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Diffstat (limited to 'fs/9p/vfs_file.c')
-rw-r--r--fs/9p/vfs_file.c93
1 files changed, 82 insertions, 11 deletions
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index 52944d2249a..041c5269228 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -120,23 +120,72 @@ static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
}
/**
- * v9fs_file_read - read from a file
+ * v9fs_file_readn - read from a file
* @filp: file pointer to read
* @data: data buffer to read data into
+ * @udata: user data buffer to read data into
* @count: size of buffer
* @offset: offset at which to read data
*
*/
+
+ssize_t
+v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
+ u64 offset)
+{
+ int n, total;
+ struct p9_fid *fid = filp->private_data;
+
+ P9_DPRINTK(P9_DEBUG_VFS, "fid %d offset %llu count %d\n", fid->fid,
+ (long long unsigned) offset, count);
+
+ n = 0;
+ total = 0;
+ do {
+ n = p9_client_read(fid, data, udata, offset, count);
+ if (n <= 0)
+ break;
+
+ if (data)
+ data += n;
+ if (udata)
+ udata += n;
+
+ offset += n;
+ count -= n;
+ total += n;
+ } while (count > 0 && n == (fid->clnt->msize - P9_IOHDRSZ));
+
+ if (n < 0)
+ total = n;
+
+ return total;
+}
+
+/**
+ * v9fs_file_read - read from a file
+ * @filp: file pointer to read
+ * @udata: user data buffer to read data into
+ * @count: size of buffer
+ * @offset: offset at which to read data
+ *
+ */
+
static ssize_t
-v9fs_file_read(struct file *filp, char __user * data, size_t count,
+v9fs_file_read(struct file *filp, char __user *udata, size_t count,
loff_t * offset)
{
int ret;
struct p9_fid *fid;
- P9_DPRINTK(P9_DEBUG_VFS, "\n");
+ P9_DPRINTK(P9_DEBUG_VFS, "count %d offset %lld\n", count, *offset);
fid = filp->private_data;
- ret = p9_client_uread(fid, data, *offset, count);
+
+ if (count > (fid->clnt->msize - P9_IOHDRSZ))
+ ret = v9fs_file_readn(filp, NULL, udata, count, *offset);
+ else
+ ret = p9_client_read(fid, NULL, udata, *offset, count);
+
if (ret > 0)
*offset += ret;
@@ -156,19 +205,38 @@ static ssize_t
v9fs_file_write(struct file *filp, const char __user * data,
size_t count, loff_t * offset)
{
- int ret;
+ int n, rsize, total = 0;
struct p9_fid *fid;
+ struct p9_client *clnt;
struct inode *inode = filp->f_path.dentry->d_inode;
+ int origin = *offset;
P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data,
(int)count, (int)*offset);
fid = filp->private_data;
- ret = p9_client_uwrite(fid, data, *offset, count);
- if (ret > 0) {
- invalidate_inode_pages2_range(inode->i_mapping, *offset,
- *offset+ret);
- *offset += ret;
+ clnt = fid->clnt;
+
+ rsize = fid->iounit;
+ if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
+ rsize = clnt->msize - P9_IOHDRSZ;
+
+ do {
+ if (count < rsize)
+ rsize = count;
+
+ n = p9_client_write(fid, NULL, data+total, *offset+total,
+ rsize);
+ if (n <= 0)
+ break;
+ count -= n;
+ total += n;
+ } while (count > 0);
+
+ if (total > 0) {
+ invalidate_inode_pages2_range(inode->i_mapping, origin,
+ origin+total);
+ *offset += total;
}
if (*offset > inode->i_size) {
@@ -176,7 +244,10 @@ v9fs_file_write(struct file *filp, const char __user * data,
inode->i_blocks = (inode->i_size + 512 - 1) >> 9;
}
- return ret;
+ if (n < 0)
+ return n;
+
+ return total;
}
static const struct file_operations v9fs_cached_file_operations = {