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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2005-06-28 23:45:18 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-29 00:20:35 -0400
commit200803dfe4ff772740d63db725ab2f1b185ccf92 (patch)
treef567852c984c947f792edb18fee273cfa363d374 /kernel/irq
parent21fe3471c3aaa5c489c5d3a4d705291eb7511248 (diff)
[PATCH] irqpoll
Anyone reporting a stuck IRQ should try these options. Its effectiveness varies we've found in the Fedora case. Quite a few systems with misdescribed IRQ routing just work when you use irqpoll. It also fixes up the VIA systems although thats now fixed with the VIA quirk (which we could just make default as its what Redmond OS does but Linus didn't like it historically). A small number of systems have jammed IRQ sources or misdescribes that cause an IRQ that we have no handler registered anywhere for. In those cases it doesn't help. Signed-off-by: Alan Cox <number6@the-village.bc.nu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/handle.c2
-rw-r--r--kernel/irq/spurious.c113
2 files changed, 112 insertions, 3 deletions
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 436c7d93c00a..c29f83c16497 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -172,7 +172,7 @@ fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs)
172 172
173 spin_lock(&desc->lock); 173 spin_lock(&desc->lock);
174 if (!noirqdebug) 174 if (!noirqdebug)
175 note_interrupt(irq, desc, action_ret); 175 note_interrupt(irq, desc, action_ret, regs);
176 if (likely(!(desc->status & IRQ_PENDING))) 176 if (likely(!(desc->status & IRQ_PENDING)))
177 break; 177 break;
178 desc->status &= ~IRQ_PENDING; 178 desc->status &= ~IRQ_PENDING;
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index ba039e827d58..7df9abd5ec86 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -11,6 +11,83 @@
11#include <linux/kallsyms.h> 11#include <linux/kallsyms.h>
12#include <linux/interrupt.h> 12#include <linux/interrupt.h>
13 13
14static int irqfixup;
15
16/*
17 * Recovery handler for misrouted interrupts.
18 */
19
20static int misrouted_irq(int irq, struct pt_regs *regs)
21{
22 int i;
23 irq_desc_t *desc;
24 int ok = 0;
25 int work = 0; /* Did we do work for a real IRQ */
26
27 for(i = 1; i < NR_IRQS; i++) {
28 struct irqaction *action;
29
30 if (i == irq) /* Already tried */
31 continue;
32 desc = &irq_desc[i];
33 spin_lock(&desc->lock);
34 action = desc->action;
35 /* Already running on another processor */
36 if (desc->status & IRQ_INPROGRESS) {
37 /*
38 * Already running: If it is shared get the other
39 * CPU to go looking for our mystery interrupt too
40 */
41 if (desc->action && (desc->action->flags & SA_SHIRQ))
42 desc->status |= IRQ_PENDING;
43 spin_unlock(&desc->lock);
44 continue;
45 }
46 /* Honour the normal IRQ locking */
47 desc->status |= IRQ_INPROGRESS;
48 spin_unlock(&desc->lock);
49 while (action) {
50 /* Only shared IRQ handlers are safe to call */
51 if (action->flags & SA_SHIRQ) {
52 if (action->handler(i, action->dev_id, regs) ==
53 IRQ_HANDLED)
54 ok = 1;
55 }
56 action = action->next;
57 }
58 local_irq_disable();
59 /* Now clean up the flags */
60 spin_lock(&desc->lock);
61 action = desc->action;
62
63 /*
64 * While we were looking for a fixup someone queued a real
65 * IRQ clashing with our walk
66 */
67
68 while ((desc->status & IRQ_PENDING) && action) {
69 /*
70 * Perform real IRQ processing for the IRQ we deferred
71 */
72 work = 1;
73 spin_unlock(&desc->lock);
74 handle_IRQ_event(i, regs, action);
75 spin_lock(&desc->lock);
76 desc->status &= ~IRQ_PENDING;
77 }
78 desc->status &= ~IRQ_INPROGRESS;
79 /*
80 * If we did actual work for the real IRQ line we must let the
81 * IRQ controller clean up too
82 */
83 if(work)
84 desc->handler->end(i);
85 spin_unlock(&desc->lock);
86 }
87 /* So the caller can adjust the irq error counts */
88 return ok;
89}
90
14/* 91/*
15 * If 99,900 of the previous 100,000 interrupts have not been handled 92 * If 99,900 of the previous 100,000 interrupts have not been handled
16 * then assume that the IRQ is stuck in some manner. Drop a diagnostic 93 * then assume that the IRQ is stuck in some manner. Drop a diagnostic
@@ -31,7 +108,8 @@ __report_bad_irq(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret)
31 printk(KERN_ERR "irq event %d: bogus return value %x\n", 108 printk(KERN_ERR "irq event %d: bogus return value %x\n",
32 irq, action_ret); 109 irq, action_ret);
33 } else { 110 } else {
34 printk(KERN_ERR "irq %d: nobody cared!\n", irq); 111 printk(KERN_ERR "irq %d: nobody cared (try booting with "
112 "the \"irqpoll\" option)\n", irq);
35 } 113 }
36 dump_stack(); 114 dump_stack();
37 printk(KERN_ERR "handlers:\n"); 115 printk(KERN_ERR "handlers:\n");
@@ -55,7 +133,8 @@ static void report_bad_irq(unsigned int irq, irq_desc_t *desc, irqreturn_t actio
55 } 133 }
56} 134}
57 135
58void note_interrupt(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret) 136void note_interrupt(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret,
137 struct pt_regs *regs)
59{ 138{
60 if (action_ret != IRQ_HANDLED) { 139 if (action_ret != IRQ_HANDLED) {
61 desc->irqs_unhandled++; 140 desc->irqs_unhandled++;
@@ -63,6 +142,15 @@ void note_interrupt(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret)
63 report_bad_irq(irq, desc, action_ret); 142 report_bad_irq(irq, desc, action_ret);
64 } 143 }
65 144
145 if (unlikely(irqfixup)) {
146 /* Don't punish working computers */
147 if ((irqfixup == 2 && irq == 0) || action_ret == IRQ_NONE) {
148 int ok = misrouted_irq(irq, regs);
149 if (action_ret == IRQ_NONE)
150 desc->irqs_unhandled -= ok;
151 }
152 }
153
66 desc->irq_count++; 154 desc->irq_count++;
67 if (desc->irq_count < 100000) 155 if (desc->irq_count < 100000)
68 return; 156 return;
@@ -94,3 +182,24 @@ int __init noirqdebug_setup(char *str)
94 182
95__setup("noirqdebug", noirqdebug_setup); 183__setup("noirqdebug", noirqdebug_setup);
96 184
185static int __init irqfixup_setup(char *str)
186{
187 irqfixup = 1;
188 printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n");
189 printk(KERN_WARNING "This may impact system performance.\n");
190 return 1;
191}
192
193__setup("irqfixup", irqfixup_setup);
194
195static int __init irqpoll_setup(char *str)
196{
197 irqfixup = 2;
198 printk(KERN_WARNING "Misrouted IRQ fixup and polling support "
199 "enabled\n");
200 printk(KERN_WARNING "This may significantly impact system "
201 "performance\n");
202 return 1;
203}
204
205__setup("irqpoll", irqpoll_setup);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-21 21:24:53 -0500
n1438' href='#n1438'>1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 
/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>

