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fs: new API for handling inode->i_version

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Add a documentation blob that explains what the i_version field is, how
it is expected to work, and how it is currently implemented by various
filesystems.

We already have inode_inc_iversion. Add several other functions for
manipulating and accessing the i_version counter. For now, the
implementation is trivial and basically works the way that all of the
open-coded i_version accesses work today.

Future patches will convert existing users of i_version to use the new
API, and then convert the backend implementation to do things more
efficiently.

Signed-off-by: Jeff Layton <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
This commit is contained in:
Jeff Layton 2018-01-29 06:41:30 -05:00
commit ae5e165d85
9 changed files with 249 additions and 15 deletions
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1
fs/ext4/inode.c
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@ -39,6 +39,7 @@
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/iomap.h>
#include <linux/iversion.h>
#include "ext4_jbd2.h"
#include "xattr.h"

1
fs/ext4/namei.c
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@ -34,6 +34,7 @@
#include <linux/quotaops.h>
#include <linux/buffer_head.h>
#include <linux/bio.h>
#include <linux/iversion.h>
#include "ext4.h"
#include "ext4_jbd2.h"