ext4: make mount option parsing loop more logical
The loop looking for correct mount option entry is more logical if it is written rewritten as an empty loop looking for correct option entry and then code handling the option. It also saves one level of indentation for a lot of code so we can join a couple of split lines. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>hifive-unleashed-5.1
Jan Kara
Theodore Ts'o
parent
0efb3b2300
commit
5f3633e36b
248
fs/ext4/super.c
248
fs/ext4/super.c
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@ -1508,8 +1508,7 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
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case Opt_sb:
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return 1; /* handled by get_sb_block() */
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case Opt_removed:
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ext4_msg(sb, KERN_WARNING,
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"Ignoring removed %s option", opt);
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ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
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return 1;
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case Opt_abort:
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sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
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@ -1519,132 +1518,129 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
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return 1;
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}
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for (m = ext4_mount_opts; m->token != Opt_err; m++) {
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if (token != m->token)
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continue;
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if (args->from && match_int(args, &arg))
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return -1;
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if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
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return -1;
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if (m->flags & MOPT_EXPLICIT)
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set_opt2(sb, EXPLICIT_DELALLOC);
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if (m->flags & MOPT_CLEAR_ERR)
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clear_opt(sb, ERRORS_MASK);
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if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
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ext4_msg(sb, KERN_ERR, "Cannot change quota "
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"options when quota turned on");
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return -1;
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}
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for (m = ext4_mount_opts; m->token != Opt_err; m++)
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if (token == m->token)
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break;
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if (m->flags & MOPT_NOSUPPORT) {
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ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
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} else if (token == Opt_commit) {
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if (arg == 0)
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arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
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sbi->s_commit_interval = HZ * arg;
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} else if (token == Opt_max_batch_time) {
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if (arg == 0)
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arg = EXT4_DEF_MAX_BATCH_TIME;
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sbi->s_max_batch_time = arg;
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} else if (token == Opt_min_batch_time) {
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sbi->s_min_batch_time = arg;
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} else if (token == Opt_inode_readahead_blks) {
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if (arg > (1 << 30))
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return -1;
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if (arg && !is_power_of_2(arg)) {
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ext4_msg(sb, KERN_ERR,
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"EXT4-fs: inode_readahead_blks"
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" must be a power of 2");
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return -1;
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}
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sbi->s_inode_readahead_blks = arg;
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} else if (token == Opt_init_itable) {
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set_opt(sb, INIT_INODE_TABLE);
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if (!args->from)
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arg = EXT4_DEF_LI_WAIT_MULT;
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sbi->s_li_wait_mult = arg;
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} else if (token == Opt_max_dir_size_kb) {
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sbi->s_max_dir_size_kb = arg;
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} else if (token == Opt_stripe) {
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sbi->s_stripe = arg;
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} else if (token == Opt_resuid) {
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uid = make_kuid(current_user_ns(), arg);
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if (!uid_valid(uid)) {
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ext4_msg(sb, KERN_ERR,
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"Invalid uid value %d", arg);
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return -1;
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}
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sbi->s_resuid = uid;
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} else if (token == Opt_resgid) {
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gid = make_kgid(current_user_ns(), arg);
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if (!gid_valid(gid)) {
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ext4_msg(sb, KERN_ERR,
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"Invalid gid value %d", arg);
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return -1;
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}
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sbi->s_resgid = gid;
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} else if (token == Opt_journal_dev) {
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if (is_remount) {
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ext4_msg(sb, KERN_ERR,
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"Cannot specify journal on remount");
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return -1;
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}
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*journal_devnum = arg;
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} else if (token == Opt_journal_ioprio) {
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if (arg > 7) {
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ext4_msg(sb, KERN_ERR,
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"Invalid journal IO priority"
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" (must be 0-7)");
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return -1;
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}
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*journal_ioprio =
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IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
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} else if (m->flags & MOPT_DATAJ) {
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if (is_remount) {
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if (!sbi->s_journal)
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ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
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else if (test_opt(sb, DATA_FLAGS) !=
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m->mount_opt) {
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ext4_msg(sb, KERN_ERR,
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"Cannot change data mode on remount");
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return -1;
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}
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} else {
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clear_opt(sb, DATA_FLAGS);
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sbi->s_mount_opt |= m->mount_opt;
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}
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#ifdef CONFIG_QUOTA
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} else if (m->flags & MOPT_QFMT) {
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if (sb_any_quota_loaded(sb) &&
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sbi->s_jquota_fmt != m->mount_opt) {
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ext4_msg(sb, KERN_ERR, "Cannot "
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"change journaled quota options "
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"when quota turned on");
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return -1;
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}
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sbi->s_jquota_fmt = m->mount_opt;
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#endif
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} else {
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if (!args->from)
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arg = 1;
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if (m->flags & MOPT_CLEAR)
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arg = !arg;
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else if (unlikely(!(m->flags & MOPT_SET))) {
