} while (next);
}
-static void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end)
+void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end)
{
struct shmem_inode_info *info = SHMEM_I(inode);
unsigned long idx;
spinlock_t *punch_lock;
unsigned long upper_limit;
+ truncate_inode_pages_range(inode->i_mapping, start, end);
+
inode->i_ctime = inode->i_mtime = CURRENT_TIME;
idx = (start + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
if (idx >= info->next_index)
* lowered next_index. Also, though shmem_getpage checks
* i_size before adding to cache, no recheck after: so fix the
* narrow window there too.
- *
- * Recalling truncate_inode_pages_range and unmap_mapping_range
- * every time for punch_hole (which never got a chance to clear
- * SHMEM_PAGEIN at the start of vmtruncate_range) is expensive,
- * yet hardly ever necessary: try to optimize them out later.
*/
truncate_inode_pages_range(inode->i_mapping, start, end);
- if (punch_hole)
- unmap_mapping_range(inode->i_mapping, start,
- end - start, 1);
}
spin_lock(&info->lock);
shmem_free_pages(pages_to_free.next);
}
}
+EXPORT_SYMBOL_GPL(shmem_truncate_range);
-static int shmem_notify_change(struct dentry *dentry, struct iattr *attr)
+static int shmem_setattr(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
- loff_t newsize = attr->ia_size;
int error;
error = inode_change_ok(inode, attr);
if (error)
return error;
- if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)
- && newsize != inode->i_size) {
+ if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) {
+ loff_t oldsize = inode->i_size;
+ loff_t newsize = attr->ia_size;
struct page *page = NULL;
- if (newsize < inode->i_size) {
+ if (newsize < oldsize) {
/*
* If truncating down to a partial page, then
* if that page is already allocated, hold it
spin_unlock(&info->lock);
}
}
-
- /* XXX(truncate): truncate_setsize should be called last */
- truncate_setsize(inode, newsize);
+ if (newsize != oldsize) {
+ i_size_write(inode, newsize);
+ inode->i_ctime = inode->i_mtime = CURRENT_TIME;
+ }
+ if (newsize < oldsize) {
+ loff_t holebegin = round_up(newsize, PAGE_SIZE);
+ unmap_mapping_range(inode->i_mapping, holebegin, 0, 1);
+ shmem_truncate_range(inode, newsize, (loff_t)-1);
+ /* unmap again to remove racily COWed private pages */
+ unmap_mapping_range(inode->i_mapping, holebegin, 0, 1);
+ }
if (page)
page_cache_release(page);
- shmem_truncate_range(inode, newsize, (loff_t)-1);
}
setattr_copy(inode, attr);
struct shmem_xattr *xattr, *nxattr;
if (inode->i_mapping->a_ops == &shmem_aops) {
- truncate_inode_pages(inode->i_mapping, 0);
shmem_unacct_size(info->flags, inode->i_size);
inode->i_size = 0;
shmem_truncate_range(inode, 0, (loff_t)-1);
delete_from_page_cache(page);
shmem_swp_set(info, entry, swap.val);
shmem_swp_unmap(entry);
- spin_unlock(&info->lock);
swap_shmem_alloc(swap);
+ spin_unlock(&info->lock);
BUG_ON(page_mapped(page));
swap_writepage(page, wbc);
return 0;
swappage = lookup_swap_cache(swap);
if (!swappage) {
shmem_swp_unmap(entry);
+ spin_unlock(&info->lock);
/* here we actually do the io */
- if (type && !(*type & VM_FAULT_MAJOR)) {
- __count_vm_event(PGMAJFAULT);
+ if (type)
*type |= VM_FAULT_MAJOR;
- }
- spin_unlock(&info->lock);
swappage = shmem_swapin(swap, gfp, info, idx);
if (!swappage) {
spin_lock(&info->lock);
error = shmem_getpage(inode, vmf->pgoff, &vmf->page, SGP_CACHE, &ret);
if (error)
return ((error == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS);
-
+ if (ret & VM_FAULT_MAJOR) {
+ count_vm_event(PGMAJFAULT);
+ mem_cgroup_count_vm_event(vma->vm_mm, PGMAJFAULT);
+ }
return ret | VM_FAULT_LOCKED;
}
};
static const struct inode_operations shmem_inode_operations = {
- .setattr = shmem_notify_change,
+ .setattr = shmem_setattr,
.truncate_range = shmem_truncate_range,
#ifdef CONFIG_TMPFS_XATTR
.setxattr = shmem_setxattr,
.removexattr = shmem_removexattr,
#endif
#ifdef CONFIG_TMPFS_POSIX_ACL
- .setattr = shmem_notify_change,
+ .setattr = shmem_setattr,
.check_acl = generic_check_acl,
#endif
};
.removexattr = shmem_removexattr,
#endif
#ifdef CONFIG_TMPFS_POSIX_ACL
- .setattr = shmem_notify_change,
+ .setattr = shmem_setattr,
.check_acl = generic_check_acl,
#endif
};
return 0;
}
+void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end)
+{
+ truncate_inode_pages_range(inode->i_mapping, start, end);
+}
+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
vma->vm_flags |= VM_CAN_NONLINEAR;
return 0;
}
+
+/**
+ * shmem_read_mapping_page_gfp - read into page cache, using specified page allocation flags.
+ * @mapping: the page's address_space
+ * @index: the page index
+ * @gfp: the page allocator flags to use if allocating
+ *
+ * This behaves as a tmpfs "read_cache_page_gfp(mapping, index, gfp)",
+ * with any new page allocations done using the specified allocation flags.
+ * But read_cache_page_gfp() uses the ->readpage() method: which does not
+ * suit tmpfs, since it may have pages in swapcache, and needs to find those
+ * for itself; although drivers/gpu/drm i915 and ttm rely upon this support.
+ *
+ * Provide a stub for those callers to start using now, then later
+ * flesh it out to call shmem_getpage() with additional gfp mask, when
+ * shmem_file_splice_read() is added and shmem_readpage() is removed.
+ */
+struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
+ pgoff_t index, gfp_t gfp)
+{
+ return read_cache_page_gfp(mapping, index, gfp);
+}
+EXPORT_SYMBOL_GPL(shmem_read_mapping_page_gfp);
git.openpandora.org / pandora-kernel.git / blobdiff