diff options
author | Nick Piggin <npiggin@suse.de> | 2007-10-16 01:24:59 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 09:42:55 -0700 |
commit | 2f718ffc16c43a435d12919c75dbfad518abd056 (patch) | |
tree | 55588cb2815d844e9d0b2404cf8ceafe98b5c55d /include | |
parent | 08291429cfa6258c4cd95d8833beb40f828b194e (diff) |
mm: buffered write iterator
Add an iterator data structure to operate over an iovec. Add usercopy
operators needed by generic_file_buffered_write, and convert that function
over.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/fs.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 500ffc0e4ac7..86ce27c72554 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -401,6 +401,39 @@ struct page; struct address_space; struct writeback_control; +struct iov_iter { + const struct iovec *iov; + unsigned long nr_segs; + size_t iov_offset; + size_t count; +}; + +size_t iov_iter_copy_from_user_atomic(struct page *page, + struct iov_iter *i, unsigned long offset, size_t bytes); +size_t iov_iter_copy_from_user(struct page *page, + struct iov_iter *i, unsigned long offset, size_t bytes); +void iov_iter_advance(struct iov_iter *i, size_t bytes); +int iov_iter_fault_in_readable(struct iov_iter *i); +size_t iov_iter_single_seg_count(struct iov_iter *i); + +static inline void iov_iter_init(struct iov_iter *i, + const struct iovec *iov, unsigned long nr_segs, + size_t count, size_t written) +{ + i->iov = iov; + i->nr_segs = nr_segs; + i->iov_offset = 0; + i->count = count + written; + + iov_iter_advance(i, written); +} + +static inline size_t iov_iter_count(struct iov_iter *i) +{ + return i->count; +} + + struct address_space_operations { int (*writepage)(struct page *page, struct writeback_control *wbc); int (*readpage)(struct file *, struct page *); |