1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *   Copyright (C) International Business Machines Corp., 2000-2004
57  *	ip	- the inode of the file.
58  *	xlen	- requested extent length.
59  *	pno	- the starting page number with the file.
60  *	xp	- pointer to an xad.  on entry, xad describes an
62  *		  xaddr of the xad is non-zero.  on successful exit,
64  *	abnr	- bool indicating whether the newly allocated extent
68  *	0	- success
69  *	-EIO	- i/o error.
70  *	-ENOSPC	- insufficient disk resources.
73 extAlloc(struct inode *ip, s64 xlen, s64 pno, xad_t * xp, bool abnr)  in extAlloc()  argument
75 	struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);  in extAlloc()
81 	txBeginAnon(ip->i_sb);  in extAlloc()
84 	mutex_lock(&JFS_IP(ip)->commit_mutex);  in extAlloc()
91 	xoff = pno << sbi->l2nbperpage;  in extAlloc()
107 		    abnr == ((xp->flag & XAD_NOTRECORDED) ? true : false))  in extAlloc()
110 		/* adjust the hint to the last block of the extent */  in extAlloc()
111 		hint += (nxlen - 1);  in extAlloc()
120 	 * power of 2 number (i.e. 16 -> 8).  it'll continue to round down  in extAlloc()
125 	if ((rc = extBalloc(ip, hint ? hint : INOHINT(ip), &nxlen, &nxaddr))) {  in extAlloc()
126 		mutex_unlock(&JFS_IP(ip)->commit_mutex);  in extAlloc()
131 	rc = dquot_alloc_block(ip, nxlen);  in extAlloc()
133 		dbFree(ip, nxaddr, (s64) nxlen);  in extAlloc()
134 		mutex_unlock(&JFS_IP(ip)->commit_mutex);  in extAlloc()
146 		rc = xtExtend(0, ip, xoff, (int) nxlen, 0);  in extAlloc()
148 		rc = xtInsert(0, ip, xflag, xoff, (int) nxlen, &nxaddr, 0);  in extAlloc()
154 		dbFree(ip, nxaddr, nxlen);  in extAlloc()
155 		dquot_free_block(ip, nxlen);  in extAlloc()
156 		mutex_unlock(&JFS_IP(ip)->commit_mutex);  in extAlloc()
164 	xp->flag = xflag;  in extAlloc()
166 	mark_inode_dirty(ip);  in extAlloc()
168 	mutex_unlock(&JFS_IP(ip)->commit_mutex);  in extAlloc()
174 	if (test_and_clear_cflag(COMMIT_Synclist,ip))  in extAlloc()
175 		jfs_commit_inode(ip, 0);  in extAlloc()
189  *	ip	- the inode of the file.
190  *	cp	- cbuf for the partial backed last page.
191  *	xlen	- request size of the resulting extent.
192  *	xp	- pointer to an xad. on successful exit, the xad
194  *	abnr	- bool indicating whether the newly allocated extent
198  *	0	- success
199  *	-EIO	- i/o error.
200  *	-ENOSPC	- insufficient disk resources.
202 int extRealloc(struct inode *ip, s64 nxlen, xad_t * xp, bool abnr)  in extRealloc()  argument
204 	struct super_block *sb = ip->i_sb;  in extRealloc()
207 	int rc, nbperpage = JFS_SBI(sb)->nbperpage;  in extRealloc()
211 	txBeginAnon(ip->i_sb);  in extRealloc()
213 	mutex_lock(&JFS_IP(ip)->commit_mutex);  in extRealloc()
218 	/* get the extend (partial) page's disk block address and  in extRealloc()
229 	if ((xp->flag & XAD_NOTRECORDED) && !abnr) {  in extRealloc()
230 		xp->flag = 0;  in extRealloc()
231 		if ((rc = xtUpdate(0, ip, xp)))  in extRealloc()
243 	if ((rc = extBrealloc(ip, xaddr, xlen, &nxlen, &nxaddr)))  in extRealloc()
247 	rc = dquot_alloc_block(ip, nxlen);  in extRealloc()
249 		dbFree(ip, nxaddr, (s64) nxlen);  in extRealloc()
250 		mutex_unlock(&JFS_IP(ip)->commit_mutex);  in extRealloc()
254 	delta = nxlen - xlen;  in extRealloc()
267 	if (abnr && (!(xp->flag & XAD_NOTRECORDED)) && (nxlen > nbperpage)) {  in extRealloc()
269 		nextend = ntail - xlen;  in extRealloc()
270 		ninsert = nxlen - nbperpage;  in extRealloc()
278 		xflag = xp->flag;  in extRealloc()
287 		if ((rc = xtExtend(0, ip, xoff + xlen, (int) nextend, 0))) {  in extRealloc()
288 			dbFree(ip, xaddr + xlen, delta);  in extRealloc()
289 			dquot_free_block(ip, nxlen);  in extRealloc()
298 		if ((rc = xtTailgate(0, ip, xoff, (int) ntail, nxaddr, 0))) {  in extRealloc()
299 			dbFree(ip, nxaddr, nxlen);  in extRealloc()
300 			dquot_free_block(ip, nxlen);  in extRealloc()
313 		if (xtInsert (0, ip, xflag, xoff + ntail, (int) ninsert,  in extRealloc()
315 			dbFree(ip, xaddr, (s64) ninsert);  in extRealloc()
326 	xp->flag = xflag;  in extRealloc()
328 	mark_inode_dirty(ip);  in extRealloc()
330 	mutex_unlock(&JFS_IP(ip)->commit_mutex);  in extRealloc()
342  *	ip	- the inode of the file.
