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

commit 4811d9929cdae4238baf5b2522247bd2f9fa7b50 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index a7ef18a..c92558e 100644 (file)
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -1291,7 +1291,8 @@ 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 106bf14..cb54ea6 100644 (file)
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -312,6 +312,12 @@ 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,