rgrp.c 45.7 KB
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/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
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 * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
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 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
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 * of the GNU General Public License version 2.
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 */

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
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#include <linux/fs.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/prefetch.h>
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#include <linux/blkdev.h>
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#include "gfs2.h"
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#include "incore.h"
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#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"
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#include "util.h"
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#include "log.h"
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#include "inode.h"
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#include "trace_gfs2.h"
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#define BFITNOENT ((u32)~0)
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#define NO_BLOCK ((u64)~0)
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#if BITS_PER_LONG == 32
#define LBITMASK   (0x55555555UL)
#define LBITSKIP55 (0x55555555UL)
#define LBITSKIP00 (0x00000000UL)
#else
#define LBITMASK   (0x5555555555555555UL)
#define LBITSKIP55 (0x5555555555555555UL)
#define LBITSKIP00 (0x0000000000000000UL)
#endif

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/*
 * These routines are used by the resource group routines (rgrp.c)
 * to keep track of block allocation.  Each block is represented by two
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 * 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)
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 */

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

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static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
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                        unsigned char old_state, unsigned char new_state,
			unsigned int *n);
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/**
 * 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
 *
 */

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static inline void gfs2_setbit(struct gfs2_rgrpd *rgd, unsigned char *buf1,
			       unsigned char *buf2, unsigned int offset,
			       unsigned int buflen, u32 block,
			       unsigned char new_state)
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{
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	unsigned char *byte1, *byte2, *end, cur_state;
	const unsigned int bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;
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	byte1 = buf1 + offset + (block / GFS2_NBBY);
	end = buf1 + offset + buflen;
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	BUG_ON(byte1 >= end);
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	cur_state = (*byte1 >> bit) & GFS2_BIT_MASK;
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	if (unlikely(!valid_change[new_state * 4 + cur_state])) {
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		gfs2_consist_rgrpd(rgd);
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		return;
	}
	*byte1 ^= (cur_state ^ new_state) << bit;

	if (buf2) {
		byte2 = buf2 + offset + (block / GFS2_NBBY);
		cur_state = (*byte2 >> bit) & GFS2_BIT_MASK;
		*byte2 ^= (cur_state ^ new_state) << bit;
	}
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}

/**
 * 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
 *
 */

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

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/**
 * gfs2_bit_search
 * @ptr: Pointer to bitmap data
 * @mask: Mask to use (normally 0x55555.... but adjusted for search start)
 * @state: The state we are searching for
 *
 * We xor the bitmap data with a patter which is the bitwise opposite
 * of what we are looking for, this gives rise to a pattern of ones
 * wherever there is a match. Since we have two bits per entry, we
 * take this pattern, shift it down by one place and then and it with
 * the original. All the even bit positions (0,2,4, etc) then represent
 * successful matches, so we mask with 0x55555..... to remove the unwanted
 * odd bit positions.
 *
 * This allows searching of a whole u64 at once (32 blocks) with a
 * single test (on 64 bit arches).
 */

static inline u64 gfs2_bit_search(const __le64 *ptr, u64 mask, u8 state)
{
	u64 tmp;
	static const u64 search[] = {
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		[0] = 0xffffffffffffffffULL,
		[1] = 0xaaaaaaaaaaaaaaaaULL,
		[2] = 0x5555555555555555ULL,
		[3] = 0x0000000000000000ULL,
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	};
	tmp = le64_to_cpu(*ptr) ^ search[state];
	tmp &= (tmp >> 1);
	tmp &= mask;
	return tmp;
}

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/**
 * 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
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 * @len: the length (in bytes) of the buffer
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 * @goal: start search at this block's bit-pair (within @buffer)
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 * @state: GFS2_BLKST_XXX the state of the block we're looking for.
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 *
 * 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
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 * beginning of a bitmap block buffer, skipping any header structures, but
 * headers are always a multiple of 64 bits long so that the buffer is
 * always aligned to a 64 bit boundary.
 *
 * The size of the buffer is in bytes, but is it assumed that it is
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 * always ok to read a complete multiple of 64 bits at the end
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 * of the block in case the end is no aligned to a natural boundary.
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 *
 * Return: the block number (bitmap buffer scope) that was found
 */

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static u32 gfs2_bitfit(const u8 *buf, const unsigned int len,
		       u32 goal, u8 state)
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{
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	u32 spoint = (goal << 1) & ((8*sizeof(u64)) - 1);
	const __le64 *ptr = ((__le64 *)buf) + (goal >> 5);
	const __le64 *end = (__le64 *)(buf + ALIGN(len, sizeof(u64)));
	u64 tmp;
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	u64 mask = 0x5555555555555555ULL;
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	u32 bit;

	BUG_ON(state > 3);

	/* Mask off bits we don't care about at the start of the search */
	mask <<= spoint;
	tmp = gfs2_bit_search(ptr, mask, state);
	ptr++;
	while(tmp == 0 && ptr < end) {
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		tmp = gfs2_bit_search(ptr, 0x5555555555555555ULL, state);
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		ptr++;
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	}
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	/* Mask off any bits which are more than len bytes from the start */
	if (ptr == end && (len & (sizeof(u64) - 1)))
		tmp &= (((u64)~0) >> (64 - 8*(len & (sizeof(u64) - 1))));
	/* Didn't find anything, so return */
	if (tmp == 0)
		return BFITNOENT;
	ptr--;
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	bit = __ffs64(tmp);
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	bit /= 2;	/* two bits per entry in the bitmap */
	return (((const unsigned char *)ptr - buf) * GFS2_NBBY) + bit;
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}

/**
 * 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
 */

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static u32 gfs2_bitcount(struct gfs2_rgrpd *rgd, const u8 *buffer,
			 unsigned int buflen, u8 state)
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{
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	const u8 *byte = buffer;
	const u8 *end = buffer + buflen;
	const u8 state1 = state << 2;
	const u8 state2 = state << 4;
	const u8 state3 = state << 6;
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	u32 count = 0;
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	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;
}

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/**
 * 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;
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	u32 length = rgd->rd_length;
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	u32 count[4], tmp;
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	int buf, x;

