lkml.org 
[lkml]   [2006]   [Dec]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 16/35] Unionfs: Copyup Functionality

On Dec 4 2006 07:30, Josef 'Jeff' Sipek wrote:
>+/* Determine the mode based on the copyup flags, and the existing dentry. */
>+static int copyup_permissions(struct super_block *sb,
>+ struct dentry *old_hidden_dentry,
>+ struct dentry *new_hidden_dentry)
>+{
>+ struct inode *i = old_hidden_dentry->d_inode;

Screams for constification. (Or rather I do.)

>+{
>+ int err = 0;
>+ umode_t old_mode = old_hidden_dentry->d_inode->i_mode;

Generel question for everybody: Why do we have two same (at least on i386
that's the case) types, umode_t and mode_t?

>+ } else if (S_ISBLK(old_mode)
>+ || S_ISCHR(old_mode)
>+ || S_ISFIFO(old_mode)
>+ || S_ISSOCK(old_mode)) {
>+ args.mknod.parent = new_hidden_parent_dentry->d_inode;
>+ args.mknod.dentry = new_hidden_dentry;
>+ args.mknod.mode = old_mode;

I'd say the indent got screwed up, and it's not a mailer thing.

>+ } else if (S_ISBLK(old_mode)
>+ || S_ISCHR(old_mode)
>+ || S_ISFIFO(old_mode)
>+ || S_ISSOCK(old_mode)) {
>+ args.mknod.parent = new_hidden_parent_dentry->d_inode;
>+ args.mknod.dentry = new_hidden_dentry;
>+ args.mknod.mode = old_mode;

Try this ^^^. Or even this vvv:

>+ } else if (S_ISBLK(old_mode) || S_ISCHR(old_mode) ||
>+ S_ISFIFO(old_mode) || S_ISSOCK(old_mode)) {
>+ args.mknod.parent = new_hidden_parent_dentry->d_inode;
>+ args.mknod.dentry = new_hidden_dentry;
>+ args.mknod.mode = old_mode;


>+static inline int __copyup_reg_data(struct dentry *dentry,
>+ struct dentry *new_hidden_dentry,
>+ int new_bindex,
>+ struct dentry *old_hidden_dentry,
>+ int old_bindex,
>+ struct file **copyup_file,
>+ loff_t len)
>+{
>+ struct super_block *sb = dentry->d_sb;
>+ struct file *input_file;
>+ struct file *output_file;
>+ mm_segment_t old_fs;
>+ char *buf = NULL;
>+ ssize_t read_bytes, write_bytes;
>+ loff_t size;
>+ int err = 0;
>+
>+ /* open old file */
>+ mntget(unionfs_lower_mnt_idx(dentry, old_bindex));
>+ branchget(sb, old_bindex);
>+ input_file = dentry_open(old_hidden_dentry,
>+ unionfs_lower_mnt_idx(dentry, old_bindex), O_RDONLY | O_LARGEFILE);
>+ if (IS_ERR(input_file)) {
>+ dput(old_hidden_dentry);
>+ err = PTR_ERR(input_file);
>+ goto out;
>+ }
>+ if (!input_file->f_op || !input_file->f_op->read) {
>+ err = -EINVAL;
>+ goto out_close_in;
>+ }
>+
>+ /* open new file */
>+ dget(new_hidden_dentry);
>+ mntget(unionfs_lower_mnt_idx(dentry, new_bindex));
>+ branchget(sb, new_bindex);
>+ output_file = dentry_open(new_hidden_dentry,
>+ unionfs_lower_mnt_idx(dentry, new_bindex), O_WRONLY | O_LARGEFILE);

Here we got an 80-column buster.

>+ if (IS_ERR(output_file)) {
>+ err = PTR_ERR(output_file);
>+ goto out_close_in2;
>+ }
>+ if (!output_file->f_op || !output_file->f_op->write) {
>+ err = -EINVAL;
>+ goto out_close_out;
>+ }
>+
>+ /* allocating a buffer */
>+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
>+ if (!buf) {
>+ err = -ENOMEM;
>+ goto out_close_out;
>+ }
>+
>+ input_file->f_pos = 0;
>+ output_file->f_pos = 0;
>+
>+ old_fs = get_fs();
>+ set_fs(KERNEL_DS);
>+
>+ size = len;
>+ err = 0;
>+ do {
>+ if (len >= PAGE_SIZE)
>+ size = PAGE_SIZE;
>+ else if ((len < PAGE_SIZE) && (len > 0))
>+ size = len;

Some redundant () here.

>+
>+ len -= PAGE_SIZE;
>+
>+ read_bytes =
>+ input_file->f_op->read(input_file,
>+ (char __user *)buf, size,
>+ &input_file->f_pos);
>+ if (read_bytes <= 0) {
>+ err = read_bytes;
>+ break;
>+ }
>+
>+ write_bytes =
>+ output_file->f_op->write(output_file,
>+ (char __user *)buf,
>+ read_bytes,
>+ &output_file->f_pos);
>+ if (write_bytes < 0 || (write_bytes < read_bytes)) {

dit(t)o

>+ err = write_bytes;
>+ break;
>+ }
>+ } while ((read_bytes > 0) && (len > 0));

~

>+
>+ set_fs(old_fs);
>+
>+ kfree(buf);
>+
>+ if (err)
>+ goto out_close_out;
>+ if (copyup_file) {
>+ *copyup_file = output_file;
>+ goto out_close_in;
>+ }
>+
>+out_close_out:
>+ fput(output_file);
>+
>+out_close_in2:
>+ branchput(sb, new_bindex);
>+
>+out_close_in:
>+ fput(input_file);
>+
>+out:
>+ branchput(sb, old_bindex);
>+
>+ return err;
>+}
>+

>+ /* TODO: should we reset the error to something like -EIO? */

Handle it :) - if it does not take a paper.




-`J'
--
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-12-05 22:19    [W:0.196 / U:10.132 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site