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ext4: Remove journal_checksum mount option and enable it by default

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There's no real cost for the journal checksum feature, and we should
make sure it is enabled all the time.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2009-09-05 12:50:43 -04:00
parent a3710fd1ee
commit d0646f7b63
3 changed files with 7 additions and 22 deletions
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8
Documentation/filesystems/ext4.txt
View File

@ -134,15 +134,9 @@ ro Mount filesystem read only. Note that ext4 will
mount options "ro,noload" can be used to prevent mount options "ro,noload" can be used to prevent
writes to the filesystem. writes to the filesystem.
journal_checksum Enable checksumming of the journal transactions.
This will allow the recovery code in e2fsck and the
kernel to detect corruption in the kernel. It is a
compatible change and will be ignored by older kernels.
journal_async_commit Commit block can be written to disk without waiting journal_async_commit Commit block can be written to disk without waiting
for descriptor blocks. If enabled older kernels cannot for descriptor blocks. If enabled older kernels cannot
mount the device. This will enable 'journal_checksum' mount the device.
internally.
journal=update Update the ext4 file system's journal to the current journal=update Update the ext4 file system's journal to the current
format. format.

1
fs/ext4/ext4.h
View File

@ -711,7 +711,6 @@ struct ext4_inode_info {
#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */

20
fs/ext4/super.c
View File

@ -1280,11 +1280,9 @@ static int parse_options(char *options, struct super_block *sb,
*journal_devnum = option; *journal_devnum = option;
break; break;
case Opt_journal_checksum: case Opt_journal_checksum:
set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); break; /* Kept for backwards compatibility */
break;
case Opt_journal_async_commit: case Opt_journal_async_commit:
set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT); set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
break; break;
case Opt_noload: case Opt_noload:
set_opt(sbi->s_mount_opt, NOLOAD); set_opt(sbi->s_mount_opt, NOLOAD);
@ -2751,20 +2749,14 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
goto failed_mount4; goto failed_mount4;
} }
if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { jbd2_journal_set_features(sbi->s_journal,
jbd2_journal_set_features(sbi->s_journal, JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
JBD2_FEATURE_COMPAT_CHECKSUM, 0, if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
jbd2_journal_set_features(sbi->s_journal, 0, 0,
JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
} else if (test_opt(sb, JOURNAL_CHECKSUM)) { else
jbd2_journal_set_features(sbi->s_journal,
JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
jbd2_journal_clear_features(sbi->s_journal, 0, 0, jbd2_journal_clear_features(sbi->s_journal, 0, 0,
JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
} else {
jbd2_journal_clear_features(sbi->s_journal,
JBD2_FEATURE_COMPAT_CHECKSUM, 0,
JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
}
/* We have now updated the journal if required, so we can /* We have now updated the journal if required, so we can
* validate the data journaling mode. */ * validate the data journaling mode. */