The ext4 filesystem is getting stable enough that it's time to drop
the "dev" prefix. Also remove the requirement for the TEST_FILESYS
flag.
Signed-off-by: "Theodore Ts'o" <[email protected]>
---
fs/Kconfig | 74 ++++++++++++++++++++++++++--------------------------
fs/Makefile | 2 +-
fs/ext4/Makefile | 10 +++---
fs/ext4/acl.h | 6 ++--
fs/ext4/ext4_i.h | 4 +-
fs/ext4/file.c | 2 +-
fs/ext4/inode.c | 2 +-
fs/ext4/namei.c | 6 ++--
fs/ext4/super.c | 36 +++++++++----------------
fs/ext4/symlink.c | 4 +-
fs/ext4/xattr.c | 8 +++---
fs/ext4/xattr.h | 8 +++---
12 files changed, 76 insertions(+), 86 deletions(-)
diff --git a/fs/Kconfig b/fs/Kconfig
index abccb5d..afb14f2 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -136,37 +136,37 @@ config EXT3_FS_SECURITY
If you are not using a security module that requires using
extended attributes for file security labels, say N.
-config EXT4DEV_FS
- tristate "Ext4dev/ext4 extended fs support development (EXPERIMENTAL)"
- depends on EXPERIMENTAL
+config EXT4_FS
+ tristate "The Extended 4 (ext4) filesystem"
select JBD2
select CRC16
help
- Ext4dev is a predecessor filesystem of the next generation
- extended fs ext4, based on ext3 filesystem code. It will be
- renamed ext4 fs later, once ext4dev is mature and stabilized.
+ This is the next generation of the ext3 filesystem.
Unlike the change from ext2 filesystem to ext3 filesystem,
- the on-disk format of ext4dev is not the same as ext3 any more:
- it is based on extent maps and it supports 48-bit physical block
- numbers. These combined on-disk format changes will allow
- ext4dev/ext4 to handle more than 16 TB filesystem volumes --
- a hard limit that ext3 cannot overcome without changing the
- on-disk format.
-
- Other than extent maps and 48-bit block numbers, ext4dev also is
- likely to have other new features such as persistent preallocation,
- high resolution time stamps, and larger file support etc. These
- features will be added to ext4dev gradually.
+ the on-disk format of ext4 is not backwardscompatible with
+ ext3; it is based on extent maps and it supports 48-bit
+ physical block numbers. The ext4 filesystem also supports delayed
+ allocation, persistent preallocation, high resolution time stamps,
+ and a number of other features to improve performance and speed
+ up fsck time. For more information, please see the web pages at
+ http://ext4.wiki.kernel.org.
+
+ The ext4 filesystem will support mounting an ext3
+ filesystem; while there will be some performance gains from
+ the delayed allocation and inode table readeahad, the best
+ performance gains will require enabling ext4 features in the
+ filesystem, or formating a new filesystem as an ext4
+ filesystem initially.
To compile this file system support as a module, choose M here. The
module will be called ext4dev.
If unsure, say N.
-config EXT4DEV_FS_XATTR
- bool "Ext4dev extended attributes"
- depends on EXT4DEV_FS
+config EXT4_FS_XATTR
+ bool "Ext4 extended attributes"
+ depends on EXT4_FS
default y
help
Extended attributes are name:value pairs associated with inodes by
@@ -175,11 +175,11 @@ config EXT4DEV_FS_XATTR
If unsure, say N.
- You need this for POSIX ACL support on ext4dev/ext4.
+ You need this for POSIX ACL support on ext4.
-config EXT4DEV_FS_POSIX_ACL
- bool "Ext4dev POSIX Access Control Lists"
- depends on EXT4DEV_FS_XATTR
+config EXT4_FS_POSIX_ACL
+ bool "Ext4 POSIX Access Control Lists"
+ depends on EXT4_FS_XATTR
select FS_POSIX_ACL
help
POSIX Access Control Lists (ACLs) support permissions for users and
@@ -190,14 +190,14 @@ config EXT4DEV_FS_POSIX_ACL
If you don't know what Access Control Lists are, say N
-config EXT4DEV_FS_SECURITY
- bool "Ext4dev Security Labels"
- depends on EXT4DEV_FS_XATTR
+config EXT4_FS_SECURITY
+ bool "Ext4 Security Labels"
+ depends on EXT4_FS_XATTR
help
Security labels support alternative access control models
implemented by security modules like SELinux. This option
enables an extended attribute handler for file security
- labels in the ext4dev/ext4 filesystem.
