From 74f78fc5ef43d2bb676f212ffa4ad693dffc4141 Mon Sep 17 00:00:00 2001 From: David Howells Date: Mon, 25 Mar 2019 16:38:32 +0000 Subject: [PATCH] vfs: Convert cramfs to use the new mount API Convert the cramfs filesystem to the new internal mount API as the old one will be obsoleted and removed. This allows greater flexibility in communication of mount parameters between userspace, the VFS and the filesystem. See Documentation/filesystems/mount_api.txt for more information. Signed-off-by: David Howells Tested-by: Nicolas Pitre Acked-by: Nicolas Pitre cc: linux-mtd@lists.infradead.org cc: linux-block@vger.kernel.org Signed-off-by: Al Viro --- fs/cramfs/inode.c | 69 ++++++++++++++++++++++++++--------------------- 1 file changed, 39 insertions(+), 30 deletions(-) diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c index 9352487bd0fc..e1cf433ac982 100644 --- a/fs/cramfs/inode.c +++ b/fs/cramfs/inode.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include #include @@ -506,18 +507,19 @@ static void cramfs_kill_sb(struct super_block *sb) kfree(sbi); } -static int cramfs_remount(struct super_block *sb, int *flags, char *data) +static int cramfs_reconfigure(struct fs_context *fc) { - sync_filesystem(sb); - *flags |= SB_RDONLY; + sync_filesystem(fc->root->d_sb); + fc->sb_flags |= SB_RDONLY; return 0; } -static int cramfs_read_super(struct super_block *sb, - struct cramfs_super *super, int silent) +static int cramfs_read_super(struct super_block *sb, struct fs_context *fc, + struct cramfs_super *super) { struct cramfs_sb_info *sbi = CRAMFS_SB(sb); unsigned long root_offset; + bool silent = fc->sb_flags & SB_SILENT; /* We don't know the real size yet */ sbi->size = PAGE_SIZE; @@ -532,7 +534,7 @@ static int cramfs_read_super(struct super_block *sb, /* check for wrong endianness */ if (super->magic == CRAMFS_MAGIC_WEND) { if (!silent) - pr_err("wrong endianness\n"); + errorf(fc, "cramfs: wrong endianness"); return -EINVAL; } @@ -544,22 +546,22 @@ static int cramfs_read_super(struct super_block *sb, mutex_unlock(&read_mutex); if (super->magic != CRAMFS_MAGIC) { if (super->magic == CRAMFS_MAGIC_WEND && !silent) - pr_err("wrong endianness\n"); + errorf(fc, "cramfs: wrong endianness"); else if (!silent) - pr_err("wrong magic\n"); + errorf(fc, "cramfs: wrong magic"); return -EINVAL; } } /* get feature flags first */ if (super->flags & ~CRAMFS_SUPPORTED_FLAGS) { - pr_err("unsupported filesystem features\n"); + errorf(fc, "cramfs: unsupported filesystem features"); return -EINVAL; } /* Check that the root inode is in a sane state */ if (!S_ISDIR(super->root.mode)) { - pr_err("root is not a directory\n"); + errorf(fc, "cramfs: root is not a directory"); return -EINVAL; } /* correct strange, hard-coded permissions of mkcramfs */ @@ -578,12 +580,12 @@ static int cramfs_read_super(struct super_block *sb, sbi->magic = super->magic; sbi->flags = super->flags; if (root_offset == 0) - pr_info("empty filesystem"); + infof(fc, "cramfs: empty filesystem"); else if (!(super->flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) && ((root_offset != sizeof(struct cramfs_super)) && (root_offset != 512 + sizeof(struct cramfs_super)))) { - pr_err("bad root offset %lu\n", root_offset); + errorf(fc, "cramfs: bad root offset %lu", root_offset); return -EINVAL; } @@ -607,8 +609,7 @@ static int cramfs_finalize_super(struct super_block *sb, return 0; } -static int cramfs_blkdev_fill_super(struct super_block *sb, void *data, - int silent) +static int cramfs_blkdev_fill_super(struct super_block *sb, struct fs_context *fc) { struct cramfs_sb_info *sbi; struct cramfs_super super; @@ -623,14 +624,13 @@ static int cramfs_blkdev_fill_super(struct super_block *sb, void *data, for (i = 0; i < READ_BUFFERS; i++) buffer_blocknr[i] = -1; - err = cramfs_read_super(sb, &super, silent); + err = cramfs_read_super(sb, fc, &super); if (err) return err; return cramfs_finalize_super(sb, &super.root); } -static int cramfs_mtd_fill_super(struct super_block *sb, void *data, - int silent) +static int cramfs_mtd_fill_super(struct super_block *sb, struct fs_context *fc) { struct cramfs_sb_info *sbi; struct cramfs_super super; @@ -652,7 +652,7 @@ static int cramfs_mtd_fill_super(struct super_block *sb, void *data, pr_info("checking physical address %pap for linear cramfs image\n", &sbi->linear_phys_addr); - err = cramfs_read_super(sb, &super, silent); + err = cramfs_read_super(sb, fc, &super); if (err) return err; @@ -947,32 +947,41 @@ static const struct inode_operations cramfs_dir_inode_operations = { }; static const struct super_operations cramfs_ops = { - .remount_fs = cramfs_remount, .statfs = cramfs_statfs, }; -static struct dentry *cramfs_mount(struct file_system_type *fs_type, int flags, - const char *dev_name, void *data) +static int cramfs_get_tree(struct fs_context *fc) { - struct dentry *ret = ERR_PTR(-ENOPROTOOPT); + int ret = -ENOPROTOOPT; if (IS_ENABLED(CONFIG_CRAMFS_MTD)) { - ret = mount_mtd(fs_type, flags, dev_name, data, - cramfs_mtd_fill_super); - if (!IS_ERR(ret)) + ret = get_tree_mtd(fc, cramfs_mtd_fill_super); + if (ret < 0) return ret; } - if (IS_ENABLED(CONFIG_CRAMFS_BLOCKDEV)) { - ret = mount_bdev(fs_type, flags, dev_name, data, - cramfs_blkdev_fill_super); - } + if (IS_ENABLED(CONFIG_CRAMFS_BLOCKDEV)) + ret = get_tree_bdev(fc, cramfs_blkdev_fill_super); return ret; } +static const struct fs_context_operations cramfs_context_ops = { + .get_tree = cramfs_get_tree, + .reconfigure = cramfs_reconfigure, +}; + +/* + * Set up the filesystem mount context. + */ +static int cramfs_init_fs_context(struct fs_context *fc) +{ + fc->ops = &cramfs_context_ops; + return 0; +} + static struct file_system_type cramfs_fs_type = { .owner = THIS_MODULE, .name = "cramfs", - .mount = cramfs_mount, + .init_fs_context = cramfs_init_fs_context, .kill_sb = cramfs_kill_sb, .fs_flags = FS_REQUIRES_DEV, };