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| author | Christoph Hellwig <hch@lst.de> | 2016-06-21 01:23:11 +0200 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2016-06-21 01:23:11 +0200 |
| commit | ae259a9c8593f98aa60d045df978a5482a67c53f (patch) | |
| tree | a3c07fa9fb8c61475ff85f4d8812d83c287258ff /fs/internal.h | |
| parent | fs: move struct iomap from exportfs.h to a separate header (diff) | |
| download | linux-ae259a9c8593f98aa60d045df978a5482a67c53f.tar.xz linux-ae259a9c8593f98aa60d045df978a5482a67c53f.zip | |
fs: introduce iomap infrastructure
Add infrastructure for multipage buffered writes. This is implemented
using an main iterator that applies an actor function to a range that
can be written.
This infrastucture is used to implement a buffered write helper, one
to zero file ranges and one to implement the ->page_mkwrite VM
operations. All of them borrow a fair amount of code from fs/buffers.
for now by using an internal version of __block_write_begin that
gets passed an iomap and builds the corresponding buffer head.
The file system is gets a set of paired ->iomap_begin and ->iomap_end
calls which allow it to map/reserve a range and get a notification
once the write code is finished with it.
Based on earlier code from Dave Chinner.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/internal.h')
| -rw-r--r-- | fs/internal.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/internal.h b/fs/internal.h index b71deeecea17..c0c6f493ab8a 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -11,6 +11,7 @@ struct super_block; struct file_system_type; +struct iomap; struct linux_binprm; struct path; struct mount; @@ -39,6 +40,8 @@ static inline int __sync_blockdev(struct block_device *bdev, int wait) * buffer.c */ extern void guard_bio_eod(int rw, struct bio *bio); +extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len, + get_block_t *get_block, struct iomap *iomap); /* * char_dev.c |