diff options
Diffstat (limited to 'fs/ncpfs/file.c')
| -rw-r--r-- | fs/ncpfs/file.c | 300 |
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, +}; |
