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ext4: Add mount options in superblock 

Allow mount options to be stored in the superblock.  Also add default
mount option bits for nobarrier, block_validity, discard, and nodelalloc.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2010-08-01 23:14:20 -04:00
parent ca0e05e4b1
commit 8b67f04ab9
2 changed files with 30 additions and 8 deletions
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9
fs/ext4/ext4.h
View File

@ -1025,8 +1025,9 @@ struct ext4_super_block {
__le32 s_last_error_line; /* line number where error happened */
__le64 s_last_error_block; /* block involved of last error */
__u8 s_last_error_func[32]; /* function where the error happened */
#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_reserved)
__le32 s_reserved[128]; /* Padding to the end of the block */
#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
__u8 s_mount_opts[64];
__le32 s_reserved[112]; /* Padding to the end of the block */
};
#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
@ -1341,6 +1342,10 @@ EXT4_INODE_BIT_FNS(state, state_flags)
#define EXT4_DEFM_JMODE_DATA 0x0020
#define EXT4_DEFM_JMODE_ORDERED 0x0040
#define EXT4_DEFM_JMODE_WBACK 0x0060
#define EXT4_DEFM_NOBARRIER 0x0100
#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
#define EXT4_DEFM_DISCARD 0x0400
#define EXT4_DEFM_NODELALLOC 0x0800
/*
* Default journal batch times

29
fs/ext4/super.c
View File

@ -1003,10 +1003,10 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
seq_puts(seq, ",journal_checksum");
if (test_opt(sb, I_VERSION))
seq_puts(seq, ",i_version");
if (!test_opt(sb, DELALLOC))
if (!test_opt(sb, DELALLOC) &&
!(def_mount_opts & EXT4_DEFM_NODELALLOC))
seq_puts(seq, ",nodelalloc");
if (sbi->s_stripe)
seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
/*
@ -1030,7 +1030,7 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
if (test_opt(sb, NO_AUTO_DA_ALLOC))
seq_puts(seq, ",noauto_da_alloc");
if (test_opt(sb, DISCARD))
if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
seq_puts(seq, ",discard");
if (test_opt(sb, NOLOAD))
@ -1039,6 +1039,10 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
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");
ext4_show_quota_options(seq, sb);
return 0;
@ -2655,6 +2659,10 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
set_opt(sbi->s_mount_opt, ERRORS_CONT);
else
set_opt(sbi->s_mount_opt, ERRORS_RO);
if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
if (def_mount_opts & EXT4_DEFM_DISCARD)
set_opt(sbi->s_mount_opt, DISCARD);
sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
@ -2662,15 +2670,23 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
set_opt(sbi->s_mount_opt, BARRIER);
if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
set_opt(sbi->s_mount_opt, BARRIER);
/*
* enable delayed allocation by default
* Use -o nodelalloc to turn it off
*/
if (!IS_EXT3_SB(sb))
if (!IS_EXT3_SB(sb) &&
((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
set_opt(sbi->s_mount_opt, DELALLOC);
if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
&journal_devnum, &journal_ioprio, NULL, 0)) {
ext4_msg(sb, KERN_WARNING,
"failed to parse options in superblock: %s",
sbi->s_es->s_mount_opts);
}
if (!parse_options((char *) data, sb, &journal_devnum,
&journal_ioprio, NULL, 0))
goto failed_mount;
@ -3141,7 +3157,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
descr = "out journal";
ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
"Opts: %s", descr, orig_data);
"Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
*sbi->s_es->s_mount_opts ? "; " : "", orig_data);
init_timer(&sbi->s_err_report);
sbi->s_err_report.function = print_daily_error_info;