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/*
* Copyright (C) International Business Machines Corp., 2000-2004
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/fs.h>
#include <linux/quotaops.h>
#include "jfs_incore.h"
#include "jfs_inode.h"
#include "jfs_superblock.h"
#include "jfs_dmap.h"
#include "jfs_extent.h"
#include "jfs_debug.h"
/*
* forward references
*/
static int extBalloc(struct inode *, s64, s64 *, s64 *);
#ifdef _NOTYET
static int extBrealloc(struct inode *, s64, s64, s64 *, s64 *);
#endif
static s64 extRoundDown(s64 nb);
#define DPD(a) (printk("(a): %d\n",(a)))
#define DPC(a) (printk("(a): %c\n",(a)))
#define DPL1(a) \
{ \
if ((a) >> 32) \
printk("(a): %x%08x ",(a)); \
else \
printk("(a): %x ",(a) << 32); \
}
#define DPL(a) \
{ \
if ((a) >> 32) \
printk("(a): %x%08x\n",(a)); \
else \
printk("(a): %x\n",(a) << 32); \
}
#define DPD1(a) (printk("(a): %d ",(a)))
#define DPX(a) (printk("(a): %08x\n",(a)))
#define DPX1(a) (printk("(a): %08x ",(a)))
#define DPS(a) (printk("%s\n",(a)))
#define DPE(a) (printk("\nENTERING: %s\n",(a)))
#define DPE1(a) (printk("\nENTERING: %s",(a)))
#define DPS1(a) (printk(" %s ",(a)))
/*
* NAME: extAlloc()
*
* FUNCTION: allocate an extent for a specified page range within a
* file.
*
* PARAMETERS:
* ip - the inode of the file.
* xlen - requested extent length.
* pno - the starting page number with the file.
* xp - pointer to an xad. on entry, xad describes an
* extent that is used as an allocation hint if the
* xaddr of the xad is non-zero. on successful exit,
* the xad describes the newly allocated extent.
* abnr - bool indicating whether the newly allocated extent
* should be marked as allocated but not recorded.
*
* RETURN VALUES:
* 0 - success
* -EIO - i/o error.
* -ENOSPC - insufficient disk resources.
*/
int
extAlloc(struct inode *ip, s64 xlen, s64 pno, xad_t * xp, bool abnr)
{
struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
s64 nxlen, nxaddr, xoff, hint, xaddr = 0;
int rc;
int xflag;
/* This blocks if we are low on resources */
txBeginAnon(ip->i_sb);
/* Avoid race with jfs_commit_inode() */
mutex_lock(&JFS_IP(ip)->commit_mutex);
/* validate extent length */
if (xlen > MAXXLEN)
xlen = MAXXLEN;
/* get the page's starting extent offset */
xoff = pno << sbi->l2nbperpage;
/* check if an allocation hint was provided */
if ((hint = addressXAD(xp))) {
/* get the size of the extent described by the hint */
nxlen = lengthXAD(xp);
/* check if the hint is for the portion of the file
* immediately previous to the current allocation
* request and if hint extent has the same abnr
* value as the current request. if so, we can
* extend the hint extent to include the current
* extent if we can allocate the blocks immediately
* following the hint extent.
*/
if (offsetXAD(xp) + nxlen == xoff &&
abnr == ((xp->flag & XAD_NOTRECORDED) ? true : false))
xaddr = hint + nxlen;
/* adjust the hint to the last block of the extent */
hint += (nxlen - 1);
}
/* allocate the disk blocks for the extent. initially, extBalloc()
* will try to allocate disk blocks for the requested size (xlen).
* if this fails (xlen contiguous free blocks not avaliable), it'll
* try to allocate a smaller number of blocks (producing a smaller
* extent), with this smaller number of blocks consisting of the
* requested number of blocks rounded down to the next smaller
* power of 2 number (i.e. 16 -> 8). it'll continue to round down
* and retry the allocation until the number of blocks to allocate
* is smaller than the number of blocks per page.
*/
nxlen = xlen;
if ((rc = extBalloc(ip, hint ? hint : INOHINT(ip), &nxlen, &nxaddr))) {
mutex_unlock(&JFS_IP(ip)->commit_mutex);
return (rc);
}
/* Allocate blocks to quota. */
rc = dquot_alloc_block(ip, nxlen);
if (rc) {
dbFree(ip, nxaddr, (s64) nxlen);
mutex_unlock(&JFS_IP(ip)->commit_mutex);
return rc;
}
/* determine the value of the extent flag */
xflag = abnr ? XAD_NOTRECORDED : 0;
/* if we can extend the hint extent to cover the current request,
* extend it. otherwise, insert a new extent to
* cover the current request.
