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authorLinus Torvalds <torvalds@linux-foundation.org>2019-09-19 20:06:57 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-09-19 20:06:57 +0300
commitbc7d9aee3f3ce0c0633c20ea55b81efb3ca7984d (patch)
tree24e17a197a1b84d3576a69cd8955fbf8b8a9dc76 /fs/squashfs/super.c
parentcfb82e1df8b7c76991ea12958855897c2fb4debc (diff)
parent74983ac20aeafc88d9ceed64a8bf2a9024c488d5 (diff)
downloadlinux-bc7d9aee3f3ce0c0633c20ea55b81efb3ca7984d.tar.xz
Merge branch 'work.mount2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull misc mount API conversions from Al Viro: "Conversions to new API for shmem and friends and for mount_mtd()-using filesystems. As for the rest of the mount API conversions in -next, some of them belong in the individual trees (e.g. binderfs one should definitely go through android folks, after getting redone on top of their changes). I'm going to drop those and send the rest (trivial ones + stuff ACKed by maintainers) in a separate series - by that point they are independent from each other. Some stuff has already migrated into individual trees (NFS conversion, for example, or FUSE stuff, etc.); those presumably will go through the regular merges from corresponding trees." * 'work.mount2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: vfs: Make fs_parse() handle fs_param_is_fd-type params better vfs: Convert ramfs, shmem, tmpfs, devtmpfs, rootfs to use the new mount API shmem_parse_one(): switch to use of fs_parse() shmem_parse_options(): take handling a single option into a helper shmem_parse_options(): don't bother with mpol in separate variable shmem_parse_options(): use a separate structure to keep the results make shmem_fill_super() static make ramfs_fill_super() static devtmpfs: don't mix {ramfs,shmem}_fill_super() with mount_single() vfs: Convert squashfs to use the new mount API mtd: Kill mount_mtd() vfs: Convert jffs2 to use the new mount API vfs: Convert cramfs to use the new mount API vfs: Convert romfs to use the new mount API vfs: Add a single-or-reconfig keying to vfs_get_super()
Diffstat (limited to 'fs/squashfs/super.c')
-rw-r--r--fs/squashfs/super.c100
1 files changed, 55 insertions, 45 deletions
diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index a9e9837617a9..0cc4ceec0562 100644
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -17,6 +17,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/fs.h>
+#include <linux/fs_context.h>
#include <linux/vfs.h>
#include <linux/slab.h>
#include <linux/mutex.h>
@@ -36,26 +37,27 @@
static struct file_system_type squashfs_fs_type;
static const struct super_operations squashfs_super_ops;
-static const struct squashfs_decompressor *supported_squashfs_filesystem(short
- major, short minor, short id)
+static const struct squashfs_decompressor *supported_squashfs_filesystem(
+ struct fs_context *fc,
+ short major, short minor, short id)
{
const struct squashfs_decompressor *decompressor;
if (major < SQUASHFS_MAJOR) {
- ERROR("Major/Minor mismatch, older Squashfs %d.%d "
- "filesystems are unsupported\n", major, minor);
+ errorf(fc, "Major/Minor mismatch, older Squashfs %d.%d "
+ "filesystems are unsupported", major, minor);
return NULL;
} else if (major > SQUASHFS_MAJOR || minor > SQUASHFS_MINOR) {
- ERROR("Major/Minor mismatch, trying to mount newer "
- "%d.%d filesystem\n", major, minor);
- ERROR("Please update your kernel\n");
+ errorf(fc, "Major/Minor mismatch, trying to mount newer "
+ "%d.%d filesystem", major, minor);
+ errorf(fc, "Please update your kernel");