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

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

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	tmp = rgd->rd_data - rgd->rd_free - rgd->rd_dinodes;
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	if (count[1] != tmp) {
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		if (gfs2_consist_rgrpd(rgd))
			fs_err(sdp, "used data mismatch:  %u != %u\n",
			       count[1], tmp);
		return;
	}

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	if (count[2] + count[3] != rgd->rd_dinodes) {
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		if (gfs2_consist_rgrpd(rgd))
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			fs_err(sdp, "used metadata mismatch:  %u != %u\n",
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			       count[2] + count[3], rgd->rd_dinodes);
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		return;
	}
}

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static inline int rgrp_contains_block(struct gfs2_rgrpd *rgd, u64 block)
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{
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	u64 first = rgd->rd_data0;
	u64 last = first + rgd->rd_data;
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	return first <= block && block < last;
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}

/**
 * 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
 */

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

	spin_lock(&sdp->sd_rindex_spin);

	list_for_each_entry(rgd, &sdp->sd_rindex_mru_list, rd_list_mru) {
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		if (rgrp_contains_block(rgd, blk)) {
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			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;
	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) {
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			gl->gl_object = NULL;
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			gfs2_glock_put(gl);
		}

		kfree(rgd->rd_bits);
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		kmem_cache_free(gfs2_rgrpd_cachep, rgd);
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	}
}

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

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static void gfs2_rindex_print(const struct gfs2_rgrpd *rgd)
{
	printk(KERN_INFO "  ri_addr = %llu\n", (unsigned long long)rgd->rd_addr);
	printk(KERN_INFO "  ri_length = %u\n", rgd->rd_length);
	printk(KERN_INFO "  ri_data0 = %llu\n", (unsigned long long)rgd->rd_data0);
	printk(KERN_INFO "  ri_data = %u\n", rgd->rd_data);
	printk(KERN_INFO "  ri_bitbytes = %u\n", rgd->rd_bitbytes);
}

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/**
 * 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;
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	u32 length = rgd->rd_length; /* # blocks in hdr & bitmap */
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	u32 bytes_left, bytes;
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	int x;

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	if (!length)
		return -EINVAL;

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

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

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		bi->bi_flags = 0;
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		/* 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);
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			bi->bi_start = rgd->rd_bitbytes - bytes_left;
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			bi->bi_len = bytes;
		/* other blocks */
		} else {
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			bytes = sdp->sd_sb.sb_bsize -
				sizeof(struct gfs2_meta_header);
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			bi->bi_offset = sizeof(struct gfs2_meta_header);
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			bi->bi_start = rgd->rd_bitbytes - bytes_left;
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			bi->bi_len = bytes;
		}

		bytes_left -= bytes;
	}

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

	return 0;
}

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/**
 * gfs2_ri_total - Total up the file system space, according to the rindex.
 *
 */
u64 gfs2_ri_total(struct gfs2_sbd *sdp)
{
	u64 total_data = 0;	
	struct inode *inode = sdp->sd_rindex;
	struct gfs2_inode *ip = GFS2_I(inode);
	char buf[sizeof(struct gfs2_rindex)];
	struct file_ra_state ra_state;
	int error, rgrps;

	mutex_lock(&sdp->sd_rindex_mutex);
	file_ra_state_init(&ra_state, inode->i_mapping);
	for (rgrps = 0;; rgrps++) {
		loff_t pos = rgrps * sizeof(struct gfs2_rindex);

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		if (pos + sizeof(struct gfs2_rindex) >= i_size_read(inode))
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			break;
		error = gfs2_internal_read(ip, &ra_state, buf, &pos,
					   sizeof(struct gfs2_rindex));
		if (error != sizeof(struct gfs2_rindex))
			break;
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		total_data += be32_to_cpu(((struct gfs2_rindex *)buf)->ri_data);
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	}
	mutex_unlock(&sdp->sd_rindex_mutex);
	return total_data;
}

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static void gfs2_rindex_in(struct gfs2_rgrpd *rgd, const void *buf)
{
	const struct gfs2_rindex *str = buf;

	rgd->rd_addr = be64_to_cpu(str->ri_addr);
	rgd->rd_length = be32_to_cpu(str->ri_length);
	rgd->rd_data0 = be64_to_cpu(str->ri_data0);
	rgd->rd_data = be32_to_cpu(str->ri_data);
	rgd->rd_bitbytes = be32_to_cpu(str->ri_bitbytes);
}

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

static int read_rindex_entry(struct gfs2_inode *ip,
			     struct file_ra_state *ra_state)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	loff_t pos = sdp->sd_rgrps * sizeof(struct gfs2_rindex);
	char buf[sizeof(struct gfs2_rindex)];
	int error;
	struct gfs2_rgrpd *rgd;

	error = gfs2_internal_read(ip, ra_state, buf, &pos,
				   sizeof(struct gfs2_rindex));
	if (!error)
		return 0;
	if (error != sizeof(struct gfs2_rindex)) {
		if (error > 0)
			error = -EIO;
		return error;
	}

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	rgd = kmem_cache_zalloc(gfs2_rgrpd_cachep, GFP_NOFS);
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	error = -ENOMEM;
	if (!rgd)
		return error;

	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);

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	gfs2_rindex_in(rgd, buf);
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	error = compute_bitstructs(rgd);
	if (error)
		return error;

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	error = gfs2_glock_get(sdp, rgd->rd_addr,
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			       &gfs2_rgrp_glops, CREATE, &rgd->rd_gl);
	if (error)
		return error;

	rgd->rd_gl->gl_object = rgd;
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	rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
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	return error;
}

/**
 * gfs2_ri_update - Pull in a new resource index from the disk
 * @ip: pointer to the rindex inode
 *
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 * Returns: 0 on successful update, error code otherwise
 */

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int gfs2_ri_update(struct gfs2_inode *ip)
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{
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	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct inode *inode = &ip->i_inode;
590
	struct file_ra_state ra_state;
S
Steven Whitehouse 已提交
591
	u64 rgrp_count = i_size_read(inode);
B
Benjamin Marzinski 已提交
592 593
	struct gfs2_rgrpd *rgd;
	unsigned int max_data = 0;
D
David Teigland 已提交
594 595
	int error;

