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| author | Dan Williams <dan.j.williams@intel.com> | 2017-08-25 01:42:48 +0200 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-08-31 20:12:13 +0200 |
| commit | 5e405595e5bf4c09fab9ca1e7dbe5b62872757b5 (patch) | |
| tree | d26852e38cf6c07551d0f42f1e03435e75067583 /fs/ext4/inode.c | |
| parent | ext2: perform dax_device lookup at mount (diff) | |
| download | linux-5e405595e5bf4c09fab9ca1e7dbe5b62872757b5.tar.xz linux-5e405595e5bf4c09fab9ca1e7dbe5b62872757b5.zip | |
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/inode.c')
| -rw-r--r-- | fs/ext4/inode.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index c774bdc22759..16424b5c4e88 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -3404,7 +3404,7 @@ static int ext4_releasepage(struct page *page, gfp_t wait) static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length, unsigned flags, struct iomap *iomap) { - struct block_device *bdev; + struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); unsigned int blkbits = inode->i_blkbits; unsigned long first_block = offset >> blkbits; unsigned long last_block = (offset + length - 1) >> blkbits; @@ -3473,12 +3473,8 @@ retry: } iomap->flags = 0; - bdev = inode->i_sb->s_bdev; - iomap->bdev = bdev; - if (blk_queue_dax(bdev->bd_queue)) - iomap->dax_dev = fs_dax_get_by_host(bdev->bd_disk->disk_name); - else - iomap->dax_dev = NULL; + iomap->bdev = inode->i_sb->s_bdev; + iomap->dax_dev = sbi->s_daxdev; iomap->offset = first_block << blkbits; if (ret == 0) { @@ -3511,7 +3507,6 @@ static int ext4_iomap_end(struct inode *inode, loff_t offset, loff_t length, int blkbits = inode->i_blkbits; bool truncate = false; - fs_put_dax(iomap->dax_dev); if (!(flags & IOMAP_WRITE) || (flags & IOMAP_FAULT)) return 0; |