return NULL;
}
decompressor = squashfs_lookup_decompressor(id);
if (!decompressor->supported) {
- ERROR("Filesystem uses \"%s\" compression. This is not "
- "supported\n", decompressor->name);
+ errorf(fc, "Filesystem uses \"%s\" compression. This is not supported",
+ decompressor->name);
return NULL;
}
@@ -63,7 +65,7 @@ static const struct squashfs_decompressor *supported_squashfs_filesystem(short
}
-static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
+static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct squashfs_sb_info *msblk;
struct squashfs_super_block *sblk = NULL;
@@ -98,7 +100,7 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
sblk = squashfs_read_table(sb, SQUASHFS_START, sizeof(*sblk));
if (IS_ERR(sblk)) {
- ERROR("unable to read squashfs_super_block\n");
+ errorf(fc, "unable to read squashfs_super_block");
err = PTR_ERR(sblk);
sblk = NULL;
goto failed_mount;
@@ -109,14 +111,15 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
/* Check it is a SQUASHFS superblock */
sb->s_magic = le32_to_cpu(sblk->s_magic);
if (sb->s_magic != SQUASHFS_MAGIC) {
- if (!silent)
- ERROR("Can't find a SQUASHFS superblock on %pg\n",
- sb->s_bdev);
+ if (!(fc->sb_flags & SB_SILENT))
+ errorf(fc, "Can't find a SQUASHFS superblock on %pg",
+ sb->s_bdev);
goto failed_mount;
}
/* Check the MAJOR & MINOR versions and lookup compression type */
msblk->decompressor = supported_squashfs_filesystem(
+ fc,
le16_to_cpu(sblk->s_major),
le16_to_cpu(sblk->s_minor),
le16_to_cpu(sblk->compression));
@@ -133,15 +136,15 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
/* Check block size for sanity */
msblk->block_size = le32_to_cpu(sblk->block_size);
if (msblk->block_size > SQUASHFS_FILE_MAX_SIZE)
- goto failed_mount;
+ goto insanity;
/*
* Check the system page size is not larger than the filesystem
* block size (by default 128K). This is currently not supported.
*/
if (PAGE_SIZE > msblk->block_size) {
- ERROR("Page size > filesystem block size (%d). This is "
- "currently not supported!\n", msblk->block_size);
+ errorf(fc, "Page size > filesystem block size (%d). This is "
+ "currently not supported!", msblk->block_size);
goto failed_mount;
}
@@ -152,12 +155,12 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
/* Check that block_size and block_log match */
if (msblk->block_size != (1 << msblk->block_log))
- goto failed_mount;
+ goto insanity;
/* Check the root inode for sanity */
root_inode = le64_to_cpu(sblk->root_inode);
if (SQUASHFS_INODE_OFFSET(root_inode) > SQUASHFS_METADATA_SIZE)
- goto failed_mount;
+ goto insanity;
msblk->inode_table = le64_to_cpu(sblk->inode_table_start);
msblk->directory_table = le64_to_cpu(sblk->directory_table_start);
@@ -199,7 +202,7 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
msblk->read_page = squashfs_cache_init("data",
squashfs_max_decompressors(), msblk->block_size);
if (msblk->read_page == NULL) {
- ERROR("Failed to allocate read_page block\n");
+ errorf(fc, "Failed to allocate read_page block");
goto failed_mount;
}
@@ -207,7 +210,7 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
if (IS_ERR(msblk->stream)) {
err = PTR_ERR(msblk->stream);
msblk->stream = NULL;
- goto failed_mount;
+ goto insanity;
}
/* Handle xattrs */
@@ -222,7 +225,7 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
msblk->xattr_id_table = squashfs_read_xattr_id_table(sb,
xattr_id_table_start, &msblk->xattr_table, &msblk->xattr_ids);
if (IS_ERR(msblk->xattr_id_table)) {
- ERROR("unable to read xattr id index table\n");
+ errorf(fc, "unable to read xattr id index table");