S
Steven Whitehouse 已提交
596
	do_div(rgrp_count, sizeof(struct gfs2_rindex));
D
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597 598
	clear_rgrpdi(sdp);

599
	file_ra_state_init(&ra_state, inode->i_mapping);
600
	for (sdp->sd_rgrps = 0; sdp->sd_rgrps < rgrp_count; sdp->sd_rgrps++) {
601 602 603 604
		error = read_rindex_entry(ip, &ra_state);
		if (error) {
			clear_rgrpdi(sdp);
			return error;
D
David Teigland 已提交
605
		}
606
	}
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David Teigland 已提交
607

B
Benjamin Marzinski 已提交
608 609 610 611
	list_for_each_entry(rgd, &sdp->sd_rindex_list, rd_list)
		if (rgd->rd_data > max_data)
			max_data = rgd->rd_data;
	sdp->sd_max_rg_data = max_data;
612
	sdp->sd_rindex_uptodate = 1;
613 614
	return 0;
}
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615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635

/**
 * 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)
{
636
	struct gfs2_inode *ip = GFS2_I(sdp->sd_rindex);
D
David Teigland 已提交
637 638 639 640 641 642 643 644
	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 */
645
	if (!sdp->sd_rindex_uptodate) {
646
		mutex_lock(&sdp->sd_rindex_mutex);
647
		if (!sdp->sd_rindex_uptodate) {
D
David Teigland 已提交
648 649 650 651
			error = gfs2_ri_update(ip);
			if (error)
				gfs2_glock_dq_uninit(ri_gh);
		}
652
		mutex_unlock(&sdp->sd_rindex_mutex);
D
David Teigland 已提交
653 654 655 656 657
	}

	return error;
}

658
static void gfs2_rgrp_in(struct gfs2_rgrpd *rgd, const void *buf)
659 660
{
	const struct gfs2_rgrp *str = buf;
661
	u32 rg_flags;
662

663
	rg_flags = be32_to_cpu(str->rg_flags);
664
	rg_flags &= ~GFS2_RDF_MASK;
665 666
	rgd->rd_flags &= GFS2_RDF_MASK;
	rgd->rd_flags |= rg_flags;
667
	rgd->rd_free = be32_to_cpu(str->rg_free);
668
	rgd->rd_dinodes = be32_to_cpu(str->rg_dinodes);
669
	rgd->rd_igeneration = be64_to_cpu(str->rg_igeneration);
670 671
}

672
static void gfs2_rgrp_out(struct gfs2_rgrpd *rgd, void *buf)
673 674 675
{
	struct gfs2_rgrp *str = buf;

676
	str->rg_flags = cpu_to_be32(rgd->rd_flags & ~GFS2_RDF_MASK);
677
	str->rg_free = cpu_to_be32(rgd->rd_free);
678
	str->rg_dinodes = cpu_to_be32(rgd->rd_dinodes);
679
	str->__pad = cpu_to_be32(0);
680
	str->rg_igeneration = cpu_to_be64(rgd->rd_igeneration);
681 682 683
	memset(&str->rg_reserved, 0, sizeof(str->rg_reserved));
}

D
David Teigland 已提交
684 685 686 687 688 689 690 691 692 693 694 695 696 697
/**
 * 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;
698
	unsigned int length = rgd->rd_length;
D
David Teigland 已提交
699 700 701 702
	struct gfs2_bitmap *bi;
	unsigned int x, y;
	int error;

703
	mutex_lock(&rgd->rd_mutex);
D
David Teigland 已提交
704 705 706 707 708

	spin_lock(&sdp->sd_rindex_spin);
	if (rgd->rd_bh_count) {
		rgd->rd_bh_count++;
		spin_unlock(&sdp->sd_rindex_spin);
709
		mutex_unlock(&rgd->rd_mutex);
D
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710 711 712 713 714 715
		return 0;
	}
	spin_unlock(&sdp->sd_rindex_spin);

	for (x = 0; x < length; x++) {
		bi = rgd->rd_bits + x;
716
		error = gfs2_meta_read(gl, rgd->rd_addr + x, 0, &bi->bi_bh);
D
David Teigland 已提交
717 718 719 720 721 722
		if (error)
			goto fail;
	}

	for (y = length; y--;) {
		bi = rgd->rd_bits + y;
S
Steven Whitehouse 已提交
723
		error = gfs2_meta_wait(sdp, bi->bi_bh);
D
David Teigland 已提交
724 725
		if (error)
			goto fail;
726
		if (gfs2_metatype_check(sdp, bi->bi_bh, y ? GFS2_METATYPE_RB :
D
David Teigland 已提交
727 728 729 730 731 732
					      GFS2_METATYPE_RG)) {
			error = -EIO;
			goto fail;
		}
	}

733
	if (!(rgd->rd_flags & GFS2_RDF_UPTODATE)) {
734 735
		for (x = 0; x < length; x++)
			clear_bit(GBF_FULL, &rgd->rd_bits[x].bi_flags);
736
		gfs2_rgrp_in(rgd, (rgd->rd_bits[0].bi_bh)->b_data);
737
		rgd->rd_flags |= (GFS2_RDF_UPTODATE | GFS2_RDF_CHECK);
D
David Teigland 已提交
738 739 740
	}

	spin_lock(&sdp->sd_rindex_spin);
741
	rgd->rd_free_clone = rgd->rd_free;
D
David Teigland 已提交
742 743 744
	rgd->rd_bh_count++;
	spin_unlock(&sdp->sd_rindex_spin);

745
	mutex_unlock(&rgd->rd_mutex);
D
David Teigland 已提交
746 747 748

	return 0;

749
fail:
D
David Teigland 已提交
750 751 752 753 754 755
	while (x--) {
		bi = rgd->rd_bits + x;
		brelse(bi->bi_bh);
		bi->bi_bh = NULL;
		gfs2_assert_warn(sdp, !bi->bi_clone);
	}
756
	mutex_unlock(&rgd->rd_mutex);
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David Teigland 已提交
757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779

