By using a table-drive approach, we shave about 100 lines of code from
ext4, and make the code a bit more regular and factored out. This
will also make it possible in a future patch to use this table for
displaying the mount options that were specified in /proc/mounts.
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
---
fs/ext4/super.c | 570 +++++++++++++++++++++++--------------------------------
1 files changed, 234 insertions(+), 336 deletions(-)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index b5f2e68..61a65ee 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1509,371 +1509,269 @@ static int clear_qf_name(struct super_block *sb, int qtype)
}
#endif
-static int parse_options(char *options, struct super_block *sb,
- unsigned long *journal_devnum,
- unsigned int *journal_ioprio,
- int is_remount)
-{
- struct ext4_sb_info *sbi = EXT4_SB(sb);
- char *p;
- substring_t args[MAX_OPT_ARGS];
- int data_opt = 0;
- int option;
+#define MOPT_SET 0x0001
+#define MOPT_CLEAR 0x0002
+#define MOPT_NOSUPPORT 0x0004
+#define MOPT_EXPLICIT 0x0008
+#define MOPT_CLEAR_ERR 0x0010
+#define MOPT_GTE0 0x0020
#ifdef CONFIG_QUOTA
- int qfmt;
+#define MOPT_Q 0
+#define MOPT_QFMT 0x0040
+#else
+#define MOPT_Q MOPT_NOSUPPORT
+#define MOPT_QFMT MOPT_NOSUPPORT
#endif
-
- if (!options)
- return 1;
-
- while ((p = strsep(&options, ",")) != NULL) {
- int token;
- if (!*p)
- continue;
-
- /*
- * Initialize args struct so we know whether arg was
- * found; some options take optional arguments.
- */
- args[0].to = args[0].from = NULL;
- token = match_token(p, tokens, args);
- switch (token) {
- case Opt_bsd_df:
- clear_opt(sb, MINIX_DF);
- break;
- case Opt_minix_df:
- set_opt(sb, MINIX_DF);
- break;
- case Opt_grpid:
- set_opt(sb, GRPID);
- break;
- case Opt_nogrpid:
- clear_opt(sb, GRPID);
- break;
- case Opt_resuid:
- if (match_int(&args[0], &option))
- return 0;
- sbi->s_resuid = option;
- break;
- case Opt_resgid:
- if (match_int(&args[0], &option))
- return 0;
- sbi->s_resgid = option;
- break;
- case Opt_sb:
- /* handled by get_sb_block() instead of here */
- /* *sb_block = match_int(&args[0]); */
- break;
- case Opt_err_panic:
- clear_opt(sb, ERRORS_MASK);
- set_opt(sb, ERRORS_PANIC);
- break;
- case Opt_err_ro:
- clear_opt(sb, ERRORS_MASK);
- set_opt(sb, ERRORS_RO);
- break;
- case Opt_err_cont:
- clear_opt(sb, ERRORS_MASK);
- set_opt(sb, ERRORS_CONT);
- break;
- case Opt_nouid32:
- set_opt(sb, NO_UID32);
- break;
- case Opt_debug:
- set_opt(sb, DEBUG);
- break;
- case Opt_removed:
- ext4_msg(sb, KERN_WARNING,
- "Ignoring deprecated %s option", p);
- break;
+#define MOPT_DATAJ 0x0080
+
+static const struct mount_opts {
+ int token;
+ int mount_opt;
+ int flags;
+} ext4_mount_opts[] = {
+ {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
+ {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
+ {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
+ {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
+ {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
+ {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
+ {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
+ {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
+ {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
+ {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
+ {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
+ {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
+ {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
+ {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
+ {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
+ {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
+ EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
+ {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
+ {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
+ {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
+ {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
+ {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
+ {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
+ {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
