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ovl: re-structure overlay lower layers in-memory

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Define new structures to represent overlay instance lower layers and
overlay merge dir lower layers to make room for storing more per layer
information in-memory.

Instead of keeping the fs instance lower layers in an array of struct
vfsmount, keep them in an array of new struct ovl_layer, that has a
pointer to struct vfsmount.

Instead of keeping the dentry lower layers in an array of struct path,
keep them in an array of new struct ovl_path, that has a pointer to
struct dentry and to struct ovl_layer.

Add a small helper to find the fs layer id that correspopnds to a lower
struct ovl_path and use it in ovl_lookup().

[amir: split re-structure from anonymous bdev patch]

Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Chandan Rajendra
2017-07-24 01:57:54 -05:00
committed by Miklos Szeredi
parent ee023c30d7
commit b93436320c
6 changed files with 86 additions and 56 deletions
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4
fs/overlayfs/readdir.c
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@@ -1014,7 +1014,7 @@ void ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt,
}
int ovl_indexdir_cleanup(struct dentry *dentry, struct vfsmount *mnt,
struct path *lowerstack, unsigned int numlower)
struct ovl_path *lower, unsigned int numlower)
{
int err;
struct dentry *index = NULL;
@@ -1049,7 +1049,7 @@ int ovl_indexdir_cleanup(struct dentry *dentry, struct vfsmount *mnt,
index = NULL;
break;
}
err = ovl_verify_index(index, lowerstack, numlower);
err = ovl_verify_index(index, lower, numlower);
/* Cleanup stale and orphan index entries */
if (err && (err == -ESTALE || err == -ENOENT))
err = ovl_cleanup(dir, index);