tmpfs: miscellaneous trivial cleanups

While it's at its least, make a number of boring nitpicky cleanups to
shmem.c, mostly for consistency of variable naming.  Things like "swap"
instead of "entry", "pgoff_t index" instead of "unsigned long idx".

And since everything else here is prefixed "shmem_", better change
init_tmpfs() to shmem_init().

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 107 insertions, 109 deletions

diff --git a/mm/shmem.c b/mm/shmem.c
index 5574b00ca77..24e95ac1605 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -28,7 +28,6 @@
 #include <linux/file.h>
 #include <linux/mm.h>
 #include <linux/module.h>
-#include <linux/percpu_counter.h>
 #include <linux/swap.h>
 
 static struct vfsmount *shm_mnt;
@@ -51,6 +50,7 @@ static struct vfsmount *shm_mnt;
 #include <linux/shmem_fs.h>
 #include <linux/writeback.h>
 #include <linux/blkdev.h>
+#include <linux/percpu_counter.h>
 #include <linux/splice.h>
 #include <linux/security.h>
 #include <linux/swapops.h>
@@ -63,7 +63,6 @@ static struct vfsmount *shm_mnt;
 #include <linux/magic.h>
 
 #include <asm/uaccess.h>
-#include <asm/div64.h>
 #include <asm/pgtable.h>
 
 #define BLOCKS_PER_PAGE  (PAGE_CACHE_SIZE/512)
@@ -201,7 +200,7 @@ static void shmem_free_inode(struct super_block *sb)
 }
 
 /**
- * shmem_recalc_inode - recalculate the size of an inode
+ * shmem_recalc_inode - recalculate the block usage of an inode
  * @inode: inode to recalc
  *
  * We have to calculate the free blocks since the mm can drop
@@ -356,19 +355,20 @@ static void shmem_evict_inode(struct inode *inode)
         end_writeback(inode);
 }
 
-static int shmem_unuse_inode(struct shmem_inode_info *info, swp_entry_t entry, struct page *page)
+static int shmem_unuse_inode(struct shmem_inode_info *info,
+                             swp_entry_t swap, struct page *page)
 {
         struct address_space *mapping = info->vfs_inode.i_mapping;
-        unsigned long idx;
+        pgoff_t index;
         int error;
 
-        for (idx = 0; idx < SHMEM_NR_DIRECT; idx++)
-                if (shmem_get_swap(info, idx).val == entry.val)
+        for (index = 0; index < SHMEM_NR_DIRECT; index++)
+                if (shmem_get_swap(info, index).val == swap.val)
                         goto found;
         return 0;
 found:
         spin_lock(&info->lock);
-        if (shmem_get_swap(info, idx).val != entry.val) {
+        if (shmem_get_swap(info, index).val != swap.val) {
                 spin_unlock(&info->lock);
                 return 0;
         }
@@ -387,15 +387,15 @@ found:
          * but also to hold up shmem_evict_inode(): so inode cannot be freed
          * beneath us (pagelock doesn't help until the page is in pagecache).
          */
-        error = add_to_page_cache_locked(page, mapping, idx, GFP_NOWAIT);
+        error = add_to_page_cache_locked(page, mapping, index, GFP_NOWAIT);
         /* which does mem_cgroup_uncharge_cache_page on error */
 
         if (error != -ENOMEM) {
                 delete_from_swap_cache(page);
                 set_page_dirty(page);
-                shmem_put_swap(info, idx, (swp_entry_t){0});
+                shmem_put_swap(info, index, (swp_entry_t){0});
                 info->swapped--;
-                swap_free(entry);
+                swap_free(swap);
                 error = 1;      /* not an error, but entry was found */
         }
         spin_unlock(&info->lock);
@@ -405,9 +405,9 @@ found:
 /*
  * shmem_unuse() search for an eventually swapped out shmem page.
  */
-int shmem_unuse(swp_entry_t entry, struct page *page)
+int shmem_unuse(swp_entry_t swap, struct page *page)
 {
-        struct list_head *p, *next;
+        struct list_head *this, *next;
         struct shmem_inode_info *info;
         int found = 0;
         int error;
@@ -432,8 +432,8 @@ int shmem_unuse(swp_entry_t entry, struct page *page)
         radix_tree_preload_end();
 