#include "gfs2.h"
#include "incore.h"
#include "glock.h"
#include "glops.h"
#include "lops.h"
#include "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "super.h"
#include "trans.h"
#include "ops_file.h"
#include "util.h"
#include "log.h"

#define BFITNOENT ((u32)~0)

/*
 * These routines are used by the resource group routines (rgrp.c)
 * to keep track of block allocation.  Each block is represented by two
 * bits.  So, each byte represents GFS2_NBBY (i.e. 4) blocks.
 *
 * 0 = Free
 * 1 = Used (not metadata)
 * 2 = Unlinked (still in use) inode
 * 3 = Used (metadata)
 */

static const char valid_change[16] = {
	        /* current */
	/* n */ 0, 1, 1, 1,
	/* e */ 1, 0, 0, 0,
	/* w */ 0, 0, 0, 1,
	        1, 0, 0, 0
};

/**
 * gfs2_setbit - Set a bit in the bitmaps
 * @buffer: the buffer that holds the bitmaps
 * @buflen: the length (in bytes) of the buffer
 * @block: the block to set
 * @new_state: the new state of the block
 *
 */

static void gfs2_setbit(struct gfs2_rgrpd *rgd, unsigned char *buffer,
			unsigned int buflen, u32 block,
			unsigned char new_state)
{
	unsigned char *byte, *end, cur_state;
	unsigned int bit;

	byte = buffer + (block / GFS2_NBBY);
	bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;
	end = buffer + buflen;

	gfs2_assert(rgd->rd_sbd, byte < end);

	cur_state = (*byte >> bit) & GFS2_BIT_MASK;

	if (valid_change[new_state * 4 + cur_state]) {
		*byte ^= cur_state << bit;
		*byte |= new_state << bit;
	} else
		gfs2_consist_rgrpd(rgd);
}

/**
 * gfs2_testbit - test a bit in the bitmaps
 * @buffer: the buffer that holds the bitmaps
 * @buflen: the length (in bytes) of the buffer
 * @block: the block to read
 *
 */

static unsigned char gfs2_testbit(struct gfs2_rgrpd *rgd, unsigned char *buffer,
				  unsigned int buflen, u32 block)
{
	unsigned char *byte, *end, cur_state;
	unsigned int bit;

	byte = buffer + (block / GFS2_NBBY);
	bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;
	end = buffer + buflen;

	gfs2_assert(rgd->rd_sbd, byte < end);

	cur_state = (*byte >> bit) & GFS2_BIT_MASK;

	return cur_state;
}

/**
 * gfs2_bitfit - Search an rgrp's bitmap buffer to find a bit-pair representing
 *       a block in a given allocation state.
 * @buffer: the buffer that holds the bitmaps
 * @buflen: the length (in bytes) of the buffer
 * @goal: start search at this block's bit-pair (within @buffer)
 * @old_state: GFS2_BLKST_XXX the state of the block we're looking for;
 *       bit 0 = alloc(1)/free(0), bit 1 = meta(1)/data(0)
 *
 * Scope of @goal and returned block number is only within this bitmap buffer,
 * not entire rgrp or filesystem.  @buffer will be offset from the actual
 * beginning of a bitmap block buffer, skipping any header structures.
 *
 * Return: the block number (bitmap buffer scope) that was found
 */

static u32 gfs2_bitfit(struct gfs2_rgrpd *rgd, unsigned char *buffer,
			    unsigned int buflen, u32 goal,
			    unsigned char old_state)
{
	unsigned char *byte, *end, alloc;
	u32 blk = goal;
	unsigned int bit;

	byte = buffer + (goal / GFS2_NBBY);
	bit = (goal % GFS2_NBBY) * GFS2_BIT_SIZE;
	end = buffer + buflen;
	alloc = (old_state & 1) ? 0 : 0x55;

	while (byte < end) {
		if ((*byte & 0x55) == alloc) {
			blk += (8 - bit) >> 1;

			bit = 0;
			byte++;

			continue;
		}

		if (((*byte >> bit) & GFS2_BIT_MASK) == old_state)
			return blk;

		bit += GFS2_BIT_SIZE;
		if (bit >= 8) {
			bit = 0;
			byte++;
		}

		blk++;
	}

	return BFITNOENT;
}

/**
 * gfs2_bitcount - count the number of bits in a certain state
 * @buffer: the buffer that holds the bitmaps
 * @buflen: the length (in bytes) of the buffer
 * @state: the state of the block we're looking for
 *
 * Returns: The number of bits
 */

static u32 gfs2_bitcount(struct gfs2_rgrpd *rgd, unsigned char *buffer,
			      unsigned int buflen, unsigned char state)
{
	unsigned char *byte = buffer;
	unsigned char *end = buffer + buflen;
	unsigned char state1 = state << 2;
	unsigned char state2 = state << 4;
	unsigned char state3 = state << 6;
	u32 count = 0;

	for (; byte < end; byte++) {
		if (((*byte) & 0x03) == state)
			count++;
		if (((*byte) & 0x0C) == state1)
			count++;
		if (((*byte) & 0x30) == state2)
			count++;
		if (((*byte) & 0xC0) == state3)
			count++;
	}

	return count;
}

/**
 * gfs2_rgrp_verify - Verify that a resource group is consistent
 * @sdp: the filesystem
 * @rgd: the rgrp
 *
 */

void gfs2_rgrp_verify(struct gfs2_rgrpd *rgd)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
	struct gfs2_bitmap *bi = NULL;
	u32 length = rgd->rd_ri.ri_length;
	u32 count[4], tmp;
	int buf, x;

	memset(count, 0, 4 * sizeof(u32));