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ext4_msg(sb, KERN_WARNING,
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"buggy handling of option %s", opt);
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WARN_ON(1);
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return -1;
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}
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if (arg != 0)
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sbi->s_mount_opt |= m->mount_opt;
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else
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sbi->s_mount_opt &= ~m->mount_opt;
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}
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return 1;
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if (m->token == Opt_err) {
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ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
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"or missing value", opt);
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return -1;
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}
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ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
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"or missing value", opt);
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return -1;
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if (args->from && match_int(args, &arg))
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return -1;
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if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
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return -1;
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if (m->flags & MOPT_EXPLICIT)
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set_opt2(sb, EXPLICIT_DELALLOC);
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if (m->flags & MOPT_CLEAR_ERR)
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clear_opt(sb, ERRORS_MASK);
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if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
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ext4_msg(sb, KERN_ERR, "Cannot change quota "
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"options when quota turned on");
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return -1;
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}
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if (m->flags & MOPT_NOSUPPORT) {
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ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
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} else if (token == Opt_commit) {
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if (arg == 0)
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arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
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sbi->s_commit_interval = HZ * arg;
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} else if (token == Opt_max_batch_time) {
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if (arg == 0)
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arg = EXT4_DEF_MAX_BATCH_TIME;
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sbi->s_max_batch_time = arg;
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} else if (token == Opt_min_batch_time) {
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sbi->s_min_batch_time = arg;
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} else if (token == Opt_inode_readahead_blks) {
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if (arg > (1 << 30))
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return -1;
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if (arg && !is_power_of_2(arg)) {
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ext4_msg(sb, KERN_ERR, "EXT4-fs: inode_readahead_blks"
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" must be a power of 2");
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return -1;
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}
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sbi->s_inode_readahead_blks = arg;
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} else if (token == Opt_init_itable) {
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set_opt(sb, INIT_INODE_TABLE);
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if (!args->from)
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arg = EXT4_DEF_LI_WAIT_MULT;
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sbi->s_li_wait_mult = arg;
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} else if (token == Opt_max_dir_size_kb) {
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sbi->s_max_dir_size_kb = arg;
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} else if (token == Opt_stripe) {
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sbi->s_stripe = arg;
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} else if (token == Opt_resuid) {
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uid = make_kuid(current_user_ns(), arg);
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if (!uid_valid(uid)) {
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ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
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return -1;
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}
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sbi->s_resuid = uid;
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} else if (token == Opt_resgid) {
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gid = make_kgid(current_user_ns(), arg);
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if (!gid_valid(gid)) {
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ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
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return -1;
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}
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sbi->s_resgid = gid;
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} else if (token == Opt_journal_dev) {
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if (is_remount) {
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ext4_msg(sb, KERN_ERR,
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"Cannot specify journal on remount");
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return -1;
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}
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*journal_devnum = arg;
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} else if (token == Opt_journal_ioprio) {
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if (arg > 7) {
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ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
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" (must be 0-7)");
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return -1;
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}
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*journal_ioprio =
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IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
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} else if (m->flags & MOPT_DATAJ) {
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if (is_remount) {
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if (!sbi->s_journal)
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ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
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else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
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ext4_msg(sb, KERN_ERR,
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"Cannot change data mode on remount");
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return -1;
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}
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} else {
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clear_opt(sb, DATA_FLAGS);
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sbi->s_mount_opt |= m->mount_opt;
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}
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#ifdef CONFIG_QUOTA
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} else if (m->flags & MOPT_QFMT) {
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if (sb_any_quota_loaded(sb) &&
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sbi->s_jquota_fmt != m->mount_opt) {
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ext4_msg(sb, KERN_ERR, "Cannot change journaled "
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"quota options when quota turned on");
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return -1;
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}
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sbi->s_jquota_fmt = m->mount_opt;
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#endif
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} else {
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if (!args->from)
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arg = 1;
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if (m->flags & MOPT_CLEAR)
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arg = !arg;
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else if (unlikely(!(m->flags & MOPT_SET))) {
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ext4_msg(sb, KERN_WARNING,
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"buggy handling of option %s", opt);
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WARN_ON(1);
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return -1;
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}
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if (arg != 0)
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sbi->s_mount_opt |= m->mount_opt;
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else
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sbi->s_mount_opt &= ~m->mount_opt;
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}
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return 1;
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}
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static int parse_options(char *options, struct super_block *sb,
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