	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;
780
	int x, length = rgd->rd_length;
D
David Teigland 已提交
781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799

	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);
}

800 801 802 803 804 805
static void gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
				    const struct gfs2_bitmap *bi)
{
	struct super_block *sb = sdp->sd_vfs;
	struct block_device *bdev = sb->s_bdev;
	const unsigned int sects_per_blk = sdp->sd_sb.sb_bsize /
806
					   bdev_logical_block_size(sb->s_bdev);
807
	u64 blk;
808
	sector_t start = 0;
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827
	sector_t nr_sects = 0;
	int rv;
	unsigned int x;

	for (x = 0; x < bi->bi_len; x++) {
		const u8 *orig = bi->bi_bh->b_data + bi->bi_offset + x;
		const u8 *clone = bi->bi_clone + bi->bi_offset + x;
		u8 diff = ~(*orig | (*orig >> 1)) & (*clone | (*clone >> 1));
		diff &= 0x55;
		if (diff == 0)
			continue;
		blk = offset + ((bi->bi_start + x) * GFS2_NBBY);
		blk *= sects_per_blk; /* convert to sectors */
		while(diff) {
			if (diff & 1) {
				if (nr_sects == 0)
					goto start_new_extent;
				if ((start + nr_sects) != blk) {
					rv = blkdev_issue_discard(bdev, start,
828
							    nr_sects, GFP_NOFS,
829
							    0);
830 831 832 833 834 835 836 837 838 839 840 841 842
					if (rv)
						goto fail;
					nr_sects = 0;
start_new_extent:
					start = blk;
				}
				nr_sects += sects_per_blk;
			}
			diff >>= 2;
			blk += sects_per_blk;
		}
	}
	if (nr_sects) {
843
		rv = blkdev_issue_discard(bdev, start, nr_sects, GFP_NOFS, 0);
844 845 846 847 848 849 850 851 852
		if (rv)
			goto fail;
	}
	return;
fail:
	fs_warn(sdp, "error %d on discard request, turning discards off for this filesystem", rv);
	sdp->sd_args.ar_discard = 0;
}

D
David Teigland 已提交
853 854 855
void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
856
	unsigned int length = rgd->rd_length;
D
David Teigland 已提交
857 858 859 860 861 862
	unsigned int x;

	for (x = 0; x < length; x++) {
		struct gfs2_bitmap *bi = rgd->rd_bits + x;
		if (!bi->bi_clone)
			continue;
863 864
		if (sdp->sd_args.ar_discard)
			gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bi);
865
		clear_bit(GBF_FULL, &bi->bi_flags);
D
David Teigland 已提交
866
		memcpy(bi->bi_clone + bi->bi_offset,
867
		       bi->bi_bh->b_data + bi->bi_offset, bi->bi_len);
D
David Teigland 已提交
868 869 870
	}

	spin_lock(&sdp->sd_rindex_spin);
871
	rgd->rd_free_clone = rgd->rd_free;
D
David Teigland 已提交
872 873 874 875 876 877 878 879 880 881 882 883
	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)
{
884
	BUG_ON(ip->i_alloc != NULL);
885
	ip->i_alloc = kzalloc(sizeof(struct gfs2_alloc), GFP_NOFS);
886
	return ip->i_alloc;
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David Teigland 已提交
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904
}

/**
 * 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;

905
	if (rgd->rd_flags & (GFS2_RGF_NOALLOC | GFS2_RDF_ERROR))
906 907
		return 0;

D
David Teigland 已提交
908 909 910 911 912 913 914 915 916 917
	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;
}

918 919 920 921
/**
 * try_rgrp_unlink - Look for any unlinked, allocated, but unused inodes
 * @rgd: The rgrp
 *
B
Bob Peterson 已提交
922 923
 * Returns: 0 if no error
 *          The inode, if one has been found, in inode.
924 925
 */

926
static void try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked, u64 skip)
927
{
928
	u32 goal = 0, block;
929
	u64 no_addr;
930
	struct gfs2_sbd *sdp = rgd->rd_sbd;
931
	unsigned int n;
932 933 934 935
	struct gfs2_glock *gl;
	struct gfs2_inode *ip;
	int error;
	int found = 0;
936

937
	while (goal < rgd->rd_data) {
938
		down_write(&sdp->sd_log_flush_lock);
939
		n = 1;
940
		block = rgblk_search(rgd, goal, GFS2_BLKST_UNLINKED,
941
				     GFS2_BLKST_UNLINKED, &n);
942
		up_write(&sdp->sd_log_flush_lock);
943
		if (block == BFITNOENT)
944
			break;
945 946 947
		/* rgblk_search can return a block < goal, so we need to
		   keep it marching forward. */
		no_addr = block + rgd->rd_data0;
948
		goal++;
949
		if (*last_unlinked != NO_BLOCK && no_addr <= *last_unlinked)
950
			continue;
951 952
		if (no_addr == skip)
			continue;
953
		*last_unlinked = no_addr;
954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975

		error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &gl);
		if (error)
			continue;

		/* If the inode is already in cache, we can ignore it here
		 * because the existing inode disposal code will deal with
		 * it when all refs have gone away. Accessing gl_object like
		 * this is not safe in general. Here it is ok because we do
		 * not dereference the pointer, and we only need an approx
		 * answer to whether it is NULL or not.
		 */
		ip = gl->gl_object;

		if (ip || queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
			gfs2_glock_put(gl);
		else
			found++;

		/* Limit reclaim to sensible number of tasks */
		if (found > 2*NR_CPUS)
			return;
976 977 978
	}

	rgd->rd_flags &= ~GFS2_RDF_CHECK;
979
	return;
980 981
}

D
David Teigland 已提交
982 983 984 985 986 987 988
/**
 * recent_rgrp_next - get next RG from "recent" list
 * @cur_rgd: current rgrp
 *
 * Returns: The next rgrp in the recent list
 */

