forked from luck/tmp_suning_uos_patched
btrfs: switch to iomap_dio_rw() for dio
Switch from __blockdev_direct_IO() to iomap_dio_rw(). Rename btrfs_get_blocks_direct() to btrfs_dio_iomap_begin() and use it as iomap_begin() for iomap direct I/O functions. This function allocates and locks all the blocks required for the I/O. btrfs_submit_direct() is used as the submit_io() hook for direct I/O ops. Since we need direct I/O reads to go through iomap_dio_rw(), we change file_operations.read_iter() to a btrfs_file_read_iter() which calls btrfs_direct_IO() for direct reads and falls back to generic_file_buffered_read() for incomplete reads and buffered reads. We don't need address_space.direct_IO() anymore so set it to noop. Similarly, we don't need flags used in __blockdev_direct_IO(). iomap is capable of direct I/O reads from a hole, so we don't need to return -ENOENT. BTRFS direct I/O is now done under i_rwsem, shared in case of reads and exclusive in case of writes. This guards against simultaneous truncates. Use iomap->iomap_end() to check for failed or incomplete direct I/O: - for writes, call __endio_write_update_ordered() - for reads, unlock extents btrfs_dio_data is now hooked in iomap->private and not current->journal_info. It carries the reservation variable and the amount of data submitted, so we can calculate the amount of data to call __endio_write_update_ordered in case of an error. This patch removes last use of struct buffer_head from btrfs. Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Goldwyn Rodrigues
David Sterba
parent
3ad99bec6e
commit
a43a67a2d7
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@ -14,6 +14,7 @@ config BTRFS_FS
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select LZO_DECOMPRESS
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select ZSTD_COMPRESS
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select ZSTD_DECOMPRESS
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select FS_IOMAP
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select RAID6_PQ
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select XOR_BLOCKS
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select SRCU
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@ -2933,6 +2933,7 @@ int btrfs_writepage_cow_fixup(struct page *page, u64 start, u64 end);
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void btrfs_writepage_endio_finish_ordered(struct page *page, u64 start,
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u64 end, int uptodate);
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extern const struct dentry_operations btrfs_dentry_operations;
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ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter);
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/* ioctl.c */
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long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
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@ -1819,7 +1819,7 @@ static ssize_t __btrfs_direct_write(struct kiocb *iocb, struct iov_iter *from)
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loff_t endbyte;
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int err;
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written = generic_file_direct_write(iocb, from);
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written = btrfs_direct_IO(iocb, from);
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if (written < 0 || !iov_iter_count(from))
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return written;
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@ -3476,9 +3476,26 @@ static int btrfs_file_open(struct inode *inode, struct file *filp)
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return generic_file_open(inode, filp);
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}
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static ssize_t btrfs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
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{
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ssize_t ret = 0;
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if (iocb->ki_flags & IOCB_DIRECT) {
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struct inode *inode = file_inode(iocb->ki_filp);
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inode_lock_shared(inode);
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ret = btrfs_direct_IO(iocb, to);
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inode_unlock_shared(inode);
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if (ret < 0)
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return ret;
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}
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return generic_file_buffered_read(iocb, to, ret);
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}
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const struct file_operations btrfs_file_operations = {
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.llseek = btrfs_file_llseek,
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.read_iter = generic_file_read_iter,
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.read_iter = btrfs_file_read_iter,
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.splice_read = generic_file_splice_read,
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.write_iter = btrfs_file_write_iter,
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.mmap = btrfs_file_mmap,
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302
fs/btrfs/inode.c
302
fs/btrfs/inode.c
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@ -5,7 +5,6 @@
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#include <linux/kernel.h>
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#include <linux/bio.h>
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#include <linux/buffer_head.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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@ -30,6 +29,7 @@
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#include <linux/swap.h>
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#include <linux/migrate.h>
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#include <linux/sched/mm.h>
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#include <linux/iomap.h>
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#include <asm/unaligned.h>
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#include "misc.h"
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#include "ctree.h"
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@ -57,9 +57,9 @@ struct btrfs_iget_args {
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struct btrfs_dio_data {
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u64 reserve;
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u64 unsubmitted_oe_range_start;
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u64 unsubmitted_oe_range_end;
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int overwrite;
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loff_t length;
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ssize_t submitted;
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struct extent_changeset *data_reserved;
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};
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static const struct inode_operations btrfs_dir_inode_operations;
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@ -6984,7 +6984,7 @@ noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
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}
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static int lock_extent_direct(struct inode *inode, u64 lockstart, u64 lockend,
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struct extent_state **cached_state, int writing)
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struct extent_state **cached_state, bool writing)
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{
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struct btrfs_ordered_extent *ordered;
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int ret = 0;
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@ -7122,30 +7122,7 @@ static struct extent_map *create_io_em(struct inode *inode, u64 start, u64 len,
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}
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static int btrfs_get_blocks_direct_read(struct extent_map *em,
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struct buffer_head *bh_result,
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struct inode *inode,
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u64 start, u64 len)
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{
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struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
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if (em->block_start == EXTENT_MAP_HOLE ||