+ {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
+ {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
+ {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
+ {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
+ {Opt_commit, 0, MOPT_GTE0},
+ {Opt_max_batch_time, 0, MOPT_GTE0},
+ {Opt_min_batch_time, 0, MOPT_GTE0},
+ {Opt_inode_readahead_blks, 0, MOPT_GTE0},
+ {Opt_init_itable, 0, MOPT_GTE0},
+ {Opt_stripe, 0, MOPT_GTE0},
+ {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
+ {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
+ {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
#ifdef CONFIG_EXT4_FS_XATTR
- case Opt_user_xattr:
- set_opt(sb, XATTR_USER);
- break;
- case Opt_nouser_xattr:
- clear_opt(sb, XATTR_USER);
- break;
+ {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
+ {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
#else
- case Opt_user_xattr:
- case Opt_nouser_xattr:
- ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
- break;
+ {Opt_user_xattr, 0, MOPT_NOSUPPORT},
+ {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
#endif
#ifdef CONFIG_EXT4_FS_POSIX_ACL
- case Opt_acl:
- set_opt(sb, POSIX_ACL);
- break;
- case Opt_noacl:
- clear_opt(sb, POSIX_ACL);
- break;
+ {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
+ {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
#else
- case Opt_acl:
- case Opt_noacl:
- ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
- break;
+ {Opt_acl, 0, MOPT_NOSUPPORT},
+ {Opt_noacl, 0, MOPT_NOSUPPORT},
#endif
- case Opt_journal_dev:
- if (is_remount) {
+ {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
+ {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
+ {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
+ {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
+ MOPT_SET | MOPT_Q},
+ {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
+ MOPT_SET | MOPT_Q},
+ {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
+ EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
+ {Opt_usrjquota, 0, MOPT_Q},
+ {Opt_grpjquota, 0, MOPT_Q},
+ {Opt_offusrjquota, 0, MOPT_Q},
+ {Opt_offgrpjquota, 0, MOPT_Q},
+ {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
+ {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
+ {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
+ {Opt_err, 0, 0}
+};
+
+static int handle_mount_opt(struct super_block *sb, char *opt, int token,
+ substring_t *args, unsigned long *journal_devnum,
+ unsigned int *journal_ioprio, int is_remount)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ const struct mount_opts *m;
+ int arg = 0;
+
+ if (args->from && match_int(args, &arg))
+ return -1;
+ switch (token) {
+ case Opt_sb:
+ return 1; /* handled by get_sb_block() */
+ case Opt_removed:
+ ext4_msg(sb, KERN_WARNING,
+ "Ignoring removed %s option", opt);
+ return 1;
+ case Opt_resuid:
+ sbi->s_resuid = arg;
+ return 1;
+ case Opt_resgid:
+ sbi->s_resgid = arg;
+ return 1;
+ case Opt_abort:
+ sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
+ return 1;
+ case Opt_i_version:
+ sb->s_flags |= MS_I_VERSION;
+ return 1;
+ case Opt_journal_dev:
+ if (is_remount) {
+ ext4_msg(sb, KERN_ERR,
+ "Cannot specify journal on remount");
+ return -1;
+ }
+ *journal_devnum = arg;
+ return 1;
+ case Opt_journal_ioprio:
+ if (arg < 0 || arg > 7)
+ return -1;
+ *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
+ return 1;
+ }
+
+ for (m = ext4_mount_opts; m->token != Opt_err; m++) {
+ if (token != m->token)
+ continue;
+ if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
+ return -1;
+ if (m->flags & MOPT_EXPLICIT)
+ set_opt2(sb, EXPLICIT_DELALLOC);
+ if (m->flags & MOPT_CLEAR_ERR)
+ clear_opt(sb, ERRORS_MASK);
+ if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
+ ext4_msg(sb, KERN_ERR, "Cannot change quota "
+ "options when quota turned on");
+ return -1;
+ }
+
+ if (m->flags & MOPT_NOSUPPORT) {
+ ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
+ } else if (token == Opt_commit) {
+ if (arg == 0)
+ arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
+ sbi->s_commit_interval = HZ * arg;
+ } else if (token == Opt_max_batch_time) {
