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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /fs/affs/super.c | |
parent | Initial commit. (diff) | |
download | linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/affs/super.c')
-rw-r--r-- | fs/affs/super.c | 681 |
1 files changed, 681 insertions, 0 deletions
diff --git a/fs/affs/super.c b/fs/affs/super.c new file mode 100644 index 000000000..c6c2a513e --- /dev/null +++ b/fs/affs/super.c @@ -0,0 +1,681 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/fs/affs/inode.c + * + * (c) 1996 Hans-Joachim Widmaier - Rewritten + * + * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. + * + * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem. + * + * (C) 1991 Linus Torvalds - minix filesystem + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/statfs.h> +#include <linux/parser.h> +#include <linux/magic.h> +#include <linux/sched.h> +#include <linux/cred.h> +#include <linux/slab.h> +#include <linux/writeback.h> +#include <linux/blkdev.h> +#include <linux/seq_file.h> +#include <linux/iversion.h> +#include "affs.h" + +static int affs_statfs(struct dentry *dentry, struct kstatfs *buf); +static int affs_show_options(struct seq_file *m, struct dentry *root); +static int affs_remount (struct super_block *sb, int *flags, char *data); + +static void +affs_commit_super(struct super_block *sb, int wait) +{ + struct affs_sb_info *sbi = AFFS_SB(sb); + struct buffer_head *bh = sbi->s_root_bh; + struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh); + + lock_buffer(bh); + affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change); + affs_fix_checksum(sb, bh); + unlock_buffer(bh); + + mark_buffer_dirty(bh); + if (wait) + sync_dirty_buffer(bh); +} + +static void +affs_put_super(struct super_block *sb) +{ + struct affs_sb_info *sbi = AFFS_SB(sb); + pr_debug("%s()\n", __func__); + + cancel_delayed_work_sync(&sbi->sb_work); +} + +static int +affs_sync_fs(struct super_block *sb, int wait) +{ + affs_commit_super(sb, wait); + return 0; +} + +static void flush_superblock(struct work_struct *work) +{ + struct affs_sb_info *sbi; + struct super_block *sb; + + sbi = container_of(work, struct affs_sb_info, sb_work.work); + sb = sbi->sb; + + spin_lock(&sbi->work_lock); + sbi->work_queued = 0; + spin_unlock(&sbi->work_lock); + + affs_commit_super(sb, 1); +} + +void affs_mark_sb_dirty(struct super_block *sb) +{ + struct affs_sb_info *sbi = AFFS_SB(sb); + unsigned long delay; + + if (sb_rdonly(sb)) + return; + + spin_lock(&sbi->work_lock); + if (!sbi->work_queued) { + delay = msecs_to_jiffies(dirty_writeback_interval * 10); + queue_delayed_work(system_long_wq, &sbi->sb_work, delay); + sbi->work_queued = 1; + } + spin_unlock(&sbi->work_lock); +} + +static struct kmem_cache * affs_inode_cachep; + +static struct inode *affs_alloc_inode(struct super_block *sb) +{ + struct affs_inode_info *i; + + i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL); + if (!i) + return NULL; + + inode_set_iversion(&i->vfs_inode, 1); + i->i_lc = NULL; + i->i_ext_bh = NULL; + i->i_pa_cnt = 0; + + return &i->vfs_inode; +} + +static void affs_free_inode(struct inode *inode) +{ + kmem_cache_free(affs_inode_cachep, AFFS_I(inode)); +} + +static void init_once(void *foo) +{ + struct affs_inode_info *ei = (struct affs_inode_info *) foo; + + mutex_init(&ei->i_link_lock); + mutex_init(&ei->i_ext_lock); + inode_init_once(&ei->vfs_inode); +} + +static int __init init_inodecache(void) +{ + affs_inode_cachep = kmem_cache_create("affs_inode_cache", + sizeof(struct affs_inode_info), + 0, (SLAB_RECLAIM_ACCOUNT| + SLAB_MEM_SPREAD|SLAB_ACCOUNT), + init_once); + if (affs_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + +static void destroy_inodecache(void) +{ + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); + kmem_cache_destroy(affs_inode_cachep); +} + +static const struct super_operations affs_sops = { + .alloc_inode = affs_alloc_inode, + .free_inode = affs_free_inode, + .write_inode = affs_write_inode, + .evict_inode = affs_evict_inode, + .put_super = affs_put_super, + .sync_fs = affs_sync_fs, + .statfs = affs_statfs, + .remount_fs = affs_remount, + .show_options = affs_show_options, +}; + +enum { + Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect, + Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, + Opt_verbose, Opt_volume, Opt_ignore, Opt_err, +}; + +static const match_table_t tokens = { + {Opt_bs, "bs=%u"}, + {Opt_mode, "mode=%o"}, + {Opt_mufs, "mufs"}, + {Opt_notruncate, "nofilenametruncate"}, + {Opt_prefix, "prefix=%s"}, + {Opt_protect, "protect"}, + {Opt_reserved, "reserved=%u"}, + {Opt_root, "root=%u"}, + {Opt_setgid, "setgid=%u"}, + {Opt_setuid, "setuid=%u"}, + {Opt_verbose, "verbose"}, + {Opt_volume, "volume=%s"}, + {Opt_ignore, "grpquota"}, + {Opt_ignore, "noquota"}, + {Opt_ignore, "quota"}, + {Opt_ignore, "usrquota"}, + {Opt_err, NULL}, +}; + +static int +parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root, + int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) +{ + char *p; + substring_t args[MAX_OPT_ARGS]; + + /* Fill in defaults */ + + *uid = current_uid(); + *gid = current_gid(); + *reserved = 2; + *root = -1; + *blocksize = -1; + volume[0] = ':'; + volume[1] = 0; + *mount_opts = 0; + if (!options) + return 1; + + while ((p = strsep(&options, ",")) != NULL) { + int token, n, option; + if (!*p) + continue; + + token = match_token(p, tokens, args); + switch (token) { + case Opt_bs: + if (match_int(&args[0], &n)) + return 0; + if (n != 512 && n != 1024 && n != 2048 + && n != 4096) { + pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); + return 0; + } + *blocksize = n; + break; + case Opt_mode: + if (match_octal(&args[0], &option)) + return 0; + *mode = option & 0777; + affs_set_opt(*mount_opts, SF_SETMODE); + break; + case Opt_mufs: + affs_set_opt(*mount_opts, SF_MUFS); + break; + case Opt_notruncate: + affs_set_opt(*mount_opts, SF_NO_TRUNCATE); + break; + case Opt_prefix: + kfree(*prefix); + *prefix = match_strdup(&args[0]); + if (!*prefix) + return 0; + affs_set_opt(*mount_opts, SF_PREFIX); + break; + case Opt_protect: + affs_set_opt(*mount_opts, SF_IMMUTABLE); + break; + case Opt_reserved: + if (match_int(&args[0], reserved)) + return 0; + break; + case Opt_root: + if (match_int(&args[0], root)) + return 0; + break; + case Opt_setgid: + if (match_int(&args[0], &option)) + return 0; + *gid = make_kgid(current_user_ns(), option); + if (!gid_valid(*gid)) + return 0; + affs_set_opt(*mount_opts, SF_SETGID); + break; + case Opt_setuid: + if (match_int(&args[0], &option)) + return 0; + *uid = make_kuid(current_user_ns(), option); + if (!uid_valid(*uid)) + return 0; + affs_set_opt(*mount_opts, SF_SETUID); + break; + case Opt_verbose: + affs_set_opt(*mount_opts, SF_VERBOSE); + break; + case Opt_volume: { + char *vol = match_strdup(&args[0]); + if (!vol) + return 0; + strlcpy(volume, vol, 32); + kfree(vol); + break; + } + case Opt_ignore: + /* Silently ignore the quota