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test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
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return -ENOENT;
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len = min(len, em->len - (start - em->start));
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bh_result->b_blocknr = (em->block_start + (start - em->start)) >>
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inode->i_blkbits;
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bh_result->b_size = len;
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bh_result->b_bdev = fs_info->fs_devices->latest_bdev;
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set_buffer_mapped(bh_result);
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return 0;
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}
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static int btrfs_get_blocks_direct_write(struct extent_map **map,
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struct buffer_head *bh_result,
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struct inode *inode,
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struct btrfs_dio_data *dio_data,
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u64 start, u64 len)
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@ -7207,7 +7184,6 @@ static int btrfs_get_blocks_direct_write(struct extent_map **map,
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}
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/* this will cow the extent */
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len = bh_result->b_size;
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free_extent_map(em);
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*map = em = btrfs_new_extent_direct(inode, start, len);
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if (IS_ERR(em)) {
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@ -7218,64 +7194,73 @@ static int btrfs_get_blocks_direct_write(struct extent_map **map,
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len = min(len, em->len - (start - em->start));
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skip_cow:
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bh_result->b_blocknr = (em->block_start + (start - em->start)) >>
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inode->i_blkbits;
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bh_result->b_size = len;
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bh_result->b_bdev = fs_info->fs_devices->latest_bdev;
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set_buffer_mapped(bh_result);
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if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
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set_buffer_new(bh_result);
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/*
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* Need to update the i_size under the extent lock so buffered
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* readers will get the updated i_size when we unlock.
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*/
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if (!dio_data->overwrite && start + len > i_size_read(inode))
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if (start + len > i_size_read(inode))
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i_size_write(inode, start + len);
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WARN_ON(dio_data->reserve < len);
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dio_data->reserve -= len;
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dio_data->unsubmitted_oe_range_end = start + len;
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current->journal_info = dio_data;
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out:
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return ret;
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}
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static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
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struct buffer_head *bh_result, int create)
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static int btrfs_dio_iomap_begin(struct inode *inode, loff_t start,
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loff_t length, unsigned flags, struct iomap *iomap,
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struct iomap *srcmap)
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{
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struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
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struct extent_map *em;
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struct extent_state *cached_state = NULL;
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struct btrfs_dio_data *dio_data = NULL;
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u64 start = iblock << inode->i_blkbits;
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u64 lockstart, lockend;
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u64 len = bh_result->b_size;
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const bool write = !!(flags & IOMAP_WRITE);
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int ret = 0;
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u64 len = length;
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bool unlock_extents = false;
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if (!create)
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if (!write)
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len = min_t(u64, len, fs_info->sectorsize);
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lockstart = start;
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lockend = start + len - 1;
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if (current->journal_info) {
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/*
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* Need to pull our outstanding extents and set journal_info to NULL so
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* that anything that needs to check if there's a transaction doesn't get
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* confused.
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* The generic stuff only does filemap_write_and_wait_range, which
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* isn't enough if we've written compressed pages to this area, so we
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* need to flush the dirty pages again to make absolutely sure that any
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* outstanding dirty pages are on disk.
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*/
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dio_data = current->journal_info;
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current->journal_info = NULL;
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if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
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&BTRFS_I(inode)->runtime_flags))
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ret = filemap_fdatawrite_range(inode->i_mapping, start,
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start + length - 1);
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dio_data = kzalloc(sizeof(*dio_data), GFP_NOFS);
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if (!dio_data)
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return -ENOMEM;
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dio_data->length = length;
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if (write) {
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dio_data->reserve = round_up(length, fs_info->sectorsize);
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ret = btrfs_delalloc_reserve_space(inode,
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&dio_data->data_reserved,
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start, dio_data->reserve);
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if (ret) {
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extent_changeset_free(dio_data->data_reserved);
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kfree(dio_data);
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return ret;
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}
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}
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iomap->private = dio_data;
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/*
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* If this errors out it's because we couldn't invalidate pagecache for
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* this range and we need to fallback to buffered.
