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| author |   Al Viro <viro@zeniv.linux.org.uk> | 2016-11-01 22:09:04 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-12-05 14:33:36 -0500 |
| commit | cbbd26b8b1a6af9c02e2b6523e12bd50cc765059 (patch) | |
| tree | 6d1b258c99e83f320cf3611bdc927121df7e9b03 /fs | |
| parent | Linux 4.9-rc7 (diff) | |
| download | linux-dev-cbbd26b8b1a6af9c02e2b6523e12bd50cc765059.tar.xz linux-dev-cbbd26b8b1a6af9c02e2b6523e12bd50cc765059.zip | |
[iov_iter] new primitives - copy_from_iter_full() and friends
copy_from_iter_full(), copy_from_iter_full_nocache() and
csum_and_copy_from_iter_full() - counterparts of copy_from_iter()
et.al., advancing iterator only in case of successful full copy
and returning whether it had been successful or not.
Convert some obvious users. *NOTE* - do not blindly assume that
something is a good candidate for those unless you are sure that
not advancing iov_iter in failure case is the right thing in
this case. Anything that does short read/short write kind of
stuff (or is in a loop, etc.) is unlikely to be a good one.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ncpfs/file.c | 2 | ||||
| -rw-r--r-- | fs/orangefs/devorangefs-req.c | 13 |
2 files changed, 5 insertions, 10 deletions
diff --git a/fs/ncpfs/file.c b/fs/ncpfs/file.c index dd38ca1f2ecb..83ca77231707 100644 --- a/fs/ncpfs/file.c +++ b/fs/ncpfs/file.c @@ -203,7 +203,7 @@ ncp_file_write_iter(struct kiocb *iocb, struct iov_iter *from) bufsize - (pos % bufsize), iov_iter_count(from)); - if (copy_from_iter(bouncebuffer, to_write, from) != to_write) { + if (!copy_from_iter_full(bouncebuffer, to_write, from)) { errno = -EFAULT; break; } diff --git a/fs/orangefs/devorangefs-req.c b/fs/orangefs/devorangefs-req.c index 516ffb4dc9a0..b0ced669427e 100644 --- a/fs/orangefs/devorangefs-req.c +++ b/fs/orangefs/devorangefs-req.c @@ -355,7 +355,6 @@ static ssize_t orangefs_devreq_write_iter(struct kiocb *iocb, __u64 tag; } head; int total = ret = iov_iter_count(iter); - int n; int downcall_size = sizeof(struct orangefs_downcall_s); int head_size = sizeof(head); @@ -372,8 +371,7 @@ static ssize_t orangefs_devreq_write_iter(struct kiocb *iocb, return -EFAULT; } - n = copy_from_iter(&head, head_size, iter); - if (n < head_size) { + if (!copy_from_iter_full(&head, head_size, iter)) { gossip_err("%s: failed to copy head.\n", __func__); return -EFAULT; } @@ -407,8 +405,7 @@ static ssize_t orangefs_devreq_write_iter(struct kiocb *iocb, return ret; } - n = copy_from_iter(&op->downcall, downcall_size, iter); - if (n != downcall_size) { + if (!copy_from_iter_full(&op->downcall, downcall_size, iter)) { gossip_err("%s: failed to copy downcall.\n", __func__); goto Efault; } @@ -462,10 +459,8 @@ static ssize_t orangefs_devreq_write_iter(struct kiocb *iocb, goto Enomem; } memset(op->downcall.trailer_buf, 0, op->downcall.trailer_size); - n = copy_from_iter(op->downcall.trailer_buf, - op->downcall.trailer_size, - iter); - if (n != op->downcall.trailer_size) { + if (!copy_from_iter_full(op->downcall.trailer_buf, + op->downcall.trailer_size, iter)) { gossip_err("%s: failed to copy trailer.\n", __func__); vfree(op->downcall.trailer_buf); goto Efault; |