options */ + break; + default: + pr_warn("Unrecognized mount option \"%s\" or missing value\n", + p); + return 0; + } + } + return 1; +} + +static int affs_show_options(struct seq_file *m, struct dentry *root) +{ + struct super_block *sb = root->d_sb; + struct affs_sb_info *sbi = AFFS_SB(sb); + + if (sb->s_blocksize) + seq_printf(m, ",bs=%lu", sb->s_blocksize); + if (affs_test_opt(sbi->s_flags, SF_SETMODE)) + seq_printf(m, ",mode=%o", sbi->s_mode); + if (affs_test_opt(sbi->s_flags, SF_MUFS)) + seq_puts(m, ",mufs"); + if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE)) + seq_puts(m, ",nofilenametruncate"); + if (affs_test_opt(sbi->s_flags, SF_PREFIX)) + seq_printf(m, ",prefix=%s", sbi->s_prefix); + if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE)) + seq_puts(m, ",protect"); + if (sbi->s_reserved != 2) + seq_printf(m, ",reserved=%u", sbi->s_reserved); + if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2) + seq_printf(m, ",root=%u", sbi->s_root_block); + if (affs_test_opt(sbi->s_flags, SF_SETGID)) + seq_printf(m, ",setgid=%u", + from_kgid_munged(&init_user_ns, sbi->s_gid)); + if (affs_test_opt(sbi->s_flags, SF_SETUID)) + seq_printf(m, ",setuid=%u", + from_kuid_munged(&init_user_ns, sbi->s_uid)); + if (affs_test_opt(sbi->s_flags, SF_VERBOSE)) + seq_puts(m, ",verbose"); + if (sbi->s_volume[0]) + seq_printf(m, ",volume=%s", sbi->s_volume); + return 0; +} + +/* This function definitely needs to be split up. Some fine day I'll + * hopefully have the guts to do so. Until then: sorry for the mess. + */ + +static int affs_fill_super(struct super_block *sb, void *data, int silent) +{ + struct affs_sb_info *sbi; + struct buffer_head *root_bh = NULL; + struct buffer_head *boot_bh; + struct inode *root_inode = NULL; + s32 root_block; + int size, blocksize; + u32 chksum; + int num_bm; + int i, j; + kuid_t uid; + kgid_t gid; + int reserved; + unsigned long mount_flags; + int tmp_flags; /* fix remount prototype... */ + u8 sig[4]; + int ret; + + pr_debug("read_super(%s)\n", data ? (const char *)data : "no options"); + + sb->s_magic = AFFS_SUPER_MAGIC; + sb->s_op = &affs_sops; + sb->s_flags |= SB_NODIRATIME; + + sb->s_time_gran = NSEC_PER_SEC; + sb->s_time_min = sys_tz.tz_minuteswest * 60 + AFFS_EPOCH_DELTA; + sb->s_time_max = 86400LL * U32_MAX + 86400 + sb->s_time_min; + + sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL); + if (!sbi) + return -ENOMEM; + + sb->s_fs_info = sbi; + sbi->sb = sb; + mutex_init(&sbi->s_bmlock); + spin_lock_init(&sbi->symlink_lock); + spin_lock_init(&sbi->work_lock); + INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock); + + if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, + &blocksize,&sbi->s_prefix, + sbi->s_volume, &mount_flags)) { + pr_err("Error parsing options\n"); + return -EINVAL; + } + /* N.B. after this point s_prefix must be released */ + + sbi->s_flags = mount_flags; + sbi->s_mode = i; + sbi->s_uid = uid; + sbi->s_gid = gid; + sbi->s_reserved= reserved; + + /* Get the size of the device in 512-byte blocks. + * If we later see that the partition uses bigger + * blocks, we will have to change it. + */ + + size = i_size_read(sb->s_bdev->bd_inode) >> 9; + pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size); + + affs_set_blocksize(sb, PAGE_SIZE); + /* Try to find root block. Its location depends on the block size. */ + + i = bdev_logical_block_size(sb->s_bdev); + j = PAGE_SIZE; + if (blocksize > 0) { + i = j = blocksize; + size = size / (blocksize / 