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*/
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if (lock_extent_direct(inode, lockstart, lockend, &cached_state,
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create)) {
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if (lock_extent_direct(inode, lockstart, lockend, &cached_state, write)) {
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ret = -ENOTBLK;
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goto err;
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}
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@ -7307,35 +7292,47 @@ static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
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goto unlock_err;
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}
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if (create) {
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ret = btrfs_get_blocks_direct_write(&em, bh_result, inode,
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dio_data, start, len);
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len = min(len, em->len - (start - em->start));
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if (write) {
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ret = btrfs_get_blocks_direct_write(&em, inode, dio_data,
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start, len);
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if (ret < 0)
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goto unlock_err;
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unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart,
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lockend, &cached_state);
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unlock_extents = true;
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/* Recalc len in case the new em is smaller than requested */
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len = min(len, em->len - (start - em->start));
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} else {
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ret = btrfs_get_blocks_direct_read(em, bh_result, inode,
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start, len);
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/* Can be negative only if we read from a hole */
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if (ret < 0) {
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ret = 0;
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free_extent_map(em);
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goto unlock_err;
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}
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/*
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* We need to unlock only the end area that we aren't using.
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* The rest is going to be unlocked by the endio routine.
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*/
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lockstart = start + bh_result->b_size;
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if (lockstart < lockend) {
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lockstart = start + len;
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if (lockstart < lockend)
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unlock_extents = true;
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}
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if (unlock_extents)
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unlock_extent_cached(&BTRFS_I(inode)->io_tree,
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lockstart, lockend, &cached_state);
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} else {
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else
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free_extent_state(cached_state);
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/*
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* Translate extent map information to iomap.
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* We trim the extents (and move the addr) even though iomap code does
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* that, since we have locked only the parts we are performing I/O in.
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*/
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if ((em->block_start == EXTENT_MAP_HOLE) ||
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(test_bit(EXTENT_FLAG_PREALLOC, &em->flags) && !write)) {
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iomap->addr = IOMAP_NULL_ADDR;
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iomap->type = IOMAP_HOLE;
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} else {
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iomap->addr = em->block_start + (start - em->start);
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iomap->type = IOMAP_MAPPED;
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}
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}
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iomap->offset = start;
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iomap->bdev = fs_info->fs_devices->latest_bdev;
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iomap->length = len;
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free_extent_map(em);
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@ -7345,8 +7342,53 @@ static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
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unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend,
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&cached_state);
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err:
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if (dio_data)
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current->journal_info = dio_data;
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if (dio_data) {
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btrfs_delalloc_release_space(inode, dio_data->data_reserved,
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start, dio_data->reserve, true);
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btrfs_delalloc_release_extents(BTRFS_I(inode), dio_data->reserve);
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extent_changeset_free(dio_data->data_reserved);
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kfree(dio_data);
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}
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return ret;
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}
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static int btrfs_dio_iomap_end(struct inode *inode, loff_t pos, loff_t length,
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ssize_t written, unsigned flags, struct iomap *iomap)
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{
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int ret = 0;
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struct btrfs_dio_data *dio_data = iomap->private;
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size_t submitted = dio_data->submitted;
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const bool write = !!(flags & IOMAP_WRITE);
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if (!write && (iomap->type == IOMAP_HOLE)) {
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/* If reading from a hole, unlock and return */
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unlock_extent(&BTRFS_I(inode)->io_tree, pos, pos + length - 1);