+ labels in the ext4 filesystem.
If you are not using a security module that requires using
extended attributes for file security labels, say N.
@@ -240,22 +240,22 @@ config JBD2
help
This is a generic journaling layer for block devices that support
both 32-bit and 64-bit block numbers. It is currently used by
- the ext4dev/ext4 filesystem, but it could also be used to add
+ the ext4 filesystem, but it could also be used to add
journal support to other file systems or block devices such
as RAID or LVM.
- If you are using ext4dev/ext4, you need to say Y here. If you are not
- using ext4dev/ext4 then you will probably want to say N.
+ If you are using ext4, you need to say Y here. If you are not
+ using ext4 then you will probably want to say N.
To compile this device as a module, choose M here. The module will be
- called jbd2. If you are compiling ext4dev/ext4 into the kernel,
+ called jbd2. If you are compiling ext4 into the kernel,
you cannot compile this code as a module.
config JBD2_DEBUG
- bool "JBD2 (ext4dev/ext4) debugging support"
+ bool "JBD2 (ext4) debugging support"
depends on JBD2 && DEBUG_FS
help
- If you are using the ext4dev/ext4 journaled file system (or
+ If you are using the ext4 journaled file system (or
potentially any other filesystem/device using JBD2), this option
allows you to enable debugging output while the system is running,
in order to help track down any problems you are having.
@@ -270,9 +270,9 @@ config JBD2_DEBUG
config FS_MBCACHE
# Meta block cache for Extended Attributes (ext2/ext3/ext4)
tristate
- depends on EXT2_FS_XATTR || EXT3_FS_XATTR || EXT4DEV_FS_XATTR
- default y if EXT2_FS=y || EXT3_FS=y || EXT4DEV_FS=y
- default m if EXT2_FS=m || EXT3_FS=m || EXT4DEV_FS=m
+ depends on EXT2_FS_XATTR || EXT3_FS_XATTR || EXT4_FS_XATTR
+ default y if EXT2_FS=y || EXT3_FS=y || EXT4_FS=y
+ default m if EXT2_FS=m || EXT3_FS=m || EXT4_FS=m
config REISERFS_FS
tristate "Reiserfs support"
diff --git a/fs/Makefile b/fs/Makefile
index a1482a5..de404b0 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -69,7 +69,7 @@ obj-$(CONFIG_DLM) += dlm/
