From 25ec56b518257a56d2ff41a941d288e4b5ff9488 Mon Sep 17 00:00:00 2001 From: Jean Noel Cordenner Date: Mon, 28 Jan 2008 23:58:27 -0500 Subject: 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 Signed-off-by: Andreas Dilger Signed-off-by: Kalpak Shah Signed-off-by: Aneesh Kumar K.V Signed-off-by: Jean Noel Cordenner --- include/linux/fs.h | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) (limited to 'include/linux/fs.h') 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) { -- cgit v1.2.3