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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-10-20 00:10:27 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-10-20 00:10:27 -0300
commitd0b2f91bede3bd5e3d24dd6803e56eee959c1797 (patch)
tree7fee4ab0509879c373c4f2cbd5b8a5be5b4041ee /include/linux/iomap.h
parente914f8eb445e8f74b00303c19c2ffceaedd16a05 (diff)
Linux-libre 4.8.2-gnupck-4.8.2-gnu
Diffstat (limited to 'include/linux/iomap.h')
-rw-r--r--include/linux/iomap.h76
1 files changed, 76 insertions, 0 deletions
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
new file mode 100644
index 000000000..3d70ece10
--- /dev/null
+++ b/include/linux/iomap.h
@@ -0,0 +1,76 @@
+#ifndef LINUX_IOMAP_H
+#define LINUX_IOMAP_H 1
+
+#include <linux/types.h>
+
+struct fiemap_extent_info;
+struct inode;
+struct iov_iter;
+struct kiocb;
+struct vm_area_struct;
+struct vm_fault;
+
+/*
+ * Types of block ranges for iomap mappings:
+ */
+#define IOMAP_HOLE 0x01 /* no blocks allocated, need allocation */
+#define IOMAP_DELALLOC 0x02 /* delayed allocation blocks */
+#define IOMAP_MAPPED 0x03 /* blocks allocated @blkno */
+#define IOMAP_UNWRITTEN 0x04 /* blocks allocated @blkno in unwritten state */
+
+/*
+ * Flags for iomap mappings:
+ */
+#define IOMAP_F_MERGED 0x01 /* contains multiple blocks/extents */
+
+/*
+ * Magic value for blkno:
+ */
+#define IOMAP_NULL_BLOCK -1LL /* blkno is not valid */
+
+struct iomap {
+ sector_t blkno; /* 1st sector of mapping, 512b units */
+ loff_t offset; /* file offset of mapping, bytes */
+ u64 length; /* length of mapping, bytes */
+ u16 type; /* type of mapping */
+ u16 flags; /* flags for mapping */
+ struct block_device *bdev; /* block device for I/O */
+};
+
+/*
+ * Flags for iomap_begin / iomap_end. No flag implies a read.
+ */
+#define IOMAP_WRITE (1 << 0)
+#define IOMAP_ZERO (1 << 1)
+
+struct iomap_ops {
+ /*
+ * Return the existing mapping at pos, or reserve space starting at
+ * pos for up to length, as long as we can do it as a single mapping.
+ * The actual length is returned in iomap->length.
+ */
+ int (*iomap_begin)(struct inode *inode, loff_t pos, loff_t length,
+ unsigned flags, struct iomap *iomap);
+
+ /*
+ * Commit and/or unreserve space previous allocated using iomap_begin.
+ * Written indicates the length of the successful write operation which
+ * needs to be commited, while the rest needs to be unreserved.
+ * Written might be zero if no data was written.
+ */
+ int (*iomap_end)(struct inode *inode, loff_t pos, loff_t length,
+ ssize_t written, unsigned flags, struct iomap *iomap);
+};
+
+ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
+ struct iomap_ops *ops);
+int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len,
+ bool *did_zero, struct iomap_ops *ops);
+int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
+ struct iomap_ops *ops);
+int iomap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
+ struct iomap_ops *ops);
+int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+ loff_t start, loff_t len, struct iomap_ops *ops);
+
+#endif /* LINUX_IOMAP_H */