Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=19f737879cc623c3aa73e655465faa3bff121768
Commit: 19f737879cc623c3aa73e655465faa3bff121768
Parent: 014313a9d66272ed37b9ebd64c3f30b596a4c8e1
Author: Chuck Lever <[EMAIL PROTECTED]>
AuthorDate: Mon Nov 12 12:16:47 2007 -0500
Committer: Trond Myklebust <[EMAIL PROTECTED]>
CommitDate: Mon Nov 26 16:32:35 2007 -0500
NFS: Introduce iovec I/O helpers to fs/nfs/direct.c
Add helpers that iterate over multi-segment iovecs. These will
be used to support multi-segment scatter/gather direct I/O in a
later patch.
Signed-off-by: Chuck Lever <[EMAIL PROTECTED]>
Signed-off-by: Chuck Lever <[EMAIL PROTECTED]>
Signed-off-by: Trond Myklebust <[EMAIL PROTECTED]>
---
fs/nfs/direct.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 71 insertions(+), 0 deletions(-)
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index afcab00..e30d928 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -355,6 +355,41 @@ static ssize_t nfs_direct_read_schedule(struct
nfs_direct_req *dreq, unsigned lo
return result < 0 ? (ssize_t) result : -EFAULT;
}
+static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
+ const struct iovec *iov,
+ unsigned long nr_segs,
+ loff_t pos)
+{
+ ssize_t result = -EINVAL;
+ size_t requested_bytes = 0;
+ unsigned long seg;
+
+ get_dreq(dreq);
+
+ for (seg = 0; seg < nr_segs; seg++) {
+ const struct iovec *vec = &iov[seg];
+ result = nfs_direct_read_schedule(dreq,
+ (unsigned long)vec->iov_base,
+ vec->iov_len, pos);
+ if (result < 0)
+ break;
+ requested_bytes += result;
+ if ((size_t)result < vec->iov_len)
+ break;
+ pos += vec->iov_len;
+ }
+
+ if (put_dreq(dreq))
+ nfs_direct_complete(dreq);
+
+ if (requested_bytes != 0)
+ return 0;
+
+ if (result < 0)
+ return result;
+ return -EIO;
+}
+
static ssize_t nfs_direct_read(struct kiocb *iocb, unsigned long user_addr,
size_t count, loff_t pos)
{
ssize_t result = 0;
@@ -697,6 +732,42 @@ static ssize_t nfs_direct_write_schedule(struct
nfs_direct_req *dreq, unsigned l
return result < 0 ? (ssize_t) result : -EFAULT;
}
+static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
+ const struct iovec *iov,
+ unsigned long nr_segs,
+ loff_t pos, int sync)
+{
+ ssize_t result = 0;
+ size_t requested_bytes = 0;
+ unsigned long seg;
+
+ get_dreq(dreq);
+
+ for (seg = 0; seg < nr_segs; seg++) {
+ const struct iovec *vec = &iov[seg];
+ result = nfs_direct_write_schedule(dreq,
+ (unsigned long)vec->iov_base,
+ vec->iov_len,
+ pos, sync);
+ if (result < 0)
+ break;
+ requested_bytes += result;
+ if ((size_t)result < vec->iov_len)
+ break;
+ pos += vec->iov_len;
+ }
+
+ if (put_dreq(dreq))
+ nfs_direct_write_complete(dreq, dreq->inode);
+
+ if (requested_bytes != 0)
+ return 0;
+
+ if (result < 0)
+ return result;
+ return -EIO;
+}
+
static ssize_t nfs_direct_write(struct kiocb *iocb, unsigned long user_addr,
size_t count, loff_t pos)
{
ssize_t result = 0;
-
To unsubscribe from this list: send the line "unsubscribe git-commits-head" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