         mutex_lock(&shmem_swaplist_mutex);
-        list_for_each_safe(p, next, &shmem_swaplist) {
-                info = list_entry(p, struct shmem_inode_info, swaplist);
+        list_for_each_safe(this, next, &shmem_swaplist) {
+                info = list_entry(this, struct shmem_inode_info, swaplist);
                 if (!info->swapped) {
                         spin_lock(&info->lock);
                         if (!info->swapped)
@@ -441,7 +441,7 @@ int shmem_unuse(swp_entry_t entry, struct page *page)
                         spin_unlock(&info->lock);
                 }
                 if (info->swapped)
-                        found = shmem_unuse_inode(info, entry, page);
+                        found = shmem_unuse_inode(info, swap, page);
                 cond_resched();
                 if (found)
                         break;
@@ -467,7 +467,7 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc)
         struct shmem_inode_info *info;
         swp_entry_t swap, oswap;
         struct address_space *mapping;
-        unsigned long index;
+        pgoff_t index;
         struct inode *inode;
 
         BUG_ON(!PageLocked(page));
@@ -577,35 +577,33 @@ static struct mempolicy *shmem_get_sbmpol(struct shmem_sb_info *sbinfo)
 }
 #endif /* CONFIG_TMPFS */
 
-static struct page *shmem_swapin(swp_entry_t entry, gfp_t gfp,
-                        struct shmem_inode_info *info, unsigned long idx)
+static struct page *shmem_swapin(swp_entry_t swap, gfp_t gfp,
+                        struct shmem_inode_info *info, pgoff_t index)
 {
         struct mempolicy mpol, *spol;
         struct vm_area_struct pvma;
-        struct page *page;
 
         spol = mpol_cond_copy(&mpol,
-                                mpol_shared_policy_lookup(&info->policy, idx));
+                        mpol_shared_policy_lookup(&info->policy, index));
 
         /* Create a pseudo vma that just contains the policy */
         pvma.vm_start = 0;
-        pvma.vm_pgoff = idx;
+        pvma.vm_pgoff = index;
         pvma.vm_ops = NULL;
         pvma.vm_policy = spol;
-        page = swapin_readahead(entry, gfp, &pvma, 0);
-        return page;
+        return swapin_readahead(swap, gfp, &pvma, 0);
 }
 
 static struct page *shmem_alloc_page(gfp_t gfp,
-                        struct shmem_inode_info *info, unsigned long idx)
+                        struct shmem_inode_info *info, pgoff_t index)
 {
         struct vm_area_struct pvma;
 
         /* Create a pseudo vma that just contains the policy */
         pvma.vm_start = 0;
-        pvma.vm_pgoff = idx;
+        pvma.vm_pgoff = index;
         pvma.vm_ops = NULL;
-        pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, idx);
+        pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, index);
 
         /*
          * alloc_page_vma() will drop the shared policy reference
@@ -614,19 +612,19 @@ static struct page *shmem_alloc_page(gfp_t gfp,
 }
 #else /* !CONFIG_NUMA */
 #ifdef CONFIG_TMPFS
-static inline void shmem_show_mpol(struct seq_file *seq, struct mempolicy *p)
+static inline void shmem_show_mpol(struct seq_file *seq, struct mempolicy *mpol)
 {
 }
 #endif /* CONFIG_TMPFS */
 
-static inline struct page *shmem_swapin(swp_entry_t entry, gfp_t gfp,
-                        struct shmem_inode_info *info, unsigned long idx)
+static inline struct page *shmem_swapin(swp_entry_t swap, gfp_t gfp,
+                        struct shmem_inode_info *info, pgoff_t index)
 {
-        return swapin_readahead(entry, gfp, NULL, 0);
+        return swapin_readahead(swap, gfp, NULL, 0);
 }
 
