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locks: create posix-to-flock helper functions

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Factor out a bit of messy code by creating posix-to-flock counterparts
to the existing flock-to-posix helper functions.

Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
This commit is contained in:
J. Bruce Fields 2007-02-20 16:10:11 -05:00
parent 226a998dbf
commit c2fa1b8a6c
1 changed files with 36 additions and 25 deletions
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61
fs/locks.c
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@ -1611,6 +1611,38 @@ asmlinkage long sys_flock(unsigned int fd, unsigned int cmd)
return error;
}
static int posix_lock_to_flock(struct flock *flock, struct file_lock *fl)
{
flock->l_pid = fl->fl_pid;
#if BITS_PER_LONG == 32
/*
* Make sure we can represent the posix lock via
* legacy 32bit flock.
*/
if (fl->fl_start > OFFT_OFFSET_MAX)
return -EOVERFLOW;
if (fl->fl_end != OFFSET_MAX && fl->fl_end > OFFT_OFFSET_MAX)
return -EOVERFLOW;
#endif
flock->l_start = fl->fl_start;
flock->l_len = fl->fl_end == OFFSET_MAX ? 0 :
fl->fl_end - fl->fl_start + 1;
flock->l_whence = 0;
return 0;
}
#if BITS_PER_LONG == 32
static void posix_lock_to_flock64(struct flock64 *flock, struct file_lock *fl)
{
flock->l_pid = fl->fl_pid;
flock->l_start = fl->fl_start;
flock->l_len = fl->fl_end == OFFSET_MAX ? 0 :
fl->fl_end - fl->fl_start + 1;
flock->l_whence = 0;
flock->l_type = fl->fl_type;
}
#endif
/* Report the first existing lock that would conflict with l.
* This implements the F_GETLK command of fcntl().
*/
@ -1645,24 +1677,9 @@ int fcntl_getlk(struct file *filp, struct flock __user *l)
flock.l_type = F_UNLCK;
if (fl != NULL) {
flock.l_pid = fl->fl_pid;
#if BITS_PER_LONG == 32
/*
* Make sure we can represent the posix lock via
* legacy 32bit flock.
*/
error = -EOVERFLOW;
if (fl->fl_start > OFFT_OFFSET_MAX)
error = posix_lock_to_flock(&flock, fl);
if (error)
goto out;
if ((fl->fl_end != OFFSET_MAX)
&& (fl->fl_end > OFFT_OFFSET_MAX))
goto out;
#endif
flock.l_start = fl->fl_start;
flock.l_len = fl->fl_end == OFFSET_MAX ? 0 :
fl->fl_end - fl->fl_start + 1;
flock.l_whence = 0;
flock.l_type = fl->fl_type;
}
error = -EFAULT;
if (!copy_to_user(l, &flock, sizeof(flock)))
@ -1798,14 +1815,8 @@ int fcntl_getlk64(struct file *filp, struct flock64 __user *l)
}
flock.l_type = F_UNLCK;
if (fl != NULL) {
flock.l_pid = fl->fl_pid;
flock.l_start = fl->fl_start;
flock.l_len = fl->fl_end == OFFSET_MAX ? 0 :
fl->fl_end - fl->fl_start + 1;
flock.l_whence = 0;
flock.l_type = fl->fl_type;
}
if (fl != NULL)
posix_lock_to_flock64(&flock, fl);
error = -EFAULT;
if (!copy_to_user(l, &flock, sizeof(flock)))
error = 0;