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| author | Dan Williams <dan.j.williams@intel.com> | 2017-08-30 09:43:34 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-08-31 09:33:30 -0700 |
| commit | 8cf037a8b22f71c6659bd0246bfaba9e79766f64 (patch) | |
| tree | 29488639a0421bfd6316beb79131630d43039009 /fs/ext2 | |
| parent | 486aff5e04823bb1e60c4045226eb244024b8420 (diff) | |
| download | linux-stable-8cf037a8b22f71c6659bd0246bfaba9e79766f64.tar.gz linux-stable-8cf037a8b22f71c6659bd0246bfaba9e79766f64.tar.bz2 linux-stable-8cf037a8b22f71c6659bd0246bfaba9e79766f64.zip | |
ext2: 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/ext2')
| -rw-r--r-- | fs/ext2/ext2.h | 1 | ||||
| -rw-r--r-- | fs/ext2/inode.c | 11 | ||||
| -rw-r--r-- | fs/ext2/super.c | 4 |
3 files changed, 8 insertions, 8 deletions
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h index 23ebb92484c6..28de3edd4f4d 100644 --- a/fs/ext2/ext2.h +++ b/fs/ext2/ext2.h @@ -114,6 +114,7 @@ struct ext2_sb_info { */ spinlock_t s_lock; struct mb_cache *s_ea_block_cache; + struct dax_device *s_daxdev; }; static inline spinlock_t * diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c index 30163d007b2f..4dca6f348714 100644 --- a/fs/ext2/inode.c +++ b/fs/ext2/inode.c @@ -800,10 +800,10 @@ int ext2_get_block(struct inode *inode, sector_t iblock, static int ext2_iomap_begin(struct inode *inode, loff_t offset, loff_t length, unsigned flags, struct iomap *iomap) { - struct block_device *bdev; unsigned int blkbits = inode->i_blkbits; unsigned long first_block = offset >> blkbits; unsigned long max_blocks = (length + (1 << blkbits) - 1) >> blkbits; + struct ext2_sb_info *sbi = EXT2_SB(inode->i_sb); bool new = false, boundary = false; u32 bno; int ret; @@ -814,13 +814,9 @@ static int ext2_iomap_begin(struct inode *inode, loff_t offset, loff_t length, return ret; iomap->flags = 0; - bdev = inode->i_sb->s_bdev; - iomap->bdev = bdev; + iomap->bdev = inode->i_sb->s_bdev; iomap->offset = (u64)first_block << blkbits; - 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->dax_dev = sbi->s_daxdev; if (ret == 0) { iomap->type = IOMAP_HOLE; @@ -842,7 +838,6 @@ static int ext2_iomap_end(struct inode *inode, loff_t offset, loff_t length, ssize_t written, unsigned flags, struct iomap *iomap) { - fs_put_dax(iomap->dax_dev); if (iomap->type == IOMAP_MAPPED && written < length && (flags & IOMAP_WRITE)) diff --git a/fs/ext2/super.c b/fs/ext2/super.c index 7b1bc9059863..fc18edd81815 100644 --- a/fs/ext2/super.c +++ b/fs/ext2/super.c @@ -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; } |