 static inline struct page *shmem_alloc_page(gfp_t gfp,
-                        struct shmem_inode_info *info, unsigned long idx)
+                        struct shmem_inode_info *info, pgoff_t index)
 {
         return alloc_page(gfp);
 }
@@ -646,7 +644,7 @@ static inline struct mempolicy *shmem_get_sbmpol(struct shmem_sb_info *sbinfo)
  * vm. If we swap it in we mark it dirty since we also free the swap
  * entry since a page cannot live in both the swap and page cache
  */
-static int shmem_getpage_gfp(struct inode *inode, pgoff_t idx,
+static int shmem_getpage_gfp(struct inode *inode, pgoff_t index,
         struct page **pagep, enum sgp_type sgp, gfp_t gfp, int *fault_type)
 {
         struct address_space *mapping = inode->i_mapping;
@@ -657,10 +655,10 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t idx,
         swp_entry_t swap;
         int error;
 
-        if (idx > (MAX_LFS_FILESIZE >> PAGE_CACHE_SHIFT))
+        if (index > (MAX_LFS_FILESIZE >> PAGE_CACHE_SHIFT))
                 return -EFBIG;
 repeat:
-        page = find_lock_page(mapping, idx);
+        page = find_lock_page(mapping, index);
         if (page) {
                 /*
                  * Once we can get the page lock, it must be uptodate:
@@ -681,7 +679,7 @@ repeat:
         radix_tree_preload_end();
 
         if (sgp != SGP_READ && !prealloc_page) {
-                prealloc_page = shmem_alloc_page(gfp, info, idx);
+                prealloc_page = shmem_alloc_page(gfp, info, index);
                 if (prealloc_page) {
                         SetPageSwapBacked(prealloc_page);
                         if (mem_cgroup_cache_charge(prealloc_page,
@@ -694,7 +692,7 @@ repeat:
 
         spin_lock(&info->lock);
         shmem_recalc_inode(inode);
-        swap = shmem_get_swap(info, idx);
+        swap = shmem_get_swap(info, index);
         if (swap.val) {
                 /* Look it up and read it in.. */
                 page = lookup_swap_cache(swap);
@@ -703,9 +701,9 @@ repeat:
                         /* here we actually do the io */
                         if (fault_type)
                                 *fault_type |= VM_FAULT_MAJOR;
-                        page = shmem_swapin(swap, gfp, info, idx);
+                        page = shmem_swapin(swap, gfp, info, index);
                         if (!page) {
-                                swp_entry_t nswap = shmem_get_swap(info, idx);
+                                swp_entry_t nswap = shmem_get_swap(info, index);
                                 if (nswap.val == swap.val) {
                                         error = -ENOMEM;
                                         goto out;
@@ -740,7 +738,7 @@ repeat:
                 }
 
                 error = add_to_page_cache_locked(page, mapping,
-                                                 idx, GFP_NOWAIT);
+                                                 index, GFP_NOWAIT);
                 if (error) {
                         spin_unlock(&info->lock);
                         if (error == -ENOMEM) {
@@ -762,14 +760,14 @@ repeat:
                 }
 
                 delete_from_swap_cache(page);
-                shmem_put_swap(info, idx, (swp_entry_t){0});
+                shmem_put_swap(info, index, (swp_entry_t){0});
                 info->swapped--;
                 spin_unlock(&info->lock);
                 set_page_dirty(page);
                 swap_free(swap);
 
         } else if (sgp == SGP_READ) {
-                page = find_get_page(mapping, idx);
+                page = find_get_page(mapping, index);
                 if (page && !trylock_page(page)) {
                         spin_unlock(&info->lock);
                         wait_on_page_locked(page);
@@ -793,12 +791,12 @@ repeat:
                 page = prealloc_page;
                 prealloc_page = NULL;
 
-                swap = shmem_get_swap(info, idx);
+                swap = shmem_get_swap(info, index);
                 if (swap.val)
                         mem_cgroup_uncharge_cache_page(page);
                 else
                         error = add_to_page_cache_lru(page, mapping,
-                                                idx, GFP_NOWAIT);
+                                                index, GFP_NOWAIT);
                 /*
                  * At add_to_page_cache_lru() failure,
                  * uncharge will be done automatically.
@@ -841,7 +839,7 @@ nospace:
          * but must also avoid reporting a spurious ENOSPC while working on a
          * full tmpfs.
          */
-        page = find_get_page(mapping, idx);
+        page = find_get_page(mapping, index);
         spin_unlock(&info->lock);
         if (page) {
                 page_cache_release(page);
@@ -872,20 +870,20 @@ static int shmem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 }
 