# Do not add any filesystems before this line
obj-$(CONFIG_REISERFS_FS) += reiserfs/
obj-$(CONFIG_EXT3_FS) += ext3/ # Before ext2 so root fs can be ext3
-obj-$(CONFIG_EXT4DEV_FS) += ext4/ # Before ext2 so root fs can be ext4dev
+obj-$(CONFIG_EXT4_FS) += ext4/ # Before ext2 so root fs can be ext4dev
obj-$(CONFIG_JBD) += jbd/
obj-$(CONFIG_JBD2) += jbd2/
obj-$(CONFIG_EXT2_FS) += ext2/
diff --git a/fs/ext4/Makefile b/fs/ext4/Makefile
index ac6fa8c..a8ff003 100644
--- a/fs/ext4/Makefile
+++ b/fs/ext4/Makefile
@@ -2,12 +2,12 @@
# Makefile for the linux ext4-filesystem routines.
#
-obj-$(CONFIG_EXT4DEV_FS) += ext4dev.o
+obj-$(CONFIG_EXT4_FS) += ext4.o
-ext4dev-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o \
+ext4-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o \
ioctl.o namei.o super.o symlink.o hash.o resize.o extents.o \
ext4_jbd2.o migrate.o mballoc.o
-ext4dev-$(CONFIG_EXT4DEV_FS_XATTR) += xattr.o xattr_user.o xattr_trusted.o
-ext4dev-$(CONFIG_EXT4DEV_FS_POSIX_ACL) += acl.o
-ext4dev-$(CONFIG_EXT4DEV_FS_SECURITY) += xattr_security.o
+ext4-$(CONFIG_EXT4_FS_XATTR) += xattr.o xattr_user.o xattr_trusted.o
+ext4-$(CONFIG_EXT4_FS_POSIX_ACL) += acl.o
+ext4-$(CONFIG_EXT4_FS_SECURITY) += xattr_security.o
diff --git a/fs/ext4/acl.h b/fs/ext4/acl.h
index 4c9948f..cb45257 100644
--- a/fs/ext4/acl.h
+++ b/fs/ext4/acl.h
@@ -51,7 +51,7 @@ static inline int ext4_acl_count(size_t size)
}
}
-#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
/* Value for inode->u.ext4_i.i_acl and inode->u.ext4_i.i_default_acl
if the ACL has not been cached */
@@ -62,7 +62,7 @@ extern int ext4_permission(struct inode *, int);
extern int ext4_acl_chmod(struct inode *);
extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
-#else /* CONFIG_EXT4DEV_FS_POSIX_ACL */
+#else /* CONFIG_EXT4_FS_POSIX_ACL */
#include <linux/sched.h>
#define ext4_permission NULL
@@ -77,5 +77,5 @@ ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
{
return 0;
}
-#endif /* CONFIG_EXT4DEV_FS_POSIX_ACL */
+#endif /* CONFIG_EXT4_FS_POSIX_ACL */
diff --git a/fs/ext4/ext4_i.h b/fs/ext4/ext4_i.h
index 2875eec..5c124c0 100644
--- a/fs/ext4/ext4_i.h
+++ b/fs/ext4/ext4_i.h
@@ -66,7 +66,7 @@ struct ext4_inode_info {
__u32 i_state; /* Dynamic state flags for ext4 */
ext4_lblk_t i_dir_start_lookup;
-#ifdef CONFIG_EXT4DEV_FS_XATTR
+#ifdef CONFIG_EXT4_FS_XATTR
/*
* Extended attributes can be read independently of the main file
* data. Taking i_mutex even when reading would cause contention
@@ -76,7 +76,7 @@ struct ext4_inode_info {
*/
struct rw_semaphore xattr_sem;
#endif
-#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
struct posix_acl *i_acl;
struct posix_acl *i_default_acl;
#endif
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 6d5be15..6bd11fb 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -165,7 +165,7 @@ const struct inode_operations ext4_file_inode_operations = {
.truncate = ext4_truncate,
.setattr = ext4_setattr,
.getattr = ext4_getattr,
-#ifdef CONFIG_EXT4DEV_FS_XATTR
+#ifdef CONFIG_EXT4_FS_XATTR
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = ext4_listxattr,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 243de27..2c715a7 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4041,7 +4041,7 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
return inode;
ei = EXT4_I(inode);
-#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
ei->i_acl = EXT4_ACL_NOT_CACHED;
ei->i_default_acl = EXT4_ACL_NOT_CACHED;
#endif
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 5295a92..92db9e9 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1773,7 +1773,7 @@ retry:
err = PTR_ERR(inode);
if (!IS_ERR(inode)) {
init_special_inode(inode, inode->i_mode, rdev);
-#ifdef CONFIG_EXT4DEV_FS_XATTR
+#ifdef CONFIG_EXT4_FS_XATTR