989
static struct gfs2_rgrpd *recent_rgrp_next(struct gfs2_rgrpd *cur_rgd)
D
David Teigland 已提交
990 991 992 993 994 995
{
	struct gfs2_sbd *sdp = cur_rgd->rd_sbd;
	struct list_head *head;
	struct gfs2_rgrpd *rgd;

	spin_lock(&sdp->sd_rindex_spin);
996 997 998 999
	head = &sdp->sd_rindex_mru_list;
	if (unlikely(cur_rgd->rd_list_mru.next == head)) {
		spin_unlock(&sdp->sd_rindex_spin);
		return NULL;
D
David Teigland 已提交
1000
	}
1001
	rgd = list_entry(cur_rgd->rd_list_mru.next, struct gfs2_rgrpd, rd_list_mru);
D
David Teigland 已提交
1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025
	spin_unlock(&sdp->sd_rindex_spin);
	return rgd;
}

/**
 * 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;

S
Steven Whitehouse 已提交
1026
		for (x = 0, rgd = gfs2_rgrpd_get_first(sdp); x < rg;
D
David Teigland 已提交
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061
		     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
 */

1062
static int get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
D
David Teigland 已提交
1063
{
1064
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
D
David Teigland 已提交
1065
	struct gfs2_rgrpd *rgd, *begin = NULL;
1066
	struct gfs2_alloc *al = ip->i_alloc;
D
David Teigland 已提交
1067 1068 1069
	int flags = LM_FLAG_TRY;
	int skipped = 0;
	int loops = 0;
1070
	int error, rg_locked;
D
David Teigland 已提交
1071

1072
	rgd = gfs2_blk2rgrpd(sdp, ip->i_goal);
D
David Teigland 已提交
1073 1074

	while (rgd) {
1075 1076 1077 1078 1079 1080 1081 1082 1083
		rg_locked = 0;

		if (gfs2_glock_is_locked_by_me(rgd->rd_gl)) {
			rg_locked = 1;
			error = 0;
		} else {
			error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
						   LM_FLAG_TRY, &al->al_rgd_gh);
		}
D
David Teigland 已提交
1084 1085 1086 1087
		switch (error) {
		case 0:
			if (try_rgrp_fit(rgd, al))
				goto out;
1088 1089
			if (rgd->rd_flags & GFS2_RDF_CHECK)
				try_rgrp_unlink(rgd, last_unlinked, ip->i_no_addr);
1090 1091
			if (!rg_locked)
				gfs2_glock_dq_uninit(&al->al_rgd_gh);
1092
			/* fall through */
D
David Teigland 已提交
1093
		case GLR_TRYFAILED:
1094
			rgd = recent_rgrp_next(rgd);
D
David Teigland 已提交
1095 1096 1097
			break;

		default:
1098
			return error;
D
David Teigland 已提交
1099 1100 1101 1102 1103 1104 1105 1106
		}
	}

	/* Go through full list of rgrps */

	begin = rgd = forward_rgrp_get(sdp);

	for (;;) {
1107 1108 1109 1110 1111 1112 1113 1114 1115
		rg_locked = 0;

		if (gfs2_glock_is_locked_by_me(rgd->rd_gl)) {
			rg_locked = 1;
			error = 0;
		} else {
			error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, flags,
						   &al->al_rgd_gh);
		}
D
David Teigland 已提交
1116 1117 1118 1119
		switch (error) {
		case 0:
			if (try_rgrp_fit(rgd, al))
				goto out;
1120 1121
			if (rgd->rd_flags & GFS2_RDF_CHECK)
				try_rgrp_unlink(rgd, last_unlinked, ip->i_no_addr);
1122 1123
			if (!rg_locked)
				gfs2_glock_dq_uninit(&al->al_rgd_gh);
D
David Teigland 已提交
1124 1125 1126 1127 1128 1129 1130
			break;

		case GLR_TRYFAILED:
			skipped++;
			break;

		default:
1131
			return error;
D
David Teigland 已提交
1132 1133 1134 1135 1136 1137 1138
		}

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

		if (rgd == begin) {
1139
			if (++loops >= 3)
1140
				return -ENOSPC;
1141 1142
			if (!skipped)
				loops++;
D
David Teigland 已提交
1143
			flags = 0;
1144 1145
			if (loops == 2)
				gfs2_log_flush(sdp, NULL);
D
David Teigland 已提交
1146 1147 1148
		}
	}

1149
out:
D
David Teigland 已提交
1150
	if (begin) {
1151 1152 1153
		spin_lock(&sdp->sd_rindex_spin);
		list_move(&rgd->rd_list_mru, &sdp->sd_rindex_mru_list);
		spin_unlock(&sdp->sd_rindex_spin);
D
David Teigland 已提交
1154 1155 1156 1157 1158 1159
		rgd = gfs2_rgrpd_get_next(rgd);
		if (!rgd)
			rgd = gfs2_rgrpd_get_first(sdp);
		forward_rgrp_set(sdp, rgd);
	}

1160
	return 0;
D
David Teigland 已提交
1161 1162 1163 1164 1165 1166 1167 1168 1169
}

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

1170 1171
int gfs2_inplace_reserve_i(struct gfs2_inode *ip, int hold_rindex,
			   char *file, unsigned int line)
D
David Teigland 已提交
1172
{
1173
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1174
	struct gfs2_alloc *al = ip->i_alloc;
1175
	int error = 0;
1176 1177
	u64 last_unlinked = NO_BLOCK;
	int tries = 0;
D
David Teigland 已提交
1178 1179 1180 1181

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

1182 1183 1184 1185 1186 1187 1188
	if (hold_rindex) {
		/* We need to hold the rindex unless the inode we're using is
		   the rindex itself, in which case it's already held. */
		if (ip != GFS2_I(sdp->sd_rindex))
			error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
		else if (!sdp->sd_rgrps) /* We may not have the rindex read
					    in, so: */
1189
			error = gfs2_ri_update(ip);
1190 1191
		if (error)
			return error;
1192
	}
1193

