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![Christoph Hellwig](/assets/img/avatar_default.png)
Store the request queue the last bio was submitted to in the iocb private data in addition to the cookie so that we find the right block device. Also refactor the common direct I/O bio submission code into a nice little helper. Signed-off-by: Christoph Hellwig <hch@lst.de> Modified to use bio_set_polled(). Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
178 lines
6 KiB
C
178 lines
6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef LINUX_IOMAP_H
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#define LINUX_IOMAP_H 1
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#include <linux/atomic.h>
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#include <linux/bitmap.h>
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#include <linux/mm.h>
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#include <linux/types.h>
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#include <linux/mm_types.h>
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struct address_space;
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struct fiemap_extent_info;
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struct inode;
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struct iov_iter;
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struct kiocb;
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struct page;
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struct vm_area_struct;
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struct vm_fault;
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/*
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* Types of block ranges for iomap mappings:
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*/
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#define IOMAP_HOLE 0x01 /* no blocks allocated, need allocation */
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#define IOMAP_DELALLOC 0x02 /* delayed allocation blocks */
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#define IOMAP_MAPPED 0x03 /* blocks allocated at @addr */
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#define IOMAP_UNWRITTEN 0x04 /* blocks allocated at @addr in unwritten state */
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#define IOMAP_INLINE 0x05 /* data inline in the inode */
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/*
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* Flags for all iomap mappings:
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*
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* IOMAP_F_DIRTY indicates the inode has uncommitted metadata needed to access
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* written data and requires fdatasync to commit them to persistent storage.
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*/
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#define IOMAP_F_NEW 0x01 /* blocks have been newly allocated */
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#define IOMAP_F_DIRTY 0x02 /* uncommitted metadata */
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#define IOMAP_F_BUFFER_HEAD 0x04 /* file system requires buffer heads */
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/*
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* Flags that only need to be reported for IOMAP_REPORT requests:
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*/
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#define IOMAP_F_MERGED 0x10 /* contains multiple blocks/extents */
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#define IOMAP_F_SHARED 0x20 /* block shared with another file */
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/*
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* Flags from 0x1000 up are for file system specific usage:
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*/
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#define IOMAP_F_PRIVATE 0x1000
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/*
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* Magic value for addr:
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*/
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#define IOMAP_NULL_ADDR -1ULL /* addr is not valid */
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struct iomap {
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u64 addr; /* disk offset of mapping, bytes */
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loff_t offset; /* file offset of mapping, bytes */
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u64 length; /* length of mapping, bytes */
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u16 type; /* type of mapping */
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u16 flags; /* flags for mapping */
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struct block_device *bdev; /* block device for I/O */
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struct dax_device *dax_dev; /* dax_dev for dax operations */
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void *inline_data;
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void *private; /* filesystem private */
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/*
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* Called when finished processing a page in the mapping returned in
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* this iomap. At least for now this is only supported in the buffered
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* write path.
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*/
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void (*page_done)(struct inode *inode, loff_t pos, unsigned copied,
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struct page *page, struct iomap *iomap);
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};
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/*
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* Flags for iomap_begin / iomap_end. No flag implies a read.
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*/
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#define IOMAP_WRITE (1 << 0) /* writing, must allocate blocks */
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#define IOMAP_ZERO (1 << 1) /* zeroing operation, may skip holes */
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#define IOMAP_REPORT (1 << 2) /* report extent status, e.g. FIEMAP */
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#define IOMAP_FAULT (1 << 3) /* mapping for page fault */
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#define IOMAP_DIRECT (1 << 4) /* direct I/O */
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#define IOMAP_NOWAIT (1 << 5) /* do not block */
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struct iomap_ops {
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/*
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* Return the existing mapping at pos, or reserve space starting at
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* pos for up to length, as long as we can do it as a single mapping.
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* The actual length is returned in iomap->length.
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*/
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int (*iomap_begin)(struct inode *inode, loff_t pos, loff_t length,
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unsigned flags, struct iomap *iomap);
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/*
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* Commit and/or unreserve space previous allocated using iomap_begin.
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* Written indicates the length of the successful write operation which
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* needs to be commited, while the rest needs to be unreserved.
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* Written might be zero if no data was written.
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*/
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int (*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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/*
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* Structure allocate for each page when block size < PAGE_SIZE to track
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* sub-page uptodate status and I/O completions.
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*/
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struct iomap_page {
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atomic_t read_count;
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atomic_t write_count;
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DECLARE_BITMAP(uptodate, PAGE_SIZE / 512);
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};
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static inline struct iomap_page *to_iomap_page(struct page *page)
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{
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if (page_has_private(page))
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return (struct iomap_page *)page_private(page);
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return NULL;
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}
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ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
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const struct iomap_ops *ops);
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int iomap_readpage(struct page *page, const struct iomap_ops *ops);
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int iomap_readpages(struct address_space *mapping, struct list_head *pages,
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unsigned nr_pages, const struct iomap_ops *ops);
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int iomap_set_page_dirty(struct page *page);
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int iomap_is_partially_uptodate(struct page *page, unsigned long from,
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unsigned long count);
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int iomap_releasepage(struct page *page, gfp_t gfp_mask);
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void iomap_invalidatepage(struct page *page, unsigned int offset,
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unsigned int len);
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#ifdef CONFIG_MIGRATION
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int iomap_migrate_page(struct address_space *mapping, struct page *newpage,
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struct page *page, enum migrate_mode mode);
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#else
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#define iomap_migrate_page NULL
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#endif
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int iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len,
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const struct iomap_ops *ops);
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int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len,
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bool *did_zero, const struct iomap_ops *ops);
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int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
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const struct iomap_ops *ops);
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vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf,
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const struct iomap_ops *ops);
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int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
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loff_t start, loff_t len, const struct iomap_ops *ops);
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loff_t iomap_seek_hole(struct inode *inode, loff_t offset,
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const struct iomap_ops *ops);
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loff_t iomap_seek_data(struct inode *inode, loff_t offset,
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const struct iomap_ops *ops);
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sector_t iomap_bmap(struct address_space *mapping, sector_t bno,
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const struct iomap_ops *ops);
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/*
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* Flags for direct I/O ->end_io:
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*/
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#define IOMAP_DIO_UNWRITTEN (1 << 0) /* covers unwritten extent(s) */
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#define IOMAP_DIO_COW (1 << 1) /* covers COW extent(s) */
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typedef int (iomap_dio_end_io_t)(struct kiocb *iocb, ssize_t ret,
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unsigned flags);
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ssize_t iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
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const struct iomap_ops *ops, iomap_dio_end_io_t end_io);
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int iomap_dio_iopoll(struct kiocb *kiocb, bool spin);
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#ifdef CONFIG_SWAP
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struct file;
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struct swap_info_struct;
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int iomap_swapfile_activate(struct swap_info_struct *sis,
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struct file *swap_file, sector_t *pagespan,
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const struct iomap_ops *ops);
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#else
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# define iomap_swapfile_activate(sis, swapfile, pagespan, ops) (-EIO)
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#endif /* CONFIG_SWAP */
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#endif /* LINUX_IOMAP_H */
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