Skip to content

Commit

Permalink
ext4: make ext4_show_options() be table-driven
Browse files Browse the repository at this point in the history 
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>
  • Loading branch information
Theodore Ts'o committed Mar 5, 2012
1 parent 2adf6da commit 5a916be
Show file tree
Hide file tree
Showing 2 changed files with 62 additions and 111 deletions.
1 change: 1 addition & 0 deletions fs/ext4/ext4.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down
172 changes: 61 additions & 111 deletions fs/ext4/super.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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"},
Expand Down Expand Up @@ -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
Expand All @@ -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;
}

Expand Down Expand Up @@ -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;
Expand Down

0 comments on commit 5a916be

Please sign in to comment.