>
 #include <linux/ipc_namespace.h>
-#include <linux/ima.h>
 
 #include <asm/uaccess.h>
 
@@ -109,7 +108,11 @@ void __init shm_init (void)
 {
        shm_init_ns(&init_ipc_ns);
        ipc_init_proc_interface("sysvipc/shm",
-                               "       key      shmid perms       size  cpid  lpid nattch   uid   gid  cuid  cgid      atime      dtime      ctime\n",
+#if BITS_PER_LONG <= 32
+                               "       key      shmid perms       size  cpid  lpid nattch   uid   gid  cuid  cgid      atime      dtime      ctime        rss       swap\n",
+#else
+                               "       key      shmid perms                  size  cpid  lpid nattch   uid   gid  cuid  cgid      atime      dtime      ctime                   rss                  swap\n",
+#endif
                                IPC_SHM_IDS, sysvipc_shm_proc_show);
 }
 
@@ -274,16 +277,13 @@ static int shm_release(struct inode *ino, struct file *file)
        return 0;
 }
 
-static int shm_fsync(struct file *file, struct dentry *dentry, int datasync)
+static int shm_fsync(struct file *file, int datasync)
 {
-       int (*fsync) (struct file *, struct dentry *, int datasync);
        struct shm_file_data *sfd = shm_file_data(file);
-       int ret = -EINVAL;
 
-       fsync = sfd->file->f_op->fsync;
-       if (fsync)
-               ret = fsync(sfd->file, sfd->file->f_path.dentry, datasync);
-       return ret;
+       if (!sfd->file->f_op->fsync)
+               return -EINVAL;
+       return sfd->file->f_op->fsync(sfd->file, datasync);
 }
 
 static unsigned long shm_get_unmapped_area(struct file *file,
@@ -299,6 +299,10 @@ static const struct file_operations shm_file_operations = {
        .mmap           = shm_mmap,
        .fsync          = shm_fsync,
        .release        = shm_release,
+#ifndef CONFIG_MMU
+       .get_unmapped_area      = shm_get_unmapped_area,
+#endif
+       .llseek         = noop_llseek,
 };
 
 static const struct file_operations shm_file_operations_huge = {
@@ -306,6 +310,7 @@ static const struct file_operations shm_file_operations_huge = {
        .fsync          = shm_fsync,
        .release        = shm_release,
        .get_unmapped_area      = shm_get_unmapped_area,
+       .llseek         = noop_llseek,
 };
 
 int is_file_shm_hugepages(struct file *file)
@@ -474,6 +479,7 @@ static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_
            {
                struct shmid_ds out;
 
+               memset(&out, 0, sizeof(out));
                ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
                out.shm_segsz   = in->shm_segsz;
                out.shm_atime   = in->shm_atime;
@@ -543,6 +549,34 @@ static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminf
 }
 
 /*
+ * Calculate and add used RSS and swap pages of a shm.
+ * Called with shm_ids.rw_mutex held as a reader
+ */
+static void shm_add_rss_swap(struct shmid_kernel *shp,
+       unsigned long *rss_add, unsigned long *swp_add)
+{
+       struct inode *inode;
+
+       inode = shp->shm_file->f_path.dentry->d_inode;
+
+       if (is_file_hugepages(shp->shm_file)) {
+               struct address_space *mapping = inode->i_mapping;
+               struct hstate *h = hstate_file(shp->shm_file);
+               *rss_add += pages_per_huge_page(h) * mapping->nrpages;
+       } else {
+#ifdef CONFIG_SHMEM
+               struct shmem_inode_info *info = SHMEM_I(inode);
+               spin_lock(&info->lock);
+               *rss_add += inode->i_mapping->nrpages;
+               *swp_add += info->swapped;
+               spin_unlock(&info->lock);
+#else
+               *rss_add += inode->i_mapping->nrpages;
+#endif
+       }
+}
+
+/*
  * Called with shm_ids.rw_mutex held as a reader
  */
 static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
@@ -559,30 +593,13 @@ static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
        for (total = 0, next_id = 0; total < in_use; next_id++) {
                struct kern_ipc_perm *ipc;
                struct shmid_kernel *shp;
-               struct inode *inode;
 
                ipc = idr_find(&shm_ids(ns).ipcs_idr, next_id);
                if (ipc == NULL)
                        continue;
                shp = container_of(ipc, struct shmid_kernel, shm_perm);
 
