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OpenCloudOS-Kernel
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9p: Make use of iounit for read/write 

Change the v9fs_file_readn function to limit the maximum transfer size
based on the iounit or msize.

Also remove the redundant check for limiting the transfer size in
v9fs_file_write. This check is done by p9_client_write.

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
M. Mohan Kumar 2010-06-04 11:59:07 +00:00 committed by Eric Van Hensbergen
parent cff6b8a9b8
commit 97e8442b09
1 changed files with 7 additions and 6 deletions
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13
fs/9p/vfs_file.c
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@ -139,7 +139,7 @@ ssize_t
v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
u64 offset)
{
int n, total;
int n, total, size;
struct p9_fid *fid = filp->private_data;
P9_DPRINTK(P9_DEBUG_VFS, "fid %d offset %llu count %d\n", fid->fid,
@ -147,6 +147,7 @@ v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
n = 0;
total = 0;
size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
do {
n = p9_client_read(fid, data, udata, offset, count);
if (n <= 0)
@ -160,7 +161,7 @@ v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
offset += n;
count -= n;
total += n;
} while (count > 0 && n == (fid->clnt->msize - P9_IOHDRSZ));
} while (count > 0 && n == size);
if (n < 0)
total = n;
@ -183,11 +184,13 @@ v9fs_file_read(struct file *filp, char __user *udata, size_t count,
{
int ret;
struct p9_fid *fid;
size_t size;
P9_DPRINTK(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset);
fid = filp->private_data;
if (count > (fid->clnt->msize - P9_IOHDRSZ))
size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
if (count > size)
ret = v9fs_file_readn(filp, NULL, udata, count, *offset);
else
ret = p9_client_read(fid, NULL, udata, *offset, count);
@ -224,9 +227,7 @@ v9fs_file_write(struct file *filp, const char __user * data,
fid = filp->private_data;
clnt = fid->clnt;
rsize = fid->iounit;
if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
rsize = clnt->msize - P9_IOHDRSZ;
rsize = fid->iounit ? fid->iounit : clnt->msize - P9_IOHDRSZ;
do {
if (count < rsize)