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new helpers: no_seek_end_llseek{,_size}()

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Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2015-12-05 22:04:48 -05:00
commit b25472f9b9
13 changed files with 54 additions and 222 deletions
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15
drivers/s390/char/vmur.c
View file

@ -782,24 +782,11 @@ static int ur_release(struct inode *inode, struct file *file)
static loff_t ur_llseek(struct file *file, loff_t offset, int whence)
{
loff_t newpos;
if ((file->f_flags & O_ACCMODE) != O_RDONLY)
return -ESPIPE; /* seek allowed only for reader */
if (offset % PAGE_SIZE)
return -ESPIPE; /* only multiples of 4K allowed */
switch (whence) {
case 0: /* SEEK_SET */
newpos = offset;
break;
case 1: /* SEEK_CUR */
newpos = file->f_pos + offset;
break;
default:
return -EINVAL;
}
file->f_pos = newpos;
return newpos;
return no_seek_end_llseek(file, offset, whence);
}
static const struct file_operations ur_fops = {

13
drivers/s390/char/zcore.c
View file

@ -385,18 +385,7 @@ static loff_t zcore_lseek(struct file *file, loff_t offset, int orig)
loff_t rc;
mutex_lock(&zcore_mutex);
switch (orig) {
case 0:
file->f_pos = offset;
rc = file->f_pos;
break;
case 1:
file->f_pos += offset;
rc = file->f_pos;
break;
default:
rc = -EINVAL;
}
rc = no_seek_end_llseek(file, offset, orig);
mutex_unlock(&zcore_mutex);
return rc;
}