-               inode = shp->shm_file->f_path.dentry->d_inode;
-
-               if (is_file_hugepages(shp->shm_file)) {
-                       struct address_space *mapping = inode->i_mapping;
-                       struct hstate *h = hstate_file(shp->shm_file);
-                       *rss += pages_per_huge_page(h) * mapping->nrpages;
-               } else {
-#ifdef CONFIG_SHMEM
-                       struct shmem_inode_info *info = SHMEM_I(inode);
-                       spin_lock(&info->lock);
-                       *rss += inode->i_mapping->nrpages;
-                       *swp += info->swapped;
-                       spin_unlock(&info->lock);
-#else
-                       *rss += inode->i_mapping->nrpages;
-#endif
-               }
+               shm_add_rss_swap(shp, rss, swp);
 
                total++;
        }
@@ -762,8 +779,7 @@ SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
                        if (euid != shp->shm_perm.uid &&
                            euid != shp->shm_perm.cuid)
                                goto out_unlock;
-                       if (cmd == SHM_LOCK &&
-                           !current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur)
+                       if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK))
                                goto out_unlock;
                }
 
@@ -879,8 +895,8 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
        if (err)
                goto out_unlock;
 
-       path.dentry = dget(shp->shm_file->f_path.dentry);
-       path.mnt    = shp->shm_file->f_path.mnt;
+       path = shp->shm_file->f_path;
+       path_get(&path);
        shp->shm_nattch++;
        size = i_size_read(path.dentry->d_inode);
        shm_unlock(shp);
@@ -890,13 +906,12 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
        if (!sfd)
                goto out_put_dentry;
 
-       file = alloc_file(path.mnt, path.dentry, f_mode,
-                       is_file_hugepages(shp->shm_file) ?
+       file = alloc_file(&path, f_mode,
+                         is_file_hugepages(shp->shm_file) ?
                                &shm_file_operations_huge :
                                &shm_file_operations);
        if (!file)
                goto out_free;
-       ima_counts_get(file);
 
        file->private_data = sfd;
        file->f_mapping = shp->shm_file->f_mapping;
@@ -951,7 +966,7 @@ out_unlock:
 out_free:
        kfree(sfd);
 out_put_dentry:
-       dput(path.dentry);
+       path_put(&path);
        goto out_nattch;
 }
 
@@ -1073,6 +1088,9 @@ SYSCALL_DEFINE1(shmdt, char __user *, shmaddr)
 static int sysvipc_shm_proc_show(struct seq_file *s, void *it)
 {
        struct shmid_kernel *shp = it;
+       unsigned long rss = 0, swp = 0;
+
+       shm_add_rss_swap(shp, &rss, &swp);
 
 #if BITS_PER_LONG <= 32
 #define SIZE_SPEC "%10lu"
@@ -1082,7 +1100,8 @@ static int sysvipc_shm_proc_show(struct seq_file *s, void *it)
 
        return seq_printf(s,
                          "%10d %10d  %4o " SIZE_SPEC " %5u %5u  "
-                         "%5lu %5u %5u %5u %5u %10lu %10lu %10lu\n",
+                         "%5lu %5u %5u %5u %5u %10lu %10lu %10lu "
+                         SIZE_SPEC " " SIZE_SPEC "\n",
                          shp->shm_perm.key,
                          shp->shm_perm.id,
                          shp->shm_perm.mode,
@@ -1096,6 +1115,8 @@ static int sysvipc_shm_proc_show(struct seq_file *s, void *it)
                          shp->shm_perm.cgid,
                          shp->shm_atim,
                          shp->shm_dtim,
-                         shp->shm_ctim);
+                         shp->shm_ctim,
+                         rss * PAGE_SIZE,
+                         swp * PAGE_SIZE);
 }
 #endif