 #ifdef CONFIG_NUMA
-static int shmem_set_policy(struct vm_area_struct *vma, struct mempolicy *new)
+static int shmem_set_policy(struct vm_area_struct *vma, struct mempolicy *mpol)
 {
-        struct inode *i = vma->vm_file->f_path.dentry->d_inode;
-        return mpol_set_shared_policy(&SHMEM_I(i)->policy, vma, new);
+        struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
+        return mpol_set_shared_policy(&SHMEM_I(inode)->policy, vma, mpol);
 }
 
 static struct mempolicy *shmem_get_policy(struct vm_area_struct *vma,
                                           unsigned long addr)
 {
-        struct inode *i = vma->vm_file->f_path.dentry->d_inode;
-        unsigned long idx;
+        struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
+        pgoff_t index;
 
-        idx = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
-        return mpol_shared_policy_lookup(&SHMEM_I(i)->policy, idx);
+        index = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
+        return mpol_shared_policy_lookup(&SHMEM_I(inode)->policy, index);
 }
 #endif
 
@@ -1016,7 +1014,8 @@ static void do_shmem_file_read(struct file *filp, loff_t *ppos, read_descriptor_
 {
         struct inode *inode = filp->f_path.dentry->d_inode;
         struct address_space *mapping = inode->i_mapping;
-        unsigned long index, offset;
+        pgoff_t index;
+        unsigned long offset;
         enum sgp_type sgp = SGP_READ;
 
         /*
@@ -1032,7 +1031,8 @@ static void do_shmem_file_read(struct file *filp, loff_t *ppos, read_descriptor_
 
         for (;;) {
                 struct page *page = NULL;
-                unsigned long end_index, nr, ret;
+                pgoff_t end_index;
+                unsigned long nr, ret;
                 loff_t i_size = i_size_read(inode);
 
                 end_index = i_size >> PAGE_CACHE_SHIFT;
@@ -1270,8 +1270,9 @@ static int shmem_statfs(struct dentry *dentry, struct kstatfs *buf)
         buf->f_namelen = NAME_MAX;
         if (sbinfo->max_blocks) {
                 buf->f_blocks = sbinfo->max_blocks;
-                buf->f_bavail = buf->f_bfree =
-                                sbinfo->max_blocks - percpu_counter_sum(&sbinfo->used_blocks);
+                buf->f_bavail =
+                buf->f_bfree  = sbinfo->max_blocks -
+                                percpu_counter_sum(&sbinfo->used_blocks);
         }
         if (sbinfo->max_inodes) {
                 buf->f_files = sbinfo->max_inodes;
@@ -1480,8 +1481,8 @@ static void *shmem_follow_link_inline(struct dentry *dentry, struct nameidata *n
 static void *shmem_follow_link(struct dentry *dentry, struct nameidata *nd)
 {
         struct page *page = NULL;
-        int res = shmem_getpage(dentry->d_inode, 0, &page, SGP_READ, NULL);
-        nd_set_link(nd, res ? ERR_PTR(res) : kmap(page));
+        int error = shmem_getpage(dentry->d_inode, 0, &page, SGP_READ, NULL);
+        nd_set_link(nd, error ? ERR_PTR(error) : kmap(page));
         if (page)
                 unlock_page(page);
         return page;
@@ -1592,7 +1593,6 @@ out:
         return err;
 }
 
-
 static const struct xattr_handler *shmem_xattr_handlers[] = {
 #ifdef CONFIG_TMPFS_POSIX_ACL
         &generic_acl_access_handler,
@@ -2052,14 +2052,14 @@ static struct kmem_cache *shmem_inode_cachep;
 
 static struct inode *shmem_alloc_inode(struct super_block *sb)
 {
-        struct shmem_inode_info *p;
-        p = (struct shmem_inode_info *)kmem_cache_alloc(shmem_inode_cachep, GFP_KERNEL);
-        if (!p)
+        struct shmem_inode_info *info;
+        info = kmem_cache_alloc(shmem_inode_cachep, GFP_KERNEL);
+        if (!info)
                 return NULL;
-        return &p->vfs_inode;
+        return &info->vfs_inode;
 }
 