512); + } + + for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) { + sbi->s_root_block = root_block; + if (root_block < 0) + sbi->s_root_block = (reserved + size - 1) / 2; + pr_debug("setting blocksize to %d\n", blocksize); + affs_set_blocksize(sb, blocksize); + sbi->s_partition_size = size; + + /* The root block location that was calculated above is not + * correct if the partition size is an odd number of 512- + * byte blocks, which will be rounded down to a number of + * 1024-byte blocks, and if there were an even number of + * reserved blocks. Ideally, all partition checkers should + * report the real number of blocks of the real blocksize, + * but since this just cannot be done, we have to try to + * find the root block anyways. In the above case, it is one + * block behind the calculated one. So we check this one, too. + */ + for (num_bm = 0; num_bm < 2; num_bm++) { + pr_debug("Dev %s, trying root=%u, bs=%d, " + "size=%d, reserved=%d\n", + sb->s_id, + sbi->s_root_block + num_bm, + blocksize, size, reserved); + root_bh = affs_bread(sb, sbi->s_root_block + num_bm); + if (!root_bh) + continue; + if (!affs_checksum_block(sb, root_bh) && + be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && + be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { + sbi->s_hashsize = blocksize / 4 - 56; + sbi->s_root_block += num_bm; + goto got_root; + } + affs_brelse(root_bh); + root_bh = NULL; + } + } + if (!silent) + pr_err("No valid root block on device %s\n", sb->s_id); + return -EINVAL; + + /* N.B. after this point bh must be released */ +got_root: + /* Keep super block in cache */ + sbi->s_root_bh = root_bh; + root_block = sbi->s_root_block; + + /* Find out which kind of FS we have */ + boot_bh = sb_bread(sb, 0); + if (!boot_bh) { + pr_err("Cannot read boot block\n"); + return -EINVAL; + } + memcpy(sig, boot_bh->b_data, 4); + brelse(boot_bh); + chksum = be32_to_cpu(*(__be32 *)sig); + + /* Dircache filesystems are compatible with non-dircache ones + * when reading. As long as they aren't supported, writing is + * not recommended. + */ + if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS + || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) { + pr_notice("Dircache FS - mounting %s read only\n", sb->s_id); + sb->s_flags |= SB_RDONLY; + } + switch (chksum) { + case MUFS_FS: + case MUFS_INTLFFS: + case MUFS_DCFFS: + affs_set_opt(sbi->s_flags, SF_MUFS); + fallthrough; + case FS_INTLFFS: + case FS_DCFFS: + affs_set_opt(sbi->s_flags, SF_INTL); + break; + case MUFS_FFS: + affs_set_opt(sbi->s_flags, SF_MUFS); + break; + case FS_FFS: + break; + case MUFS_OFS: + affs_set_opt(sbi->s_flags, SF_MUFS); + fallthrough; + case FS_OFS: + affs_set_opt(sbi->s_flags, SF_OFS); + sb->s_flags |= SB_NOEXEC; + break; + case MUFS_DCOFS: + case MUFS_INTLOFS: + affs_set_opt(sbi->s_flags, SF_MUFS); + fallthrough; + case FS_DCOFS: + case FS_INTLOFS: + affs_set_opt(sbi->s_flags, SF_INTL); + affs_set_opt(sbi->s_flags, SF_OFS); + sb->s_flags |= SB_NOEXEC; + break; + default: + pr_err("Unknown filesystem on device %s: %08X\n", + sb->s_id, chksum); + return -EINVAL; + } + + if (affs_test_opt(mount_flags, SF_VERBOSE)) { + u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; + pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n", + len > 31 ? 