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ovl: Copy up meta inode data from lowest data inode 

So far lower could not be a meta inode.  So whenever it was time to copy up
data of a meta inode, we could copy it up from top most lower dentry.

But now lower itself can be a metacopy inode.  That means data copy up
needs to take place from a data inode in metacopy inode chain.  Find lower
data inode in the chain and use that for data copy up.

Introduced a helper called ovl_path_lowerdata() to find the lower data
inode chain.

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 11:49:30 -04:00 committed by Miklos Szeredi
parent 9d3dfea3d3
commit 4f93b426ab
3 changed files with 22 additions and 4 deletions
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13
fs/overlayfs/copy_up.c
View File

@ -519,13 +519,14 @@ static int ovl_copy_up_inode(struct ovl_copy_up_ctx *c, struct dentry *temp)
}
if (S_ISREG(c->stat.mode) && !c->metacopy) {
struct path upperpath;
struct path upperpath, datapath;
ovl_path_upper(c->dentry, &upperpath);
BUG_ON(upperpath.dentry != NULL);
upperpath.dentry = temp;
err = ovl_copy_up_data(&c->lowerpath, &upperpath, c->stat.size);
ovl_path_lowerdata(c->dentry, &datapath);
err = ovl_copy_up_data(&datapath, &upperpath, c->stat.size);
if (err)
return err;
}
@ -706,14 +707,18 @@ static bool ovl_need_meta_copy_up(struct dentry *dentry, umode_t mode,
/* Copy up data of an inode which was copied up metadata only in the past. */
static int ovl_copy_up_meta_inode_data(struct ovl_copy_up_ctx *c)
{
struct path upperpath;
struct path upperpath, datapath;
int err;
ovl_path_upper(c->dentry, &upperpath);
if (WARN_ON(upperpath.dentry == NULL))
return -EIO;
err = ovl_copy_up_data(&c->lowerpath, &upperpath, c->stat.size);
ovl_path_lowerdata(c->dentry, &datapath);
if (WARN_ON(datapath.dentry == NULL))
return -EIO;
err = ovl_copy_up_data(&datapath, &upperpath, c->stat.size);
if (err)
return err;

1
fs/overlayfs/overlayfs.h
View File

@ -217,6 +217,7 @@ bool ovl_dentry_weird(struct dentry *dentry);
enum ovl_path_type ovl_path_type(struct dentry *dentry);
void ovl_path_upper(struct dentry *dentry, struct path *path);
void ovl_path_lower(struct dentry *dentry, struct path *path);
void ovl_path_lowerdata(struct dentry *dentry, struct path *path);
enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
struct dentry *ovl_dentry_upper(struct dentry *dentry);
struct dentry *ovl_dentry_lower(struct dentry *dentry);

12
fs/overlayfs/util.c
View File

@ -164,6 +164,18 @@ void ovl_path_lower(struct dentry *dentry, struct path *path)
}
}
void ovl_path_lowerdata(struct dentry *dentry, struct path *path)
{
struct ovl_entry *oe = dentry->d_fsdata;
if (oe->numlower) {
path->mnt = oe->lowerstack[oe->numlower - 1].layer->mnt;
path->dentry = oe->lowerstack[oe->numlower - 1].dentry;
} else {
*path = (struct path) { };
}
}
enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path)
{
enum ovl_path_type type = ovl_path_type(dentry);