inode->i_op = &ext4_special_inode_operations;
#endif
err = ext4_add_nondir(handle, dentry, inode);
@@ -2456,7 +2456,7 @@ const struct inode_operations ext4_dir_inode_operations = {
.mknod = ext4_mknod,
.rename = ext4_rename,
.setattr = ext4_setattr,
-#ifdef CONFIG_EXT4DEV_FS_XATTR
+#ifdef CONFIG_EXT4_FS_XATTR
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = ext4_listxattr,
@@ -2467,7 +2467,7 @@ const struct inode_operations ext4_dir_inode_operations = {
const struct inode_operations ext4_special_inode_operations = {
.setattr = ext4_setattr,
-#ifdef CONFIG_EXT4DEV_FS_XATTR
+#ifdef CONFIG_EXT4_FS_XATTR
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = ext4_listxattr,
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 7d86560..67ebefb 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -569,7 +569,7 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
if (!ei)
return NULL;
-#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
ei->i_acl = EXT4_ACL_NOT_CACHED;
ei->i_default_acl = EXT4_ACL_NOT_CACHED;
#endif
@@ -605,7 +605,7 @@ static void init_once(void *foo)
struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
INIT_LIST_HEAD(&ei->i_orphan);
-#ifdef CONFIG_EXT4DEV_FS_XATTR
+#ifdef CONFIG_EXT4_FS_XATTR
init_rwsem(&ei->xattr_sem);
#endif
init_rwsem(&ei->i_data_sem);
@@ -631,7 +631,7 @@ static void destroy_inodecache(void)
static void ext4_clear_inode(struct inode *inode)
{
-#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
if (EXT4_I(inode)->i_acl &&
EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
posix_acl_release(EXT4_I(inode)->i_acl);
@@ -720,7 +720,7 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
seq_puts(seq, ",debug");
if (test_opt(sb, OLDALLOC))
seq_puts(seq, ",oldalloc");
-#ifdef CONFIG_EXT4DEV_FS_XATTR
+#ifdef CONFIG_EXT4_FS_XATTR
if (test_opt(sb, XATTR_USER) &&
!(def_mount_opts & EXT4_DEFM_XATTR_USER))
seq_puts(seq, ",user_xattr");
@@ -729,7 +729,7 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
seq_puts(seq, ",nouser_xattr");
}
#endif
-#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
+#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))
@@ -1078,7 +1078,7 @@ static int parse_options(char *options, struct super_block *sb,
case Opt_orlov:
clear_opt(sbi->s_mount_opt, OLDALLOC);
break;
-#ifdef CONFIG_EXT4DEV_FS_XATTR
+#ifdef CONFIG_EXT4_FS_XATTR
case Opt_user_xattr:
set_opt(sbi->s_mount_opt, XATTR_USER);
break;
@@ -1092,7 +1092,7 @@ static int parse_options(char *options, struct super_block *sb,
"not supported\n");
break;
#endif
-#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
case Opt_acl:
set_opt(sbi->s_mount_opt, POSIX_ACL);
break;
@@ -1987,11 +1987,11 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
set_opt(sbi->s_mount_opt, GRPID);
if (def_mount_opts & EXT4_DEFM_UID16)
set_opt(sbi->s_mount_opt, NO_UID32);
-#ifdef CONFIG_EXT4DEV_FS_XATTR
+#ifdef CONFIG_EXT4_FS_XATTR
if (def_mount_opts & EXT4_DEFM_XATTR_USER)
set_opt(sbi->s_mount_opt, XATTR_USER);
#endif
-#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
if (def_mount_opts & EXT4_DEFM_ACL)
set_opt(sbi->s_mount_opt, POSIX_ACL);
#endif
@@ -2050,16 +2050,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
"running e2fsck is recommended\n");
/*
- * Since ext4 is still considered development code, we require
- * that the TEST_FILESYS flag in s->flags be set.
- */
- if (!(le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)) {
- printk(KERN_WARNING "EXT4-fs: %s: not marked "
- "OK to use with test code.\n", sb->s_id);
- goto failed_mount;
- }
-
- /*
* Check feature flags regardless of the revision level, since we
* previously didn't change the revision level when setting the flags,
* so there is a chance incompat flags are set on a rev 0 filesystem.
