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ext4: add ext4_should_use_dax() 

This helper, in the spirit of ext4_should_dioread_nolock() et al., replaces
the complex conditional in ext4_set_inode_flags().

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Ross Zwisler 2017-10-12 12:00:59 -04:00 committed by Theodore Ts'o
parent 7d3e06a8da
commit 6642586b3e
1 changed files with 16 additions and 3 deletions
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19
fs/ext4/inode.c
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@ -4610,6 +4610,21 @@ int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc)
!ext4_test_inode_state(inode, EXT4_STATE_XATTR));
}
static bool ext4_should_use_dax(struct inode *inode)
{
if (!test_opt(inode->i_sb, DAX))
return false;
if (!S_ISREG(inode->i_mode))
return false;
if (ext4_should_journal_data(inode))
return false;
if (ext4_has_inline_data(inode))
return false;
if (ext4_encrypted_inode(inode))
return false;
return true;
}
void ext4_set_inode_flags(struct inode *inode)
{
unsigned int flags = EXT4_I(inode)->i_flags;
@ -4625,9 +4640,7 @@ void ext4_set_inode_flags(struct inode *inode)
new_fl |= S_NOATIME;
if (flags & EXT4_DIRSYNC_FL)
new_fl |= S_DIRSYNC;
if (test_opt(inode->i_sb, DAX) && S_ISREG(inode->i_mode) &&
!ext4_should_journal_data(inode) && !ext4_has_inline_data(inode) &&
!ext4_encrypted_inode(inode))
if (ext4_should_use_dax(inode))
new_fl |= S_DAX;
inode_set_flags(inode, new_fl,
S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_DAX);