vfs: Add 64 bit i_version support
The i_version field of the inode is changed to be a 64-bit counter that is set on every inode creation and that is incremented every time the inode data is modified (similarly to the "ctime" time-stamp). The aim is to fulfill a NFSv4 requirement for rfc3530. This first part concerns the vfs, it converts the 32-bit i_version in the generic inode to a 64-bit, a flag is added in the super block in order to check if the feature is enabled and the i_version is incremented in the vfs. Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: Jean Noel Cordenner <jean-noel.cordenner@bull.net> Signed-off-by: Kalpak Shah <kalpak@clusterfs.com>
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committed by
Theodore Ts'o
parent
818d276ceb
commit
7a224228ed
@@ -124,6 +124,7 @@ extern int dir_notify_enable;
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#define MS_SHARED (1<<20) /* change to shared */
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#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
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#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
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#define MS_I_VERSION (1<<23) /* Update inode I_version field */
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#define MS_ACTIVE (1<<30)
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#define MS_NOUSER (1<<31)
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@@ -173,6 +174,7 @@ extern int dir_notify_enable;
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((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
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#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
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#define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
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#define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
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#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
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#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
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@@ -599,7 +601,7 @@ struct inode {
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uid_t i_uid;
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gid_t i_gid;
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dev_t i_rdev;
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unsigned long i_version;
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u64 i_version;
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loff_t i_size;
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#ifdef __NEED_I_SIZE_ORDERED
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seqcount_t i_size_seqcount;
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@@ -1394,6 +1396,7 @@ static inline void inode_dec_link_count(struct inode *inode)
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mark_inode_dirty(inode);
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}
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extern void inode_inc_iversion(struct inode *inode);
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extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
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static inline void file_accessed(struct file *file)
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{
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