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| author | Jean Noel Cordenner <jean-noel.cordenner@bull.net> | 2008-01-29 07:58:27 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-01-29 07:58:27 +0300 |
| commit | 25ec56b518257a56d2ff41a941d288e4b5ff9488 (patch) | |
| tree | 77e84d38a5ad242f9d73a006f009649f223378f1 /include | |
| parent | 7a224228ed79d587ece2304869000aad1b8e97dd (diff) | |
| download | linux-25ec56b518257a56d2ff41a941d288e4b5ff9488.tar.xz | |
ext4: Add inode version support in ext4
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/ext4_fs.h | 6 | ||||
| -rw-r--r-- | include/linux/fs.h | 16 |
2 files changed, 20 insertions, 2 deletions
diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h index cd406dba0e64..b6092940c8b8 100644 --- a/include/linux/ext4_fs.h +++ b/include/linux/ext4_fs.h @@ -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 diff --git a/include/linux/fs.h b/include/linux/fs.h index 9608839552b3..a516b6716870 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -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) { |