1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *   Copyright (C) International Business Machines Corp., 2000-2004
54  *	ip	- the inode of the file.
55  *	xlen	- requested extent length.
56  *	pno	- the starting page number with the file.
57  *	xp	- pointer to an xad.  on entry, xad describes an
59  *		  xaddr of the xad is non-zero.  on successful exit,
61  *	abnr	- bool indicating whether the newly allocated extent
65  *	0	- success
66  *	-EIO	- i/o error.
67  *	-ENOSPC	- insufficient disk resources.
70 extAlloc(struct inode *ip, s64 xlen, s64 pno, xad_t * xp, bool abnr)  in extAlloc()  argument
72 	struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);  in extAlloc()
78 		jfs_error(ip->i_sb, "read-only filesystem\n");  in extAlloc()
79 		return -EIO;  in extAlloc()
83 	txBeginAnon(ip->i_sb);  in extAlloc()
86 	mutex_lock(&JFS_IP(ip)->commit_mutex);  in extAlloc()
89 	if (xlen > MAXXLEN)  in extAlloc()
90 		xlen = MAXXLEN;  in extAlloc()
93 	xoff = pno << sbi->l2nbperpage;  in extAlloc()
109 		    abnr == ((xp->flag & XAD_NOTRECORDED) ? true : false))  in extAlloc()
113 		hint += (nxlen - 1);  in extAlloc()
117 	 * will try to allocate disk blocks for the requested size (xlen).  in extAlloc()
118 	 * if this fails (xlen contiguous free blocks not available), it'll  in extAlloc()
122 	 * power of 2 number (i.e. 16 -> 8).  it'll continue to round down  in extAlloc()
126 	nxlen = xlen;  in extAlloc()
128 		mutex_unlock(&JFS_IP(ip)->commit_mutex);  in extAlloc()
136 		mutex_unlock(&JFS_IP(ip)->commit_mutex);  in extAlloc()
158 		mutex_unlock(&JFS_IP(ip)->commit_mutex);  in extAlloc()
166 	xp->flag = xflag;  in extAlloc()
170 	mutex_unlock(&JFS_IP(ip)->commit_mutex);  in extAlloc()
188  *	ip	- the inode of the file.
189  *	offset  - file offset for which the hint is needed.
190  *	xp	- pointer to the xad that is to be filled in with
194  *	0	- success
195  *	-EIO	- i/o error.
199 	struct super_block *sb = ip->i_sb;  in extHint()
200 	int nbperpage = JFS_SBI(sb)->nbperpage;  in extHint()
204 	int xlen;  in extHint()  local
213 	prev = ((offset & ~POFFSET) >> JFS_SBI(sb)->l2bsize) - nbperpage;  in extHint()
220 	rc = xtLookup(ip, prev, nbperpage, &xflag, &xaddr, &xlen, 0);  in extHint()
222 	if ((rc == 0) && xlen) {  in extHint()
223 		if (xlen != nbperpage) {  in extHint()
224 			jfs_error(ip->i_sb, "corrupt xtree\n");  in extHint()
225 			rc = -EIO;  in extHint()
228 		XADlength(xp, xlen);  in extHint()
234 		xp->flag  = xflag & XAD_NOTRECORDED;  in extHint()
249  *	ip	- inode of the file.
250  *	cp	- cbuf of the file page.
253  *	0	- success
254  *	-EIO	- i/o error.
255  *	-ENOSPC	- insufficient disk resources.
262 		jfs_error(ip->i_sb, "read-only filesystem\n");  in extRecord()
263 		return -EIO;  in extRecord()
266 	txBeginAnon(ip->i_sb);  in extRecord()
268 	mutex_lock(&JFS_IP(ip)->commit_mutex);  in extRecord()
273 	mutex_unlock(&JFS_IP(ip)->commit_mutex);  in extRecord()
288  *		number (i.e. 16 -> 8).  we'll continue to round down and
293  *	ip	 - the inode of the file.
294  *	hint	 - disk block number to be used as an allocation hint.
295  *	*nblocks - pointer to an s64 value.  on entry, this value specifies
299  *	blkno	 - pointer to a block address that is filled in on successful
304  *	0	- success
305  *	-EIO	- i/o error.
306  *	-ENOSPC	- insufficient disk resources.
312 	struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);  in extBalloc()
314 	int rc, nbperpage = sbi->nbperpage;  in extBalloc()
315 	struct bmap *bmp = sbi->bmap;  in extBalloc()
326 	if (bmp->db_maxfreebud == -1)  in extBalloc()
327 		return -ENOSPC;  in extBalloc()
329 	max = (s64) 1 << bmp->db_maxfreebud;  in extBalloc()
340 		if (rc != -ENOSPC)  in extBalloc()
354 	if (S_ISREG(ip->i_mode) && (ji->fileset == FILESYSTEM_I)) {  in extBalloc()
356 		spin_lock_irq(&ji->ag_lock);  in extBalloc()
357 		if (ji->active_ag == -1) {  in extBalloc()
358 			atomic_inc(&bmp->db_active[ag]);  in extBalloc()
359 			ji->active_ag = ag;  in extBalloc()
360 		} else if (ji->active_ag != ag) {  in extBalloc()
361 			atomic_dec(&bmp->db_active[ji->active_ag]);  in extBalloc()
362 			atomic_inc(&bmp->db_active[ag]);  in extBalloc()
363 			ji->active_ag = ag;  in extBalloc()
365 		spin_unlock_irq(&ji->ag_lock);  in extBalloc()
378  *	nb	- the inode of the file.
388 	for (i = 0, m = (u64) 1 << 63; i < 64; i++, m >>= 1) {  in extRoundDown()
393 	i = 63 - i;  in extRoundDown()
394 	k = (u64) 1 << i;  in extRoundDown()
395 	k = ((k - 1) & nb) ? k : k >> 1;  in extRoundDown()