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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/ncpfs/file.c
downloadop-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/ncpfs/file.c')
-rw-r--r--fs/ncpfs/file.c300
1 files changed, 300 insertions, 0 deletions
diff --git a/fs/ncpfs/file.c b/fs/ncpfs/file.c
new file mode 100644
index 0000000..4947d9b
--- /dev/null
+++ b/fs/ncpfs/file.c
@@ -0,0 +1,300 @@
+/*
+ * file.c
+ *
+ * Copyright (C) 1995, 1996 by Volker Lendecke
+ * Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
+ *
+ */
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+#include <linux/time.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/stat.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/smp_lock.h>
+
+#include <linux/ncp_fs.h>
+#include "ncplib_kernel.h"
+
+static int ncp_fsync(struct file *file, struct dentry *dentry, int datasync)
+{
+ return 0;
+}
+
+/*
+ * Open a file with the specified read/write mode.
+ */
+int ncp_make_open(struct inode *inode, int right)
+{
+ int error;
+ int access;
+
+ error = -EINVAL;
+ if (!inode) {
+ printk(KERN_ERR "ncp_make_open: got NULL inode\n");
+ goto out;
+ }
+
+ DPRINTK("ncp_make_open: opened=%d, volume # %u, dir entry # %u\n",
+ atomic_read(&NCP_FINFO(inode)->opened),
+ NCP_FINFO(inode)->volNumber,
+ NCP_FINFO(inode)->dirEntNum);
+ error = -EACCES;
+ down(&NCP_FINFO(inode)->open_sem);
+ if (!atomic_read(&NCP_FINFO(inode)->opened)) {
+ struct ncp_entry_info finfo;
+ int result;
+
+ /* tries max. rights */
+ finfo.access = O_RDWR;
+ result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
+ inode, NULL, OC_MODE_OPEN,
+ 0, AR_READ | AR_WRITE, &finfo);
+ if (!result)
+ goto update;
+ /* RDWR did not succeeded, try readonly or writeonly as requested */
+ switch (right) {
+ case O_RDONLY:
+ finfo.access = O_RDONLY;
+ result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
+ inode, NULL, OC_MODE_OPEN,
+ 0, AR_READ, &finfo);
+ break;
+ case O_WRONLY:
+ finfo.access = O_WRONLY;
+ result = ncp_open_create_file_or_subdir(NCP_SERVER(inode),
+ inode, NULL, OC_MODE_OPEN,
+ 0, AR_WRITE, &finfo);
+ break;
+ }
+ if (result) {
+ PPRINTK("ncp_make_open: failed, result=%d\n", result);
+ goto out_unlock;
+ }
+ /*
+ * Update the inode information.
+ */
+ update:
+ ncp_update_inode(inode, &finfo);
+ atomic_set(&NCP_FINFO(inode)->opened, 1);
+ }
+
+ access = NCP_FINFO(inode)->access;
+ PPRINTK("ncp_make_open: file open, access=%x\n", access);
+ if (access == right || access == O_RDWR) {
+ atomic_inc(&NCP_FINFO(inode)->opened);
+ error = 0;
+ }
+
+out_unlock:
+ up(&NCP_FINFO(inode)->open_sem);
+out:
+ return error;
+}
+
+static ssize_t
+ncp_file_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+{
+ struct dentry *dentry = file->f_dentry;
+ struct inode *inode = dentry->d_inode;
+ size_t already_read = 0;
+ off_t pos;
+ size_t bufsize;
+ int error;
+ void* freepage;
+ size_t freelen;
+
+ DPRINTK("ncp_file_read: enter %s/%s\n",
+ dentry->d_parent->d_name.name, dentry->d_name.name);
+
+ if (!ncp_conn_valid(NCP_SERVER(inode)))
+ return -EIO;
+
+ pos = *ppos;
+
+ if ((ssize_t) count < 0) {
+ return -EINVAL;
+ }
+ if (!count)
+ return 0;
+ if (pos > inode->i_sb->s_maxbytes)
+ return 0;
+ if (pos + count > inode->i_sb->s_maxbytes) {
+ count = inode->i_sb->s_maxbytes - pos;
+ }
+
+ error = ncp_make_open(inode, O_RDONLY);
+ if (error) {
+ DPRINTK(KERN_ERR "ncp_file_read: open failed, error=%d\n", error);
+ return error;
+ }
+
+ bufsize = NCP_SERVER(inode)->buffer_size;
+
+ error = -EIO;
+ freelen = ncp_read_bounce_size(bufsize);
+ freepage = vmalloc(freelen);
+ if (!freepage)
