1 files changed, 94 insertions, 8 deletions

diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index 0cc4ceec0562..32565dafa7f3 100644
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -16,11 +16,14 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/blkdev.h>
 #include <linux/fs.h>
 #include <linux/fs_context.h>
+#include <linux/fs_parser.h>
 #include <linux/vfs.h>
 #include <linux/slab.h>
 #include <linux/mutex.h>
+#include <linux/seq_file.h>
 #include <linux/pagemap.h>
 #include <linux/init.h>
 #include <linux/module.h>
@@ -37,6 +40,51 @@
 static struct file_system_type squashfs_fs_type;
 static const struct super_operations squashfs_super_ops;
 
+enum Opt_errors {
+	Opt_errors_continue,
+	Opt_errors_panic,
+};
+
+enum squashfs_param {
+	Opt_errors,
+};
+
+struct squashfs_mount_opts {
+	enum Opt_errors errors;
+};
+
+static const struct constant_table squashfs_param_errors[] = {
+	{"continue",   Opt_errors_continue },
+	{"panic",      Opt_errors_panic },
+	{}
+};
+
+static const struct fs_parameter_spec squashfs_fs_parameters[] = {
+	fsparam_enum("errors", Opt_errors, squashfs_param_errors),
+	{}
+};
+
+static int squashfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+	struct squashfs_mount_opts *opts = fc->fs_private;
+	struct fs_parse_result result;
+	int opt;
+
+	opt = fs_parse(fc, squashfs_fs_parameters, param, &result);
+	if (opt < 0)
+		return opt;
+
+	switch (opt) {
+	case Opt_errors:
+		opts->errors = result.uint_32;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static const struct squashfs_decompressor *supported_squashfs_filesystem(
 	struct fs_context *fc,
 	short major, short minor, short id)
@@ -67,6 +115,7 @@ static const struct squashfs_decompressor *supported_squashfs_filesystem(
 
 static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc)
 {
+	struct squashfs_mount_opts *opts = fc->fs_private;
 	struct squashfs_sb_info *msblk;
 	struct squashfs_super_block *sblk = NULL;
 	struct inode *root;
@@ -85,6 +134,8 @@ static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc)
 	}
 	msblk = sb->s_fs_info;
 
+	msblk->panic_on_errors = (opts->errors == Opt_errors_panic);
+
 	msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE);
 	msblk->devblksize_log2 = ffz(~msblk->devblksize);
 
@@ -129,8 +180,8 @@ static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc)
 	/* Check the filesystem does not extend beyond the end of the
 	   block device */
 	msblk->bytes_used = le64_to_cpu(sblk->bytes_used);
-	if (msblk->bytes_used < 0 || msblk->bytes_used >
-			i_size_read(sb->s_bdev->bd_inode))
+	if (msblk->bytes_used < 0 ||
+	    msblk->bytes_used > bdev_nr_bytes(sb->s_bdev))
 		goto failed_mount;
 
 	/* Check block size for sanity */
@@ -166,6 +217,7 @@ static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc)
 	msblk->directory_table = le64_to_cpu(sblk->directory_table_start);
 	msblk->inodes = le32_to_cpu(sblk->inodes);
 	msblk->fragments = le32_to_cpu(sblk->fragments);
+	msblk->ids = le16_to_cpu(sblk->no_ids);
 	flags = le16_to_cpu(sblk->flags);
 