	/* Count # blocks in each of 4 possible allocation states */
	for (buf = 0; buf < length; buf++) {
		bi = rgd->rd_bits + buf;
		for (x = 0; x < 4; x++)
			count[x] += gfs2_bitcount(rgd,
						  bi->bi_bh->b_data +
						  bi->bi_offset,
						  bi->bi_len, x);
	}

	if (count[0] != rgd->rd_rg.rg_free) {
		if (gfs2_consist_rgrpd(rgd))
			fs_err(sdp, "free data mismatch:  %u != %u\n",
			       count[0], rgd->rd_rg.rg_free);
		return;
	}

	tmp = rgd->rd_ri.ri_data -
		rgd->rd_rg.rg_free -
		rgd->rd_rg.rg_dinodes;
	if (count[1] + count[2] != tmp) {
		if (gfs2_consist_rgrpd(rgd))
			fs_err(sdp, "used data mismatch:  %u != %u\n",
			       count[1], tmp);
		return;
	}

	if (count[3] != rgd->rd_rg.rg_dinodes) {
		if (gfs2_consist_rgrpd(rgd))
			fs_err(sdp, "used metadata mismatch:  %u != %u\n",
			       count[3], rgd->rd_rg.rg_dinodes);
		return;
	}

	if (count[2] > count[3]) {
		if (gfs2_consist_rgrpd(rgd))
			fs_err(sdp, "unlinked inodes > inodes:  %u\n",
			       count[2]);
		return;
	}

}

static inline int rgrp_contains_block(struct gfs2_rindex_host *ri, u64 block)
{
	u64 first = ri->ri_data0;
	u64 last = first + ri->ri_data;
	return first <= block && block < last;
}

/**
 * gfs2_blk2rgrpd - Find resource group for a given data/meta block number
 * @sdp: The GFS2 superblock
 * @n: The data block number
 *
 * Returns: The resource group, or NULL if not found
 */

struct gfs2_rgrpd *gfs2_blk2rgrpd(struct gfs2_sbd *sdp, u64 blk)
{
	struct gfs2_rgrpd *rgd;

	spin_lock(&sdp->sd_rindex_spin);

	list_for_each_entry(rgd, &sdp->sd_rindex_mru_list, rd_list_mru) {
		if (rgrp_contains_block(&rgd->rd_ri, blk)) {
			list_move(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);
			spin_unlock(&sdp->sd_rindex_spin);
			return rgd;
		}
	}

	spin_unlock(&sdp->sd_rindex_spin);

	return NULL;
}

/**
 * gfs2_rgrpd_get_first - get the first Resource Group in the filesystem
 * @sdp: The GFS2 superblock
 *
 * Returns: The first rgrp in the filesystem
 */

struct gfs2_rgrpd *gfs2_rgrpd_get_first(struct gfs2_sbd *sdp)
{
	gfs2_assert(sdp, !list_empty(&sdp->sd_rindex_list));
	return list_entry(sdp->sd_rindex_list.next, struct gfs2_rgrpd, rd_list);
}

/**
 * gfs2_rgrpd_get_next - get the next RG
 * @rgd: A RG
 *
 * Returns: The next rgrp
 */

struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd)
{
	if (rgd->rd_list.next == &rgd->rd_sbd->sd_rindex_list)
		return NULL;
	return list_entry(rgd->rd_list.next, struct gfs2_rgrpd, rd_list);
}

static void clear_rgrpdi(struct gfs2_sbd *sdp)
{
	struct list_head *head;
	struct gfs2_rgrpd *rgd;
	struct gfs2_glock *gl;

	spin_lock(&sdp->sd_rindex_spin);
	sdp->sd_rindex_forward = NULL;
	head = &sdp->sd_rindex_recent_list;
	while (!list_empty(head)) {
		rgd = list_entry(head->next, struct gfs2_rgrpd, rd_recent);
		list_del(&rgd->rd_recent);
	}
	spin_unlock(&sdp->sd_rindex_spin);

	head = &sdp->sd_rindex_list;
	while (!list_empty(head)) {
		rgd = list_entry(head->next, struct gfs2_rgrpd, rd_list);
		gl = rgd->rd_gl;

		list_del(&rgd->rd_list);
		list_del(&rgd->rd_list_mru);

		if (gl) {
			gl->gl_object = NULL;
			gfs2_glock_put(gl);
		}

		kfree(rgd->rd_bits);
		kfree(rgd);
	}
}

void gfs2_clear_rgrpd(struct gfs2_sbd *sdp)
{
	mutex_lock(&sdp->sd_rindex_mutex);
	clear_rgrpdi(sdp);
	mutex_unlock(&sdp->sd_rindex_mutex);
}

/**
 * gfs2_compute_bitstructs - Compute the bitmap sizes
 * @rgd: The resource group descriptor
 *
 * Calculates bitmap descriptors, one for each block that contains bitmap data
 *
 * Returns: errno
 */

static int compute_bitstructs(struct gfs2_rgrpd *rgd)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
	struct gfs2_bitmap *bi;
	u32 length = rgd->rd_ri.ri_length; /* # blocks in hdr & bitmap */
	u32 bytes_left, bytes;
	int x;

	if (!length)
		return -EINVAL;

	rgd->rd_bits = kcalloc(length, sizeof(struct gfs2_bitmap), GFP_NOFS);
	if (!rgd->rd_bits)
		return -ENOMEM;

	bytes_left = rgd->rd_ri.ri_bitbytes;

	for (x = 0; x < length; x++) {
		bi = rgd->rd_bits + x;

		/* small rgrp; bitmap stored completely in header block */
		if (length == 1) {
			bytes = bytes_left;
			bi->bi_offset = sizeof(struct gfs2_rgrp);
			bi->bi_start = 0;
			bi->bi_len = bytes;
		/* header block */
		} else if (x == 0) {
			bytes = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_rgrp);
			bi->bi_offset = sizeof(struct gfs2_rgrp);
			bi->bi_start = 0;
			bi->bi_len = bytes;
		/* last block */
		} else if (x + 1 == length) {
			bytes = bytes_left;
			bi->bi_offset = sizeof(struct gfs2_meta_header);
			bi->bi_start = rgd->rd_ri.ri_bitbytes - bytes_left;
			bi->bi_len = bytes;
		/* other blocks */
		} else {
			bytes = sdp->sd_sb.sb_bsize -
				sizeof(struct gfs2_meta_header);
			bi->bi_offset = sizeof(struct gfs2_meta_header);
			bi->bi_start = rgd->rd_ri.ri_bitbytes - bytes_left;
			bi->bi_len = bytes;
		}

		bytes_left -= bytes;
	}

	if (bytes_left) {
		gfs2_consist_rgrpd(rgd);
		return -EIO;
	}
	bi = rgd->rd_bits + (length - 1);
	if ((bi->bi_start + bi->bi_len) * GFS2_NBBY != rgd->rd_ri.ri_data) {
		if (gfs2_consist_rgrpd(rgd)) {
			gfs2_rindex_print(&rgd->rd_ri);
			fs_err(sdp, "start=%u len=%u offset=%u\n",
			       bi->bi_start, bi->bi_len, bi->bi_offset);
		}
		return -EIO;
	}

	return 0;
}

/**
 * gfs2_ri_update - Pull in a new resource index from the disk
 * @gl: The glock covering the rindex inode
 *
 * Returns: 0 on successful update, error code otherwise
 */

