--- /dev/null
+From 1e2e547a93a00ebc21582c06ca3c6cfea2a309ee Mon Sep 17 00:00:00 2001
+From: Al Viro <viro@zeniv.linux.org.uk>
+Date: Fri, 4 May 2018 08:23:01 -0400
+Subject: do d_instantiate/unlock_new_inode combinations safely
+
+From: Al Viro <viro@zeniv.linux.org.uk>
+
+commit 1e2e547a93a00ebc21582c06ca3c6cfea2a309ee upstream.
+
+For anything NFS-exported we do _not_ want to unlock new inode
+before it has grown an alias; original set of fixes got the
+ordering right, but missed the nasty complication in case of
+lockdep being enabled - unlock_new_inode() does
+ lockdep_annotate_inode_mutex_key(inode)
+which can only be done before anyone gets a chance to touch
+->i_mutex. Unfortunately, flipping the order and doing
+unlock_new_inode() before d_instantiate() opens a window when
+mkdir can race with open-by-fhandle on a guessed fhandle, leading
+to multiple aliases for a directory inode and all the breakage
+that follows from that.
+
+ Correct solution: a new primitive (d_instantiate_new())
+combining these two in the right order - lockdep annotate, then
+d_instantiate(), then the rest of unlock_new_inode(). All
+combinations of d_instantiate() with unlock_new_inode() should
+be converted to that.
+
+Cc: stable@kernel.org # 2.6.29 and later
+Tested-by: Mike Marshall <hubcap@omnibond.com>
+Reviewed-by: Andreas Dilger <adilger@dilger.ca>
+Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
+index e064c49c9a9a..9e97cbb4f006 100644
+--- a/fs/btrfs/inode.c
++++ b/fs/btrfs/inode.c
+@@ -6575,8 +6575,7 @@ static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
+ goto out_unlock_inode;
+ } else {
+ btrfs_update_inode(trans, root, inode);
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ }
+
+ out_unlock:
+@@ -6652,8 +6651,7 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
+ goto out_unlock_inode;
+
+ BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+
+ out_unlock:
+ btrfs_end_transaction(trans);
+@@ -6798,12 +6796,7 @@ static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+ if (err)
+ goto out_fail_inode;
+
+- d_instantiate(dentry, inode);
+- /*
+- * mkdir is special. We're unlocking after we call d_instantiate
+- * to avoid a race with nfsd calling d_instantiate.
+- */
+- unlock_new_inode(inode);
++ d_instantiate_new(dentry, inode);
+ drop_on_err = 0;
+
+ out_fail:
+@@ -10246,8 +10239,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
+ goto out_unlock_inode;
+ }
+
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+
+ out_unlock:
+ btrfs_end_transaction(trans);
+diff --git a/fs/dcache.c b/fs/dcache.c
+index 86d2de63461e..2acfc69878f5 100644
+--- a/fs/dcache.c
++++ b/fs/dcache.c
+@@ -1899,6 +1899,28 @@ void d_instantiate(struct dentry *entry, struct inode * inode)
+ }
+ EXPORT_SYMBOL(d_instantiate);
+
++/*
++ * This should be equivalent to d_instantiate() + unlock_new_inode(),
++ * with lockdep-related part of unlock_new_inode() done before
++ * anything else. Use that instead of open-coding d_instantiate()/
++ * unlock_new_inode() combinations.