31 : len, + AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, + sig, sig[3] + '0', blocksize); + } + + sb->s_flags |= SB_NODEV | SB_NOSUID; + + sbi->s_data_blksize = sb->s_blocksize; + if (affs_test_opt(sbi->s_flags, SF_OFS)) + sbi->s_data_blksize -= 24; + + tmp_flags = sb->s_flags; + ret = affs_init_bitmap(sb, &tmp_flags); + if (ret) + return ret; + sb->s_flags = tmp_flags; + + /* set up enough so that it can read an inode */ + + root_inode = affs_iget(sb, root_block); + if (IS_ERR(root_inode)) + return PTR_ERR(root_inode); + + if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL)) + sb->s_d_op = &affs_intl_dentry_operations; + else + sb->s_d_op = &affs_dentry_operations; + + sb->s_root = d_make_root(root_inode); + if (!sb->s_root) { + pr_err("AFFS: Get root inode failed\n"); + return -ENOMEM; + } + + sb->s_export_op = &affs_export_ops; + pr_debug("s_flags=%lX\n", sb->s_flags); + return 0; +} + +static int +affs_remount(struct super_block *sb, int *flags, char *data) +{ + struct affs_sb_info *sbi = AFFS_SB(sb); + int blocksize; + kuid_t uid; + kgid_t gid; + int mode; + int reserved; + int root_block; + unsigned long mount_flags; + int res = 0; + char volume[32]; + char *prefix = NULL; + + pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data); + + sync_filesystem(sb); + *flags |= SB_NODIRATIME; + + memcpy(volume, sbi->s_volume, 32); + if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block, + &blocksize, &prefix, volume, + &mount_flags)) { + kfree(prefix); + return -EINVAL; + } + + flush_delayed_work(&sbi->sb_work); + + sbi->s_flags = mount_flags; + sbi->s_mode = mode; + sbi->s_uid = uid; + sbi->s_gid = gid; + /* protect against readers */ + spin_lock(&sbi->symlink_lock); + if (prefix) { + kfree(sbi->s_prefix); + sbi->s_prefix = prefix; + } + memcpy(sbi->s_volume, volume, 32); + spin_unlock(&sbi->symlink_lock); + + if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) + return 0; + + if (*flags & SB_RDONLY) + affs_free_bitmap(sb); + else + res = affs_init_bitmap(sb, flags); + + return res; +} + +static int +affs_statfs(struct dentry *dentry, struct kstatfs *buf) +{ + struct super_block *sb = dentry->d_sb; + int free; + u64 id = huge_encode_dev(sb->s_bdev->bd_dev); + + pr_debug("%s() partsize=%d, reserved=%d\n", + __func__, AFFS_SB(sb)->s_partition_size, + AFFS_SB(sb)->s_reserved); + + free = affs_count_free_blocks(sb); + buf->f_type = AFFS_SUPER_MAGIC; + buf->f_bsize = sb->s_blocksize; + buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; + buf->f_bfree = free; + buf->f_bavail = free; + buf->f_fsid = u64_to_fsid(id); + buf->f_namelen = AFFSNAMEMAX; + return 0; +} + +static struct dentry *affs_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super); +} + +static void affs_kill_sb(struct super_block *sb) +{ + struct affs_sb_info *sbi = AFFS_SB(sb); + kill_block_super(sb); + if (sbi) { + affs_free_bitmap(sb); + affs_brelse(sbi->s_root_bh); + kfree(sbi->s_prefix); + mutex_destroy(&sbi->s_bmlock); + kfree(sbi); + } +} + +static struct file_system_type affs_fs_type = { + .owner = THIS_MODULE, + .name = "affs", + .mount = affs_mount, + .kill_sb = affs_kill_sb, + .fs_flags = FS_REQUIRES_DEV, +}; +MODULE_ALIAS_FS("affs"); + +static int __init init_affs_fs(void) +{ + int err = init_inodecache(); + if (err) + goto out1; + err = register_filesystem(&affs_fs_type); + if (err) + goto out; + return 0; +out: + destroy_inodecache(); +out1: + return err; +} + +static void __exit exit_affs_fs(void) +{ + unregister_filesystem(&affs_fs_type); + destroy_inodecache(); +} + +MODULE_DESCRIPTION("Amiga filesystem support for Linux"); +MODULE_LICENSE("GPL"); + +module_init(init_affs_fs) +module_exit(exit_affs_fs) |