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ovl: rearrange code in ovl_copy_up_locked()

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As preparation to implementing copy up with O_TMPFILE,
name the variable for dentry before final rename 'temp' and
assign it to 'newdentry' only after rename.

Also lookup upper dentry before looking up temp dentry and
move ovl_set_timestamps() into ovl_copy_up_locked(), because
that is going to be more convenient for upcoming change.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein 2017-01-17 06:34:54 +02:00 • committed by Miklos Szeredi
parent e7f52429b4
commit 42f269b925
1 changed files with 25 additions and 24 deletions
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49
fs/overlayfs/copy_up.c
View file

@ -232,12 +232,14 @@ int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat)
static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir, static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
struct dentry *dentry, struct path *lowerpath, struct dentry *dentry, struct path *lowerpath,
struct kstat *stat, const char *link) struct kstat *stat, const char *link,
struct kstat *pstat)
{ {
struct inode *wdir = workdir->d_inode; struct inode *wdir = workdir->d_inode;
struct inode *udir = upperdir->d_inode; struct inode *udir = upperdir->d_inode;
struct dentry *newdentry = NULL; struct dentry *newdentry = NULL;
struct dentry *upper = NULL; struct dentry *upper = NULL;
struct dentry *temp = NULL;
int err; int err;
const struct cred *old_creds = NULL; const struct cred *old_creds = NULL;
struct cred *new_creds = NULL; struct cred *new_creds = NULL;
@ -248,25 +250,25 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
.link = link .link = link
}; };
newdentry = ovl_lookup_temp(workdir, dentry);
err = PTR_ERR(newdentry);
if (IS_ERR(newdentry))
goto out;
upper = lookup_one_len(dentry->d_name.name, upperdir, upper = lookup_one_len(dentry->d_name.name, upperdir,
dentry->d_name.len); dentry->d_name.len);
err = PTR_ERR(upper); err = PTR_ERR(upper);
if (IS_ERR(upper)) if (IS_ERR(upper))
goto out1; goto out;
err = security_inode_copy_up(dentry, &new_creds); err = security_inode_copy_up(dentry, &new_creds);
if (err < 0) if (err < 0)
goto out2; goto out1;
if (new_creds) if (new_creds)
old_creds = override_creds(new_creds); old_creds = override_creds(new_creds);
err = ovl_create_real(wdir, newdentry, &cattr, NULL, true); temp = ovl_lookup_temp(workdir, dentry);
err = PTR_ERR(temp);
if (IS_ERR(temp))
goto out1;
err = ovl_create_real(wdir, temp, &cattr, NULL, true);
if (new_creds) { if (new_creds) {
revert_creds(old_creds); revert_creds(old_creds);
@ -281,39 +283,42 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
ovl_path_upper(dentry, &upperpath); ovl_path_upper(dentry, &upperpath);
BUG_ON(upperpath.dentry != NULL); BUG_ON(upperpath.dentry != NULL);
upperpath.dentry = newdentry; upperpath.dentry = temp;
err = ovl_copy_up_data(lowerpath, &upperpath, stat->size); err = ovl_copy_up_data(lowerpath, &upperpath, stat->size);
if (err) if (err)
goto out_cleanup; goto out_cleanup;
} }
err = ovl_copy_xattr(lowerpath->dentry, newdentry); err = ovl_copy_xattr(lowerpath->dentry, temp);
if (err) if (err)
goto out_cleanup; goto out_cleanup;
inode_lock(newdentry->d_inode); inode_lock(temp->d_inode);
err = ovl_set_attr(newdentry, stat); err = ovl_set_attr(temp, stat);
inode_unlock(newdentry->d_inode); inode_unlock(temp->d_inode);
if (err) if (err)
goto out_cleanup; goto out_cleanup;
err = ovl_do_rename(wdir, newdentry, udir, upper, 0); err = ovl_do_rename(wdir, temp, udir, upper, 0);
if (err) if (err)
goto out_cleanup; goto out_cleanup;
newdentry = dget(temp);
ovl_dentry_update(dentry, newdentry); ovl_dentry_update(dentry, newdentry);
ovl_inode_update(d_inode(dentry), d_inode(newdentry)); ovl_inode_update(d_inode(dentry), d_inode(newdentry));
newdentry = NULL;
/* Restore timestamps on parent (best effort) */
ovl_set_timestamps(upperdir, pstat);
out2: out2:
dput(upper); dput(temp);
out1: out1:
dput(newdentry); dput(upper);
out: out:
return err; return err;
out_cleanup: out_cleanup:
ovl_cleanup(wdir, newdentry); ovl_cleanup(wdir, temp);
goto out2; goto out2;
} }
@ -368,11 +373,7 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
} }
err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath, err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath,
stat, link); stat, link, &pstat);
if (!err) {
/* Restore timestamps on parent (best effort) */
ovl_set_timestamps(upperdir, &pstat);
}
out_unlock: out_unlock:
unlock_rename(workdir, upperdir); unlock_rename(workdir, upperdir);
do_delayed_call(&done); do_delayed_call(&done);