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| author | Miklos Szeredi <mszeredi@redhat.com> | 2016-12-16 11:02:55 +0100 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2016-12-16 11:02:55 +0100 |
| commit | 370e55ace59c2d3ed8f0ca933155030b9652e04f (patch) | |
| tree | 3cef98f251aee75f32615945ff012bc8bb22fc0a /fs/overlayfs/dir.c | |
| parent | 38e813db61c3951ef76d071ca7d2f46c2e939b80 (diff) | |
| download | lwn-370e55ace59c2d3ed8f0ca933155030b9652e04f.tar.gz lwn-370e55ace59c2d3ed8f0ca933155030b9652e04f.zip | |
ovl: rename: simplify handling of lower/merged directory
d_is_dir() is safe to call on a negative dentry. Use this fact to simplify
handling of the lower or merged directories.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/dir.c')
| -rw-r--r-- | fs/overlayfs/dir.c | 30 |
1 files changed, 12 insertions, 18 deletions
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c index 76b1edccbedd..69c3971a9992 100644 --- a/fs/overlayfs/dir.c +++ b/fs/overlayfs/dir.c @@ -761,13 +761,18 @@ static int ovl_rmdir(struct inode *dir, struct dentry *dentry) return ovl_do_remove(dentry, true); } +static bool ovl_type_merge_or_lower(struct dentry *dentry) +{ + enum ovl_path_type type = ovl_path_type(dentry); + + return OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type); +} + static int ovl_rename(struct inode *olddir, struct dentry *old, struct inode *newdir, struct dentry *new, unsigned int flags) { int err; - enum ovl_path_type old_type; - enum ovl_path_type new_type; struct dentry *old_upperdir; struct dentry *new_upperdir; struct dentry *olddentry; @@ -778,7 +783,7 @@ static int ovl_rename(struct inode *olddir, struct dentry *old, bool cleanup_whiteout = false; bool overwrite = !(flags & RENAME_EXCHANGE); bool is_dir = d_is_dir(old); - bool new_is_dir = false; + bool new_is_dir = d_is_dir(new); struct dentry *opaquedir = NULL; const struct cred *old_cred = NULL; @@ -789,22 +794,11 @@ static int ovl_rename(struct inode *olddir, struct dentry *old, flags &= ~RENAME_NOREPLACE; /* Don't copy up directory trees */ - old_type = ovl_path_type(old); err = -EXDEV; - if (OVL_TYPE_MERGE_OR_LOWER(old_type) && is_dir) + if (is_dir && ovl_type_merge_or_lower(old)) + goto out; + if (!overwrite && new_is_dir && ovl_type_merge_or_lower(new)) goto out; - - if (new->d_inode) { - if (d_is_dir(new)) - new_is_dir = true; - - new_type = ovl_path_type(new); - err = -EXDEV; - if (!overwrite && OVL_TYPE_MERGE_OR_LOWER(new_type) && new_is_dir) - goto out; - } else { - new_type = __OVL_PATH_UPPER; - } err = ovl_want_write(old); if (err) @@ -828,7 +822,7 @@ static int ovl_rename(struct inode *olddir, struct dentry *old, old_cred = ovl_override_creds(old->d_sb); - if (overwrite && OVL_TYPE_MERGE_OR_LOWER(new_type) && new_is_dir) { + if (overwrite && new_is_dir && ovl_type_merge_or_lower(new)) { opaquedir = ovl_check_empty_and_clear(new); err = PTR_ERR(opaquedir); if (IS_ERR(opaquedir)) { |