@@ -3580,9 +3570,9 @@ const struct file_operations ext4_ui_proc_fops = {
};
#endif
-static struct file_system_type ext4dev_fs_type = {
+static struct file_system_type ext4_fs_type = {
.owner = THIS_MODULE,
- .name = "ext4dev",
+ .name = "ext4",
.get_sb = ext4_get_sb,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
@@ -3603,7 +3593,7 @@ static int __init init_ext4_fs(void)
err = init_inodecache();
if (err)
goto out1;
- err = register_filesystem(&ext4dev_fs_type);
+ err = register_filesystem(&ext4_fs_type);
if (err)
goto out;
return 0;
@@ -3618,7 +3608,7 @@ out2:
static void __exit exit_ext4_fs(void)
{
- unregister_filesystem(&ext4dev_fs_type);
+ unregister_filesystem(&ext4_fs_type);
destroy_inodecache();
exit_ext4_xattr();
exit_ext4_mballoc();
diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
index 0013d52..00740cb 100644
--- a/fs/ext4/symlink.c
+++ b/fs/ext4/symlink.c
@@ -34,7 +34,7 @@ const struct inode_operations ext4_symlink_inode_operations = {
.readlink = generic_readlink,
.follow_link = page_follow_link_light,
.put_link = page_put_link,
-#ifdef CONFIG_EXT4DEV_FS_XATTR
+#ifdef CONFIG_EXT4_FS_XATTR
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = ext4_listxattr,
@@ -45,7 +45,7 @@ const struct inode_operations ext4_symlink_inode_operations = {
const struct inode_operations ext4_fast_symlink_inode_operations = {
.readlink = generic_readlink,
.follow_link = ext4_follow_link,
-#ifdef CONFIG_EXT4DEV_FS_XATTR
+#ifdef CONFIG_EXT4_FS_XATTR
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = ext4_listxattr,
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 8954208..10c2b04 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -99,12 +99,12 @@ static struct mb_cache *ext4_xattr_cache;
static struct xattr_handler *ext4_xattr_handler_map[] = {
[EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler,
-#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
[EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &ext4_xattr_acl_access_handler,
[EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &ext4_xattr_acl_default_handler,
#endif
[EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler,
-#ifdef CONFIG_EXT4DEV_FS_SECURITY
+#ifdef CONFIG_EXT4_FS_SECURITY
[EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler,
#endif
};
@@ -112,11 +112,11 @@ static struct xattr_handler *ext4_xattr_handler_map[] = {
struct xattr_handler *ext4_xattr_handlers[] = {
&ext4_xattr_user_handler,
&ext4_xattr_trusted_handler,
-#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
&ext4_xattr_acl_access_handler,
&ext4_xattr_acl_default_handler,
#endif
-#ifdef CONFIG_EXT4DEV_FS_SECURITY
+#ifdef CONFIG_EXT4_FS_SECURITY
&ext4_xattr_security_handler,
#endif
NULL
diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
index 814ea58..8ede88b 100644
--- a/fs/ext4/xattr.h
+++ b/fs/ext4/xattr.h
@@ -63,7 +63,7 @@ struct ext4_xattr_entry {
EXT4_I(inode)->i_extra_isize))
#define IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr)+1))
-# ifdef CONFIG_EXT4DEV_FS_XATTR
+# ifdef CONFIG_EXT4_FS_XATTR
extern struct xattr_handler ext4_xattr_user_handler;
extern struct xattr_handler ext4_xattr_trusted_handler;
@@ -88,7 +88,7 @@ extern void exit_ext4_xattr(void);
extern struct xattr_handler *ext4_xattr_handlers[];
-# else /* CONFIG_EXT4DEV_FS_XATTR */
+# else /* CONFIG_EXT4_FS_XATTR */
static inline int
ext4_xattr_get(struct inode *inode, int name_index, const char *name,
@@ -141,9 +141,9 @@ ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
#define ext4_xattr_handlers NULL
-# endif /* CONFIG_EXT4DEV_FS_XATTR */
+# endif /* CONFIG_EXT4_FS_XATTR */
-#ifdef CONFIG_EXT4DEV_FS_SECURITY
+#ifdef CONFIG_EXT4_FS_SECURITY
extern int ext4_init_security(handle_t *handle, struct inode *inode,
struct inode *dir);
#else
--
1.5.6.1.205.ge2c7.dirty
> diff --git a/fs/Kconfig b/fs/Kconfig
> index abccb5d..afb14f2 100644
> --- a/fs/Kconfig
> +++ b/fs/Kconfig
> @@ -136,37 +136,37 @@ config EXT3_FS_SECURITY
> If you are not using a security module that requires using
> extended attributes for file security labels, say N.
>
> -config EXT4DEV_FS
> - tristate "Ext4dev/ext4 extended fs support development (EXPERIMENTAL)"
> - depends on EXPERIMENTAL
> +config EXT4_FS
> + tristate "The Extended 4 (ext4) filesystem"
> select JBD2
> select CRC16
> help
> - Ext4dev is a predecessor filesystem of the next generation
> - extended fs ext4, based on ext3 filesystem code. It will be
> - renamed ext4 fs later, once ext4dev is mature and stabilized.
> + This is the next generation of the ext3 filesystem.