1194
try_again:
1195 1196 1197
	do {
		error = get_local_rgrp(ip, &last_unlinked);
		/* If there is no space, flushing the log may release some */
1198 1199 1200 1201 1202 1203 1204 1205
		if (error) {
			if (ip == GFS2_I(sdp->sd_rindex) &&
			    !sdp->sd_rindex_uptodate) {
				error = gfs2_ri_update(ip);
				if (error)
					return error;
				goto try_again;
			}
1206
			gfs2_log_flush(sdp, NULL);
1207
		}
1208
	} while (error && tries++ < 3);
D
David Teigland 已提交
1209

1210
	if (error) {
1211
		if (hold_rindex && ip != GFS2_I(sdp->sd_rindex))
1212
			gfs2_glock_dq_uninit(&al->al_ri_gh);
1213
		return error;
D
David Teigland 已提交
1214
	}
1215

1216
	/* no error, so we have the rgrp set in the inode's allocation. */
D
David Teigland 已提交
1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231
	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)
{
1232
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1233
	struct gfs2_alloc *al = ip->i_alloc;
D
David Teigland 已提交
1234 1235 1236 1237 1238 1239 1240 1241

	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;
1242 1243
	if (al->al_rgd_gh.gh_gl)
		gfs2_glock_dq_uninit(&al->al_rgd_gh);
1244
	if (ip != GFS2_I(sdp->sd_rindex) && al->al_ri_gh.gh_gl)
1245
		gfs2_glock_dq_uninit(&al->al_ri_gh);
D
David Teigland 已提交
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255
}

/**
 * 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_*)
 */

1256
static unsigned char gfs2_get_block_type(struct gfs2_rgrpd *rgd, u64 block)
D
David Teigland 已提交
1257 1258
{
	struct gfs2_bitmap *bi = NULL;
1259
	u32 length, rgrp_block, buf_block;
D
David Teigland 已提交
1260 1261 1262
	unsigned int buf;
	unsigned char type;

1263 1264
	length = rgd->rd_length;
	rgrp_block = block - rgd->rd_data0;
D
David Teigland 已提交
1265 1266 1267 1268 1269 1270 1271 1272 1273 1274

	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;

1275
	type = gfs2_testbit(rgd, bi->bi_bh->b_data + bi->bi_offset,
D
David Teigland 已提交
1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287
			   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
1288
 * @n: The extent length
D
David Teigland 已提交
1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
 *
 * 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
 */

1303
static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
1304 1305
			unsigned char old_state, unsigned char new_state,
			unsigned int *n)
D
David Teigland 已提交
1306 1307
{
	struct gfs2_bitmap *bi = NULL;
1308
	const u32 length = rgd->rd_length;
1309
	u32 blk = BFITNOENT;
D
David Teigland 已提交
1310
	unsigned int buf, x;
1311
	const unsigned int elen = *n;
1312
	const u8 *buffer = NULL;
D
David Teigland 已提交
1313

1314
	*n = 0;
D
David Teigland 已提交
1315 1316 1317
	/* Find bitmap block that contains bits for goal block */
	for (buf = 0; buf < length; buf++) {
		bi = rgd->rd_bits + buf;
1318 1319 1320 1321 1322
		/* Convert scope of "goal" from rgrp-wide to within found bit block */
		if (goal < (bi->bi_start + bi->bi_len) * GFS2_NBBY) {
			goal -= bi->bi_start * GFS2_NBBY;
			goto do_search;
		}
D
David Teigland 已提交
1323
	}
1324 1325
	buf = 0;
	goal = 0;
D
David Teigland 已提交
1326

1327
do_search:
D
David Teigland 已提交
1328 1329 1330 1331 1332 1333
	/* 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++) {
1334 1335 1336 1337 1338 1339
		bi = rgd->rd_bits + buf;

		if (test_bit(GBF_FULL, &bi->bi_flags) &&
		    (old_state == GFS2_BLKST_FREE))
			goto skip;

1340 1341
		/* The GFS2_BLKST_UNLINKED state doesn't apply to the clone
		   bitmaps, so we must search the originals for that. */
1342
		buffer = bi->bi_bh->b_data + bi->bi_offset;
1343
		if (old_state != GFS2_BLKST_UNLINKED && bi->bi_clone)
1344 1345 1346
			buffer = bi->bi_clone + bi->bi_offset;

		blk = gfs2_bitfit(buffer, bi->bi_len, goal, old_state);
D
David Teigland 已提交
1347 1348 1349
		if (blk != BFITNOENT)
			break;

1350 1351 1352
		if ((goal == 0) && (old_state == GFS2_BLKST_FREE))
			set_bit(GBF_FULL, &bi->bi_flags);

D
David Teigland 已提交
1353
		/* Try next bitmap block (wrap back to rgrp header if at end) */
1354 1355 1356
skip:
		buf++;
		buf %= length;
D
David Teigland 已提交
1357 1358 1359
		goal = 0;
	}

1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376
	if (blk == BFITNOENT)
		return blk;
	*n = 1;
	if (old_state == new_state)
		goto out;

	gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
	gfs2_setbit(rgd, bi->bi_bh->b_data, bi->bi_clone, bi->bi_offset,
		    bi->bi_len, blk, new_state);
	goal = blk;
	while (*n < elen) {
		goal++;
		if (goal >= (bi->bi_len * GFS2_NBBY))
			break;
		if (gfs2_testbit(rgd, buffer, bi->bi_len, goal) !=
		    GFS2_BLKST_FREE)
			break;
1377
		gfs2_setbit(rgd, bi->bi_bh->b_data, bi->bi_clone, bi->bi_offset,
1378 1379
			    bi->bi_len, goal, new_state);
		(*n)++;
1380
	}
1381 1382
out:
	return (bi->bi_start * GFS2_NBBY) + blk;
D
David Teigland 已提交
1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394
}