 	TRACE("Found valid superblock on %pg\n", sb->s_bdev);
@@ -177,7 +229,7 @@ static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc)
 	TRACE("Block size %d\n", msblk->block_size);
 	TRACE("Number of inodes %d\n", msblk->inodes);
 	TRACE("Number of fragments %d\n", msblk->fragments);
-	TRACE("Number of ids %d\n", le16_to_cpu(sblk->no_ids));
+	TRACE("Number of ids %d\n", msblk->ids);
 	TRACE("sblk->inode_table_start %llx\n", msblk->inode_table);
 	TRACE("sblk->directory_table_start %llx\n", msblk->directory_table);
 	TRACE("sblk->fragment_table_start %llx\n",
@@ -236,8 +288,7 @@ static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc)
 allocate_id_index_table:
 	/* Allocate and read id index table */
 	msblk->id_table = squashfs_read_id_index_table(sb,
-		le64_to_cpu(sblk->id_table_start), next_table,
-		le16_to_cpu(sblk->no_ids));
+		le64_to_cpu(sblk->id_table_start), next_table, msblk->ids);
 	if (IS_ERR(msblk->id_table)) {
 		errorf(fc, "unable to read id index table");
 		err = PTR_ERR(msblk->id_table);
@@ -350,18 +401,52 @@ static int squashfs_get_tree(struct fs_context *fc)
 
 static int squashfs_reconfigure(struct fs_context *fc)
 {
+	struct super_block *sb = fc->root->d_sb;
+	struct squashfs_sb_info *msblk = sb->s_fs_info;
+	struct squashfs_mount_opts *opts = fc->fs_private;
+
 	sync_filesystem(fc->root->d_sb);
 	fc->sb_flags |= SB_RDONLY;
+
+	msblk->panic_on_errors = (opts->errors == Opt_errors_panic);
+
 	return 0;
 }
 
+static void squashfs_free_fs_context(struct fs_context *fc)
+{
+	kfree(fc->fs_private);
+}
+
 static const struct fs_context_operations squashfs_context_ops = {
 	.get_tree	= squashfs_get_tree,
+	.free		= squashfs_free_fs_context,
+	.parse_param	= squashfs_parse_param,
 	.reconfigure	= squashfs_reconfigure,
 };
 
+static int squashfs_show_options(struct seq_file *s, struct dentry *root)
+{
+	struct super_block *sb = root->d_sb;
+	struct squashfs_sb_info *msblk = sb->s_fs_info;
+
+	if (msblk->panic_on_errors)
+		seq_puts(s, ",errors=panic");
+	else
+		seq_puts(s, ",errors=continue");
+
+	return 0;
+}
+
 static int squashfs_init_fs_context(struct fs_context *fc)
 {
+	struct squashfs_mount_opts *opts;
+
+	opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+	if (!opts)
+		return -ENOMEM;
+
+	fc->fs_private = opts;
 	fc->ops = &squashfs_context_ops;
 	return 0;
 }
@@ -380,8 +465,7 @@ static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 	buf->f_files = msblk->inodes;
 	buf->f_ffree = 0;
 	buf->f_namelen = SQUASHFS_NAME_LEN;
-	buf->f_fsid.val[0] = (u32)id;
-	buf->f_fsid.val[1] = (u32)(id >> 32);
+	buf->f_fsid = u64_to_fsid(id);
 
 	return 0;
 }
@@ -467,7 +551,7 @@ static void __exit exit_squashfs_fs(void)
 static struct inode *squashfs_alloc_inode(struct super_block *sb)
 {
 	struct squashfs_inode_info *ei =
-		kmem_cache_alloc(squashfs_inode_cachep, GFP_KERNEL);
+		alloc_inode_sb(sb, squashfs_inode_cachep, GFP_KERNEL);
 
 	return ei ? &ei->vfs_inode : NULL;
 }
@@ -482,6 +566,7 @@ static struct file_system_type squashfs_fs_type = {
 	.owner = THIS_MODULE,
 	.name = "squashfs",
 	.init_fs_context = squashfs_init_fs_context,
+	.parameters = squashfs_fs_parameters,
 	.kill_sb = kill_block_super,
 	.fs_flags = FS_REQUIRES_DEV
 };
@@ -492,6 +577,7 @@ static const struct super_operations squashfs_super_ops = {
 	.free_inode = squashfs_free_inode,
 	.statfs = squashfs_statfs,
 	.put_super = squashfs_put_super,
+	.show_options = squashfs_show_options,
 };
 
 module_init(init_squashfs_fs);