+ goto outrel;
+ error = 0;
+ /* First read in as much as possible for each bufsize. */
+ while (already_read < count) {
+ int read_this_time;
+ size_t to_read = min_t(unsigned int,
+ bufsize - (pos % bufsize),
+ count - already_read);
+
+ error = ncp_read_bounce(NCP_SERVER(inode),
+ NCP_FINFO(inode)->file_handle,
+ pos, to_read, buf, &read_this_time,
+ freepage, freelen);
+ if (error) {
+ error = -EIO; /* NW errno -> Linux errno */
+ break;
+ }
+ pos += read_this_time;
+ buf += read_this_time;
+ already_read += read_this_time;
+
+ if (read_this_time != to_read) {
+ break;
+ }
+ }
+ vfree(freepage);
+
+ *ppos = pos;
+
+ file_accessed(file);
+
+ DPRINTK("ncp_file_read: exit %s/%s\n",
+ dentry->d_parent->d_name.name, dentry->d_name.name);
+outrel:
+ ncp_inode_close(inode);
+ return already_read ? already_read : error;
+}
+
+static ssize_t
+ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+{
+ struct dentry *dentry = file->f_dentry;
+ struct inode *inode = dentry->d_inode;
+ size_t already_written = 0;
+ off_t pos;
+ size_t bufsize;
+ int errno;
+ void* bouncebuffer;
+
+ DPRINTK("ncp_file_write: enter %s/%s\n",
+ dentry->d_parent->d_name.name, dentry->d_name.name);
+ if (!ncp_conn_valid(NCP_SERVER(inode)))
+ return -EIO;
+ if ((ssize_t) count < 0)
+ return -EINVAL;
+ pos = *ppos;
+ if (file->f_flags & O_APPEND) {
+ pos = inode->i_size;
+ }
+
+ if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) {
+ if (pos >= MAX_NON_LFS) {
+ send_sig(SIGXFSZ, current, 0);
+ return -EFBIG;
+ }
+ if (count > MAX_NON_LFS - (u32)pos) {
+ count = MAX_NON_LFS - (u32)pos;
+ }
+ }
+ if (pos >= inode->i_sb->s_maxbytes) {
+ if (count || pos > inode->i_sb->s_maxbytes) {
+ send_sig(SIGXFSZ, current, 0);
+ return -EFBIG;
+ }
+ }
+ if (pos + count > inode->i_sb->s_maxbytes) {
+ count = inode->i_sb->s_maxbytes - pos;
+ }
+
+ if (!count)
+ return 0;
+ errno = ncp_make_open(inode, O_WRONLY);
+ if (errno) {
+ DPRINTK(KERN_ERR "ncp_file_write: open failed, error=%d\n", errno);
+ return errno;
+ }
+ bufsize = NCP_SERVER(inode)->buffer_size;
+
+ already_written = 0;
+
+ bouncebuffer = vmalloc(bufsize);
+ if (!bouncebuffer) {
+ errno = -EIO; /* -ENOMEM */
+ goto outrel;
+ }
+ while (already_written < count) {
+ int written_this_time;
+ size_t to_write = min_t(unsigned int,
+ bufsize - (pos % bufsize),
+ count - already_written);
+
+ if (copy_from_user(bouncebuffer, buf, to_write)) {
+ errno = -EFAULT;
+ break;
+ }
+ if (ncp_write_kernel(NCP_SERVER(inode),
+ NCP_FINFO(inode)->file_handle,
+ pos, to_write, bouncebuffer, &written_this_time) != 0) {
+ errno = -EIO;
+ break;
+ }
+ pos += written_this_time;
+ buf += written_this_time;
+ already_written += written_this_time;
+
+ if (written_this_time != to_write) {
+ break;
+ }
+ }
+ vfree(bouncebuffer);
+
+ inode_update_time(inode, 1);
+
+ *ppos = pos;
+
+ if (pos > inode->i_size) {
+ inode->i_size = pos;
+ }
+ DPRINTK("ncp_file_write: exit %s/%s\n",
+ dentry->d_parent->d_name.name, dentry->d_name.name);
+outrel:
+ ncp_inode_close(inode);
+ return already_written ? already_written : errno;
+}
+
+static int ncp_release(struct inode *inode, struct file *file) {
+ if (ncp_make_closed(inode)) {
+ DPRINTK("ncp_release: failed to close\n");
+ }
+ return 0;
+}
+
+struct file_operations ncp_file_operations =
+{
+ .llseek = remote_llseek,
+ .read = ncp_file_read,
+ .write = ncp_file_write,
+ .ioctl = ncp_ioctl,
+ .mmap = ncp_mmap,
+ .release = ncp_release,
+ .fsync = ncp_fsync,
+};
+
+struct inode_operations ncp_file_inode_operations =
+{
+ .setattr = ncp_notify_change,
+};
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