diff options
| author | Vivek Goyal | 2018-05-11 11:49:30 -0400 |
|---|---|---|
| committer | Miklos Szeredi | 2018-07-20 09:56:09 +0200 |
| commit | 4f93b426ab3930952eca6c5c456c2223a3adcbf5 (patch) | |
| tree | 17fd2e4590d6c1c2823598cecca0e8700ab2d09b /fs/overlayfs | |
| parent | 9d3dfea3d35a3235f0f1e2ce719bb4f0b696caa2 (diff) | |
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>
Diffstat (limited to 'fs/overlayfs')
| -rw-r--r-- | fs/overlayfs/copy_up.c | 13 | ||||
| -rw-r--r-- | fs/overlayfs/overlayfs.h | 1 | ||||
| -rw-r--r-- | fs/overlayfs/util.c | 12 |
3 files changed, 22 insertions, 4 deletions
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c index 7e6664d6643d..d9a8d9291358 100644 --- a/fs/overlayfs/copy_up.c +++ b/fs/overlayfs/copy_up.c @@ -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; diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h index 2de8e11db81a..a59c546c10cf 100644 --- a/fs/overlayfs/overlayfs.h +++ b/fs/overlayfs/overlayfs.h @@ -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); diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c index ab9a8fae0f99..32ff67fa0bfb 100644 --- a/fs/overlayfs/util.c +++ b/fs/overlayfs/util.c @@ -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); |