fs/ext4: Update ext4_should_use_dax()

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S_DAX should only be enabled when the underlying block device supports
dax.

Cache the underlying support for DAX in the super block and modify
ext4_should_use_dax() to check for device support prior to the over
riding mount option.

While we are at it change the function to ext4_should_enable_dax() as
this better reflects the ask as well as matches xfs.

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

Link: https://lore.kernel.org/r/20200528150003.828793-5-ira.weiny@intel.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

...

This commit is contained in:

Ira Weiny 2020-05-28 07:59:58 -07:00 • committed by Theodore Ts'o

parent fc626fe322

commit a8ab6d3885

3 changed files with 15 additions and 6 deletions

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1

fs/ext4/ext4.h

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15

fs/ext4/inode.c

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5

fs/ext4/super.c

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