static int gfs2_ri_update(struct gfs2_inode *ip)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct inode *inode = &ip->i_inode;
	struct gfs2_rgrpd *rgd;
	char buf[sizeof(struct gfs2_rindex)];
	struct file_ra_state ra_state;
	u64 junk = ip->i_di.di_size;
	int error;

	if (do_div(junk, sizeof(struct gfs2_rindex))) {
		gfs2_consist_inode(ip);
		return -EIO;
	}

	clear_rgrpdi(sdp);

	file_ra_state_init(&ra_state, inode->i_mapping);
	for (sdp->sd_rgrps = 0;; sdp->sd_rgrps++) {
		loff_t pos = sdp->sd_rgrps * sizeof(struct gfs2_rindex);
		error = gfs2_internal_read(ip, &ra_state, buf, &pos,
					    sizeof(struct gfs2_rindex));
		if (!error)
			break;
		if (error != sizeof(struct gfs2_rindex)) {
			if (error > 0)
				error = -EIO;
			goto fail;
		}

		rgd = kzalloc(sizeof(struct gfs2_rgrpd), GFP_NOFS);
		error = -ENOMEM;
		if (!rgd)
			goto fail;

		mutex_init(&rgd->rd_mutex);
		lops_init_le(&rgd->rd_le, &gfs2_rg_lops);
		rgd->rd_sbd = sdp;

		list_add_tail(&rgd->rd_list, &sdp->sd_rindex_list);
		list_add_tail(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);

		gfs2_rindex_in(&rgd->rd_ri, buf);
		error = compute_bitstructs(rgd);
		if (error)
			goto fail;

		error = gfs2_glock_get(sdp, rgd->rd_ri.ri_addr,
				       &gfs2_rgrp_glops, CREATE, &rgd->rd_gl);
		if (error)
			goto fail;

		rgd->rd_gl->gl_object = rgd;
		rgd->rd_rg_vn = rgd->rd_gl->gl_vn - 1;
	}

	sdp->sd_rindex_vn = ip->i_gl->gl_vn;
	return 0;

fail:
	clear_rgrpdi(sdp);
	return error;
}

/**
 * gfs2_rindex_hold - Grab a lock on the rindex
 * @sdp: The GFS2 superblock
 * @ri_gh: the glock holder
 *
 * We grab a lock on the rindex inode to make sure that it doesn't
 * change whilst we are performing an operation. We keep this lock
 * for quite long periods of time compared to other locks. This
 * doesn't matter, since it is shared and it is very, very rarely
 * accessed in the exclusive mode (i.e. only when expanding the filesystem).
 *
 * This makes sure that we're using the latest copy of the resource index
 * special file, which might have been updated if someone expanded the
 * filesystem (via gfs2_grow utility), which adds new resource groups.
 *
 * Returns: 0 on success, error code otherwise
 */

int gfs2_rindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ri_gh)
{
	struct gfs2_inode *ip = GFS2_I(sdp->sd_rindex);
	struct gfs2_glock *gl = ip->i_gl;
	int error;

	error = gfs2_glock_nq_init(gl, LM_ST_SHARED, 0, ri_gh);
	if (error)
		return error;

	/* Read new copy from disk if we don't have the latest */
	if (sdp->sd_rindex_vn != gl->gl_vn) {
		mutex_lock(&sdp->sd_rindex_mutex);
		if (sdp->sd_rindex_vn != gl->gl_vn) {
			error = gfs2_ri_update(ip);
			if (error)
				gfs2_glock_dq_uninit(ri_gh);
		}
		mutex_unlock(&sdp->sd_rindex_mutex);
	}

	return error;
}

/**
 * gfs2_rgrp_bh_get - Read in a RG's header and bitmaps
 * @rgd: the struct gfs2_rgrpd describing the RG to read in
 *
 * Read in all of a Resource Group's header and bitmap blocks.
 * Caller must eventually call gfs2_rgrp_relse() to free the bitmaps.
 *
 * Returns: errno
 */

int gfs2_rgrp_bh_get(struct gfs2_rgrpd *rgd)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
	struct gfs2_glock *gl = rgd->rd_gl;
	unsigned int length = rgd->rd_ri.ri_length;
	struct gfs2_bitmap *bi;
	unsigned int x, y;
	int error;

	mutex_lock(&rgd->rd_mutex);

	spin_lock(&sdp->sd_rindex_spin);
	if (rgd->rd_bh_count) {
		rgd->rd_bh_count++;
		spin_unlock(&sdp->sd_rindex_spin);
		mutex_unlock(&rgd->rd_mutex);
		return 0;
	}
	spin_unlock(&sdp->sd_rindex_spin);

	for (x = 0; x < length; x++) {
		bi = rgd->rd_bits + x;
		error = gfs2_meta_read(gl, rgd->rd_ri.ri_addr + x, 0, &bi->bi_bh);
		if (error)
			goto fail;
	}

	for (y = length; y--;) {
		bi = rgd->rd_bits + y;
		error = gfs2_meta_wait(sdp, bi->bi_bh);
		if (error)
			goto fail;
		if (gfs2_metatype_check(sdp, bi->bi_bh, y ? GFS2_METATYPE_RB :
					      GFS2_METATYPE_RG)) {
			error = -EIO;
			goto fail;
		}
	}

	if (rgd->rd_rg_vn != gl->gl_vn) {
		gfs2_rgrp_in(&rgd->rd_rg, (rgd->rd_bits[0].bi_bh)->b_data);
		rgd->rd_rg_vn = gl->gl_vn;
	}

	spin_lock(&sdp->sd_rindex_spin);
	rgd->rd_free_clone = rgd->rd_rg.rg_free;
	rgd->rd_bh_count++;
	spin_unlock(&sdp->sd_rindex_spin);

	mutex_unlock(&rgd->rd_mutex);

	return 0;

fail:
	while (x--) {
		bi = rgd->rd_bits + x;
		brelse(bi->bi_bh);
		bi->bi_bh = NULL;
		gfs2_assert_warn(sdp, !bi->bi_clone);
	}
	mutex_unlock(&rgd->rd_mutex);

	return error;
}

void gfs2_rgrp_bh_hold(struct gfs2_rgrpd *rgd)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;

	spin_lock(&sdp->sd_rindex_spin);
	gfs2_assert_warn(rgd->rd_sbd, rgd->rd_bh_count);
	rgd->rd_bh_count++;
	spin_unlock(&sdp->sd_rindex_spin);
}