/**
 * 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)
 */

1395 1396
static struct gfs2_rgrpd *rgblk_free(struct gfs2_sbd *sdp, u64 bstart,
				     u32 blen, unsigned char new_state)
D
David Teigland 已提交
1397 1398 1399
{
	struct gfs2_rgrpd *rgd;
	struct gfs2_bitmap *bi = NULL;
1400
	u32 length, rgrp_blk, buf_blk;
D
David Teigland 已提交
1401 1402 1403 1404 1405
	unsigned int buf;

	rgd = gfs2_blk2rgrpd(sdp, bstart);
	if (!rgd) {
		if (gfs2_consist(sdp))
1406
			fs_err(sdp, "block = %llu\n", (unsigned long long)bstart);
D
David Teigland 已提交
1407 1408 1409
		return NULL;
	}

1410
	length = rgd->rd_length;
D
David Teigland 已提交
1411

1412
	rgrp_blk = bstart - rgd->rd_data0;
D
David Teigland 已提交
1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427

	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,
1428
					       GFP_NOFS | __GFP_NOFAIL);
D
David Teigland 已提交
1429 1430 1431 1432
			memcpy(bi->bi_clone + bi->bi_offset,
			       bi->bi_bh->b_data + bi->bi_offset,
			       bi->bi_len);
		}
1433
		gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
1434
		gfs2_setbit(rgd, bi->bi_bh->b_data, NULL, bi->bi_offset,
D
David Teigland 已提交
1435 1436 1437 1438 1439 1440 1441
			    bi->bi_len, buf_blk, new_state);
	}

	return rgd;
}

/**
1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458
 * gfs2_rgrp_dump - print out an rgrp
 * @seq: The iterator
 * @gl: The glock in question
 *
 */

int gfs2_rgrp_dump(struct seq_file *seq, const struct gfs2_glock *gl)
{
	const struct gfs2_rgrpd *rgd = gl->gl_object;
	if (rgd == NULL)
		return 0;
	gfs2_print_dbg(seq, " R: n:%llu f:%02x b:%u/%u i:%u\n",
		       (unsigned long long)rgd->rd_addr, rgd->rd_flags,
		       rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes);
	return 0;
}

1459 1460 1461 1462
static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
{
	struct gfs2_sbd *sdp = rgd->rd_sbd;
	fs_warn(sdp, "rgrp %llu has an error, marking it readonly until umount\n",
S
Steven Whitehouse 已提交
1463
		(unsigned long long)rgd->rd_addr);
1464 1465 1466 1467 1468
	fs_warn(sdp, "umount on all nodes and run fsck.gfs2 to fix the error\n");
	gfs2_rgrp_dump(NULL, rgd->rd_gl);
	rgd->rd_flags |= GFS2_RDF_ERROR;
}

1469 1470
/**
 * gfs2_alloc_block - Allocate one or more blocks
1471
 * @ip: the inode to allocate the block for
1472 1473
 * @bn: Used to return the starting block number
 * @n: requested number of blocks/extent length (value/result)
D
David Teigland 已提交
1474
 *
1475
 * Returns: 0 or error
D
David Teigland 已提交
1476 1477
 */

1478
int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n)
D
David Teigland 已提交
1479
{
1480
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1481
	struct buffer_head *dibh;
1482
	struct gfs2_alloc *al = ip->i_alloc;
1483
	struct gfs2_rgrpd *rgd;
1484 1485
	u32 goal, blk;
	u64 block;
1486
	int error;
D
David Teigland 已提交
1487

1488 1489 1490 1491 1492 1493 1494 1495
	/* Only happens if there is a bug in gfs2, return something distinctive
	 * to ensure that it is noticed.
	 */
	if (al == NULL)
		return -ECANCELED;

	rgd = al->al_rgd;

1496 1497
	if (rgrp_contains_block(rgd, ip->i_goal))
		goal = ip->i_goal - rgd->rd_data0;
D
David Teigland 已提交
1498
	else
1499
		goal = rgd->rd_last_alloc;
D
David Teigland 已提交
1500

1501
	blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED, n);
1502 1503 1504 1505

	/* Since all blocks are reserved in advance, this shouldn't happen */
	if (blk == BFITNOENT)
		goto rgrp_error;
D
David Teigland 已提交
1506

1507
	rgd->rd_last_alloc = blk;
1508
	block = rgd->rd_data0 + blk;
1509
	ip->i_goal = block;
1510 1511 1512 1513 1514 1515 1516
	error = gfs2_meta_inode_buffer(ip, &dibh);
	if (error == 0) {
		struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
		di->di_goal_meta = di->di_goal_data = cpu_to_be64(ip->i_goal);
		brelse(dibh);
	}
1517 1518 1519
	if (rgd->rd_free < *n)
		goto rgrp_error;

1520
	rgd->rd_free -= *n;
D
David Teigland 已提交
1521

1522
	gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
1523
	gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
D
David Teigland 已提交
1524

1525
	al->al_alloced += *n;
D
David Teigland 已提交
1526

1527
	gfs2_statfs_change(sdp, 0, -(s64)*n, 0);
1528
	gfs2_quota_change(ip, *n, ip->i_inode.i_uid, ip->i_inode.i_gid);
D
David Teigland 已提交
1529 1530

	spin_lock(&sdp->sd_rindex_spin);
1531
	rgd->rd_free_clone -= *n;
D
David Teigland 已提交
1532
	spin_unlock(&sdp->sd_rindex_spin);
S
Steven Whitehouse 已提交
1533
	trace_gfs2_block_alloc(ip, block, *n, GFS2_BLKST_USED);
1534 1535 1536 1537
	*bn = block;
	return 0;

rgrp_error:
1538
	gfs2_rgrp_error(rgd);
1539
	return -EIO;
D
David Teigland 已提交
1540 1541 1542 1543 1544
}

/**
 * gfs2_alloc_di - Allocate a dinode
 * @dip: the directory that the inode is going in
1545 1546
 * @bn: the block number which is allocated
 * @generation: the generation number of the inode
D
David Teigland 已提交
1547
 *
1548
 * Returns: 0 on success or error
D
David Teigland 已提交
1549 1550
 */

