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>

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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/ext4.h

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2

fs/ext4/inode.c

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67

fs/ext4/super.c

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