/**
 * gfs2_rgrp_bh_put - Release RG bitmaps read in with gfs2_rgrp_bh_get()
 * @rgd: the struct gfs2_rgrpd describing the RG to read in
 *
 */

void gfs2_rgrp_bh_put(struct gfs2_rgrpd *rgd)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
	int x, length = rgd->rd_ri.ri_length;

	spin_lock(&sdp->sd_rindex_spin);
	gfs2_assert_warn(rgd->rd_sbd, rgd->rd_bh_count);
	if (--rgd->rd_bh_count) {
		spin_unlock(&sdp->sd_rindex_spin);
		return;
	}

	for (x = 0; x < length; x++) {
		struct gfs2_bitmap *bi = rgd->rd_bits + x;
		kfree(bi->bi_clone);
		bi->bi_clone = NULL;
		brelse(bi->bi_bh);
		bi->bi_bh = NULL;
	}

	spin_unlock(&sdp->sd_rindex_spin);
}

void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
	unsigned int length = rgd->rd_ri.ri_length;
	unsigned int x;

	for (x = 0; x < length; x++) {
		struct gfs2_bitmap *bi = rgd->rd_bits + x;
		if (!bi->bi_clone)
			continue;
		memcpy(bi->bi_clone + bi->bi_offset,
		       bi->bi_bh->b_data + bi->bi_offset, bi->bi_len);
	}

	spin_lock(&sdp->sd_rindex_spin);
	rgd->rd_free_clone = rgd->rd_rg.rg_free;
	spin_unlock(&sdp->sd_rindex_spin);
}

/**
 * gfs2_alloc_get - get the struct gfs2_alloc structure for an inode
 * @ip: the incore GFS2 inode structure
 *
 * Returns: the struct gfs2_alloc
 */

struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip)
{
	struct gfs2_alloc *al = &ip->i_alloc;

	/* FIXME: Should assert that the correct locks are held here... */
	memset(al, 0, sizeof(*al));
	return al;
}

/**
 * try_rgrp_fit - See if a given reservation will fit in a given RG
 * @rgd: the RG data
 * @al: the struct gfs2_alloc structure describing the reservation
 *
 * If there's room for the requested blocks to be allocated from the RG:
 *   Sets the $al_rgd field in @al.
 *
 * Returns: 1 on success (it fits), 0 on failure (it doesn't fit)
 */

static int try_rgrp_fit(struct gfs2_rgrpd *rgd, struct gfs2_alloc *al)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
	int ret = 0;

	if (rgd->rd_rg.rg_flags & GFS2_RGF_NOALLOC)
		return 0;

	spin_lock(&sdp->sd_rindex_spin);
	if (rgd->rd_free_clone >= al->al_requested) {
		al->al_rgd = rgd;
		ret = 1;
	}
	spin_unlock(&sdp->sd_rindex_spin);

	return ret;
}

/**
 * recent_rgrp_first - get first RG from "recent" list
 * @sdp: The GFS2 superblock
 * @rglast: address of the rgrp used last
 *
 * Returns: The first rgrp in the recent list
 */

static struct gfs2_rgrpd *recent_rgrp_first(struct gfs2_sbd *sdp,
					    u64 rglast)
{
	struct gfs2_rgrpd *rgd = NULL;

	spin_lock(&sdp->sd_rindex_spin);

	if (list_empty(&sdp->sd_rindex_recent_list))
		goto out;

	if (!rglast)
		goto first;

	list_for_each_entry(rgd, &sdp->sd_rindex_recent_list, rd_recent) {
		if (rgd->rd_ri.ri_addr == rglast)
			goto out;
	}

first:
	rgd = list_entry(sdp->sd_rindex_recent_list.next, struct gfs2_rgrpd,
			 rd_recent);
out:
	spin_unlock(&sdp->sd_rindex_spin);
	return rgd;
}

/**
 * recent_rgrp_next - get next RG from "recent" list
 * @cur_rgd: current rgrp
 * @remove:
 *
 * Returns: The next rgrp in the recent list
 */

static struct gfs2_rgrpd *recent_rgrp_next(struct gfs2_rgrpd *cur_rgd,
					   int remove)
{
	struct gfs2_sbd *sdp = cur_rgd->rd_sbd;
	struct list_head *head;
	struct gfs2_rgrpd *rgd;

	spin_lock(&sdp->sd_rindex_spin);

	head = &sdp->sd_rindex_recent_list;

	list_for_each_entry(rgd, head, rd_recent) {
		if (rgd == cur_rgd) {
			if (cur_rgd->rd_recent.next != head)
				rgd = list_entry(cur_rgd->rd_recent.next,
						 struct gfs2_rgrpd, rd_recent);
			else
				rgd = NULL;

			if (remove)
				list_del(&cur_rgd->rd_recent);

			goto out;
		}
	}

	rgd = NULL;
	if (!list_empty(head))
		rgd = list_entry(head->next, struct gfs2_rgrpd, rd_recent);

out:
	spin_unlock(&sdp->sd_rindex_spin);
	return rgd;
}

/**
 * recent_rgrp_add - add an RG to tail of "recent" list
 * @new_rgd: The rgrp to add
 *
 */

static void recent_rgrp_add(struct gfs2_rgrpd *new_rgd)
{
	struct gfs2_sbd *sdp = new_rgd->rd_sbd;
	struct gfs2_rgrpd *rgd;
	unsigned int count = 0;
	unsigned int max = sdp->sd_rgrps / gfs2_jindex_size(sdp);

	spin_lock(&sdp->sd_rindex_spin);

	list_for_each_entry(rgd, &sdp->sd_rindex_recent_list, rd_recent) {
		if (rgd == new_rgd)
			goto out;

		if (++count >= max)
			goto out;
	}
	list_add_tail(&new_rgd->rd_recent, &sdp->sd_rindex_recent_list);

out:
	spin_unlock(&sdp->sd_rindex_spin);
}

/**
 * forward_rgrp_get - get an rgrp to try next from full list
 * @sdp: The GFS2 superblock
 *
 * Returns: The rgrp to try next
 */

static struct gfs2_rgrpd *forward_rgrp_get(struct gfs2_sbd *sdp)
{
	struct gfs2_rgrpd *rgd;
	unsigned int journals = gfs2_jindex_size(sdp);
	unsigned int rg = 0, x;

	spin_lock(&sdp->sd_rindex_spin);

	rgd = sdp->sd_rindex_forward;
	if (!rgd) {
		if (sdp->sd_rgrps >= journals)
			rg = sdp->sd_rgrps * sdp->sd_jdesc->jd_jid / journals;

		for (x = 0, rgd = gfs2_rgrpd_get_first(sdp); x < rg;
		     x++, rgd = gfs2_rgrpd_get_next(rgd))
			/* Do Nothing */;

		sdp->sd_rindex_forward = rgd;
	}

	spin_unlock(&sdp->sd_rindex_spin);

	return rgd;
}

/**
 * forward_rgrp_set - set the forward rgrp pointer
 * @sdp: the filesystem
 * @rgd: The new forward rgrp
 *
 */

static void forward_rgrp_set(struct gfs2_sbd *sdp, struct gfs2_rgrpd *rgd)
{
	spin_lock(&sdp->sd_rindex_spin);
	sdp->sd_rindex_forward = rgd;
	spin_unlock(&sdp->sd_rindex_spin);
}