++ */
++void d_instantiate_new(struct dentry *entry, struct inode *inode)
++{
++ BUG_ON(!hlist_unhashed(&entry->d_u.d_alias));
++ BUG_ON(!inode);
++ lockdep_annotate_inode_mutex_key(inode);
++ security_d_instantiate(entry, inode);
++ spin_lock(&inode->i_lock);
++ __d_instantiate(entry, inode);
++ WARN_ON(!(inode->i_state & I_NEW));
++ inode->i_state &= ~I_NEW;
++ smp_mb();
++ wake_up_bit(&inode->i_state, __I_NEW);
++ spin_unlock(&inode->i_lock);
++}
++EXPORT_SYMBOL(d_instantiate_new);
++
+ /**
+ * d_instantiate_no_diralias - instantiate a non-aliased dentry
+ * @entry: dentry to complete
+diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
+index 847904aa63a9..7bba8f2693b2 100644
+--- a/fs/ecryptfs/inode.c
++++ b/fs/ecryptfs/inode.c
+@@ -283,8 +283,7 @@ ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
+ iget_failed(ecryptfs_inode);
+ goto out;
+ }
+- unlock_new_inode(ecryptfs_inode);
+- d_instantiate(ecryptfs_dentry, ecryptfs_inode);
++ d_instantiate_new(ecryptfs_dentry, ecryptfs_inode);
+ out:
+ return rc;
+ }
+diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
+index 55f7caadb093..152453a91877 100644
+--- a/fs/ext2/namei.c
++++ b/fs/ext2/namei.c
+@@ -41,8 +41,7 @@ static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
+ {
+ int err = ext2_add_link(dentry, inode);
+ if (!err) {
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ return 0;
+ }
+ inode_dec_link_count(inode);
+@@ -255,8 +254,7 @@ static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
+ if (err)
+ goto out_fail;
+
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ out:
+ return err;
+
+diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
+index b1f21e3a0763..4a09063ce1d2 100644
+--- a/fs/ext4/namei.c
++++ b/fs/ext4/namei.c
+@@ -2411,8 +2411,7 @@ static int ext4_add_nondir(handle_t *handle,
+ int err = ext4_add_entry(handle, dentry, inode);
+ if (!err) {
+ ext4_mark_inode_dirty(handle, inode);
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ return 0;
+ }
+ drop_nlink(inode);
+@@ -2651,8 +2650,7 @@ static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+ err = ext4_mark_inode_dirty(handle, dir);
+ if (err)
+ goto out_clear_inode;
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ if (IS_DIRSYNC(dir))
+ ext4_handle_sync(handle);
+
+diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
+index d5098efe577c..75e37fd720b2 100644
+--- a/fs/f2fs/namei.c
++++ b/fs/f2fs/namei.c
+@@ -294,8 +294,7 @@ static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+
+ alloc_nid_done(sbi, ino);
+
+- d_instantiate(dentry, inode);
+- unlock_new_inode(inode);
++ d_instantiate_new(dentry, inode);
+
+ if (IS_DIRSYNC(dir))
+ f2fs_sync_fs(sbi->sb, 1);
+@@ -597,8 +596,7 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
+ err = page_symlink(inode, disk_link.name, disk_link.len);
+
+ err_out:
+- d_instantiate(dentry, inode);
+- unlock_new_inode(inode);
++ d_instantiate_new(dentry, inode);
+
+ /*
+ * Let's flush symlink data in order to avoid broken symlink as much as
+@@ -661,8 +659,7 @@ static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+
+ alloc_nid_done(sbi, inode->i_ino);
+
+- d_instantiate(dentry, inode);
+- unlock_new_inode(inode);
++ d_instantiate_new(dentry, inode);
+
+ if (IS_DIRSYNC(dir))
+ f2fs_sync_fs(sbi->sb, 1);
+@@ -713,8 +710,7 @@ static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
+
+ alloc_nid_done(sbi, inode->i_ino);
+
+- d_instantiate(dentry, inode);
+- unlock_new_inode(inode);
++ d_instantiate_new(dentry, inode);
+
+ if (IS_DIRSYNC(dir))
+ f2fs_sync_fs(sbi->sb, 1);
+diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
+index 0a754f38462e..e5a6deb38e1e 100644
