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authorAl Viro <viro@zeniv.linux.org.uk>2016-11-01 22:09:04 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2016-12-05 14:33:36 -0500
commitcbbd26b8b1a6af9c02e2b6523e12bd50cc765059 (patch)
tree6d1b258c99e83f320cf3611bdc927121df7e9b03 /fs/orangefs
parente5517c2a5a49ed5e99047008629f1cd60246ea0e (diff)
downloadlinux-cbbd26b8b1a6af9c02e2b6523e12bd50cc765059.tar.bz2
[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/orangefs')
-rw-r--r--fs/orangefs/devorangefs-req.c13
1 files changed, 4 insertions, 9 deletions
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;