Simple code cleanup to prepare for later fixes.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/nfs/direct.c | 107 +++++++++++++++++++++++++------------------------------
1 file changed, 49 insertions(+), 58 deletions(-)
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 62ea415..8312796 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -458,14 +458,55 @@ static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
return 0;
}
-static ssize_t nfs_direct_read(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos, bool uio)
+/**
+ * nfs_file_direct_read - file direct read operation for NFS files
+ * @iocb: target I/O control block
+ * @iov: vector of user buffers into which to read data
+ * @nr_segs: size of iov vector
+ * @pos: byte offset in file where reading starts
+ *
+ * We use this function for direct reads instead of calling
+ * generic_file_aio_read() in order to avoid gfar's check to see if
+ * the request starts before the end of the file. For that check
+ * to work, we must generate a GETATTR before each direct read, and
+ * even then there is a window between the GETATTR and the subsequent
+ * READ where the file size could change. Our preference is simply
+ * to do all reads the application wants, and the server will take
+ * care of managing the end of file boundary.
+ *
+ * This function also eliminates unnecessarily updating the file's
+ * atime locally, as the NFS server sets the file's atime, and this
+ * client must read the updated atime from the server back into its
+ * cache.
+ */
+ssize_t nfs_file_direct_read(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos, bool uio)
{
- ssize_t result = -ENOMEM;
- struct inode *inode = iocb->ki_filp->f_mapping->host;
+ struct file *file = iocb->ki_filp;
+ struct address_space *mapping = file->f_mapping;
+ struct inode *inode = mapping->host;
struct nfs_direct_req *dreq;
struct nfs_lock_context *l_ctx;
+ ssize_t result = -EINVAL;
+ size_t count;
+
+ count = iov_length(iov, nr_segs);
+ nfs_add_stats(mapping->host, NFSIOS_DIRECTREADBYTES, count);
+
+ dfprintk(FILE, "NFS: direct read(%pD2, %zd@%Ld)\n",
+ file, count, (long long) pos);
+
+ result = 0;
+ if (!count)
+ goto out;
+
+ result = nfs_sync_mapping(mapping);
+ if (result)
+ goto out;
+
+ task_io_account_read(count);
+ result = -ENOMEM;
dreq = nfs_direct_req_alloc();
if (dreq == NULL)
goto out;
@@ -484,8 +525,11 @@ static ssize_t nfs_direct_read(struct kiocb *iocb, const struct iovec *iov,
NFS_I(inode)->read_io += iov_length(iov, nr_segs);
result = nfs_direct_read_schedule_iovec(dreq, iov, nr_segs, pos, uio);
- if (!result)
+ if (!result) {
result = nfs_direct_wait(dreq);
+ if (result > 0)
+ iocb->ki_pos = pos + result;
+ }
out_release:
nfs_direct_req_release(dreq);
out:
@@ -889,59 +933,6 @@ out:
}
/**
- * nfs_file_direct_read - file direct read operation for NFS files
- * @iocb: target I/O control block
- * @iov: vector of user buffers into which to read data
- * @nr_segs: size of iov vector
- * @pos: byte offset in file where reading starts
- *
- * We use this function for direct reads instead of calling
- * generic_file_aio_read() in order to avoid gfar's check to see if
- * the request starts before the end of the file. For that check
- * to work, we must generate a GETATTR before each direct read, and
- * even then there is a window between the GETATTR and the subsequent
- * READ where the file size could change. Our preference is simply
- * to do all reads the application wants, and the server will take
- * care of managing the end of file boundary.
- *
- * This function also eliminates unnecessarily updating the file's
- * atime locally, as the NFS server sets the file's atime, and this
- * client must read the updated atime from the server back into its
- * cache.
- */
-ssize_t nfs_file_direct_read(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos, bool uio)
-{
- ssize_t retval = -EINVAL;
- struct file *file = iocb->ki_filp;
- struct address_space *mapping = file->f_mapping;
- size_t count;
-
- count = iov_length(iov, nr_segs);
- nfs_add_stats(mapping->host, NFSIOS_DIRECTREADBYTES, count);
-
- dfprintk(FILE, "NFS: direct read(%pD2, %zd@%Ld)\n",
- file, count, (long long) pos);
-
- retval = 0;
- if (!count)
- goto out;
-
- retval = nfs_sync_mapping(mapping);
- if (retval)
- goto out;
-
- task_io_account_read(count);
-
- retval = nfs_direct_read(iocb, iov, nr_segs, pos, uio);
- if (retval > 0)
- iocb->ki_pos = pos + retval;
-
-out:
- return retval;
-}
-
-/**
* nfs_file_direct_write - file direct write operation for NFS files
* @iocb: target I/O control block
* @iov: vector of user buffers from which to write data
--
1.7.10.4
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