ext4: make ext4_show_options() be table-driven

Consistently show mount options which are the non-default, so that
/proc/mounts accurately shows the mount options that would be
necessary to mount the file system in its current mode of operation.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index d70b981..6481e3c 100644 (file)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1143,6 +1143,7 @@ struct ext4_sb_info {
        unsigned int s_mount_opt;
        unsigned int s_mount_opt2;
        unsigned int s_mount_flags;
+       unsigned int s_def_mount_opt;
        ext4_fsblk_t s_sb_block;
        uid_t s_resuid;
        gid_t s_resgid;

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 7e3a319..7082869 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1198,8 +1198,8 @@ static const match_table_t tokens = {
        {Opt_nouser_xattr, "nouser_xattr"},
        {Opt_acl, "acl"},
        {Opt_noacl, "noacl"},
-       {Opt_noload, "noload"},
        {Opt_noload, "norecovery"},
+       {Opt_noload, "noload"},
        {Opt_removed, "nobh"},
        {Opt_removed, "bh"},
        {Opt_commit, "commit=%u"},
@@ -1668,6 +1668,16 @@ static inline void ext4_show_quota_options(struct seq_file *seq,
 #endif
 }
 
+static const char *token2str(int token)
+{
+       static const struct match_token *t;
+
+       for (t = tokens; t->token != Opt_err; t++)
+               if (t->token == token && !strchr(t->pattern, '='))
+                       break;
+       return t->pattern;
+}
+
 /*
  * Show an option if
  *  - it's set to a non-default value OR
@@ -1676,132 +1686,71 @@ static inline void ext4_show_quota_options(struct seq_file *seq,
 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
 {
        int def_errors;
-       unsigned long def_mount_opts;
        struct super_block *sb = root->d_sb;
        struct ext4_sb_info *sbi = EXT4_SB(sb);
        struct ext4_super_block *es = sbi->s_es;
+       const struct mount_opts *m;
 
-       def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
-       def_errors     = le16_to_cpu(es->s_errors);
+#define SEQ_OPTS_PUTS(str) seq_printf(seq, "," str)
+#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "," str, arg)
 
