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ext4: Add inode version support in ext4

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This patch adds 64-bit inode version support to ext4. The lower 32 bits
are stored in the osd1.linux1.l_i_version field while the high 32 bits
are stored in the i_version_hi field newly created in the ext4_inode.
This field is incremented in case the ext4_inode is large enough. A
i_version mount option has been added to enable the feature.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Andreas Dilger <adilger@clusterfs.com>
Signed-off-by: Kalpak Shah <kalpak@clusterfs.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Jean Noel Cordenner <jean-noel.cordenner@bull.net>
This commit is contained in:
Jean Noel Cordenner 2008-01-28 23:58:27 -05:00 • committed by Theodore Ts'o
commit 25ec56b518
5 changed files with 45 additions and 22 deletions
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6
include/linux/ext4_fs.h
View file

@ -292,7 +292,7 @@ struct ext4_inode {
__le32 i_flags; /* File flags */
union {
struct {
__u32 l_i_reserved1;
__le32 l_i_version;
} linux1;
struct {
__u32 h_i_translator;
@ -334,6 +334,7 @@ struct ext4_inode {
__le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
__le32 i_crtime; /* File Creation time */
__le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
__le32 i_version_hi; /* high 32 bits for 64-bit version */
};
@ -407,6 +408,8 @@ do { \
raw_inode->xtime ## _extra); \
} while (0)
#define i_disk_version osd1.linux1.l_i_version
#if defined(__KERNEL__) || defined(__linux__)
#define i_reserved1 osd1.linux1.l_i_reserved1
#define i_file_acl_high osd2.linux2.l_i_file_acl_high
@ -469,6 +472,7 @@ do { \
#define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
#ifndef _LINUX_EXT2_FS_H
#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt

16
include/linux/fs.h
View file

@ -1396,7 +1396,21 @@ static inline void inode_dec_link_count(struct inode *inode)
mark_inode_dirty(inode);
}
extern void inode_inc_iversion(struct inode *inode);
/**
* inode_inc_iversion - increments i_version
* @inode: inode that need to be updated
*
* Every time the inode is modified, the i_version field will be incremented.
* The filesystem has to be mounted with i_version flag
*/
static inline void inode_inc_iversion(struct inode *inode)
{
spin_lock(&inode->i_lock);
inode->i_version++;
spin_unlock(&inode->i_lock);
}
extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
static inline void file_accessed(struct file *file)
{