In order to add directory delegation support, we need to break delegations on the parent whenever there is going to be a change in the directory. Add a "delegated_inode" return pointer to vfs_rmdir() and populate that pointer with the parent inode if it's non-NULL. Most existing in-kernel callers pass in a NULL pointer. Reviewed-by: Jan Kara Reviewed-by: NeilBrown Signed-off-by: Jeff Layton --- drivers/base/devtmpfs.c | 2 +- fs/ecryptfs/inode.c | 2 +- fs/namei.c | 22 +++++++++++++++++----- fs/nfsd/nfs4recover.c | 4 ++-- fs/nfsd/vfs.c | 2 +- fs/overlayfs/overlayfs.h | 2 +- fs/smb/server/vfs.c | 4 ++-- include/linux/fs.h | 3 ++- 8 files changed, 27 insertions(+), 14 deletions(-) diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c index 0e79621cb0f79870003b867ca384199171ded4e0..104025104ef75381984fd94dfbd50feeaa8cdd22 100644 --- a/drivers/base/devtmpfs.c +++ b/drivers/base/devtmpfs.c @@ -261,7 +261,7 @@ static int dev_rmdir(const char *name) return PTR_ERR(dentry); if (d_inode(dentry)->i_private == &thread) err = vfs_rmdir(&nop_mnt_idmap, d_inode(parent.dentry), - dentry); + dentry, NULL); else err = -EPERM; diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index 35830b3144f8f71374a78b3e7463b864f4fc216e..88631291b32535f623a3fbe4ea9b6ed48a306ca0 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -540,7 +540,7 @@ static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) if (d_unhashed(lower_dentry)) rc = -EINVAL; else - rc = vfs_rmdir(&nop_mnt_idmap, lower_dir, lower_dentry); + rc = vfs_rmdir(&nop_mnt_idmap, lower_dir, lower_dentry, NULL); } if (!rc) { clear_nlink(d_inode(dentry)); diff --git a/fs/namei.c b/fs/namei.c index 86cf6eca1f485361c6732974e4103cf5ea721539..4b5a99653c558397e592715d9d4663cd4a63ef86 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -4522,9 +4522,10 @@ SYSCALL_DEFINE2(mkdir, const char __user *, pathname, umode_t, mode) /** * vfs_rmdir - remove directory - * @idmap: idmap of the mount the inode was found from - * @dir: inode of the parent directory - * @dentry: dentry of the child directory + * @idmap: idmap of the mount the inode was found from + * @dir: inode of the parent directory + * @dentry: dentry of the child directory + * @delegated_inode: returns parent inode, if it's delegated. * * Remove a directory. * @@ -4535,7 +4536,7 @@ SYSCALL_DEFINE2(mkdir, const char __user *, pathname, umode_t, mode) * raw inode simply pass @nop_mnt_idmap. */ int vfs_rmdir(struct mnt_idmap *idmap, struct inode *dir, - struct dentry *dentry) + struct dentry *dentry, struct inode **delegated_inode) { int error = may_delete(idmap, dir, dentry, 1); @@ -4557,6 +4558,10 @@ int vfs_rmdir(struct mnt_idmap *idmap, struct inode *dir, if (error) goto out; + error = try_break_deleg(dir, delegated_inode); + if (error) + goto out; + error = dir->i_op->rmdir(dir, dentry); if (error) goto out; @@ -4583,6 +4588,7 @@ int do_rmdir(int dfd, struct filename *name) struct qstr last; int type; unsigned int lookup_flags = 0; + struct inode *delegated_inode = NULL; retry: error = filename_parentat(dfd, name, lookup_flags, &path, &last, &type); if (error) @@ -4612,7 +4618,8 @@ int do_rmdir(int dfd, struct filename *name) error = security_path_rmdir(&path, dentry); if (error) goto exit4; - error = vfs_rmdir(mnt_idmap(path.mnt), path.dentry->d_inode, dentry); + error = vfs_rmdir(mnt_idmap(path.mnt), path.dentry->d_inode, + dentry, &delegated_inode); exit4: dput(dentry); exit3: @@ -4620,6 +4627,11 @@ int do_rmdir(int dfd, struct filename *name) mnt_drop_write(path.mnt); exit2: path_put(&path); + if (delegated_inode) { + error = break_deleg_wait(&delegated_inode); + if (!error) + goto retry; + } if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; goto retry; diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c index 423dd102b51198ea7c447be2b9a0a5020c950dba..71f8bf25d209937e13c9ae563101b7d8bf55f4ce 100644 --- a/fs/nfsd/nfs4recover.c +++ b/fs/nfsd/nfs4recover.c @@ -315,7 +315,7 @@ nfsd4_unlink_clid_dir(char *name, struct nfsd_net *nn) status = -ENOENT; if (d_really_is_negative(dentry)) goto out; - status = vfs_rmdir(&nop_mnt_idmap, d_inode(dir), dentry); + status = vfs_rmdir(&nop_mnt_idmap, d_inode(dir), dentry, NULL); out: dput(dentry); out_unlock: @@ -409,7 +409,7 @@ purge_old(struct dentry *parent, char *cname, struct nfsd_net *nn) inode_lock_nested(d_inode(parent), I_MUTEX_PARENT); child = lookup_one(&nop_mnt_idmap, &QSTR(cname), parent); if (!IS_ERR(child)) { - status = vfs_rmdir(&nop_mnt_idmap, d_inode(parent), child); + status = vfs_rmdir(&nop_mnt_idmap, d_inode(parent), child, NULL); if (status) printk("failed to remove client recovery directory %pd\n", child); diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 5f24af289d509bea54a324b8851fa06de6050353..85afd2fad7e08b66b1a9ce372afdea1df52086be 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -2195,7 +2195,7 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, break; } } else { - host_err = vfs_rmdir(&nop_mnt_idmap, dirp, rdentry); + host_err = vfs_rmdir(&nop_mnt_idmap, dirp, rdentry, NULL); } fh_fill_post_attrs(fhp); diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h index 0f65f9a5d54d4786b39e4f4f30f416d5b9016e70..d215d7349489686b66bb66e939b27046f7d836f6 100644 --- a/fs/overlayfs/overlayfs.h +++ b/fs/overlayfs/overlayfs.h @@ -206,7 +206,7 @@ static inline int ovl_do_notify_change(struct ovl_fs *ofs, static inline int ovl_do_rmdir(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry) { - int err = vfs_rmdir(ovl_upper_mnt_idmap(ofs), dir, dentry); + int err = vfs_rmdir(ovl_upper_mnt_idmap(ofs), dir, dentry, NULL); pr_debug("rmdir(%pd2) = %i\n", dentry, err); return err; diff --git a/fs/smb/server/vfs.c b/fs/smb/server/vfs.c index 3d2190f26623b23ea79c63410905a3c3ad684048..c5f0f3170d586cb2dc4d416b80948c642797fb82 100644 --- a/fs/smb/server/vfs.c +++ b/fs/smb/server/vfs.c @@ -609,7 +609,7 @@ int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path) idmap = mnt_idmap(path->mnt); if (S_ISDIR(d_inode(path->dentry)->i_mode)) { - err = vfs_rmdir(idmap, d_inode(parent), path->dentry); + err = vfs_rmdir(idmap, d_inode(parent), path->dentry, NULL); if (err && err != -ENOTEMPTY) ksmbd_debug(VFS, "rmdir failed, err %d\n", err); } else { @@ -1090,7 +1090,7 @@ int ksmbd_vfs_unlink(struct file *filp) dget(dentry); if (S_ISDIR(d_inode(dentry)->i_mode)) - err = vfs_rmdir(idmap, d_inode(dir), dentry); + err = vfs_rmdir(idmap, d_inode(dir), dentry, NULL); else err = vfs_unlink(idmap, d_inode(dir), dentry, NULL); diff --git a/include/linux/fs.h b/include/linux/fs.h index 1040df3792794cd353b86558b41618294e25b8a6..d8bdaf7c87502ff17775602f5391d375738b4ed8 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2120,7 +2120,8 @@ int vfs_symlink(struct mnt_idmap *, struct inode *, struct dentry *, const char *); int vfs_link(struct dentry *, struct mnt_idmap *, struct inode *, struct dentry *, struct inode **); -int vfs_rmdir(struct mnt_idmap *, struct inode *, struct dentry *); +int vfs_rmdir(struct mnt_idmap *, struct inode *, struct dentry *, + struct inode **); int vfs_unlink(struct mnt_idmap *, struct inode *, struct dentry *, struct inode **); -- 2.51.0