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Date: Sun, 4 Mar 2012 22:08:22 -0500
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: Theodore Ts'o <tytso@....edu>
Subject: [PATCH 08/11] 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@....edu>
---
fs/ext4/ext4.h | 1 +
fs/ext4/super.c | 172 +++++++++++++++++++-----------------------------------
2 files changed, 62 insertions(+), 111 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index d70b981..6481e3c 100644
--- 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
--- 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;
--
1.7.9.107.g97f9a
--
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