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ext2: perform dax_device lookup at mount

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The ->iomap_begin() operation is a hot path, so cache the
fs_dax_get_by_host() result at mount time to avoid the incurring the
hash lookup overhead on a per-i/o basis.

Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Reviewed-by: Jan Kara <jack@suse.cz>
Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2017-08-30 09:43:34 -07:00
parent 486aff5e04
commit 8cf037a8b2
3 changed files with 8 additions and 8 deletions
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4
fs/ext2/super.c
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@@ -171,6 +171,7 @@ static void ext2_put_super (struct super_block * sb)
brelse (sbi->s_sbh);
sb->s_fs_info = NULL;
kfree(sbi->s_blockgroup_lock);
fs_put_dax(sbi->s_daxdev);
kfree(sbi);
}
@@ -813,6 +814,7 @@ static unsigned long descriptor_loc(struct super_block *sb,
static int ext2_fill_super(struct super_block *sb, void *data, int silent)
{
struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
struct buffer_head * bh;
struct ext2_sb_info * sbi;
struct ext2_super_block * es;
@@ -842,6 +844,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
}
sb->s_fs_info = sbi;
sbi->s_sb_block = sb_block;
sbi->s_daxdev = dax_dev;
spin_lock_init(&sbi->s_lock);
@@ -1200,6 +1203,7 @@ failed_sbi:
kfree(sbi->s_blockgroup_lock);
kfree(sbi);
failed:
fs_put_dax(dax_dev);
return ret;
}