/* Pretend that each entry is of this size in directory's i_size */
#define BOGO_DIRENT_SIZE 20
-/* Keep swapped page count in private field of indirect struct page */
-#define nr_swapped private
-
/* Flag allocation requirements to shmem_getpage and shmem_swp_alloc */
enum sgp_type {
SGP_QUICK, /* don't try more than file page cache lookup */
static int shmem_getpage(struct inode *inode, unsigned long idx,
struct page **pagep, enum sgp_type sgp, int *type);
-static inline struct page *shmem_dir_alloc(unsigned int gfp_mask)
+static inline struct page *shmem_dir_alloc(gfp_t gfp_mask)
{
/*
* The above definition of ENTRIES_PER_PAGE, and the use of
entry->val = value;
info->swapped += incdec;
- if ((unsigned long)(entry - info->i_direct) >= SHMEM_NR_DIRECT)
- kmap_atomic_to_page(entry)->nr_swapped += incdec;
+ if ((unsigned long)(entry - info->i_direct) >= SHMEM_NR_DIRECT) {
+ struct page *page = kmap_atomic_to_page(entry);
+ set_page_private(page, page_private(page) + incdec);
+ }
}
/*
spin_unlock(&info->lock);
page = shmem_dir_alloc(mapping_gfp_mask(inode->i_mapping) | __GFP_ZERO);
- if (page) {
- page->nr_swapped = 0;
- }
+ if (page)
+ set_page_private(page, 0);
spin_lock(&info->lock);
if (!page) {
} while (next);
}
-static void shmem_truncate(struct inode *inode)
+static void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end)
{
struct shmem_inode_info *info = SHMEM_I(inode);
unsigned long idx;
long nr_swaps_freed = 0;
int offset;
int freed;
+ int punch_hole = 0;
inode->i_ctime = inode->i_mtime = CURRENT_TIME;
- idx = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+ idx = (start + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
if (idx >= info->next_index)
return;
spin_lock(&info->lock);
info->flags |= SHMEM_TRUNCATE;
- limit = info->next_index;
- info->next_index = idx;
+ if (likely(end == (loff_t) -1)) {
+ limit = info->next_index;
+ info->next_index = idx;
+ } else {
+ limit = (end + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+ if (limit > info->next_index)
+ limit = info->next_index;
+ punch_hole = 1;
+ }
+
topdir = info->i_indirect;
- if (topdir && idx <= SHMEM_NR_DIRECT) {
+ if (topdir && idx <= SHMEM_NR_DIRECT && !punch_hole) {
info->i_indirect = NULL;
nr_pages_to_free++;
list_add(&topdir->lru, &pages_to_free);
diroff = 0;
}
subdir = dir[diroff];
- if (subdir && subdir->nr_swapped) {
+ if (subdir && page_private(subdir)) {
size = limit - idx;
if (size > ENTRIES_PER_PAGE)
size = ENTRIES_PER_PAGE;
nr_swaps_freed += freed;
if (offset)
spin_lock(&info->lock);
- subdir->nr_swapped -= freed;
+ set_page_private(subdir, page_private(subdir) - freed);
if (offset)
spin_unlock(&info->lock);
- BUG_ON(subdir->nr_swapped > offset);
+ if (!punch_hole)
+ BUG_ON(page_private(subdir) > offset);
}
if (offset)
offset = 0;
- else if (subdir) {
+ else if (subdir && !page_private(subdir)) {
dir[diroff] = NULL;
nr_pages_to_free++;
list_add(&subdir->lru, &pages_to_free);
* Also, though shmem_getpage checks i_size before adding to
* cache, no recheck after: so fix the narrow window there too.
*/
- truncate_inode_pages(inode->i_mapping, inode->i_size);
+ truncate_inode_pages_range(inode->i_mapping, start, end);
}
spin_lock(&info->lock);
}
}
+static void shmem_truncate(struct inode *inode)
+{
+ shmem_truncate_range(inode, inode->i_size, (loff_t)-1);
+}
+
static int shmem_notify_change(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
dir = shmem_dir_map(subdir);
}
subdir = *dir;
- if (subdir && subdir->nr_swapped) {
+ if (subdir && page_private(subdir)) {
ptr = shmem_swp_map(subdir);
size = limit - idx;
if (size > ENTRIES_PER_PAGE)
swap_free(swap);
redirty:
set_page_dirty(page);
- return WRITEPAGE_ACTIVATE; /* Return with the page locked */
+ return AOP_WRITEPAGE_ACTIVATE; /* Return with the page locked */
}
#ifdef CONFIG_NUMA
}
static struct page *
-shmem_alloc_page(unsigned long gfp, struct shmem_inode_info *info,
+shmem_alloc_page(gfp_t gfp, struct shmem_inode_info *info,
unsigned long idx)
{
struct vm_area_struct pvma;
page_cache_release(swappage);
goto repeat;
}
+ if (!PageSwapCache(swappage)) {
+ /* Page migration has occured */
+ shmem_swp_unmap(entry);
+ spin_unlock(&info->lock);
+ unlock_page(swappage);
+ page_cache_release(swappage);
+ goto repeat;
+ }
if (PageWriteback(swappage)) {
shmem_swp_unmap(entry);
spin_unlock(&info->lock);
page_cache_release(page);
return err;
}
- } else {
+ } else if (vma->vm_flags & VM_NONLINEAR) {
/* No page was found just because we can't read it in
* now (being here implies nonblock != 0), but the page
* may exist, so set the PTE to fault it in later. */
return retval;
}
-static int shmem_mmap(struct file *file, struct vm_area_struct *vma)
+int shmem_mmap(struct file *file, struct vm_area_struct *vma)
{
file_accessed(file);
vma->vm_ops = &shmem_vm_ops;
case S_IFREG:
inode->i_op = &shmem_inode_operations;
inode->i_fop = &shmem_file_operations;
- mpol_shared_policy_init(&info->policy);
+ mpol_shared_policy_init(&info->policy, sbinfo->policy,
+ &sbinfo->policy_nodes);
break;
case S_IFDIR:
inode->i_nlink++;
* Must not load anything in the rbtree,
* mpol_free_shared_policy will not be called.
