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ovl: Add an inode flag OVL_CONST_INO 

Add an ovl_inode flag OVL_CONST_INO.  This flag signifies if inode number
will remain constant over copy up or not.  This flag does not get updated
over copy up and remains unmodifed after setting once.

Next patch in the series will make use of this flag.  It will basically
figure out if dentry is of type ORIGIN or not.  And this can be derived by
this flag.

ORIGIN = (upperdentry && ovl_test_flag(OVL_CONST_INO, inode)).

Suggested-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Vivek Goyal 2018-05-11 11:49:32 -04:00 committed by Miklos Szeredi
parent 0b17c28af1
commit a00c2d59e9
2 changed files with 5 additions and 0 deletions
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3
fs/overlayfs/inode.c
View File

@ -883,6 +883,9 @@ struct inode *ovl_get_inode(struct super_block *sb,
OVL_I(inode)->redirect = oip->redirect; OVL_I(inode)->redirect = oip->redirect;
if (bylower)
ovl_set_flag(OVL_CONST_INO, inode);
/* Check for non-merge dir that may have whiteouts */ /* Check for non-merge dir that may have whiteouts */
if (is_dir) { if (is_dir) {
if (((upperdentry && lowerdentry) || oip->numlower > 1) || if (((upperdentry && lowerdentry) || oip->numlower > 1) ||

2
fs/overlayfs/overlayfs.h
View File

@ -38,6 +38,8 @@ enum ovl_inode_flag {
OVL_WHITEOUTS, OVL_WHITEOUTS,
OVL_INDEX, OVL_INDEX,
OVL_UPPERDATA, OVL_UPPERDATA,
/* Inode number will remain constant over copy up. */
OVL_CONST_INO,
}; };
enum ovl_entry_flag { enum ovl_entry_flag {