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@xxxxxxxxxx>
---
include/linux/shmem_fs.h | 2
init/main.c | 2
mm/shmem.c | 216 ++++++++++++++++++-------------------
3 files changed, 109 insertions(+), 111 deletions(-)
--- linux.orig/include/linux/shmem_fs.h 2011-06-13 13:27:59.634657055 -0700
+++ linux/include/linux/shmem_fs.h 2011-06-13 13:28:25.822786909 -0700
@@ -47,7 +47,7 @@ static inline struct shmem_inode_info *S
/*
* Functions in mm/shmem.c called directly from elsewhere:
*/
-extern int init_tmpfs(void);
+extern int shmem_init(void);
extern int shmem_fill_super(struct super_block *sb, void *data, int silent);
extern struct file *shmem_file_setup(const char *name,
loff_t size, unsigned long flags);
--- linux.orig/init/main.c 2011-06-13 13:26:07.386100444 -0700
+++ linux/init/main.c 2011-06-13 13:28:25.822786909 -0700
@@ -714,7 +714,7 @@ static void __init do_basic_setup(void)
{
cpuset_init_smp();
usermodehelper_init();
- init_tmpfs();
+ shmem_init();
driver_init();
init_irq_proc();
do_ctors();
--- linux.orig/mm/shmem.c 2011-06-13 13:27:59.634657055 -0700
+++ linux/mm/shmem.c 2011-06-13 13:28:25.822786909 -0700
@@ -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 supe
}
/**
- * 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 ino
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, struc
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, struc
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 *
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_sbmpo
}
#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
}
#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_ge
* 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 inod
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_st
}
#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 fi
{
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 fi
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 *d
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(st
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_ca
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 i
/* 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);
}
@@ -2193,21 +2192,20 @@ static const struct vm_operations_struct
#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;
@@ -2215,18 +2213,18 @@ 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");
@@ -2235,9 +2233,9 @@ 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:
@@ -2247,37 +2245,37 @@ 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
@@ -2294,23 +2292,23 @@ 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;
}
@@ -2320,34 +2318,34 @@ int shmem_lock(struct file *file, int lo
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
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