From: Theodore Ts'o <tytso@mit.edu>
Date: Mon, 12 Apr 2021 21:19:00 +0000 (-0400)
Subject: ext4: allow the dax flag to be set and cleared on inline directories
X-Git-Tag: x86_urgent_for_v5.13_rc1~33^2~3
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=4811d9929cdae4238baf5b2522247bd2f9fa7b50;p=users%2Fdwmw2%2Flinux.git

ext4: allow the dax flag to be set and cleared on inline directories

This is needed to allow generic/607 to pass for file systems with the
inline data_feature enabled, and it allows the use of file systems
where the directories use inline_data, while the files are accessed
via DAX.

Cc: stable@kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 5f0c7fe326720..71d321b3b9844 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -1292,7 +1292,8 @@ got:
 
 	ei->i_extra_isize = sbi->s_want_extra_isize;
 	ei->i_inline_off = 0;
-	if (ext4_has_feature_inline_data(sb))
+	if (ext4_has_feature_inline_data(sb) &&
+	    (!(ei->i_flags & EXT4_DAX_FL) || S_ISDIR(mode)))
 		ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 	ret = inode;
 	err = dquot_alloc_inode(inode);
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index a2cf35066f46b..0796bfa72829c 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -315,6 +315,12 @@ static void ext4_dax_dontcache(struct inode *inode, unsigned int flags)
 static bool dax_compatible(struct inode *inode, unsigned int oldflags,
 			   unsigned int flags)
 {
+	/* Allow the DAX flag to be changed on inline directories */
+	if (S_ISDIR(inode->i_mode)) {
+		flags &= ~EXT4_INLINE_DATA_FL;
+		oldflags &= ~EXT4_INLINE_DATA_FL;
+	}
+
 	if (flags & EXT4_DAX_FL) {
 		if ((oldflags & EXT4_DAX_MUT_EXCL) ||
 		     ext4_test_inode_state(inode,