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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /fs/ncpfs/file.c
Initial import
Diffstat (limited to 'fs/ncpfs/file.c')
-rw-r--r--fs/ncpfs/file.c262
1 files changed, 262 insertions, 0 deletions
diff --git a/fs/ncpfs/file.c b/fs/ncpfs/file.c
new file mode 100644
index 000000000..011324ce9
--- /dev/null
+++ b/fs/ncpfs/file.c
@@ -0,0 +1,262 @@
+/*
+ * file.c
+ *
+ * Copyright (C) 1995, 1996 by Volker Lendecke
+ * Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <asm/uaccess.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/vmalloc.h>
+#include <linux/sched.h>
+
+#include "ncp_fs.h"
+
+static int ncp_fsync(struct file *file, loff_t start, loff_t end, int datasync)
+{
+ return filemap_write_and_wait_range(file->f_mapping, start, end);
+}
+
+/*
+ * 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) {
+ pr_err("%s: got NULL inode\n", __func__);
+ goto out;
+ }
+
+ ncp_dbg(1, "opened=%d, volume # %u, dir entry # %u\n",
+ atomic_read(&NCP_FINFO(inode)->opened),
+ NCP_FINFO(inode)->volNumber,
+ NCP_FINFO(inode)->dirEntNum);
+ error = -EACCES;
+ mutex_lock(&NCP_FINFO(inode)->open_mutex);
+ 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) {
+ ncp_vdbg("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;
+ ncp_vdbg("file open, access=%x\n", access);
+ if (access == right || access == O_RDWR) {
+ atomic_inc(&NCP_FINFO(inode)->opened);
+ error = 0;
+ }
+
+out_unlock:
+ mutex_unlock(&NCP_FINFO(inode)->open_mutex);
+out:
+ return error;
+}
+
+static ssize_t
+ncp_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
+{
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file_inode(file);
+ size_t already_read = 0;
+ off_t pos = iocb->ki_pos;
+ size_t bufsize;
+ int error;
+ void *freepage;
+ size_t freelen;
+
+ ncp_dbg(1, "enter %pD2\n", file);
+
+ if (!iov_iter_count(to))
+ return 0;
+ if (pos > inode->i_sb->s_maxbytes)
+ return 0;
+ iov_iter_truncate(to, inode->i_sb->s_maxbytes - pos);
+
+ error = ncp_make_open(inode, O_RDONLY);
+ if (error) {
+ ncp_dbg(1, "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 (iov_iter_count(to)) {
+ int read_this_time;
+ size_t to_read = min_t(size_t,
+ bufsize - (pos % bufsize),
+ iov_iter_count(to));
+
+ error = ncp_read_bounce(NCP_SERVER(inode),
+ NCP_FINFO(inode)->file_handle,
+ pos, to_read, to, &read_this_time,
+ freepage, freelen);
+ if (error) {
+ error = -EIO; /* NW errno -> Linux errno */
+ break;
+ }
+ pos += read_this_time;
+ already_read += read_this_time;
+
+ if (read_this_time != to_read)
+ break;
+ }
+ vfree(freepage);
+
+ iocb->ki_pos = pos;
+
+ file_accessed(file);
+
+ ncp_dbg(1, "exit %pD2\n", file);
+outrel:
+ ncp_inode_close(inode);
+ return already_read ? already_read : error;
+}
+
+static ssize_t
+ncp_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
+{
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file_inode(file);
+ size_t already_written = 0;
+ size_t bufsize;
+ int errno;
+ void *bouncebuffer;
+ off_t pos;
+
+ ncp_dbg(1, "enter %pD2\n", file);
+ errno = generic_write_checks(iocb, from);
+ if (errno <= 0)
+ return errno;
+
+ errno = ncp_make_open(inode, O_WRONLY);
+ if (errno) {
+ ncp_dbg(1, "open failed, error=%d\n", errno);
+ return errno;
+ }
+ bufsize = NCP_SERVER(inode)->buffer_size;
+
+ errno = file_update_time(file);
+ if (errno)
+ goto outrel;
+
+ bouncebuffer = vmalloc(bufsize);
+ if (!bouncebuffer) {
+ errno = -EIO; /* -ENOMEM */
+ goto outrel;
+ }
+ pos = iocb->ki_pos;
+ while (iov_iter_count(from)) {
+ int written_this_time;
+ size_t to_write = min_t(size_t,
+ bufsize - (pos % bufsize),
+ iov_iter_count(from));
+
+ if (copy_from_iter(bouncebuffer, to_write, from) != 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;
+ already_written += written_this_time;
+
+ if (written_this_time != to_write)
+ break;
+ }
+ vfree(bouncebuffer);
+
+ iocb->ki_pos = pos;
+
+ if (pos > i_size_read(inode)) {
+ mutex_lock(&inode->i_mutex);
+ if (pos > i_size_read(inode))
+ i_size_write(inode, pos);
+ mutex_unlock(&inode->i_mutex);
+ }
+ ncp_dbg(1, "exit %pD2\n", file);
+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)) {
+ ncp_dbg(1, "failed to close\n");
+ }
+ return 0;
+}
+
+const struct file_operations ncp_file_operations =
+{
+ .llseek = generic_file_llseek,
+ .read_iter = ncp_file_read_iter,
+ .write_iter = ncp_file_write_iter,
+ .unlocked_ioctl = ncp_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = ncp_compat_ioctl,
+#endif
+ .mmap = ncp_mmap,
+ .release = ncp_release,
+ .fsync = ncp_fsync,
+};
+
+const struct inode_operations ncp_file_inode_operations =
+{
+ .setattr = ncp_notify_change,
+};