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goto out;
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}
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if (submitted < length) {
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pos += submitted;
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length -= submitted;
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if (write)
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__endio_write_update_ordered(inode, pos, length, false);
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else
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unlock_extent(&BTRFS_I(inode)->io_tree, pos,
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pos + length - 1);
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ret = -ENOTBLK;
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}
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if (write) {
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if (dio_data->reserve)
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btrfs_delalloc_release_space(inode,
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dio_data->data_reserved, pos,
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dio_data->reserve, true);
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btrfs_delalloc_release_extents(BTRFS_I(inode), dio_data->length);
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extent_changeset_free(dio_data->data_reserved);
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}
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out:
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kfree(dio_data);
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iomap->private = NULL;
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return ret;
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}
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@ -7369,7 +7411,7 @@ static void btrfs_dio_private_put(struct btrfs_dio_private *dip)
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dip->logical_offset + dip->bytes - 1);
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}
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dio_end_io(dip->dio_bio);
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bio_endio(dip->dio_bio);
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kfree(dip);
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}
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@ -7605,24 +7647,11 @@ static struct btrfs_dio_private *btrfs_create_dio_private(struct bio *dio_bio,
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dip->disk_bytenr = (u64)dio_bio->bi_iter.bi_sector << 9;
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dip->dio_bio = dio_bio;
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refcount_set(&dip->refs, 1);
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if (write) {
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struct btrfs_dio_data *dio_data = current->journal_info;
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/*
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* Setting range start and end to the same value means that
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* no cleanup will happen in btrfs_direct_IO
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*/
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dio_data->unsubmitted_oe_range_end = dip->logical_offset +
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dip->bytes;
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dio_data->unsubmitted_oe_range_start =
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dio_data->unsubmitted_oe_range_end;
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}
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return dip;
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}
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static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode,
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loff_t file_offset)
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static blk_qc_t btrfs_submit_direct(struct inode *inode, struct iomap *iomap,
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struct bio *dio_bio, loff_t file_offset)
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{
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const bool write = (bio_op(dio_bio) == REQ_OP_WRITE);
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const bool csum = !(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM);
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@ -7639,6 +7668,7 @@ static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode,
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int ret;
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blk_status_t status;
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struct btrfs_io_geometry geom;
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struct btrfs_dio_data *dio_data = iomap->private;
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dip = btrfs_create_dio_private(dio_bio, inode, file_offset);
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if (!dip) {
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@ -7647,8 +7677,8 @@ static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode,
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file_offset + dio_bio->bi_iter.bi_size - 1);
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}
|
||||
dio_bio->bi_status = BLK_STS_RESOURCE;
|
||||
dio_end_io(dio_bio);
|
||||
return;
|
||||
bio_endio(dio_bio);
|
||||
return BLK_QC_T_NONE;
|
||||
}
|
||||
|
||||
if (!write && csum) {
|
||||
|
|
@ -7719,15 +7749,17 @@ static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode,
|
|||
goto out_err;
|
||||
}
|
||||
|
||||
dio_data->submitted += clone_len;
|
||||
clone_offset += clone_len;
|
||||
start_sector += clone_len >> 9;
|
||||
file_offset += clone_len;
|
||||
} while (submit_len > 0);
|
||||
return;
|
||||
return BLK_QC_T_NONE;
|
||||
|
||||
out_err:
|
||||
dip->dio_bio->bi_status = status;
|
||||
btrfs_dio_private_put(dip);
|
||||
return BLK_QC_T_NONE;
|
||||
}
|
||||
|
||||
static ssize_t check_direct_IO(struct btrfs_fs_info *fs_info,
|
||||
|
|
@ -7763,37 +7795,30 @@ static ssize_t check_direct_IO(struct btrfs_fs_info *fs_info,
|
|||
return retval;
|
||||
}
|
||||
|
||||
static ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
|
||||
static const struct iomap_ops btrfs_dio_iomap_ops = {
|
||||
.iomap_begin = btrfs_dio_iomap_begin,
|
||||
.iomap_end = btrfs_dio_iomap_end,
|
||||
};
|
||||
|
||||
static const struct iomap_dio_ops btrfs_dops = {
|
||||
.submit_io = btrfs_submit_direct,
|
||||
};
|
||||
|
||||
ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
|
||||
{
|
||||
struct file *file = iocb->ki_filp;
|
||||
struct inode *inode = file->f_mapping->host;
|
||||
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
||||
struct btrfs_dio_data dio_data = { 0 };
|
||||
struct extent_changeset *data_reserved = NULL;
|
||||
loff_t offset = iocb->ki_pos;
|
||||
size_t count = 0;
|
||||
int flags = 0;
|
||||
bool wakeup = true;
|
||||
bool relock = false;
|
||||
ssize_t ret;
|
||||
|
||||
if (check_direct_IO(fs_info, iter, offset))
|
||||
return 0;
|
||||
|
||||
inode_dio_begin(inode);
|
||||
|
||||
/*
|
||||
* The generic stuff only does filemap_write_and_wait_range, which
|
||||
* isn't enough if we've written compressed pages to this area, so
|
||||
* we need to flush the dirty pages again to make absolutely sure
|
||||
* that any outstanding dirty pages are on disk.