*/
if (xaddr && xaddr == nxaddr)
rc = xtExtend(0, ip, xoff, (int) nxlen, 0);
else
rc = xtInsert(0, ip, xflag, xoff, (int) nxlen, &nxaddr, 0);
/* if the extend or insert failed,
* free the newly allocated blocks and return the error.
*/
if (rc) {
dbFree(ip, nxaddr, nxlen);
dquot_free_block(ip, nxlen);
mutex_unlock(&JFS_IP(ip)->commit_mutex);
return (rc);
}
/* set the results of the extent allocation */
XADaddress(xp, nxaddr);
XADlength(xp, nxlen);
XADoffset(xp, xoff);
xp->flag = xflag;
mark_inode_dirty(ip);
mutex_unlock(&JFS_IP(ip)->commit_mutex);
/*
* COMMIT_SyncList flags an anonymous tlock on page that is on
* sync list.
* We need to commit the inode to get the page written disk.
*/
if (test_and_clear_cflag(COMMIT_Synclist,ip))
jfs_commit_inode(ip, 0);
return (0);
}
#ifdef _NOTYET
/*
* NAME: extRealloc()
*
* FUNCTION: extend the allocation of a file extent containing a
* partial back last page.
*
* PARAMETERS:
* ip - the inode of the file.
* cp - cbuf for the partial backed last page.
* xlen - request size of the resulting extent.
* xp - pointer to an xad. on successful exit, the xad
* describes the newly allocated extent.
* abnr - bool indicating whether the newly allocated extent
* should be marked as allocated but not recorded.
*
* RETURN VALUES:
* 0 - success
* -EIO - i/o error.
* -ENOSPC - insufficient disk resources.
*/
int extRealloc(struct inode *ip, s64 nxlen, xad_t * xp, bool abnr)
{
struct super_block *sb = ip->i_sb;
s64 xaddr, xlen, nxaddr, delta, xoff;
s64 ntail, nextend, ninsert;
int rc, nbperpage = JFS_SBI(sb)->nbperpage;
int xflag;
/* This blocks if we are low on resources */
txBeginAnon(ip->i_sb);
mutex_lock(&JFS_IP(ip)->commit_mutex);
/* validate extent length */
if (nxlen > MAXXLEN)
nxlen = MAXXLEN;
/* get the extend (partial) page's disk block address and
* number of blocks.
*/
xaddr = addressXAD(xp);
xlen = lengthXAD(xp);
xoff = offsetXAD(xp);
/* if the extend page is abnr and if the request is for
* the extent to be allocated and recorded,
* make the page allocated and recorded.
*/
if ((xp->flag & XAD_NOTRECORDED) && !abnr) {
xp->flag = 0;
if ((rc = xtUpdate(0, ip, xp)))
goto exit;
}
/* try to allocated the request number of blocks for the
* extent. dbRealloc() first tries to satisfy the request
* by extending the allocation in place. otherwise, it will
* try to allocate a new set of blocks large enough for the
* request. in satisfying a request, dbReAlloc() may allocate
* less than what was request but will always allocate enough
* space as to satisfy the extend page.
*/
if ((rc = extBrealloc(ip, xaddr, xlen, &nxlen, &nxaddr)))
goto exit;
/* Allocat blocks to quota. */
rc = dquot_alloc_block(ip, nxlen);
if (rc) {
dbFree(ip, nxaddr, (s64) nxlen);
mutex_unlock(&JFS_IP(ip)->commit_mutex);
return rc;
}
delta = nxlen - xlen;
/* check if the extend page is not abnr but the request is abnr
* and the allocated disk space is for more than one page. if this
* is the case, there is a miss match of abnr between the extend page
* and the one or more pages following the extend page. as a result,
* two extents will have to be manipulated. the first will be that
* of the extent of the extend page and will be manipulated thru
* an xtExtend() or an xtTailgate(), depending upon whether the
* disk allocation occurred as an inplace extension. the second
* extent will be manipulated (created) through an xtInsert() and
* will be for the pages following the extend page.
*/
if (abnr && (!(xp->flag
|