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authorDan Williams <dan.j.williams@intel.com>2017-08-25 02:42:48 +0300
committerDan Williams <dan.j.williams@intel.com>2017-08-31 21:12:13 +0300
commit5e405595e5bf4c09fab9ca1e7dbe5b62872757b5 (patch)
treed26852e38cf6c07551d0f42f1e03435e75067583 /fs/ext4/ext4.h
parent8cf037a8b22f71c6659bd0246bfaba9e79766f64 (diff)
downloadlinux-5e405595e5bf4c09fab9ca1e7dbe5b62872757b5.tar.xz
ext4: perform dax_device lookup at mount
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>
Diffstat (limited to 'fs/ext4/ext4.h')
-rw-r--r--fs/ext4/ext4.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index a2bb7d2870e4..194e622dc3dd 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1528,6 +1528,7 @@ struct ext4_sb_info {
/* Barrier between changing inodes' journal flags and writepages ops. */
struct percpu_rw_semaphore s_journal_flag_rwsem;
+ struct dax_device *s_daxdev;
};
static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)