If it makes sense to copy up only metadata during copy up, do it. This
is done for regular files which are not opened for WRITE.
Right now ->metacopy is set to 0 always. Last patch in the series will
remove the hard coded statement and enable metacopy feature.
Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>
Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
---
fs/overlayfs/copy_up.c | 25 ++++++++++++++++++++++++-
1 file changed, 24 insertions(+), 1 deletion(-)
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 7e2dc41ad693..38b332d7c7e4 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -416,6 +416,7 @@ struct ovl_copy_up_ctx {
bool tmpfile;
bool origin;
bool indexed;
+ bool metacopy;
};
static int ovl_link_up(struct ovl_copy_up_ctx *c)
@@ -553,7 +554,7 @@ static int ovl_copy_up_inode(struct ovl_copy_up_ctx *c, struct dentry *temp)
return err;
}
- if (S_ISREG(c->stat.mode)) {
+ if (S_ISREG(c->stat.mode) && !c->metacopy) {
struct path upperpath;
ovl_path_upper(c->dentry, &upperpath);
@@ -708,6 +709,26 @@ static int ovl_do_copy_up(struct ovl_copy_up_ctx *c)
return err;
}
+static bool ovl_need_meta_copy_up(struct dentry *dentry, umode_t mode,
+ int flags)
+{
+ struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+
+ /* TODO: Will enable metacopy in last patch of series */
+ return false;
+
+ if (!ofs->config.metacopy)
+ return false;
+
+ if (!S_ISREG(mode))
+ return false;
+
+ if (flags && ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC)))
+ return false;
+
+ return true;
+}
+
static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
int flags)
{
@@ -729,6 +750,8 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
if (err)
return err;
+ ctx.metacopy = ovl_need_meta_copy_up(dentry, ctx.stat.mode, flags);
+
if (parent) {
ovl_path_upper(parent, &parentpath);
ctx.destdir = parentpath.dentry;
--
2.13.6
--
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