343  *	offset  - file offset for which the hint is needed.
344  *	xp	- pointer to the xad that is to be filled in with
348  *	0	- success
349  *	-EIO	- i/o error.
351 int extHint(struct inode *ip, s64 offset, xad_t * xp)  in extHint()  argument
353 	struct super_block *sb = ip->i_sb;  in extHint()
354 	int nbperpage = JFS_SBI(sb)->nbperpage;  in extHint()
367 	prev = ((offset & ~POFFSET) >> JFS_SBI(sb)->l2bsize) - nbperpage;  in extHint()
374 	rc = xtLookup(ip, prev, nbperpage, &xflag, &xaddr, &xlen, 0);  in extHint()
378 			jfs_error(ip->i_sb, "corrupt xtree\n");  in extHint()
379 			rc = -EIO;  in extHint()
388 		xp->flag  = xflag & XAD_NOTRECORDED;  in extHint()
403  *	ip	- inode of the file.
404  *	cp	- cbuf of the file page.
407  *	0	- success
408  *	-EIO	- i/o error.
409  *	-ENOSPC	- insufficient disk resources.
411 int extRecord(struct inode *ip, xad_t * xp)  in extRecord()  argument
415 	txBeginAnon(ip->i_sb);  in extRecord()
417 	mutex_lock(&JFS_IP(ip)->commit_mutex);  in extRecord()
420 	rc = xtUpdate(0, ip, xp);  in extRecord()
422 	mutex_unlock(&JFS_IP(ip)->commit_mutex);  in extRecord()
435  *	ip	- the inode of the file.
436  *	cp	- cbuf of the file page represent the hole.
439  *	0	- success
440  *	-EIO	- i/o error.
441  *	-ENOSPC	- insufficient disk resources.
443 int extFill(struct inode *ip, xad_t * xp)  in extFill()  argument
445 	int rc, nbperpage = JFS_SBI(ip->i_sb)->nbperpage;  in extFill()
446 	s64 blkno = offsetXAD(xp) >> ip->i_blkbits;  in extFill()
448 //	assert(ISSPARSE(ip));  in extFill()
454 	if ((rc = extAlloc(ip, nbperpage, blkno, xp, false)))  in extFill()
475  *		number (i.e. 16 -> 8).  we'll continue to round down and
480  *	ip	 - the inode of the file.
481  *	hint	 - disk block number to be used as an allocation hint.
482  *	*nblocks - pointer to an s64 value.  on entry, this value specifies
483  *		   the desired number of block to be allocated. on successful
486  *	blkno	 - pointer to a block address that is filled in on successful
487  *		   return with the starting block number of the newly
488  *		   allocated block range.
491  *	0	- success
492  *	-EIO	- i/o error.
493  *	-ENOSPC	- insufficient disk resources.
496 extBalloc(struct inode *ip, s64 hint, s64 * nblocks, s64 * blkno)  in extBalloc()  argument
498 	struct jfs_inode_info *ji = JFS_IP(ip);  in extBalloc()
499 	struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);  in extBalloc()
501 	int rc, nbperpage = sbi->nbperpage;  in extBalloc()
502 	struct bmap *bmp = sbi->bmap;  in extBalloc()
511 	max = (s64) 1 << bmp->db_maxfreebud;  in extBalloc()
518 	while ((rc = dbAlloc(ip, hint, nb, &daddr)) != 0) {  in extBalloc()
522 		if (rc != -ENOSPC)  in extBalloc()
536 	if (S_ISREG(ip->i_mode) && (ji->fileset == FILESYSTEM_I)) {  in extBalloc()
538 		spin_lock_irq(&ji->ag_lock);  in extBalloc()
539 		if (ji->active_ag == -1) {  in extBalloc()
540 			atomic_inc(&bmp->db_active[ag]);  in extBalloc()
541 			ji->active_ag = ag;  in extBalloc()
542 		} else if (ji->active_ag != ag) {  in extBalloc()
543 			atomic_dec(&bmp->db_active[ji->active_ag]);  in extBalloc()
544 			atomic_inc(&bmp->db_active[ag]);  in extBalloc()
545 			ji->active_ag = ag;  in extBalloc()
547 		spin_unlock_irq(&ji->ag_lock);  in extBalloc()
569  *		number (i.e. 16 -> 8).  We'll continue to round down and
574  *	ip	 - the inode of the file.
575  *	blkno	 - starting block number of the extents current allocation.
576  *	nblks	 - number of blocks within the extents current allocation.
577  *	newnblks - pointer to a s64 value.  on entry, this value is the
581  *	newblkno - the starting block number of the extents new allocation.
584  *	0	- success
585  *	-EIO	- i/o error.
586  *	-ENOSPC	- insufficient disk resources.
589 extBrealloc(struct inode *ip,  in extBrealloc()  argument
595 	if ((rc = dbExtend(ip, blkno, nblks, *newnblks - nblks)) == 0) {  in extBrealloc()
599 		if (rc != -ENOSPC)  in extBrealloc()
606 	return (extBalloc(ip, blkno, newnblks, newblkno));  in extBrealloc()
618  *	nb	- the inode of the file.
633 	i = 63 - i;  in extRoundDown()
635 	k = ((k - 1) & nb) ? k : k >> 1;  in extRoundDown()