+--- a/fs/jffs2/dir.c
++++ b/fs/jffs2/dir.c
+@@ -209,8 +209,7 @@ static int jffs2_create(struct inode *dir_i, struct dentry *dentry,
+ __func__, inode->i_ino, inode->i_mode, inode->i_nlink,
+ f->inocache->pino_nlink, inode->i_mapping->nrpages);
+
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ return 0;
+
+ fail:
+@@ -430,8 +429,7 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
+ mutex_unlock(&dir_f->sem);
+ jffs2_complete_reservation(c);
+
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ return 0;
+
+ fail:
+@@ -575,8 +573,7 @@ static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode
+ mutex_unlock(&dir_f->sem);
+ jffs2_complete_reservation(c);
+
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ return 0;
+
+ fail:
+@@ -747,8 +744,7 @@ static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode
+ mutex_unlock(&dir_f->sem);
+ jffs2_complete_reservation(c);
+
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ return 0;
+
+ fail:
+diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
+index b41596d71858..56c3fcbfe80e 100644
+--- a/fs/jfs/namei.c
++++ b/fs/jfs/namei.c
+@@ -178,8 +178,7 @@ static int jfs_create(struct inode *dip, struct dentry *dentry, umode_t mode,
+ unlock_new_inode(ip);
+ iput(ip);
+ } else {
+- unlock_new_inode(ip);
+- d_instantiate(dentry, ip);
++ d_instantiate_new(dentry, ip);
+ }
+
+ out2:
+@@ -313,8 +312,7 @@ static int jfs_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode)
+ unlock_new_inode(ip);
+ iput(ip);
+ } else {
+- unlock_new_inode(ip);
+- d_instantiate(dentry, ip);
++ d_instantiate_new(dentry, ip);
+ }
+
+ out2:
+@@ -1059,8 +1057,7 @@ static int jfs_symlink(struct inode *dip, struct dentry *dentry,
+ unlock_new_inode(ip);
+ iput(ip);
+ } else {
+- unlock_new_inode(ip);
+- d_instantiate(dentry, ip);
++ d_instantiate_new(dentry, ip);
+ }
+
+ out2:
+@@ -1447,8 +1444,7 @@ static int jfs_mknod(struct inode *dir, struct dentry *dentry,
+ unlock_new_inode(ip);
+ iput(ip);
+ } else {
+- unlock_new_inode(ip);
+- d_instantiate(dentry, ip);
++ d_instantiate_new(dentry, ip);
+ }
+
+ out1:
+diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c
+index 1a2894aa0194..dd52d3f82e8d 100644
+--- a/fs/nilfs2/namei.c
++++ b/fs/nilfs2/namei.c
+@@ -46,8 +46,7 @@ static inline int nilfs_add_nondir(struct dentry *dentry, struct inode *inode)
+ int err = nilfs_add_link(dentry, inode);
+
+ if (!err) {
+- d_instantiate(dentry, inode);
+- unlock_new_inode(inode);
++ d_instantiate_new(dentry, inode);
+ return 0;
+ }
+ inode_dec_link_count(inode);
+@@ -243,8 +242,7 @@ static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+ goto out_fail;
+
+ nilfs_mark_inode_dirty(inode);
+- d_instantiate(dentry, inode);
+- unlock_new_inode(inode);
++ d_instantiate_new(dentry, inode);
+ out:
+ if (!err)
+ err = nilfs_transaction_commit(dir->i_sb);
+diff --git a/fs/orangefs/namei.c b/fs/orangefs/namei.c
+index 6e3134e6d98a..1b5707c44c3f 100644
+--- a/fs/orangefs/namei.c
++++ b/fs/orangefs/namei.c
+@@ -75,8 +75,7 @@ static int orangefs_create(struct inode *dir,
+ get_khandle_from_ino(inode),
+ dentry);
+
+- d_instantiate(dentry, inode);
+- unlock_new_inode(inode);
++ d_instantiate_new(dentry, inode);
+ orangefs_set_timeout(dentry);
+ ORANGEFS_I(inode)->getattr_time = jiffies - 1;
+ ORANGEFS_I(inode)->getattr_mask = STATX_BASIC_STATS;
+@@ -332,8 +331,7 @@ static int orangefs_symlink(struct inode *dir,
+ "Assigned symlink inode new number of %pU\n",
+ get_khandle_from_ino(inode));
+
+- d_instantiate(dentry, inode);
+- unlock_new_inode(inode);
++ d_instantiate_new(dentry, inode);
+ orangefs_set_timeout(dentry);
+ ORANGEFS_I(inode)->getattr_time = jiffies - 1;