|
||||
*/
|
||||
count = iov_iter_count(iter);
|
||||
if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
|
||||
&BTRFS_I(inode)->runtime_flags))
|
||||
filemap_fdatawrite_range(inode->i_mapping, offset,
|
||||
offset + count - 1);
|
||||
|
||||
if (iov_iter_rw(iter) == WRITE) {
|
||||
/*
|
||||
* If the write DIO is beyond the EOF, we need update
|
||||
|
|
@ -7801,71 +7826,24 @@ static ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
|
|||
* not unlock the i_mutex at this case.
|
||||
*/
|
||||
if (offset + count <= inode->i_size) {
|
||||
dio_data.overwrite = 1;
|
||||
inode_unlock(inode);
|
||||
relock = true;
|
||||
} else if (iocb->ki_flags & IOCB_NOWAIT) {
|
||||
ret = -EAGAIN;
|
||||
goto out;
|
||||
}
|
||||
ret = btrfs_delalloc_reserve_space(inode, &data_reserved,
|
||||
offset, count);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
/*
|
||||
* We need to know how many extents we reserved so that we can
|
||||
* do the accounting properly if we go over the number we
|
||||
* originally calculated. Abuse current->journal_info for this.
|
||||
*/
|
||||
dio_data.reserve = round_up(count,
|
||||
fs_info->sectorsize);
|
||||
dio_data.unsubmitted_oe_range_start = (u64)offset;
|
||||
dio_data.unsubmitted_oe_range_end = (u64)offset;
|
||||
current->journal_info = &dio_data;
|
||||
down_read(&BTRFS_I(inode)->dio_sem);
|
||||
} else if (test_bit(BTRFS_INODE_READDIO_NEED_LOCK,
|
||||
&BTRFS_I(inode)->runtime_flags)) {
|
||||
inode_dio_end(inode);
|
||||
flags = DIO_LOCKING | DIO_SKIP_HOLES;
|
||||
wakeup = false;
|
||||
}
|
||||
|
||||
ret = __blockdev_direct_IO(iocb, inode,
|
||||
fs_info->fs_devices->latest_bdev,
|
||||
iter, btrfs_get_blocks_direct, NULL,
|
||||
btrfs_submit_direct, flags);
|
||||
ret = iomap_dio_rw(iocb, iter, &btrfs_dio_iomap_ops, &btrfs_dops,
|
||||
is_sync_kiocb(iocb));
|
||||
|
||||
if (iov_iter_rw(iter) == WRITE) {
|
||||
up_read(&BTRFS_I(inode)->dio_sem);
|
||||
current->journal_info = NULL;
|
||||
if (ret < 0 && ret != -EIOCBQUEUED) {
|
||||
if (dio_data.reserve)
|
||||
btrfs_delalloc_release_space(inode, data_reserved,
|
||||
offset, dio_data.reserve, true);
|
||||
/*
|
||||
* On error we might have left some ordered extents
|
||||
* without submitting corresponding bios for them, so
|
||||
* cleanup them up to avoid other tasks getting them
|
||||
* and waiting for them to complete forever.
|
||||
*/
|
||||
if (dio_data.unsubmitted_oe_range_start <
|
||||
dio_data.unsubmitted_oe_range_end)
|
||||
__endio_write_update_ordered(inode,
|
||||
dio_data.unsubmitted_oe_range_start,
|
||||
dio_data.unsubmitted_oe_range_end -
|
||||
dio_data.unsubmitted_oe_range_start,
|
||||
false);
|
||||
} else if (ret >= 0 && (size_t)ret < count)
|
||||
btrfs_delalloc_release_space(inode, data_reserved,
|
||||
offset, count - (size_t)ret, true);
|
||||
btrfs_delalloc_release_extents(BTRFS_I(inode), count);
|
||||
}
|
||||
out:
|
||||
if (wakeup)
|
||||
inode_dio_end(inode);
|
||||
if (relock)
|
||||
inode_lock(inode);
|
||||
|
||||
extent_changeset_free(data_reserved);
|
||||
return ret;
|
||||
}
|
||||
|
|
@ -10181,7 +10159,7 @@ static const struct address_space_operations btrfs_aops = {
|
|||
.writepage = btrfs_writepage,
|
||||
.writepages = btrfs_writepages,
|
||||
.readpages = btrfs_readpages,
|
||||
.direct_IO = btrfs_direct_IO,
|
||||
.direct_IO = noop_direct_IO,
|
||||
.invalidatepage = btrfs_invalidatepage,
|
||||
.releasepage = btrfs_releasepage,
|
||||
#ifdef CONFIG_MIGRATION
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user