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fs/ext4: Make DAX mount option a tri-state

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We add 'always', 'never', and 'inode' (default).  '-o dax' continues to
operate the same which is equivalent to 'always'.  This new
functionality is limited to ext4 only.

Specifically we introduce a 2nd DAX mount flag EXT4_MOUNT2_DAX_NEVER and set
it and EXT4_MOUNT_DAX_ALWAYS appropriately for the mode.

We also force EXT4_MOUNT2_DAX_NEVER if !CONFIG_FS_DAX.

Finally, EXT4_MOUNT2_DAX_INODE is used solely to detect if the user
specified that option for printing.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>

Link: https://lore.kernel.org/r/20200528150003.828793-7-ira.weiny@intel.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Ira Weiny 2020-05-28 08:00:00 -07:00 • committed by Theodore Ts'o
parent 043546e46d
commit 9cb20f94af
3 changed files with 61 additions and 10 deletions
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2
fs/ext4/inode.c
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@ -4402,6 +4402,8 @@ static bool ext4_should_enable_dax(struct inode *inode)
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
if (test_opt2(inode->i_sb, DAX_NEVER))
return false;
if (!S_ISREG(inode->i_mode))
return false;
if (ext4_should_journal_data(inode))