| Message ID | 150389212595.25151.10721705529768874001.stgit@dwillia2-desk3.amr.corp.intel.com |
|---|---|
| State | New, archived |
| Headers | show |
| Series | fs, dax: lookup dax_device at mount time | expand |
On Sun 27-08-17 20:48:46, Dan Williams wrote: > The ->iomap_begin() operation is a hot path, and now that mount_bdev() > arranges for the dax_device to be populated in the super_block, we can > just reference that attribute directly rather than perform a new lookup. > > Cc: Jan Kara <jack@suse.com> > Cc: "Theodore Ts'o" <tytso@mit.edu> > Cc: Andreas Dilger <adilger.kernel@dilger.ca> > Reported-by: Christoph Hellwig <hch@lst.de> > Signed-off-by: Dan Williams <dan.j.williams@intel.com> Looks good. You can add: Reviewed-by: Jan Kara <jack@suse.cz> Honza > --- > fs/ext2/inode.c | 10 ++-------- > fs/ext4/inode.c | 10 ++-------- > 2 files changed, 4 insertions(+), 16 deletions(-) > > diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c > index 30163d007b2f..7102b77a83c6 100644 > --- a/fs/ext2/inode.c > +++ b/fs/ext2/inode.c > @@ -800,7 +800,6 @@ 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; > @@ -814,13 +813,9 @@ 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 = inode->i_sb->s_daxdev; > > if (ret == 0) { > iomap->type = IOMAP_HOLE; > @@ -842,7 +837,6 @@ 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/ext4/inode.c b/fs/ext4/inode.c > index c774bdc22759..311690522366 100644 > --- a/fs/ext4/inode.c > +++ b/fs/ext4/inode.c > @@ -3404,7 +3404,6 @@ 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; > unsigned int blkbits = inode->i_blkbits; > unsigned long first_block = offset >> blkbits; > unsigned long last_block = (offset + length - 1) >> blkbits; > @@ -3473,12 +3472,8 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length, > } > > 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 = inode->i_sb->s_daxdev; > iomap->offset = first_block << blkbits; > > if (ret == 0) { > @@ -3511,7 +3506,6 @@ 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; > >
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c index 30163d007b2f..7102b77a83c6 100644 --- a/fs/ext2/inode.c +++ b/fs/ext2/inode.c @@ -800,7 +800,6 @@ 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; @@ -814,13 +813,9 @@ 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 = inode->i_sb->s_daxdev; if (ret == 0) { iomap->type = IOMAP_HOLE; @@ -842,7 +837,6 @@ 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/ext4/inode.c b/fs/ext4/inode.c index c774bdc22759..311690522366 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -3404,7 +3404,6 @@ 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; unsigned int blkbits = inode->i_blkbits; unsigned long first_block = offset >> blkbits; unsigned long last_block = (offset + length - 1) >> blkbits; @@ -3473,12 +3472,8 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length, } 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 = inode->i_sb->s_daxdev; iomap->offset = first_block << blkbits; if (ret == 0) { @@ -3511,7 +3506,6 @@ 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;
The ->iomap_begin() operation is a hot path, and now that mount_bdev() arranges for the dax_device to be populated in the super_block, we can just reference that attribute directly rather than perform a new lookup. Cc: Jan Kara <jack@suse.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com> --- fs/ext2/inode.c | 10 ++-------- fs/ext4/inode.c | 10 ++-------- 2 files changed, 4 insertions(+), 16 deletions(-)