X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=mm%2Fshmem.c;h=f7ac7b812f926a24b3ba71bb4757318ab75b357b;hb=2fcc3db0ccee9b47df7a4f732e6624f4f643c035;hp=dc25565a61e95c1aaacc8b4aa67b4c3862acea4a;hpb=7211bb9b64f17b23834d91fc3d0c1d78671ee9a8;p=powerpc.git

diff --git a/mm/shmem.c b/mm/shmem.c
index dc25565a61..f7ac7b812f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -457,7 +457,7 @@ static void shmem_free_pages(struct list_head *next)
 	} 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;
@@ -475,18 +475,27 @@ static void shmem_truncate(struct inode *inode)
 	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);
@@ -573,11 +582,12 @@ static void shmem_truncate(struct inode *inode)
 			set_page_private(subdir, page_private(subdir) - freed);
 			if (offset)
 				spin_unlock(&info->lock);
-			BUG_ON(page_private(subdir) > 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);
@@ -594,7 +604,7 @@ done2:
 		 * 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);
@@ -614,6 +624,11 @@ done2:
 	}
 }
 
+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;
@@ -855,7 +870,7 @@ unlock:
 	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
@@ -1013,6 +1028,14 @@ repeat:
 			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);
@@ -1255,7 +1278,7 @@ out_nomem:
 	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;
@@ -1301,7 +1324,8 @@ shmem_get_inode(struct super_block *sb, int mode, dev_t dev)
 		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++;
@@ -1315,7 +1339,8 @@ shmem_get_inode(struct super_block *sb, int mode, dev_t dev)
 			 * 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) {
@@ -1355,7 +1380,7 @@ shmem_file_write(struct file *file, const char __user *buf, size_t count, loff_t
 	if (!access_ok(VERIFY_READ, buf, count))
 		return -EFAULT;
 
-	down(&inode->i_sem);
+	mutex_lock(&inode->i_mutex);
 
 	pos = *ppos;
 	written = 0;
@@ -1440,7 +1465,7 @@ shmem_file_write(struct file *file, const char __user *buf, size_t count, loff_t
 	if (written)
 		err = written;
 out:
-	up(&inode->i_sem);
+	mutex_unlock(&inode->i_mutex);
 	return err;
 }
 
@@ -1476,7 +1501,7 @@ static void do_shmem_file_read(struct file *filp, loff_t *ppos, read_descriptor_
 
 		/*
 		 * 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);
@@ -1828,7 +1853,9 @@ static struct inode_operations shmem_symlink_inode_operations = {
 	.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;
 
@@ -1882,6 +1909,19 @@ static int shmem_parse_options(char *options, int *mode, uid_t *uid, gid_t *gid,
 			*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);
@@ -1902,12 +1942,14 @@ static int shmem_remount_fs(struct super_block *sb, int *flags, char *data)
 	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);
@@ -1933,6 +1975,8 @@ static int shmem_remount_fs(struct super_block *sb, int *flags, char *data)
 	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;
@@ -1957,6 +2001,8 @@ static int shmem_fill_super(struct super_block *sb,
 	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
 	/*
@@ -1969,8 +2015,8 @@ static int shmem_fill_super(struct super_block *sb,
 		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
@@ -1988,6 +2034,8 @@ static int shmem_fill_super(struct super_block *sb,
 	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;
@@ -2083,6 +2131,7 @@ static struct file_operations shmem_file_operations = {
 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 = {