From fbedadc16e5c888e4df9df3b1757de4993508d35 Mon Sep 17 00:00:00 2001 From: Eric Van Hensbergen Date: Mon, 13 Oct 2008 20:36:16 -0500 Subject: [PATCH] 9p: move readn meta-function from client to fs layer There are a couple of methods in the client code which aren't actually wire operations. To keep things organized cleaner, these operations are being moved to the fs layer. This patch moves the readn meta-function (which executes multiple wire reads until a buffer is full) to the fs layer. Signed-off-by: Eric Van Hensbergen --- fs/9p/v9fs.c | 2 +- fs/9p/v9fs_vfs.h | 2 ++ fs/9p/vfs_addr.c | 5 +--- fs/9p/vfs_file.c | 57 ++++++++++++++++++++++++++++++++++++++--- include/net/9p/client.h | 1 - net/9p/client.c | 26 ------------------- 6 files changed, 57 insertions(+), 36 deletions(-) diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c index b6b85cf01e0..24eb01087b6 100644 --- a/fs/9p/v9fs.c +++ b/fs/9p/v9fs.c @@ -234,7 +234,7 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, if (!v9ses->clnt->dotu) v9ses->flags &= ~V9FS_EXTENDED; - v9ses->maxdata = v9ses->clnt->msize; + v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ; /* for legacy mode, fall back to V9FS_ACCESS_ANY */ if (!v9fs_extended(v9ses) && diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h index 57997fa14e6..046cff377f1 100644 --- a/fs/9p/v9fs_vfs.h +++ b/fs/9p/v9fs_vfs.h @@ -52,3 +52,5 @@ int v9fs_file_open(struct inode *inode, struct file *file); void v9fs_inode2stat(struct inode *inode, struct p9_stat *stat); void v9fs_dentry_release(struct dentry *); int v9fs_uflags2omode(int uflags, int extended); + +ssize_t v9fs_file_readn(struct file *, char *, char __user *, u32, u64); diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c index 97d3aed5798..6fcb1e7095c 100644 --- a/fs/9p/vfs_addr.c +++ b/fs/9p/vfs_addr.c @@ -38,7 +38,6 @@ #include "v9fs.h" #include "v9fs_vfs.h" -#include "fid.h" /** * v9fs_vfs_readpage - read an entire page in from 9P @@ -53,14 +52,12 @@ static int v9fs_vfs_readpage(struct file *filp, struct page *page) int retval; loff_t offset; char *buffer; - struct p9_fid *fid; P9_DPRINTK(P9_DEBUG_VFS, "\n"); - fid = filp->private_data; buffer = kmap(page); offset = page_offset(page); - retval = p9_client_readn(fid, buffer, offset, PAGE_CACHE_SIZE); + retval = v9fs_file_readn(filp, buffer, NULL, offset, PAGE_CACHE_SIZE); if (retval < 0) goto done; diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c index 3819a195de8..4d6d7657fb7 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_9P, "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_read(fid, NULL, 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; diff --git a/include/net/9p/client.h b/include/net/9p/client.h index c70a0f0b448..bb8b0ede132 100644 --- a/include/net/9p/client.h +++ b/include/net/9p/client.h @@ -203,7 +203,6 @@ int p9_client_clunk(struct p9_fid *fid); int p9_client_remove(struct p9_fid *fid); int p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, u32 count); -int p9_client_readn(struct p9_fid *fid, char *data, u64 offset, u32 count); int p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, u64 offset, u32 count); struct p9_stat *p9_client_stat(struct p9_fid *fid); diff --git a/net/9p/client.c b/net/9p/client.c index 5fc3aa1eb39..d5ea042eabb 100644 --- a/net/9p/client.c +++ b/net/9p/client.c @@ -1150,32 +1150,6 @@ error: } EXPORT_SYMBOL(p9_client_write); -int p9_client_readn(struct p9_fid *fid, char *data, u64 offset, u32 count) -{ - int n, total; - - P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, - (long long unsigned) offset, count); - n = 0; - total = 0; - while (count) { - n = p9_client_read(fid, data, NULL, offset, count); - if (n <= 0) - break; - - data += n; - offset += n; - count -= n; - total += n; - } - - if (n < 0) - total = n; - - return total; -} -EXPORT_SYMBOL(p9_client_readn); - static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu) { int n;