-static void shmem_i_callback(struct rcu_head *head)
+static void shmem_destroy_callback(struct rcu_head *head)
 {
         struct inode *inode = container_of(head, struct inode, i_rcu);
         INIT_LIST_HEAD(&inode->i_dentry);
@@ -2072,25 +2072,24 @@ static void shmem_destroy_inode(struct inode *inode)
                 /* only struct inode is valid if it's an inline symlink */
                 mpol_free_shared_policy(&SHMEM_I(inode)->policy);
         }
-        call_rcu(&inode->i_rcu, shmem_i_callback);
+        call_rcu(&inode->i_rcu, shmem_destroy_callback);
 }
 
-static void init_once(void *foo)
+static void shmem_init_inode(void *foo)
 {
-        struct shmem_inode_info *p = (struct shmem_inode_info *) foo;
-
-        inode_init_once(&p->vfs_inode);
+        struct shmem_inode_info *info = foo;
+        inode_init_once(&info->vfs_inode);
 }
 
-static int init_inodecache(void)
+static int shmem_init_inodecache(void)
 {
         shmem_inode_cachep = kmem_cache_create("shmem_inode_cache",
                                 sizeof(struct shmem_inode_info),
-                                0, SLAB_PANIC, init_once);
+                                0, SLAB_PANIC, shmem_init_inode);
         return 0;
 }
 
-static void destroy_inodecache(void)
+static void shmem_destroy_inodecache(void)
 {
         kmem_cache_destroy(shmem_inode_cachep);
 }
@@ -2187,21 +2186,20 @@ static const struct vm_operations_struct shmem_vm_ops = {
 #endif
 };
 
-
 static struct dentry *shmem_mount(struct file_system_type *fs_type,
         int flags, const char *dev_name, void *data)
 {
         return mount_nodev(fs_type, flags, data, shmem_fill_super);
 }
 
-static struct file_system_type tmpfs_fs_type = {
+static struct file_system_type shmem_fs_type = {
         .owner          = THIS_MODULE,
         .name           = "tmpfs",
         .mount          = shmem_mount,
         .kill_sb        = kill_litter_super,
 };
 
-int __init init_tmpfs(void)
+int __init shmem_init(void)
 {
         int error;
 
@@ -2209,18 +2207,18 @@ int __init init_tmpfs(void)
         if (error)
                 goto out4;
 
-        error = init_inodecache();
+        error = shmem_init_inodecache();
         if (error)
                 goto out3;
 
-        error = register_filesystem(&tmpfs_fs_type);
+        error = register_filesystem(&shmem_fs_type);
         if (error) {
                 printk(KERN_ERR "Could not register tmpfs\n");
                 goto out2;
         }
 
-        shm_mnt = vfs_kern_mount(&tmpfs_fs_type, MS_NOUSER,
-                                tmpfs_fs_type.name, NULL);
+        shm_mnt = vfs_kern_mount(&shmem_fs_type, MS_NOUSER,
+                                 shmem_fs_type.name, NULL);
         if (IS_ERR(shm_mnt)) {
                 error = PTR_ERR(shm_mnt);
                 printk(KERN_ERR "Could not kern_mount tmpfs\n");
@@ -2229,9 +2227,9 @@ int __init init_tmpfs(void)
         return 0;
 
 out1:
-        unregister_filesystem(&tmpfs_fs_type);
+        unregister_filesystem(&shmem_fs_type);
 out2:
-        destroy_inodecache();
+        shmem_destroy_inodecache();
 out3:
         bdi_destroy(&shmem_backing_dev_info);
 out4:
@@ -2241,37 +2239,37 @@ out4:
 
