[PATCH] [13/13] quota-13-ioctl

This patch implements ioctl() for getting space used by file.
I agree it's ioctl() abuse, it doesn't work on links and has
other ugly properties. Better would be to change 'struct stat'
but changing it just due to this is overkill and it will take
some time before there will be enough changes which will provoke
yet another struct stat :). So this is temporary solution...
If you don't like it, simply reject it. The function it provides
is not fundamental...

So that should be all patches. Any comments (or decision about
including/not including) welcome.
								Honza

fs/ioctl.c

@@ -102,6 +102,16 @@ asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
 				filp->f_flags &= ~FASYNC;
 			break;
 
+		case FIOQSIZE:
+			if (S_ISDIR(filp->f_dentry->d_inode->i_mode) ||
+			    S_ISREG(filp->f_dentry->d_inode->i_mode) ||
+			    S_ISLNK(filp->f_dentry->d_inode->i_mode)) {
+				loff_t res = inode_get_bytes(filp->f_dentry->d_inode);
+				error = copy_to_user((loff_t *)arg, &res, sizeof(res)) ? -EFAULT : 0;
+			}
+			else
+				error = -ENOTTY;
+			break;
 		default:
 			error = -ENOTTY;
 			if (S_ISREG(filp->f_dentry->d_inode->i_mode))

include/asm-alpha/ioctls.h

@@ -9,6 +9,7 @@
 #define FIONBIO		_IOW('f', 126, int)
 #define FIONREAD	_IOR('f', 127, int)
 #define TIOCINQ		FIONREAD
+#define FIOQSIZE	_IOR('f', 128, loff_t)
 
 #define TIOCGETP	_IOR('t', 8, struct sgttyb)
 #define TIOCSETP	_IOW('t', 9, struct sgttyb)

include/asm-cris/ioctls.h

@@ -69,6 +69,7 @@
 #define TIOCGICOUNT	0x545D	/* read serial port inline interrupt counts */
 #define TIOCGHAYESESP   0x545E  /* Get Hayes ESP configuration */
 #define TIOCSHAYESESP   0x545F  /* Set Hayes ESP configuration */
+#define FIOQSIZE	0x5460
 
 /* Used for packet mode */
 #define TIOCPKT_DATA		 0

include/asm-i386/ioctls.h

@@ -67,6 +67,7 @@
 #define TIOCGICOUNT	0x545D	/* read serial port inline interrupt counts */
 #define TIOCGHAYESESP   0x545E  /* Get Hayes ESP configuration */
 #define TIOCSHAYESESP   0x545F  /* Set Hayes ESP configuration */
+#define FIOQSIZE	0x5460
 
 /* Used for packet mode */
 #define TIOCPKT_DATA		 0

include/asm-ia64/ioctls.h

@@ -72,6 +72,7 @@
 #define TIOCGICOUNT	0x545D	/* read serial port inline interrupt counts */
 #define TIOCGHAYESESP   0x545E  /* Get Hayes ESP configuration */
 #define TIOCSHAYESESP   0x545F  /* Set Hayes ESP configuration */
+#define FIOQSIZE	0x5460
 
 /* Used for packet mode */
 #define TIOCPKT_DATA		 0

include/asm-m68k/ioctls.h

@@ -65,6 +65,7 @@
 
 #define TIOCMIWAIT	0x545C	/* wait for a change on serial input line(s) */
 #define TIOCGICOUNT	0x545D	/* read serial port inline interrupt counts */
+#define FIOQSIZE	0x545E
 
 /* Used for packet mode */
 #define TIOCPKT_DATA		 0

include/asm-parisc/ioctls.h

@@ -67,6 +67,7 @@
 #define TIOCGICOUNT	0x545D	/* read serial port inline interrupt counts */
 #define TIOCGHAYESESP   0x545E  /* Get Hayes ESP configuration */
 #define TIOCSHAYESESP   0x545F  /* Set Hayes ESP configuration */
+#define FIOQSIZE	0x5460	/* Get exact space used by quota */
 
 /* Used for packet mode */
 #define TIOCPKT_DATA		 0

include/asm-sh/ioctls.h

@@ -9,6 +9,7 @@
 #define FIONBIO		_IOW('f', 126, int)
 #define FIONREAD	_IOR('f', 127, int)
 #define TIOCINQ		FIONREAD
+#define FIOQSIZE	_IOR('f', 128, loff_t)
 
 #define TCGETS		0x5401
 #define TCSETS		0x5402

include/asm-sparc/ioctls.h

@@ -86,6 +86,7 @@
 #define FIONBIO		_IOW('f', 126, int)
 #define FIONREAD	_IOR('f', 127, int)
 #define TIOCINQ		FIONREAD
+#define FIOQSIZE	_IOR('f', 128, loff_t)
 
 /* SCARY Rutgers local SunOS kernel hackery, perhaps I will support it
  * someday.  This is completely bogus, I know...

include/asm-sparc64/ioctls.h

@@ -87,6 +87,7 @@
 #define FIONBIO		_IOW('f', 126, int)
 #define FIONREAD	_IOR('f', 127, int)
 #define TIOCINQ		FIONREAD
+#define FIOQSIZE	_IOR('f', 128, loff_t)
 
 /* SCARY Rutgers local SunOS kernel hackery, perhaps I will support it
  * someday.  This is completely bogus, I know...