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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>
This commit is contained in:
Jean Noel Cordenner 2008-01-28 23:58:27 -05:00 committed by Theodore Ts'o
parent 818d276ceb
commit 7a224228ed
4 changed files with 33 additions and 6 deletions
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9
fs/afs/dir.c
View File

@ -546,11 +546,11 @@ static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
dentry->d_op = &afs_fs_dentry_operations;
d_add(dentry, inode);
_leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%lu }",
_leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }",
fid.vnode,
fid.unique,
dentry->d_inode->i_ino,
dentry->d_inode->i_version);
(unsigned long long)dentry->d_inode->i_version);
return NULL;
}
@ -630,9 +630,10 @@ static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
* been deleted and replaced, and the original vnode ID has
* been reused */
if (fid.unique != vnode->fid.unique) {
_debug("%s: file deleted (uq %u -> %u I:%lu)",
_debug("%s: file deleted (uq %u -> %u I:%llu)",
dentry->d_name.name, fid.unique,
vnode->fid.unique, dentry->d_inode->i_version);
vnode->fid.unique,
(unsigned long long)dentry->d_inode->i_version);
spin_lock(&vnode->lock);
set_bit(AFS_VNODE_DELETED, &vnode->flags);
spin_unlock(&vnode->lock);

3
fs/afs/inode.c
View File

@ -301,7 +301,8 @@ int afs_getattr(struct vfsmount *mnt, struct dentry *dentry,
inode = dentry->d_inode;
_enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version);
_enter("{ ino=%lu v=%llu }", inode->i_ino,
(unsigned long long)inode->i_version);
generic_fillattr(inode, stat);
return 0;

22
fs/inode.c
View File

@ -1242,6 +1242,23 @@ void touch_atime(struct vfsmount *mnt, struct dentry *dentry)
}
EXPORT_SYMBOL(touch_atime);
/**
* 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
*
*/
void inode_inc_iversion(struct inode *inode)
{
spin_lock(&inode->i_lock);
inode->i_version++;
spin_unlock(&inode->i_lock);
}
/**
* file_update_time - update mtime and ctime time
* @file: file accessed
@ -1276,6 +1293,11 @@ void file_update_time(struct file *file)
sync_it = 1;
}
if (IS_I_VERSION(inode)) {
inode_inc_iversion(inode);
sync_it = 1;
}
if (sync_it)
mark_inode_dirty_sync(inode);
}

5
include/linux/fs.h
View File

@ -124,6 +124,7 @@ extern int dir_notify_enable;
#define MS_SHARED (1<<20) /* change to shared */
#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
#define MS_I_VERSION (1<<23) /* Update inode I_version field */
#define MS_ACTIVE (1<<30)
#define MS_NOUSER (1<<31)
@ -173,6 +174,7 @@ extern int dir_notify_enable;
((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
#define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME)
#define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION)
#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA)
#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
@ -599,7 +601,7 @@ struct inode {
uid_t i_uid;
gid_t i_gid;
dev_t i_rdev;
unsigned long i_version;
u64 i_version;
loff_t i_size;
#ifdef __NEED_I_SIZE_ORDERED
seqcount_t i_size_seqcount;
@ -1394,6 +1396,7 @@ static inline void inode_dec_link_count(struct inode *inode)
mark_inode_dirty(inode);
}
extern void inode_inc_iversion(struct inode *inode);
extern void touch_atime(struct vfsmount *mnt, struct dentry *dentry);
static inline void file_accessed(struct file *file)
{