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author | Miklos Szeredi <mszeredi@redhat.com> | 2018-05-16 17:51:25 +0300 |
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committer | Miklos Szeredi <mszeredi@redhat.com> | 2018-05-31 11:06:11 +0200 |
commit | 95a1c8153ad8bc99e7c4b90257f20b4f0474a9a0 (patch) | |
tree | da1fadaf2b5e9c96cab3225e596641595f0600ad /fs/overlayfs | |
parent | 471ec5dcf4e712ea81bf431a57c98d4b67416d30 (diff) | |
download | op-kernel-dev-95a1c8153ad8bc99e7c4b90257f20b4f0474a9a0.zip op-kernel-dev-95a1c8153ad8bc99e7c4b90257f20b4f0474a9a0.tar.gz |
ovl: return dentry from ovl_create_real()
Al Viro suggested to simplify callers of ovl_create_real() by
returning the created dentry (or ERR_PTR) from ovl_create_real().
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs')
-rw-r--r-- | fs/overlayfs/copy_up.c | 15 | ||||
-rw-r--r-- | fs/overlayfs/dir.c | 62 | ||||
-rw-r--r-- | fs/overlayfs/overlayfs.h | 4 | ||||
-rw-r--r-- | fs/overlayfs/super.c | 7 |
4 files changed, 40 insertions, 48 deletions
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c index 5f4c78b..d3e9c1e 100644 --- a/fs/overlayfs/copy_up.c +++ b/fs/overlayfs/copy_up.c @@ -502,19 +502,12 @@ static int ovl_get_tmpfile(struct ovl_copy_up_ctx *c, struct dentry **tempp) if (c->tmpfile) { temp = ovl_do_tmpfile(c->workdir, c->stat.mode); - if (IS_ERR(temp)) - goto temp_err; } else { - temp = ovl_lookup_temp(c->workdir); - if (IS_ERR(temp)) - goto temp_err; - - err = ovl_create_real(d_inode(c->workdir), temp, &cattr); - if (err) { - dput(temp); - goto out; - } + temp = ovl_create_real(d_inode(c->workdir), + ovl_lookup_temp(c->workdir), &cattr); } + if (IS_ERR(temp)) + goto temp_err; err = 0; *tempp = temp; out: diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c index 0fb3ef8..425ddb0 100644 --- a/fs/overlayfs/dir.c +++ b/fs/overlayfs/dir.c @@ -114,13 +114,17 @@ kill_whiteout: goto out; } -int ovl_create_real(struct inode *dir, struct dentry *newdentry, - struct ovl_cattr *attr) +struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry, + struct ovl_cattr *attr) { int err; + if (IS_ERR(newdentry)) + return newdentry; + + err = -ESTALE; if (newdentry->d_inode) - return -ESTALE; + goto out; if (attr->hardlink) { err = ovl_do_link(attr->hardlink, dir, newdentry); @@ -157,7 +161,12 @@ int ovl_create_real(struct inode *dir, struct dentry *newdentry, */ err = -ENOENT; } - return err; +out: + if (err) { + dput(newdentry); + return ERR_PTR(err); + } + return newdentry; } static int ovl_set_opaque_xerr(struct dentry *dentry, struct dentry *upper, @@ -224,14 +233,14 @@ static int ovl_create_upper(struct dentry *dentry, struct inode *inode, attr->mode &= ~current_umask(); inode_lock_nested(udir, I_MUTEX_PARENT); - newdentry = lookup_one_len(dentry->d_name.name, upperdir, - dentry->d_name.len); + newdentry = ovl_create_real(udir, + lookup_one_len(dentry->d_name.name, + upperdir, + dentry->d_name.len), + attr); err = PTR_ERR(newdentry); if (IS_ERR(newdentry)) goto out_unlock; - err = ovl_create_real(udir, newdentry, attr); - if (err) - goto out_dput; if (ovl_type_merge(dentry->d_parent) && d_is_dir(newdentry)) { /* Setting opaque here is just an optimization, allow to fail */ @@ -239,9 +248,7 @@ static int ovl_create_upper(struct dentry *dentry, struct inode *inode, } ovl_instantiate(dentry, inode, newdentry, !!attr->hardlink); - newdentry = NULL; -out_dput: - dput(newdentry); + err = 0; out_unlock: inode_unlock(udir); return err; @@ -280,15 +287,12 @@ static struct dentry *ovl_clear_empty(struct dentry *dentry, if (upper->d_parent->d_inode != udir) goto out_unlock; - opaquedir = ovl_lookup_temp(workdir); + opaquedir = ovl_create_real(wdir, ovl_lookup_temp(workdir), + OVL_CATTR(stat.mode)); err = PTR_ERR(opaquedir); if (IS_ERR(opaquedir)) goto out_unlock; - err = ovl_create_real(wdir, opaquedir, OVL_CATTR(stat.mode)); - if (err) - goto out_dput; - err = ovl_copy_xattr(upper, opaquedir); if (err) goto out_cleanup; @@ -318,7 +322,6 @@ static struct dentry *ovl_clear_empty(struct dentry *dentry, out_cleanup: ovl_cleanup(wdir, opaquedir); -out_dput: dput(opaquedir); out_unlock: unlock_rename(workdir, upperdir); @@ -379,20 +382,16 @@ static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode, if (err) goto out; - newdentry = ovl_lookup_temp(workdir); - err = PTR_ERR(newdentry); - if (IS_ERR(newdentry)) - goto out_unlock; - upper = lookup_one_len(dentry->d_name.name, upperdir, dentry->d_name.len); err = PTR_ERR(upper); if (IS_ERR(upper)) - goto out_dput; + goto out_unlock; - err = ovl_create_real(wdir, newdentry, cattr); - if (err) - goto out_dput2; + newdentry = ovl_create_real(wdir, ovl_lookup_temp(workdir), cattr); + err = PTR_ERR(newdentry); + if (IS_ERR(newdentry)) + goto out_dput; /* * mode could have been mutilated due to umask (e.g. sgid directory) @@ -439,11 +438,9 @@ static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode, goto out_cleanup; } ovl_instantiate(dentry, inode, newdentry, hardlink); - newdentry = NULL; -out_dput2: - dput(upper); + err = 0; out_dput: - dput(newdentry); + dput(upper); out_unlock: unlock_rename(workdir, upperdir); out: @@ -455,7 +452,8 @@ out: out_cleanup: ovl_cleanup(wdir, newdentry); - goto out_dput2; + dput(newdentry); + goto out_dput; } static int ovl_create_or_link(struct dentry *dentry, struct inode *inode, diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h index aa82864..6bbde51 100644 --- a/fs/overlayfs/overlayfs.h +++ b/fs/overlayfs/overlayfs.h @@ -358,8 +358,8 @@ struct ovl_cattr { #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) }) -int ovl_create_real(struct inode *dir, struct dentry *newdentry, - struct ovl_cattr *attr); +struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry, + struct ovl_cattr *attr); int ovl_cleanup(struct inode *dir, struct dentry *dentry); /* copy_up.c */ diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 286d367..704b373 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -611,9 +611,10 @@ retry: goto retry; } - err = ovl_create_real(dir, work, OVL_CATTR(attr.ia_mode)); - if (err) - goto out_dput; + work = ovl_create_real(dir, work, OVL_CATTR(attr.ia_mode)); + err = PTR_ERR(work); + if (IS_ERR(work)) + goto out_err; /* * Try to remove POSIX ACL xattrs from workdir. We are good if: |