        if (sbi->s_sb_block != 1)
-               seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
-       if (test_opt(sb, MINIX_DF))
-               seq_puts(seq, ",minixdf");
-       if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
-               seq_puts(seq, ",grpid");
-       if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
-               seq_puts(seq, ",nogrpid");
-       if (sbi->s_resuid != EXT4_DEF_RESUID ||
-           le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
-               seq_printf(seq, ",resuid=%u", sbi->s_resuid);
+               SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
+
+       for (m = ext4_mount_opts; m->token != Opt_err; m++) {
+               int want_set = m->flags & MOPT_SET;
+               if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
+                   (m->flags & MOPT_CLEAR_ERR))
+                       continue;
+               if (!(m->mount_opt & (sbi->s_mount_opt ^ sbi->s_def_mount_opt)))
+                       continue; /* skip if same as the default */
+               if ((want_set &&
+                    (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
+                   (!want_set && (sbi->s_mount_opt & m->mount_opt)))
+                       continue; /* select Opt_noFoo vs Opt_Foo */
+               SEQ_OPTS_PRINT("%s", token2str(m->token));
        }
+
+       if (sbi->s_resuid != EXT4_DEF_RESUID ||
+           le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
+               SEQ_OPTS_PRINT("resuid=%u", sbi->s_resuid);
        if (sbi->s_resgid != EXT4_DEF_RESGID ||
-           le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
-               seq_printf(seq, ",resgid=%u", sbi->s_resgid);
-       }
-       if (test_opt(sb, ERRORS_RO)) {
-               if (def_errors == EXT4_ERRORS_PANIC ||
-                   def_errors == EXT4_ERRORS_CONTINUE) {
-                       seq_puts(seq, ",errors=remount-ro");
-               }
-       }
+           le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
+               SEQ_OPTS_PRINT("resgid=%u", sbi->s_resgid);
+       def_errors = le16_to_cpu(es->s_errors);
+       if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
+               SEQ_OPTS_PUTS("errors=remount-ro");
        if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
-               seq_puts(seq, ",errors=continue");
+               SEQ_OPTS_PUTS("errors=continue");
        if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
-               seq_puts(seq, ",errors=panic");
-       if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
-               seq_puts(seq, ",nouid32");
-       if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
-               seq_puts(seq, ",debug");
-#ifdef CONFIG_EXT4_FS_XATTR
-       if (test_opt(sb, XATTR_USER))
-               seq_puts(seq, ",user_xattr");
-       if (!test_opt(sb, XATTR_USER))
-               seq_puts(seq, ",nouser_xattr");
-#endif
-#ifdef CONFIG_EXT4_FS_POSIX_ACL
-       if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
-               seq_puts(seq, ",acl");
-       if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
-               seq_puts(seq, ",noacl");
-#endif
-       if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
-               seq_printf(seq, ",commit=%u",
-                          (unsigned) (sbi->s_commit_interval / HZ));
-       }
-       if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
-               seq_printf(seq, ",min_batch_time=%u",
-                          (unsigned) sbi->s_min_batch_time);
-       }
-       if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
-               seq_printf(seq, ",max_batch_time=%u",
-                          (unsigned) sbi->s_max_batch_time);
-       }
-
-       /*
-        * We're changing the default of barrier mount option, so
-        * let's always display its mount state so it's clear what its
-        * status is.
-        */
-       seq_puts(seq, ",barrier=");
-       seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
-       if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
-               seq_puts(seq, ",journal_async_commit");
-       else if (test_opt(sb, JOURNAL_CHECKSUM))
-               seq_puts(seq, ",journal_checksum");
+               SEQ_OPTS_PUTS("errors=panic");
+       if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
+               SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
+       if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
+               SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
+       if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
+               SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
        if (sb->s_flags & MS_I_VERSION)
-               seq_puts(seq, ",i_version");
-       if (!test_opt(sb, DELALLOC) &&
-           !(def_mount_opts & EXT4_DEFM_NODELALLOC))
-               seq_puts(seq, ",nodelalloc");
-
-       if (!test_opt(sb, MBLK_IO_SUBMIT))
-               seq_puts(seq, ",nomblk_io_submit");
+               SEQ_OPTS_PUTS("i_version");
        if (sbi->s_stripe)
-               seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
-       /*
-        * journal mode get enabled in different ways
-        * So just print the value even if we didn't specify it
-        */
-       if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
-               seq_puts(seq, ",data=journal");
-       else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
-               seq_puts(seq, ",data=ordered");
-       else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
-               seq_puts(seq, ",data=writeback");
-
+               SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
+       if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
+               if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
+                       SEQ_OPTS_PUTS("data=journal");
+               else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
+                       SEQ_OPTS_PUTS("data=ordered");
+               else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
+                       SEQ_OPTS_PUTS("data=writeback");
+       }
        if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
-               seq_printf(seq, ",inode_readahead_blks=%u",
-                          sbi->s_inode_readahead_blks);
-
-       if (test_opt(sb, DATA_ERR_ABORT))
-               seq_puts(seq, ",data_err=abort");
-
-       if (test_opt(sb, NO_AUTO_DA_ALLOC))
-               seq_puts(seq, ",noauto_da_alloc");
+               SEQ_OPTS_PRINT("inode_readahead_blks=%u",
+                              sbi->s_inode_readahead_blks);
 
-       if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
-               seq_puts(seq, ",discard");
-
-       if (test_opt(sb, NOLOAD))
-               seq_puts(seq, ",norecovery");
-
-       if (test_opt(sb, DIOREAD_NOLOCK))
-               seq_puts(seq, ",dioread_nolock");
-
-       if (test_opt(sb, BLOCK_VALIDITY) &&
-           !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY))
-               seq_puts(seq, ",block_validity");
-
-       if (!test_opt(sb, INIT_INODE_TABLE))
-               seq_puts(seq, ",noinit_itable");
-       else if (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)
-               seq_printf(seq, ",init_itable=%u",
-                          (unsigned) sbi->s_li_wait_mult);
+       if (test_opt(sb, INIT_INODE_TABLE) &&
+           (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT))
+               SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
 
        ext4_show_quota_options(seq, sb);
-
        return 0;
 }
 
@@ -3105,6 +3054,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
                         "failed to parse options in superblock: %s",
                         sbi->s_es->s_mount_opts);
        }
+       sbi->s_def_mount_opt = sbi->s_mount_opt;
        if (!parse_options((char *) data, sb, &journal_devnum,
                           &journal_ioprio, 0))
                goto failed_mount;