+ ORANGEFS_I(inode)->getattr_mask = STATX_BASIC_STATS;
+@@ -402,8 +400,7 @@ static int orangefs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode
+ "Assigned dir inode new number of %pU\n",
+ get_khandle_from_ino(inode));
+
+- d_instantiate(dentry, inode);
+- unlock_new_inode(inode);
++ d_instantiate_new(dentry, inode);
+ orangefs_set_timeout(dentry);
+ ORANGEFS_I(inode)->getattr_time = jiffies - 1;
+ ORANGEFS_I(inode)->getattr_mask = STATX_BASIC_STATS;
+diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c
+index bd39a998843d..5089dac02660 100644
+--- a/fs/reiserfs/namei.c
++++ b/fs/reiserfs/namei.c
+@@ -687,8 +687,7 @@ static int reiserfs_create(struct inode *dir, struct dentry *dentry, umode_t mod
+ reiserfs_update_inode_transaction(inode);
+ reiserfs_update_inode_transaction(dir);
+
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ retval = journal_end(&th);
+
+ out_failed:
+@@ -771,8 +770,7 @@ static int reiserfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode
+ goto out_failed;
+ }
+
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ retval = journal_end(&th);
+
+ out_failed:
+@@ -871,8 +869,7 @@ static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode
+ /* the above add_entry did not update dir's stat data */
+ reiserfs_update_sd(&th, dir);
+
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ retval = journal_end(&th);
+ out_failed:
+ reiserfs_write_unlock(dir->i_sb);
+@@ -1187,8 +1184,7 @@ static int reiserfs_symlink(struct inode *parent_dir,
+ goto out_failed;
+ }
+
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ retval = journal_end(&th);
+ out_failed:
+ reiserfs_write_unlock(parent_dir->i_sb);
+diff --git a/fs/udf/namei.c b/fs/udf/namei.c
+index 0458dd47e105..c586026508db 100644
+--- a/fs/udf/namei.c
++++ b/fs/udf/namei.c
+@@ -622,8 +622,7 @@ static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
+ if (fibh.sbh != fibh.ebh)
+ brelse(fibh.ebh);
+ brelse(fibh.sbh);
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+
+ return 0;
+ }
+@@ -733,8 +732,7 @@ static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+ inc_nlink(dir);
+ dir->i_ctime = dir->i_mtime = current_time(dir);
+ mark_inode_dirty(dir);
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ if (fibh.sbh != fibh.ebh)
+ brelse(fibh.ebh);
+ brelse(fibh.sbh);
+diff --git a/fs/ufs/namei.c b/fs/ufs/namei.c
+index 32545cd00ceb..d5f43ba76c59 100644
+--- a/fs/ufs/namei.c
++++ b/fs/ufs/namei.c
+@@ -39,8 +39,7 @@ static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode)
+ {
+ int err = ufs_add_link(dentry, inode);
+ if (!err) {
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ return 0;
+ }
+ inode_dec_link_count(inode);
+@@ -193,8 +192,7 @@ static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
+ if (err)
+ goto out_fail;
+
+- unlock_new_inode(inode);
+- d_instantiate(dentry, inode);
++ d_instantiate_new(dentry, inode);
+ return 0;
+
+ out_fail:
+diff --git a/include/linux/dcache.h b/include/linux/dcache.h
+index 94acbde17bb1..66c6e17e61e5 100644
+--- a/include/linux/dcache.h
++++ b/include/linux/dcache.h
+@@ -224,6 +224,7 @@ extern seqlock_t rename_lock;
+ * These are the low-level FS interfaces to the dcache..
+ */
+ extern void d_instantiate(struct dentry *, struct inode *);
++extern void d_instantiate_new(struct dentry *, struct inode *);
+ extern struct dentry * d_instantiate_unique(struct dentry *, struct inode *);
+ extern struct dentry * d_instantiate_anon(struct dentry *, struct inode *);
+ extern int d_instantiate_no_diralias(struct dentry *, struct inode *);
projects / thirdparty / kernel / stable-queue.git / commitdiff