err = PTR_ERR(msblk->xattr_id_table);
msblk->xattr_id_table = NULL;
if (err != -ENOTSUPP)
@@ -236,7 +239,7 @@ allocate_id_index_table:
le64_to_cpu(sblk->id_table_start), next_table,
le16_to_cpu(sblk->no_ids));
if (IS_ERR(msblk->id_table)) {
- ERROR("unable to read id index table\n");
+ errorf(fc, "unable to read id index table");
err = PTR_ERR(msblk->id_table);
msblk->id_table = NULL;
goto failed_mount;
@@ -252,7 +255,7 @@ allocate_id_index_table:
msblk->inode_lookup_table = squashfs_read_inode_lookup_table(sb,
lookup_table_start, next_table, msblk->inodes);
if (IS_ERR(msblk->inode_lookup_table)) {
- ERROR("unable to read inode lookup table\n");
+ errorf(fc, "unable to read inode lookup table");
err = PTR_ERR(msblk->inode_lookup_table);
msblk->inode_lookup_table = NULL;
goto failed_mount;
@@ -277,7 +280,7 @@ handle_fragments:
msblk->fragment_index = squashfs_read_fragment_index_table(sb,
le64_to_cpu(sblk->fragment_table_start), next_table, fragments);
if (IS_ERR(msblk->fragment_index)) {
- ERROR("unable to read fragment index table\n");
+ errorf(fc, "unable to read fragment index table");
err = PTR_ERR(msblk->fragment_index);
msblk->fragment_index = NULL;
goto failed_mount;
@@ -288,13 +291,13 @@ check_directory_table:
/* Sanity check directory_table */
if (msblk->directory_table > next_table) {
err = -EINVAL;
- goto failed_mount;
+ goto insanity;
}
/* Sanity check inode_table */
if (msblk->inode_table >= msblk->directory_table) {
err = -EINVAL;
- goto failed_mount;
+ goto insanity;
}
/* allocate root */
@@ -323,6 +326,8 @@ check_directory_table:
kfree(sblk);
return 0;
+insanity:
+ errorf(fc, "squashfs image failed sanity check");
failed_mount:
squashfs_cache_delete(msblk->block_cache);
squashfs_cache_delete(msblk->fragment_cache);
@@ -338,6 +343,28 @@ failed_mount:
return err;
}
+static int squashfs_get_tree(struct fs_context *fc)
+{
+ return get_tree_bdev(fc, squashfs_fill_super);
+}
+
+static int squashfs_reconfigure(struct fs_context *fc)
+{
+ sync_filesystem(fc->root->d_sb);
+ fc->sb_flags |= SB_RDONLY;
+ return 0;
+}
+
+static const struct fs_context_operations squashfs_context_ops = {
+ .get_tree = squashfs_get_tree,
+ .reconfigure = squashfs_reconfigure,
+};
+
+static int squashfs_init_fs_context(struct fs_context *fc)
+{
+ fc->ops = &squashfs_context_ops;
+ return 0;
+}
static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
@@ -360,14 +387,6 @@ static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf)
}
-static int squashfs_remount(struct super_block *sb, int *flags, char *data)
-{
- sync_filesystem(sb);
- *flags |= SB_RDONLY;
- return 0;
-}
-
-
static void squashfs_put_super(struct super_block *sb)
{
if (sb->s_fs_info) {
@@ -386,14 +405,6 @@ static void squashfs_put_super(struct super_block *sb)
}
}
-
-static struct dentry *squashfs_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
-{
- return mount_bdev(fs_type, flags, dev_name, data, squashfs_fill_super);
-}
-
-
static struct kmem_cache *squashfs_inode_cachep;
@@ -470,7 +481,7 @@ static void squashfs_free_inode(struct inode *inode)
static struct file_system_type squashfs_fs_type = {
.owner = THIS_MODULE,
.name = "squashfs",
- .mount = squashfs_mount,
+ .init_fs_context = squashfs_init_fs_context,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV
};
@@ -481,7 +492,6 @@ static const struct super_operations squashfs_super_ops = {
.free_inode = squashfs_free_inode,
.statfs = squashfs_statfs,
.put_super = squashfs_put_super,
- .remount_fs = squashfs_remount
};
module_init(init_squashfs_fs);