Merge branch 'next' into for-linus

[safe/jmp/linux-2.6] / mm / shmem.c

diff --git a/mm/shmem.c b/mm/shmem.c
index c1e5a3b..f1b0d48 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -50,14 +50,12 @@
 #include <linux/migrate.h>
 #include <linux/highmem.h>
 #include <linux/seq_file.h>
+#include <linux/magic.h>
 
 #include <asm/uaccess.h>
 #include <asm/div64.h>
 #include <asm/pgtable.h>
 
-/* This magic number is used in glibc for posix shared memory */
-#define TMPFS_MAGIC    0x01021994
-
 #define ENTRIES_PER_PAGE (PAGE_CACHE_SIZE/sizeof(unsigned long))
 #define ENTRIES_PER_PAGEPAGE (ENTRIES_PER_PAGE*ENTRIES_PER_PAGE)
 #define BLOCKS_PER_PAGE  (PAGE_CACHE_SIZE/512)
@@ -163,8 +161,8 @@ static inline struct shmem_sb_info *SHMEM_SB(struct super_block *sb)
  */
 static inline int shmem_acct_size(unsigned long flags, loff_t size)
 {
-       return (flags & VM_ACCOUNT)?
-               security_vm_enough_memory(VM_ACCT(size)): 0;
+       return (flags & VM_ACCOUNT) ?
+               security_vm_enough_memory_kern(VM_ACCT(size)) : 0;
 }
 
 static inline void shmem_unacct_size(unsigned long flags, loff_t size)
@@ -181,8 +179,8 @@ static inline void shmem_unacct_size(unsigned long flags, loff_t size)
  */
 static inline int shmem_acct_block(unsigned long flags)
 {
-       return (flags & VM_ACCOUNT)?
-               0: security_vm_enough_memory(VM_ACCT(PAGE_CACHE_SIZE));
+       return (flags & VM_ACCOUNT) ?
+               0 : security_vm_enough_memory_kern(VM_ACCT(PAGE_CACHE_SIZE));
 }
 
 static inline void shmem_unacct_blocks(unsigned long flags, long pages)
@@ -201,7 +199,7 @@ static struct vm_operations_struct shmem_vm_ops;
 
 static struct backing_dev_info shmem_backing_dev_info  __read_mostly = {
        .ra_pages       = 0,    /* No readahead */
-       .capabilities   = BDI_CAP_NO_ACCT_AND_WRITEBACK,
+       .capabilities   = BDI_CAP_NO_ACCT_AND_WRITEBACK | BDI_CAP_SWAP_BACKED,
        .unplug_io_fn   = default_unplug_io_fn,
 };
 
@@ -1265,7 +1263,7 @@ repeat:
                }
 
                /* We have to do this with page locked to prevent races */
-               if (TestSetPageLocked(swappage)) {
+               if (!trylock_page(swappage)) {
                        shmem_swp_unmap(entry);
                        spin_unlock(&info->lock);
                        wait_on_page_locked(swappage);
@@ -1329,7 +1327,7 @@ repeat:
                shmem_swp_unmap(entry);
                filepage = find_get_page(mapping, idx);
                if (filepage &&
-                   (!PageUptodate(filepage) || TestSetPageLocked(filepage))) {
+                   (!PageUptodate(filepage) || !trylock_page(filepage))) {
                        spin_unlock(&info->lock);
                        wait_on_page_locked(filepage);
                        page_cache_release(filepage);
@@ -1369,6 +1367,7 @@ repeat:
                                error = -ENOMEM;
                                goto failed;
                        }
+                       SetPageSwapBacked(filepage);
 
                        /* Precharge page while we can wait, compensate after */
                        error = mem_cgroup_cache_charge(filepage, current->mm,
@@ -1478,12 +1477,16 @@ int shmem_lock(struct file *file, int lock, struct user_struct *user)
                if (!user_shm_lock(inode->i_size, user))
                        goto out_nomem;
                info->flags |= VM_LOCKED;
+               mapping_set_unevictable(file->f_mapping);
        }
        if (!lock && (info->flags & VM_LOCKED) && user) {
                user_shm_unlock(inode->i_size, user);
                info->flags &= ~VM_LOCKED;
+               mapping_clear_unevictable(file->f_mapping);
+               scan_mapping_unevictable_pages(file->f_mapping);
        }
        retval = 0;
+
 out_nomem:
        spin_unlock(&info->lock);
        return retval;
@@ -1510,8 +1513,8 @@ shmem_get_inode(struct super_block *sb, int mode, dev_t dev)
        inode = new_inode(sb);
        if (inode) {
                inode->i_mode = mode;
-               inode->i_uid = current->fsuid;
-               inode->i_gid = current->fsgid;
+               inode->i_uid = current_fsuid();
+               inode->i_gid = current_fsgid();
                inode->i_blocks = 0;
                inode->i_mapping->backing_dev_info = &shmem_backing_dev_info;
                inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
@@ -2275,8 +2278,8 @@ static int shmem_fill_super(struct super_block *sb,
        sbinfo->max_blocks = 0;
        sbinfo->max_inodes = 0;
        sbinfo->mode = S_IRWXUGO | S_ISVTX;
-       sbinfo->uid = current->fsuid;
-       sbinfo->gid = current->fsgid;
+       sbinfo->uid = current_fsuid();
+       sbinfo->gid = current_fsgid();
        sbinfo->mpol = NULL;
        sb->s_fs_info = sbinfo;
 
@@ -2582,6 +2585,7 @@ put_memory:
        shmem_unacct_size(flags, size);
        return ERR_PTR(error);
 }
+EXPORT_SYMBOL_GPL(shmem_file_setup);
 
 /**
  * shmem_zero_setup - setup a shared anonymous mapping