/**
 * get_local_rgrp - Choose and lock a rgrp for allocation
 * @ip: the inode to reserve space for
 * @rgp: the chosen and locked rgrp
 *
 * Try to acquire rgrp in way which avoids contending with others.
 *
 * Returns: errno
 */

static int get_local_rgrp(struct gfs2_inode *ip)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct gfs2_rgrpd *rgd, *begin = NULL;
	struct gfs2_alloc *al = &ip->i_alloc;
	int flags = LM_FLAG_TRY;
	int skipped = 0;
	int loops = 0;
	int error;

	/* Try recently successful rgrps */

	rgd = recent_rgrp_first(sdp, ip->i_last_rg_alloc);

	while (rgd) {
		error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
					   LM_FLAG_TRY, &al->al_rgd_gh);
		switch (error) {
		case 0:
			if (try_rgrp_fit(rgd, al))
				goto out;
			gfs2_glock_dq_uninit(&al->al_rgd_gh);
			rgd = recent_rgrp_next(rgd, 1);
			break;

		case GLR_TRYFAILED:
			rgd = recent_rgrp_next(rgd, 0);
			break;

		default:
			return error;
		}
	}

	/* Go through full list of rgrps */

	begin = rgd = forward_rgrp_get(sdp);

	for (;;) {
		error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, flags,
					  &al->al_rgd_gh);
		switch (error) {
		case 0:
			if (try_rgrp_fit(rgd, al))
				goto out;
			gfs2_glock_dq_uninit(&al->al_rgd_gh);
			break;

		case GLR_TRYFAILED:
			skipped++;
			break;

		default:
			return error;
		}

		rgd = gfs2_rgrpd_get_next(rgd);
		if (!rgd)
			rgd = gfs2_rgrpd_get_first(sdp);

		if (rgd == begin) {
			if (++loops >= 3)
				return -ENOSPC;
			if (!skipped)
				loops++;
			flags = 0;
			if (loops == 2)
				gfs2_log_flush(sdp, NULL);
		}
	}

out:
	ip->i_last_rg_alloc = rgd->rd_ri.ri_addr;

	if (begin) {
		recent_rgrp_add(rgd);
		rgd = gfs2_rgrpd_get_next(rgd);
		if (!rgd)
			rgd = gfs2_rgrpd_get_first(sdp);
		forward_rgrp_set(sdp, rgd);
	}

	return 0;
}

/**
 * gfs2_inplace_reserve_i - Reserve space in the filesystem
 * @ip: the inode to reserve space for
 *
 * Returns: errno
 */

int gfs2_inplace_reserve_i(struct gfs2_inode *ip, char *file, unsigned int line)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct gfs2_alloc *al = &ip->i_alloc;
	int error;

	if (gfs2_assert_warn(sdp, al->al_requested))
		return -EINVAL;

	error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
	if (error)
		return error;

	error = get_local_rgrp(ip);
	if (error) {
		gfs2_glock_dq_uninit(&al->al_ri_gh);
		return error;
	}

	al->al_file = file;
	al->al_line = line;

	return 0;
}

/**
 * gfs2_inplace_release - release an inplace reservation
 * @ip: the inode the reservation was taken out on
 *
 * Release a reservation made by gfs2_inplace_reserve().
 */

void gfs2_inplace_release(struct gfs2_inode *ip)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct gfs2_alloc *al = &ip->i_alloc;

	if (gfs2_assert_warn(sdp, al->al_alloced <= al->al_requested) == -1)
		fs_warn(sdp, "al_alloced = %u, al_requested = %u "
			     "al_file = %s, al_line = %u\n",
		             al->al_alloced, al->al_requested, al->al_file,
			     al->al_line);

	al->al_rgd = NULL;
	gfs2_glock_dq_uninit(&al->al_rgd_gh);
	gfs2_glock_dq_uninit(&al->al_ri_gh);
}

/**
 * gfs2_get_block_type - Check a block in a RG is of given type
 * @rgd: the resource group holding the block
 * @block: the block number
 *
 * Returns: The block type (GFS2_BLKST_*)
 */

unsigned char gfs2_get_block_type(struct gfs2_rgrpd *rgd, u64 block)
{
	struct gfs2_bitmap *bi = NULL;
	u32 length, rgrp_block, buf_block;
	unsigned int buf;
	unsigned char type;

	length = rgd->rd_ri.ri_length;
	rgrp_block = block - rgd->rd_ri.ri_data0;

	for (buf = 0; buf < length; buf++) {
		bi = rgd->rd_bits + buf;
		if (rgrp_block < (bi->bi_start + bi->bi_len) * GFS2_NBBY)
			break;
	}

	gfs2_assert(rgd->rd_sbd, buf < length);
	buf_block = rgrp_block - bi->bi_start * GFS2_NBBY;

	type = gfs2_testbit(rgd, bi->bi_bh->b_data + bi->bi_offset,
			   bi->bi_len, buf_block);

	return type;
}

/**
 * rgblk_search - find a block in @old_state, change allocation
 *           state to @new_state
 * @rgd: the resource group descriptor
 * @goal: the goal block within the RG (start here to search for avail block)
 * @old_state: GFS2_BLKST_XXX the before-allocation state to find
 * @new_state: GFS2_BLKST_XXX the after-allocation block state
 *
 * Walk rgrp's bitmap to find bits that represent a block in @old_state.
 * Add the found bitmap buffer to the transaction.
 * Set the found bits to @new_state to change block's allocation state.
 *
 * This function never fails, because we wouldn't call it unless we
 * know (from reservation results, etc.) that a block is available.
 *
 * Scope of @goal and returned block is just within rgrp, not the whole
 * filesystem.
 *
 * Returns:  the block number allocated
 */

static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
			     unsigned char old_state, unsigned char new_state)
{
	struct gfs2_bitmap *bi = NULL;
	u32 length = rgd->rd_ri.ri_length;
	u32 blk = 0;
	unsigned int buf, x;

	/* Find bitmap block that contains bits for goal block */
	for (buf = 0; buf < length; buf++) {
		bi = rgd->rd_bits + buf;
		if (goal < (bi->bi_start + bi->bi_len) * GFS2_NBBY)
			break;
	}

	gfs2_assert(rgd->rd_sbd, buf < length);

	/* Convert scope of "goal" from rgrp-wide to within found bit block */
	goal -= bi->bi_start * GFS2_NBBY;

	/* Search (up to entire) bitmap in this rgrp for allocatable block.
	   "x <= length", instead of "x < length", because we typically start
	   the search in the middle of a bit block, but if we can't find an
	   allocatable block anywhere else, we want to be able wrap around and
	   search in the first part of our first-searched bit block.  */
	for (x = 0; x <= length; x++) {
		if (bi->bi_clone)
			blk = gfs2_bitfit(rgd, bi->bi_clone + bi->bi_offset,
					  bi->bi_len, goal, old_state);
		else
			blk = gfs2_bitfit(rgd,
					  bi->bi_bh->b_data + bi->bi_offset,
					  bi->bi_len, goal, old_state);
		if (blk != BFITNOENT)
			break;