+ if (arg == 0)
+ arg = EXT4_DEF_MAX_BATCH_TIME;
+ sbi->s_max_batch_time = arg;
+ } else if (token == Opt_min_batch_time) {
+ sbi->s_min_batch_time = arg;
+ } else if (token == Opt_inode_readahead_blks) {
+ if (arg > (1 << 30))
+ return -1;
+ if (arg && !is_power_of_2(arg)) {
ext4_msg(sb, KERN_ERR,
- "Cannot specify journal on remount");
- return 0;
+ "EXT4-fs: inode_readahead_blks"
+ " must be a power of 2");
+ return -1;
}
- if (match_int(&args[0], &option))
- return 0;
- *journal_devnum = option;
- break;
- case Opt_journal_checksum:
- set_opt(sb, JOURNAL_CHECKSUM);
- break;
- case Opt_journal_async_commit:
- set_opt(sb, JOURNAL_ASYNC_COMMIT);
- set_opt(sb, JOURNAL_CHECKSUM);
- break;
- case Opt_noload:
- set_opt(sb, NOLOAD);
- break;
- case Opt_commit:
- if (match_int(&args[0], &option))
- return 0;
- if (option < 0)
- return 0;
- if (option == 0)
- option = JBD2_DEFAULT_MAX_COMMIT_AGE;
- sbi->s_commit_interval = HZ * option;
- break;
- case Opt_max_batch_time:
- if (match_int(&args[0], &option))
- return 0;
- if (option < 0)
- return 0;
- if (option == 0)
- option = EXT4_DEF_MAX_BATCH_TIME;
- sbi->s_max_batch_time = option;
- break;
- case Opt_min_batch_time:
- if (match_int(&args[0], &option))
- return 0;
- if (option < 0)
- return 0;
- sbi->s_min_batch_time = option;
- break;
- case Opt_data_journal:
- data_opt = EXT4_MOUNT_JOURNAL_DATA;
- goto datacheck;
- case Opt_data_ordered:
- data_opt = EXT4_MOUNT_ORDERED_DATA;
- goto datacheck;
- case Opt_data_writeback:
- data_opt = EXT4_MOUNT_WRITEBACK_DATA;
- datacheck:
+ sbi->s_inode_readahead_blks = arg;
+ } else if (token == Opt_init_itable) {
+ set_opt(sb, INIT_INODE_TABLE);
+ if (!args->from)
+ arg = EXT4_DEF_LI_WAIT_MULT;
+ sbi->s_li_wait_mult = arg;
+ } else if (token == Opt_stripe) {
+ sbi->s_stripe = arg;
+ } else if (m->flags & MOPT_DATAJ) {
if (is_remount) {
if (!sbi->s_journal)
ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
- else if (test_opt(sb, DATA_FLAGS) != data_opt) {
+ else if (test_opt(sb, DATA_FLAGS) !=
+ m->mount_opt) {
ext4_msg(sb, KERN_ERR,
- "Cannot change data mode on remount");
- return 0;
+ "Cannot change data mode on remount");
+ return -1;
}
} else {
clear_opt(sb, DATA_FLAGS);
- sbi->s_mount_opt |= data_opt;
+ sbi->s_mount_opt |= m->mount_opt;
}
- break;
- case Opt_data_err_abort:
- set_opt(sb, DATA_ERR_ABORT);
- break;
- case Opt_data_err_ignore:
- clear_opt(sb, DATA_ERR_ABORT);
- break;
#ifdef CONFIG_QUOTA
- case Opt_usrjquota:
+ } else if (token == Opt_usrjquota) {
if (!set_qf_name(sb, USRQUOTA, &args[0]))
- return 0;
- break;
- case Opt_grpjquota:
+ return -1;
+ } else if (token == Opt_grpjquota) {
if (!set_qf_name(sb, GRPQUOTA, &args[0]))
- return 0;
- break;
- case Opt_offusrjquota:
+ return -1;
+ } else if (token == Opt_offusrjquota) {
if (!clear_qf_name(sb, USRQUOTA))
- return 0;
- break;
- case Opt_offgrpjquota:
+ return -1;
+ } else if (token == Opt_offgrpjquota) {
if (!clear_qf_name(sb, GRPQUOTA))
- return 0;
- break;
-
- case Opt_jqfmt_vfsold:
- qfmt = QFMT_VFS_OLD;
- goto set_qf_format;
- case Opt_jqfmt_vfsv0:
- qfmt = QFMT_VFS_V0;
- goto set_qf_format;
- case Opt_jqfmt_vfsv1:
- qfmt = QFMT_VFS_V1;
-set_qf_format:
+ return -1;
+ } else if (m->flags & MOPT_QFMT) {
if (sb_any_quota_loaded(sb) &&
- sbi->s_jquota_fmt != qfmt) {
- ext4_msg(sb, KERN_ERR, "Cannot change "
- "journaled quota options when "
- "quota turned on");
- return 0;
+ sbi->s_jquota_fmt != m->mount_opt) {
+ ext4_msg(sb, KERN_ERR, "Cannot "
+ "change journaled quota options "
+ "when quota turned on");
+ return -1;
}
- sbi->s_jquota_fmt = qfmt;
- break;
- case Opt_quota:
- case Opt_usrquota:
- set_opt(sb, QUOTA);
- set_opt(sb, USRQUOTA);
- break;
- case Opt_grpquota:
- set_opt(sb, QUOTA);
- set_opt(sb, GRPQUOTA);
- break;
- case Opt_noquota:
- if (sb_any_quota_loaded(sb)) {
- ext4_msg(sb, KERN_ERR, "Cannot change quota "
- "options when quota turned on");
- return 0;
- }
- clear_opt(sb, QUOTA);
- clear_opt(sb, USRQUOTA);
- clear_opt(sb, GRPQUOTA);
- break;
-#else
- case Opt_quota:
- case Opt_usrquota:
- case Opt_grpquota:
- ext4_msg(sb, KERN_ERR,
