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ovl: Copy up only metadata during copy up where it makes sense

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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.

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 11:49:27 -04:00 committed by Miklos Szeredi
parent bd64e57586
commit 44d5bf109a
1 changed files with 24 additions and 1 deletions
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25
fs/overlayfs/copy_up.c
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@ -388,6 +388,7 @@ struct ovl_copy_up_ctx {
bool tmpfile;
bool origin;
bool indexed;
bool metacopy;
};
static int ovl_link_up(struct ovl_copy_up_ctx *c)
@ -507,7 +508,7 @@ 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);
@ -660,6 +661,26 @@ out:
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)
{
@ -681,6 +702,8 @@ 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;