		/* Try next bitmap block (wrap back to rgrp header if at end) */
		buf = (buf + 1) % length;
		bi = rgd->rd_bits + buf;
		goal = 0;
	}

	if (gfs2_assert_withdraw(rgd->rd_sbd, x <= length))
		blk = 0;

	gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
	gfs2_setbit(rgd, bi->bi_bh->b_data + bi->bi_offset,
		    bi->bi_len, blk, new_state);
	if (bi->bi_clone)
		gfs2_setbit(rgd, bi->bi_clone + bi->bi_offset,
			    bi->bi_len, blk, new_state);

	return bi->bi_start * GFS2_NBBY + blk;
}

/**
 * rgblk_free - Change alloc state of given block(s)
 * @sdp: the filesystem
 * @bstart: the start of a run of blocks to free
 * @blen: the length of the block run (all must lie within ONE RG!)
 * @new_state: GFS2_BLKST_XXX the after-allocation block state
 *
 * Returns:  Resource group containing the block(s)
 */

static struct gfs2_rgrpd *rgblk_free(struct gfs2_sbd *sdp, u64 bstart,
				     u32 blen, unsigned char new_state)
{
	struct gfs2_rgrpd *rgd;
	struct gfs2_bitmap *bi = NULL;
	u32 length, rgrp_blk, buf_blk;
	unsigned int buf;

	rgd = gfs2_blk2rgrpd(sdp, bstart);
	if (!rgd) {
		if (gfs2_consist(sdp))
			fs_err(sdp, "block = %llu\n", (unsigned long long)bstart);
		return NULL;
	}

	length = rgd->rd_ri.ri_length;

	rgrp_blk = bstart - rgd->rd_ri.ri_data0;

	while (blen--) {
		for (buf = 0; buf < length; buf++) {
			bi = rgd->rd_bits + buf;
			if (rgrp_blk < (bi->bi_start + bi->bi_len) * GFS2_NBBY)
				break;
		}

		gfs2_assert(rgd->rd_sbd, buf < length);

		buf_blk = rgrp_blk - bi->bi_start * GFS2_NBBY;
		rgrp_blk++;

		if (!bi->bi_clone) {
			bi->bi_clone = kmalloc(bi->bi_bh->b_size,
					       GFP_NOFS | __GFP_NOFAIL);
			memcpy(bi->bi_clone + bi->bi_offset,
			       bi->bi_bh->b_data + bi->bi_offset,
			       bi->bi_len);
		}
		gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
		gfs2_setbit(rgd, bi->bi_bh->b_data + bi->bi_offset,
			    bi->bi_len, buf_blk, new_state);
	}

	return rgd;
}

/**
 * gfs2_alloc_data - Allocate a data block
 * @ip: the inode to allocate the data block for
 *
 * Returns: the allocated block
 */

u64 gfs2_alloc_data(struct gfs2_inode *ip)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct gfs2_alloc *al = &ip->i_alloc;
	struct gfs2_rgrpd *rgd = al->al_rgd;
	u32 goal, blk;
	u64 block;

	if (rgrp_contains_block(&rgd->rd_ri, ip->i_di.di_goal_data))
		goal = ip->i_di.di_goal_data - rgd->rd_ri.ri_data0;
	else
		goal = rgd->rd_last_alloc_data;

	blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED);
	rgd->rd_last_alloc_data = blk;

	block = rgd->rd_ri.ri_data0 + blk;
	ip->i_di.di_goal_data = block;

	gfs2_assert_withdraw(sdp, rgd->rd_rg.rg_free);
	rgd->rd_rg.rg_free--;

	gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
	gfs2_rgrp_out(&rgd->rd_rg, rgd->rd_bits[0].bi_bh->b_data);

	al->al_alloced++;

	gfs2_statfs_change(sdp, 0, -1, 0);
	gfs2_quota_change(ip, +1, ip->i_inode.i_uid, ip->i_inode.i_gid);

	spin_lock(&sdp->sd_rindex_spin);
	rgd->rd_free_clone--;
	spin_unlock(&sdp->sd_rindex_spin);

	return block;
}

/**
 * gfs2_alloc_meta - Allocate a metadata block
 * @ip: the inode to allocate the metadata block for
 *
 * Returns: the allocated block
 */

u64 gfs2_alloc_meta(struct gfs2_inode *ip)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct gfs2_alloc *al = &ip->i_alloc;
	struct gfs2_rgrpd *rgd = al->al_rgd;
	u32 goal, blk;
	u64 block;

	if (rgrp_contains_block(&rgd->rd_ri, ip->i_di.di_goal_meta))
		goal = ip->i_di.di_goal_meta - rgd->rd_ri.ri_data0;
	else
		goal = rgd->rd_last_alloc_meta;

	blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED);
	rgd->rd_last_alloc_meta = blk;

	block = rgd->rd_ri.ri_data0 + blk;
	ip->i_di.di_goal_meta = block;

	gfs2_assert_withdraw(sdp, rgd->rd_rg.rg_free);
	rgd->rd_rg.rg_free--;

	gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
	gfs2_rgrp_out(&rgd->rd_rg, rgd->rd_bits[0].bi_bh->b_data);

	al->al_alloced++;

	gfs2_statfs_change(sdp, 0, -1, 0);
	gfs2_quota_change(ip, +1, ip->i_inode.i_uid, ip->i_inode.i_gid);
	gfs2_trans_add_unrevoke(sdp, block);

	spin_lock(&sdp->sd_rindex_spin);
	rgd->rd_free_clone--;
	spin_unlock(&sdp->sd_rindex_spin);

	return block;
}

/**
 * gfs2_alloc_di - Allocate a dinode
 * @dip: the directory that the inode is going in
 *
 * Returns: the block allocated
 */

u64 gfs2_alloc_di(struct gfs2_inode *dip, u64 *generation)
{
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
	struct gfs2_alloc *al = &dip->i_alloc;
	struct gfs2_rgrpd *rgd = al->al_rgd;
	u32 blk;
	u64 block;

	blk = rgblk_search(rgd, rgd->rd_last_alloc_meta,
			   GFS2_BLKST_FREE, GFS2_BLKST_DINODE);

	rgd->rd_last_alloc_meta = blk;

	block = rgd->rd_ri.ri_data0 + blk;

	gfs2_assert_withdraw(sdp, rgd->rd_rg.rg_free);
	rgd->rd_rg.rg_free--;
	rgd->rd_rg.rg_dinodes++;
	*generation = rgd->rd_rg.rg_igeneration++;
	gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
	gfs2_rgrp_out(&rgd->rd_rg, rgd->rd_bits[0].bi_bh->b_data);