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
 /**
- * mem_cgroup_get_shmem_target - find a page or entry assigned to the shmem file
+ * mem_cgroup_get_shmem_target - find page or swap assigned to the shmem file
  * @inode: the inode to be searched
- * @pgoff: the offset to be searched
+ * @index: the page offset to be searched
  * @pagep: the pointer for the found page to be stored
- * @ent: the pointer for the found swap entry to be stored
+ * @swapp: the pointer for the found swap entry to be stored
  *
  * If a page is found, refcount of it is incremented. Callers should handle
  * these refcount.
  */
-void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t pgoff,
-                                        struct page **pagep, swp_entry_t *ent)
+void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t index,
+                                 struct page **pagep, swp_entry_t *swapp)
 {
-        swp_entry_t entry = { .val = 0 };
-        struct page *page = NULL;
         struct shmem_inode_info *info = SHMEM_I(inode);
+        struct page *page = NULL;
+        swp_entry_t swap = {0};
 
-        if ((pgoff << PAGE_CACHE_SHIFT) >= i_size_read(inode))
+        if ((index << PAGE_CACHE_SHIFT) >= i_size_read(inode))
                 goto out;
 
         spin_lock(&info->lock);
 #ifdef CONFIG_SWAP
-        entry = shmem_get_swap(info, pgoff);
-        if (entry.val)
-                page = find_get_page(&swapper_space, entry.val);
+        swap = shmem_get_swap(info, index);
+        if (swap.val)
+                page = find_get_page(&swapper_space, swap.val);
         else
 #endif
-                page = find_get_page(inode->i_mapping, pgoff);
+                page = find_get_page(inode->i_mapping, index);
         spin_unlock(&info->lock);
 out:
         *pagep = page;
-        *ent = entry;
+        *swapp = swap;
 }
 #endif
 
@@ -2288,23 +2286,23 @@ out:
 
 #include <linux/ramfs.h>
 
-static struct file_system_type tmpfs_fs_type = {
+static struct file_system_type shmem_fs_type = {
         .name           = "tmpfs",
         .mount          = ramfs_mount,
         .kill_sb        = kill_litter_super,
 };
 
-int __init init_tmpfs(void)
+int __init shmem_init(void)
 {
-        BUG_ON(register_filesystem(&tmpfs_fs_type) != 0);
+        BUG_ON(register_filesystem(&shmem_fs_type) != 0);
 
-        shm_mnt = kern_mount(&tmpfs_fs_type);
+        shm_mnt = kern_mount(&shmem_fs_type);
         BUG_ON(IS_ERR(shm_mnt));
 
         return 0;
 }
 
-int shmem_unuse(swp_entry_t entry, struct page *page)
+int shmem_unuse(swp_entry_t swap, struct page *page)
 {
         return 0;
 }
@@ -2314,34 +2312,34 @@ int shmem_lock(struct file *file, int lock, struct user_struct *user)
         return 0;
 }
 
-void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end)
+void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend)
 {
-        truncate_inode_pages_range(inode->i_mapping, start, end);
+        truncate_inode_pages_range(inode->i_mapping, lstart, lend);
 }
 EXPORT_SYMBOL_GPL(shmem_truncate_range);
 
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
 /**
- * mem_cgroup_get_shmem_target - find a page or entry assigned to the shmem file
+ * mem_cgroup_get_shmem_target - find page or swap assigned to the shmem file
  * @inode: the inode to be searched
- * @pgoff: the offset to be searched
+ * @index: the page offset to be searched
  * @pagep: the pointer for the found page to be stored
- * @ent: the pointer for the found swap entry to be stored
+ * @swapp: the pointer for the found swap entry to be stored
  *
  * If a page is found, refcount of it is incremented. Callers should handle
  * these refcount.
  */
-void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t pgoff,
-                                        struct page **pagep, swp_entry_t *ent)
+void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t index,
+                                 struct page **pagep, swp_entry_t *swapp)
 {
         struct page *page = NULL;
 
-        if ((pgoff << PAGE_CACHE_SHIFT) >= i_size_read(inode))
+        if ((index << PAGE_CACHE_SHIFT) >= i_size_read(inode))
                 goto out;
-        page = find_get_page(inode->i_mapping, pgoff);
+        page = find_get_page(inode->i_mapping, index);
 out:
         *pagep = page;
-        *ent = (swp_entry_t){ .val = 0 };
+        *swapp = (swp_entry_t){0};
 }
 #endif