*/
- mpol_shared_policy_init(&info->policy);
+ mpol_shared_policy_init(&info->policy, MPOL_DEFAULT,
+ NULL);
break;
}
} else if (sbinfo->max_inodes) {
if (!access_ok(VERIFY_READ, buf, count))
return -EFAULT;
- down(&inode->i_sem);
+ mutex_lock(&inode->i_mutex);
pos = *ppos;
written = 0;
if (written)
err = written;
out:
- up(&inode->i_sem);
+ mutex_unlock(&inode->i_mutex);
return err;
}
/*
* We must evaluate after, since reads (unlike writes)
- * are called without i_sem protection against truncate
+ * are called without i_mutex protection against truncate
*/
nr = PAGE_CACHE_SIZE;
i_size = i_size_read(inode);
*/
if (!offset)
mark_page_accessed(page);
- } else
+ } else {
page = ZERO_PAGE(0);
+ page_cache_get(page);
+ }
/*
* Ok, we have the page, and it's up-to-date, so
.put_link = shmem_put_link,
};
-static int shmem_parse_options(char *options, int *mode, uid_t *uid, gid_t *gid, unsigned long *blocks, unsigned long *inodes)
+static int shmem_parse_options(char *options, int *mode, uid_t *uid,
+ gid_t *gid, unsigned long *blocks, unsigned long *inodes,
+ int *policy, nodemask_t *policy_nodes)
{
char *this_char, *value, *rest;
*gid = simple_strtoul(value,&rest,0);
if (*rest)
goto bad_val;
+ } else if (!strcmp(this_char,"mpol")) {
+ if (!strcmp(value,"default"))
+ *policy = MPOL_DEFAULT;
+ else if (!strcmp(value,"preferred"))
+ *policy = MPOL_PREFERRED;
+ else if (!strcmp(value,"bind"))
+ *policy = MPOL_BIND;
+ else if (!strcmp(value,"interleave"))
+ *policy = MPOL_INTERLEAVE;
+ else
+ goto bad_val;
+ } else if (!strcmp(this_char,"mpol_nodelist")) {
+ nodelist_parse(value, *policy_nodes);
} else {
printk(KERN_ERR "tmpfs: Bad mount option %s\n",
this_char);
struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
unsigned long max_blocks = sbinfo->max_blocks;
unsigned long max_inodes = sbinfo->max_inodes;
+ int policy = sbinfo->policy;
+ nodemask_t policy_nodes = sbinfo->policy_nodes;
unsigned long blocks;
unsigned long inodes;
int error = -EINVAL;
- if (shmem_parse_options(data, NULL, NULL, NULL,
- &max_blocks, &max_inodes))
+ if (shmem_parse_options(data, NULL, NULL, NULL, &max_blocks,
+ &max_inodes, &policy, &policy_nodes))
return error;
spin_lock(&sbinfo->stat_lock);
sbinfo->free_blocks = max_blocks - blocks;
sbinfo->max_inodes = max_inodes;
sbinfo->free_inodes = max_inodes - inodes;
+ sbinfo->policy = policy;
+ sbinfo->policy_nodes = policy_nodes;
out:
spin_unlock(&sbinfo->stat_lock);
return error;
struct shmem_sb_info *sbinfo;
unsigned long blocks = 0;
unsigned long inodes = 0;
+ int policy = MPOL_DEFAULT;
+ nodemask_t policy_nodes = node_online_map;
#ifdef CONFIG_TMPFS
/*
inodes = totalram_pages - totalhigh_pages;
if (inodes > blocks)
inodes = blocks;
- if (shmem_parse_options(data, &mode, &uid, &gid,
- &blocks, &inodes))
+ if (shmem_parse_options(data, &mode, &uid, &gid, &blocks,
+ &inodes, &policy, &policy_nodes))
return -EINVAL;
}
#else
sbinfo->free_blocks = blocks;
sbinfo->max_inodes = inodes;
sbinfo->free_inodes = inodes;
+ sbinfo->policy = policy;
+ sbinfo->policy_nodes = policy_nodes;
sb->s_fs_info = sbinfo;
sb->s_maxbytes = SHMEM_MAX_BYTES;
static struct inode_operations shmem_inode_operations = {
.truncate = shmem_truncate,
.setattr = shmem_notify_change,
+ .truncate_range = shmem_truncate_range,
};
static struct inode_operations shmem_dir_inode_operations = {
git.openpandora.org / pandora-kernel.git / blobdiff