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9p: consolidate read/write functions

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Currently there are two separate versions of read and write.  One for
dealing with user buffers and the other for dealing with kernel buffers.
There is a tremendous amount of code duplication in the otherwise
identical versions of these functions.  This patch adds an additional
user buffer parameter to read and write and conditionalizes handling of
the buffer on whether the kernel buffer or the user buffer is populated.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Eric Van Hensbergen
2008-10-13 20:36:17 -05:00
parent 95820a3651
commit 0fc9655ec6
3 changed files with 37 additions and 133 deletions
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4
fs/9p/vfs_file.c
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@@ -136,7 +136,7 @@ v9fs_file_read(struct file *filp, char __user * data, size_t count,
P9_DPRINTK(P9_DEBUG_VFS, "\n");
fid = filp->private_data;
ret = p9_client_uread(fid, data, *offset, count);
ret = p9_client_read(fid, NULL, data, *offset, count);
if (ret > 0)
*offset += ret;
@@ -164,7 +164,7 @@ v9fs_file_write(struct file *filp, const char __user * data,
(int)count, (int)*offset);
fid = filp->private_data;
ret = p9_client_uwrite(fid, data, *offset, count);
ret = p9_client_write(fid, NULL, data, *offset, count);
if (ret > 0) {
invalidate_inode_pages2_range(inode->i_mapping, *offset,
*offset+ret);