>
> Unlike the change from ext2 filesystem to ext3 filesystem,
> - the on-disk format of ext4dev is not the same as ext3 any more:
> - it is based on extent maps and it supports 48-bit physical block
> - numbers. These combined on-disk format changes will allow
> - ext4dev/ext4 to handle more than 16 TB filesystem volumes --
> - a hard limit that ext3 cannot overcome without changing the
> - on-disk format.
> -
> - Other than extent maps and 48-bit block numbers, ext4dev also is
> - likely to have other new features such as persistent preallocation,
> - high resolution time stamps, and larger file support etc. These
> - features will be added to ext4dev gradually.
> + the on-disk format of ext4 is not backwardscompatible with
s/backwardscompatible/backwards compatible
> + ext3; it is based on extent maps and it supports 48-bit
> + physical block numbers. The ext4 filesystem also supports delayed
> + allocation, persistent preallocation, high resolution time stamps,
> + and a number of other features to improve performance and speed
> + up fsck time. For more information, please see the web pages at
> + http://ext4.wiki.kernel.org.
> +
> + The ext4 filesystem will support mounting an ext3
> + filesystem; while there will be some performance gains from
> + the delayed allocation and inode table readeahad, the best
s/readeahad/readahead
> + performance gains will require enabling ext4 features in the
> + filesystem, or formating a new filesystem as an ext4
> + filesystem initially.
>
> To compile this file system support as a module, choose M here. The
> module will be called ext4dev.
>
> If unsure, say N.
...
> diff --git a/fs/Makefile b/fs/Makefile
> index a1482a5..de404b0 100644
> --- a/fs/Makefile
> +++ b/fs/Makefile
> @@ -69,7 +69,7 @@ obj-$(CONFIG_DLM) += dlm/
> # Do not add any filesystems before this line
> obj-$(CONFIG_REISERFS_FS) += reiserfs/
> obj-$(CONFIG_EXT3_FS) += ext3/ # Before ext2 so root fs can be ext3
> -obj-$(CONFIG_EXT4DEV_FS) += ext4/ # Before ext2 so root fs can be ext4dev
> +obj-$(CONFIG_EXT4_FS) += ext4/ # Before ext2 so root fs can be ext4dev
the tailing word is still ext4dev
> obj-$(CONFIG_JBD) += jbd/
> obj-$(CONFIG_JBD2) += jbd2/
> obj-$(CONFIG_EXT2_FS) += ext2/
On Oct 07, 2008 01:08 -0400, Theodore Ts'o wrote:
> + This is the next generation of the ext3 filesystem.
>
> Unlike the change from ext2 filesystem to ext3 filesystem,
> + the on-disk format of ext4 is not backwardscompatible with
Actually, it is not _forwards_ compatible with ext2/ext3 drivers, but
it is most certainly _backwards_ compatible with older ext3 filesystems.
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
Theodore Ts'o wrote:
> The ext4 filesystem is getting stable enough that it's time to drop
> the "dev" prefix. Also remove the requirement for the TEST_FILESYS
> flag.
What do you think of adding a MODULE_ALIAS("ext4dev"); to this change?
Poor Fedora users trying to boot a kernel with this rename and ext4(dev)
on root are failing to mount root at boot time.
mkinitrd looks at the existing fstab, sees that the rootfs is "ext4dev"
and tries to mount root as ext4dev.... this fails.
-Eric
On Fri, Oct 10, 2008 at 01:00:51PM -0500, Eric Sandeen wrote:
> Theodore Ts'o wrote:
> > The ext4 filesystem is getting stable enough that it's time to drop
> > the "dev" prefix. Also remove the requirement for the TEST_FILESYS
> > flag.
>
> What do you think of adding a MODULE_ALIAS("ext4dev"); to this change?
>
> Poor Fedora users trying to boot a kernel with this rename and ext4(dev)
> on root are failing to mount root at boot time.
>
> mkinitrd looks at the existing fstab, sees that the rootfs is "ext4dev"
> and tries to mount root as ext4dev.... this fails.
>From discussion on the irc channel; the MODULE_ALIAS() allows the
filesystem to be loaded, but mount still tries to load the wrong
filesystem, and so it fails.
I guess one thing we *could* do is register both ext4dev and ext4....
maybe with a config option for backwards compatibility? And try to
wean people off of it as quickly as possible.
- Ted