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authorLinus Torvalds <torvalds@linux-foundation.org>2021-07-03 11:30:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-07-03 11:30:04 -0700
commitd3acb15a3a1b841dc709c3853ec900170b2478e5 (patch)
treedc5987350f602559b929232d5b0ea5b89a9f50cb /fs/btrfs/file.c
parentf92a322a63517a798f2da57d56b483a6ae8f45a1 (diff)
parent6852df1266995c35b8621a95dcb7f91ca11ea409 (diff)
Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull iov_iter updates from Al Viro: "iov_iter cleanups and fixes. There are followups, but this is what had sat in -next this cycle. IMO the macro forest in there became much thinner and easier to follow..." * 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (37 commits) csum_and_copy_to_pipe_iter(): leave handling of csum_state to caller clean up copy_mc_pipe_to_iter() pipe_zero(): we don't need no stinkin' kmap_atomic()... iov_iter: clean csum_and_copy_...() primitives up a bit copy_page_from_iter(): don't need kmap_atomic() for kvec/bvec cases copy_page_to_iter(): don't bother with kmap_atomic() for bvec/kvec cases iterate_xarray(): only of the first iteration we might get offset != 0 pull handling of ->iov_offset into iterate_{iovec,bvec,xarray} iov_iter: make iterator callbacks use base and len instead of iovec iov_iter: make the amount already copied available to iterator callbacks iov_iter: get rid of separate bvec and xarray callbacks iov_iter: teach iterate_{bvec,xarray}() about possible short copies iterate_bvec(): expand bvec.h macro forest, massage a bit iov_iter: unify iterate_iovec and iterate_kvec iov_iter: massage iterate_iovec and iterate_kvec to logics similar to iterate_bvec iterate_and_advance(): get rid of magic in case when n is 0 csum_and_copy_to_iter(): massage into form closer to csum_and_copy_from_iter() iov_iter: replace iov_iter_copy_from_user_atomic() with iterator-advancing variant [xarray] iov_iter_npages(): just use DIV_ROUND_UP() iov_iter_npages(): don't bother with iterate_all_kinds() ...
Diffstat (limited to 'fs/btrfs/file.c')
-rw-r--r--fs/btrfs/file.c23
1 files changed, 11 insertions, 12 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 28a05ba47060..ee34497500e1 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -399,7 +399,7 @@ static noinline int btrfs_copy_from_user(loff_t pos, size_t write_bytes,
/*
* Copy data from userspace to the current page
*/
- copied = iov_iter_copy_from_user_atomic(page, i, offset, count);
+ copied = copy_page_from_iter_atomic(page, offset, count, i);
/* Flush processor's dcache for this page */
flush_dcache_page(page);
@@ -413,20 +413,19 @@ static noinline int btrfs_copy_from_user(loff_t pos, size_t write_bytes,
* The rest of the btrfs_file_write code will fall
* back to page at a time copies after we return 0.
*/
- if (!PageUptodate(page) && copied < count)
- copied = 0;
+ if (unlikely(copied < count)) {
+ if (!PageUptodate(page)) {
+ iov_iter_revert(i, copied);
+ copied = 0;
+ }
+ if (!copied)
+ break;
+ }
- iov_iter_advance(i, copied);
write_bytes -= copied;
total_copied += copied;
-
- /* Return to btrfs_file_write_iter to fault page */
- if (unlikely(copied == 0))
- break;
-
- if (copied < PAGE_SIZE - offset) {
- offset += copied;
- } else {
+ offset += copied;
+ if (offset == PAGE_SIZE) {
pg++;
offset = 0;
}