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block: cache bdev in struct file for raw bdev IO
bdev = &BDEV_I(file->f_mapping->host)->bdev Getting struct block_device from a file requires 2 memory dereferences as illustrated above, that takes a toll on performance, so cache it in yet unused file->private_data. That gives a noticeable peak performance improvement. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/8415f9fe12e544b9da89593dfbca8de2b52efe03.1634115360.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
parent
c712dccc64
commit
fac7c6d529
1 changed files with 12 additions and 15 deletions
27
block/fops.c
27
block/fops.c
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@ -17,7 +17,7 @@
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#include <linux/fs.h>
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#include "blk.h"
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static struct inode *bdev_file_inode(struct file *file)
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static inline struct inode *bdev_file_inode(struct file *file)
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{
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return file->f_mapping->host;
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}
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@ -54,8 +54,7 @@ static void blkdev_bio_end_io_simple(struct bio *bio)
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static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb,
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struct iov_iter *iter, unsigned int nr_pages)
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{
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struct file *file = iocb->ki_filp;
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struct block_device *bdev = I_BDEV(bdev_file_inode(file));
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struct block_device *bdev = iocb->ki_filp->private_data;
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struct bio_vec inline_vecs[DIO_INLINE_BIO_VECS], *vecs;
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loff_t pos = iocb->ki_pos;
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bool should_dirty = false;
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@ -183,9 +182,7 @@ static void blkdev_bio_end_io(struct bio *bio)
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static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
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unsigned int nr_pages)
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{
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struct file *file = iocb->ki_filp;
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struct inode *inode = bdev_file_inode(file);
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struct block_device *bdev = I_BDEV(inode);
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struct block_device *bdev = iocb->ki_filp->private_data;
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struct blk_plug plug;
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struct blkdev_dio *dio;
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struct bio *bio;
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@ -389,8 +386,7 @@ static loff_t blkdev_llseek(struct file *file, loff_t offset, int whence)
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static int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
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int datasync)
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{
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struct inode *bd_inode = bdev_file_inode(filp);
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struct block_device *bdev = I_BDEV(bd_inode);
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struct block_device *bdev = filp->private_data;
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int error;
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error = file_write_and_wait_range(filp, start, end);
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@ -432,6 +428,8 @@ static int blkdev_open(struct inode *inode, struct file *filp)
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bdev = blkdev_get_by_dev(inode->i_rdev, filp->f_mode, filp);
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if (IS_ERR(bdev))
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return PTR_ERR(bdev);
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filp->private_data = bdev;
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filp->f_mapping = bdev->bd_inode->i_mapping;
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filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping);
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return 0;
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@ -439,7 +437,7 @@ static int blkdev_open(struct inode *inode, struct file *filp)
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static int blkdev_close(struct inode *inode, struct file *filp)
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{
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struct block_device *bdev = I_BDEV(bdev_file_inode(filp));
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struct block_device *bdev = filp->private_data;
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blkdev_put(bdev, filp->f_mode);
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return 0;
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@ -454,14 +452,14 @@ static int blkdev_close(struct inode *inode, struct file *filp)
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*/
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static ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
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{
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struct file *file = iocb->ki_filp;
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struct inode *bd_inode = bdev_file_inode(file);
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struct block_device *bdev = iocb->ki_filp->private_data;
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struct inode *bd_inode = bdev->bd_inode;
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loff_t size = i_size_read(bd_inode);
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struct blk_plug plug;
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size_t shorted = 0;
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ssize_t ret;
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if (bdev_read_only(I_BDEV(bd_inode)))
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if (bdev_read_only(bdev))
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return -EPERM;
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if (IS_SWAPFILE(bd_inode) && !is_hibernate_resume_dev(bd_inode->i_rdev))
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@ -493,9 +491,8 @@ static ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
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static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
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{
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struct file *file = iocb->ki_filp;
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struct inode *bd_inode = bdev_file_inode(file);
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loff_t size = i_size_read(bd_inode);
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struct block_device *bdev = iocb->ki_filp->private_data;
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loff_t size = i_size_read(bdev->bd_inode);
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loff_t pos = iocb->ki_pos;
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size_t shorted = 0;
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ssize_t ret;
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