	al->al_alloced++;

	gfs2_statfs_change(sdp, 0, -1, +1);
	gfs2_trans_add_unrevoke(sdp, block);

	spin_lock(&sdp->sd_rindex_spin);
	rgd->rd_free_clone--;
	spin_unlock(&sdp->sd_rindex_spin);

	return block;
}

/**
 * gfs2_free_data - free a contiguous run of data block(s)
 * @ip: the inode these blocks are being freed from
 * @bstart: first block of a run of contiguous blocks
 * @blen: the length of the block run
 *
 */

void gfs2_free_data(struct gfs2_inode *ip, u64 bstart, u32 blen)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct gfs2_rgrpd *rgd;

	rgd = rgblk_free(sdp, bstart, blen, GFS2_BLKST_FREE);
	if (!rgd)
		return;

	rgd->rd_rg.rg_free += blen;

	gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
	gfs2_rgrp_out(&rgd->rd_rg, rgd->rd_bits[0].bi_bh->b_data);

	gfs2_trans_add_rg(rgd);

	gfs2_statfs_change(sdp, 0, +blen, 0);
	gfs2_quota_change(ip, -(s64)blen, ip->i_inode.i_uid, ip->i_inode.i_gid);
}

/**
 * gfs2_free_meta - free a contiguous run of data block(s)
 * @ip: the inode these blocks are being freed from
 * @bstart: first block of a run of contiguous blocks
 * @blen: the length of the block run
 *
 */

void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct gfs2_rgrpd *rgd;

	rgd = rgblk_free(sdp, bstart, blen, GFS2_BLKST_FREE);
	if (!rgd)
		return;

	rgd->rd_rg.rg_free += blen;

	gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
	gfs2_rgrp_out(&rgd->rd_rg, rgd->rd_bits[0].bi_bh->b_data);

	gfs2_trans_add_rg(rgd);

	gfs2_statfs_change(sdp, 0, +blen, 0);
	gfs2_quota_change(ip, -(s64)blen, ip->i_inode.i_uid, ip->i_inode.i_gid);
	gfs2_meta_wipe(ip, bstart, blen);
}

void gfs2_unlink_di(struct inode *inode)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_sbd *sdp = GFS2_SB(inode);
	struct gfs2_rgrpd *rgd;
	u64 blkno = ip->i_num.no_addr;

	rgd = rgblk_free(sdp, blkno, 1, GFS2_BLKST_UNLINKED);
	if (!rgd)
		return;
	gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
	gfs2_rgrp_out(&rgd->rd_rg, rgd->rd_bits[0].bi_bh->b_data);
	gfs2_trans_add_rg(rgd);
}

static void gfs2_free_uninit_di(struct gfs2_rgrpd *rgd, u64 blkno)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
	struct gfs2_rgrpd *tmp_rgd;

	tmp_rgd = rgblk_free(sdp, blkno, 1, GFS2_BLKST_FREE);
	if (!tmp_rgd)
		return;
	gfs2_assert_withdraw(sdp, rgd == tmp_rgd);

	if (!rgd->rd_rg.rg_dinodes)
		gfs2_consist_rgrpd(rgd);
	rgd->rd_rg.rg_dinodes--;
	rgd->rd_rg.rg_free++;

	gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
	gfs2_rgrp_out(&rgd->rd_rg, rgd->rd_bits[0].bi_bh->b_data);

	gfs2_statfs_change(sdp, 0, +1, -1);
	gfs2_trans_add_rg(rgd);
}


void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip)
{
	gfs2_free_uninit_di(rgd, ip->i_num.no_addr);
	gfs2_quota_change(ip, -1, ip->i_inode.i_uid, ip->i_inode.i_gid);
	gfs2_meta_wipe(ip, ip->i_num.no_addr, 1);
}

/**
 * gfs2_rlist_add - add a RG to a list of RGs
 * @sdp: the filesystem
 * @rlist: the list of resource groups
 * @block: the block
 *
 * Figure out what RG a block belongs to and add that RG to the list
 *
 * FIXME: Don't use NOFAIL
 *
 */

void gfs2_rlist_add(struct gfs2_sbd *sdp, struct gfs2_rgrp_list *rlist,
		    u64 block)
{
	struct gfs2_rgrpd *rgd;
	struct gfs2_rgrpd **tmp;
	unsigned int new_space;
	unsigned int x;

	if (gfs2_assert_warn(sdp, !rlist->rl_ghs))
		return;

	rgd = gfs2_blk2rgrpd(sdp, block);
	if (!rgd) {
		if (gfs2_consist(sdp))
			fs_err(sdp, "block = %llu\n", (unsigned long long)block);
		return;
	}

	for (x = 0; x < rlist->rl_rgrps; x++)
		if (rlist->rl_rgd[x] == rgd)
			return;

	if (rlist->rl_rgrps == rlist->rl_space) {
		new_space = rlist->rl_space + 10;

		tmp = kcalloc(new_space, sizeof(struct gfs2_rgrpd *),
			      GFP_NOFS | __GFP_NOFAIL);

		if (rlist->rl_rgd) {
			memcpy(tmp, rlist->rl_rgd,
			       rlist->rl_space * sizeof(struct gfs2_rgrpd *));
			kfree(rlist->rl_rgd);
		}

		rlist->rl_space = new_space;
		rlist->rl_rgd = tmp;
	}

	rlist->rl_rgd[rlist->rl_rgrps++] = rgd;
}

/**
 * gfs2_rlist_alloc - all RGs have been added to the rlist, now allocate
 *      and initialize an array of glock holders for them
 * @rlist: the list of resource groups
 * @state: the lock state to acquire the RG lock in
 * @flags: the modifier flags for the holder structures
 *
 * FIXME: Don't use NOFAIL
 *
 */

void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist, unsigned int state,
		      int flags)
{
	unsigned int x;

	rlist->rl_ghs = kcalloc(rlist->rl_rgrps, sizeof(struct gfs2_holder),
				GFP_NOFS | __GFP_NOFAIL);
	for (x = 0; x < rlist->rl_rgrps; x++)
		gfs2_holder_init(rlist->rl_rgd[x]->rd_gl,
				state, flags,
				&rlist->rl_ghs[x]);
}

/**
 * gfs2_rlist_free - free a resource group list
 * @list: the list of resource groups
 *
 */

void gfs2_rlist_free(struct gfs2_rgrp_list *rlist)
{
	unsigned int x;

	kfree(rlist->rl_rgd);

	if (rlist->rl_ghs) {
		for (x = 0; x < rlist->rl_rgrps; x++)
			gfs2_holder_uninit(&rlist->rl_ghs[x]);
		kfree(rlist->rl_ghs);
	}
}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-21 21:24:53 -0500