- "quota options not supported");
- break;
- case Opt_usrjquota:
- case Opt_grpjquota:
- case Opt_offusrjquota:
- case Opt_offgrpjquota:
- case Opt_jqfmt_vfsold:
- case Opt_jqfmt_vfsv0:
- case Opt_jqfmt_vfsv1:
- ext4_msg(sb, KERN_ERR,
- "journaled quota options not supported");
- break;
- case Opt_noquota:
- break;
+ sbi->s_jquota_fmt = m->mount_opt;
#endif
- case Opt_abort:
- sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
- break;
- case Opt_nobarrier:
- clear_opt(sb, BARRIER);
- break;
- case Opt_barrier:
- if (args[0].from) {
- if (match_int(&args[0], &option))
- return 0;
- } else
- option = 1; /* No argument, default to 1 */
- if (option)
- set_opt(sb, BARRIER);
- else
- clear_opt(sb, BARRIER);
- break;
- case Opt_i_version:
- sb->s_flags |= MS_I_VERSION;
- break;
- case Opt_nodelalloc:
- clear_opt(sb, DELALLOC);
- clear_opt2(sb, EXPLICIT_DELALLOC);
- break;
- case Opt_mblk_io_submit:
- set_opt(sb, MBLK_IO_SUBMIT);
- break;
- case Opt_nomblk_io_submit:
- clear_opt(sb, MBLK_IO_SUBMIT);
- break;
- case Opt_stripe:
- if (match_int(&args[0], &option))
- return 0;
- if (option < 0)
- return 0;
- sbi->s_stripe = option;
- break;
- case Opt_delalloc:
- set_opt(sb, DELALLOC);
- set_opt2(sb, EXPLICIT_DELALLOC);
- break;
- case Opt_block_validity:
- set_opt(sb, BLOCK_VALIDITY);
- break;
- case Opt_noblock_validity:
- clear_opt(sb, BLOCK_VALIDITY);
- break;
- case Opt_inode_readahead_blks:
- if (match_int(&args[0], &option))
- return 0;
- if (option < 0 || option > (1 << 30))
- return 0;
- if (option && !is_power_of_2(option)) {
- ext4_msg(sb, KERN_ERR,
- "EXT4-fs: inode_readahead_blks"
- " must be a power of 2");
- return 0;
+ } else {
+ if (!args->from)
+ arg = 1;
+ if (m->flags & MOPT_CLEAR)
+ arg = !arg;
+ else if (unlikely(!(m->flags & MOPT_SET))) {
+ ext4_msg(sb, KERN_WARNING,
+ "buggy handling of option %s", opt);
+ WARN_ON(1);
+ return -1;
}
- sbi->s_inode_readahead_blks = option;
- break;
- case Opt_journal_ioprio:
- if (match_int(&args[0], &option))
- return 0;
- if (option < 0 || option > 7)
- break;
- *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
- option);
- break;
- case Opt_noauto_da_alloc:
- set_opt(sb, NO_AUTO_DA_ALLOC);
- break;
- case Opt_auto_da_alloc:
- if (args[0].from) {
- if (match_int(&args[0], &option))
- return 0;
- } else
- option = 1; /* No argument, default to 1 */
- if (option)
- clear_opt(sb, NO_AUTO_DA_ALLOC);
+ if (arg != 0)
+ sbi->s_mount_opt |= m->mount_opt;
else
- set_opt(sb,NO_AUTO_DA_ALLOC);
- break;
- case Opt_discard:
- set_opt(sb, DISCARD);
- break;
- case Opt_nodiscard:
- clear_opt(sb, DISCARD);
- break;
- case Opt_dioread_nolock:
- set_opt(sb, DIOREAD_NOLOCK);
- break;
- case Opt_dioread_lock:
- clear_opt(sb, DIOREAD_NOLOCK);
- break;
- case Opt_init_itable:
- set_opt(sb, INIT_INODE_TABLE);
- if (args[0].from) {
- if (match_int(&args[0], &option))
- return 0;
- } else
- option = EXT4_DEF_LI_WAIT_MULT;
- if (option < 0)
- return 0;
- sbi->s_li_wait_mult = option;
- break;
- case Opt_noinit_itable:
- clear_opt(sb, INIT_INODE_TABLE);
- break;
- default:
- ext4_msg(sb, KERN_ERR,
- "Unrecognized mount option \"%s\" "
- "or missing value", p);
- return 0;
+ sbi->s_mount_opt &= ~m->mount_opt;
}
+ return 1;
+ }
+ ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
+ "or missing value", opt);
+ return -1;
+}
+
+static int parse_options(char *options, struct super_block *sb,
+ unsigned long *journal_devnum,
+ unsigned int *journal_ioprio,
+ int is_remount)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ char *p;
+ substring_t args[MAX_OPT_ARGS];
+ int token;
+
+ if (!options)
+ return 1;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ if (!*p)
+ continue;
+ /*
+ * Initialize args struct so we know whether arg was
+ * found; some options take optional arguments.
+ */
+ args[0].to = args[0].from = 0;
+ token = match_token(p, tokens, args);
+ if (handle_mount_opt(sb, p, token, args, journal_devnum,
+ journal_ioprio, is_remount) < 0)
+ return 0;
}
#ifdef CONFIG_QUOTA
if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
--
1.7.9.107.g97f9a
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