1551
int gfs2_alloc_di(struct gfs2_inode *dip, u64 *bn, u64 *generation)
D
David Teigland 已提交
1552
{
1553
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
1554
	struct gfs2_alloc *al = dip->i_alloc;
D
David Teigland 已提交
1555
	struct gfs2_rgrpd *rgd = al->al_rgd;
S
Steven Whitehouse 已提交
1556 1557
	u32 blk;
	u64 block;
1558
	unsigned int n = 1;
D
David Teigland 已提交
1559

1560
	blk = rgblk_search(rgd, rgd->rd_last_alloc,
1561
			   GFS2_BLKST_FREE, GFS2_BLKST_DINODE, &n);
D
David Teigland 已提交
1562

1563 1564 1565
	/* Since all blocks are reserved in advance, this shouldn't happen */
	if (blk == BFITNOENT)
		goto rgrp_error;
D
David Teigland 已提交
1566

1567
	rgd->rd_last_alloc = blk;
1568
	block = rgd->rd_data0 + blk;
1569 1570 1571
	if (rgd->rd_free == 0)
		goto rgrp_error;

1572
	rgd->rd_free--;
1573
	rgd->rd_dinodes++;
1574
	*generation = rgd->rd_igeneration++;
1575 1576
	if (*generation == 0)
		*generation = rgd->rd_igeneration++;
1577
	gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
1578
	gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
D
David Teigland 已提交
1579 1580 1581 1582

	al->al_alloced++;

	gfs2_statfs_change(sdp, 0, -1, +1);
1583
	gfs2_trans_add_unrevoke(sdp, block, 1);
D
David Teigland 已提交
1584 1585 1586 1587

	spin_lock(&sdp->sd_rindex_spin);
	rgd->rd_free_clone--;
	spin_unlock(&sdp->sd_rindex_spin);
S
Steven Whitehouse 已提交
1588
	trace_gfs2_block_alloc(dip, block, 1, GFS2_BLKST_DINODE);
1589 1590 1591 1592 1593 1594
	*bn = block;
	return 0;

rgrp_error:
	gfs2_rgrp_error(rgd);
	return -EIO;
D
David Teigland 已提交
1595 1596 1597 1598 1599 1600 1601 1602 1603 1604
}

/**
 * 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
 *
 */

1605
void gfs2_free_data(struct gfs2_inode *ip, u64 bstart, u32 blen)
D
David Teigland 已提交
1606
{
1607
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
D
David Teigland 已提交
1608 1609 1610 1611 1612
	struct gfs2_rgrpd *rgd;

	rgd = rgblk_free(sdp, bstart, blen, GFS2_BLKST_FREE);
	if (!rgd)
		return;
S
Steven Whitehouse 已提交
1613
	trace_gfs2_block_alloc(ip, bstart, blen, GFS2_BLKST_FREE);
1614
	rgd->rd_free += blen;
D
David Teigland 已提交
1615

1616
	gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
1617
	gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
D
David Teigland 已提交
1618 1619 1620 1621

	gfs2_trans_add_rg(rgd);

	gfs2_statfs_change(sdp, 0, +blen, 0);
1622
	gfs2_quota_change(ip, -(s64)blen, ip->i_inode.i_uid, ip->i_inode.i_gid);
D
David Teigland 已提交
1623 1624 1625 1626 1627 1628 1629 1630 1631 1632
}

/**
 * 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
 *
 */

1633
void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen)
D
David Teigland 已提交
1634
{
1635
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
D
David Teigland 已提交
1636 1637 1638 1639 1640
	struct gfs2_rgrpd *rgd;

	rgd = rgblk_free(sdp, bstart, blen, GFS2_BLKST_FREE);
	if (!rgd)
		return;
S
Steven Whitehouse 已提交
1641
	trace_gfs2_block_alloc(ip, bstart, blen, GFS2_BLKST_FREE);
1642
	rgd->rd_free += blen;
D
David Teigland 已提交
1643

1644
	gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
1645
	gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
D
David Teigland 已提交
1646 1647 1648 1649

	gfs2_trans_add_rg(rgd);

	gfs2_statfs_change(sdp, 0, +blen, 0);
1650
	gfs2_quota_change(ip, -(s64)blen, ip->i_inode.i_uid, ip->i_inode.i_gid);
D
David Teigland 已提交
1651 1652 1653
	gfs2_meta_wipe(ip, bstart, blen);
}

1654 1655 1656 1657 1658
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;
1659
	u64 blkno = ip->i_no_addr;
1660 1661 1662 1663

	rgd = rgblk_free(sdp, blkno, 1, GFS2_BLKST_UNLINKED);
	if (!rgd)
		return;
S
Steven Whitehouse 已提交
1664
	trace_gfs2_block_alloc(ip, blkno, 1, GFS2_BLKST_UNLINKED);
1665
	gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
1666
	gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
1667 1668 1669
	gfs2_trans_add_rg(rgd);
}

1670
static void gfs2_free_uninit_di(struct gfs2_rgrpd *rgd, u64 blkno)
D
David Teigland 已提交
1671 1672 1673 1674 1675 1676 1677 1678 1679
{
	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);

1680
	if (!rgd->rd_dinodes)
D
David Teigland 已提交
1681
		gfs2_consist_rgrpd(rgd);
1682
	rgd->rd_dinodes--;
1683
	rgd->rd_free++;
D
David Teigland 已提交
1684

1685
	gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
1686
	gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
D
David Teigland 已提交
1687 1688 1689 1690 1691 1692 1693 1694

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


void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip)
{
1695
	gfs2_free_uninit_di(rgd, ip->i_no_addr);
S
Steven Whitehouse 已提交
1696
	trace_gfs2_block_alloc(ip, ip->i_no_addr, 1, GFS2_BLKST_FREE);
1697
	gfs2_quota_change(ip, -1, ip->i_inode.i_uid, ip->i_inode.i_gid);
1698
	gfs2_meta_wipe(ip, ip->i_no_addr, 1);
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David Teigland 已提交
1699 1700
}

1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715
/**
 * gfs2_check_blk_type - Check the type of a block
 * @sdp: The superblock
 * @no_addr: The block number to check
 * @type: The block type we are looking for
 *
 * Returns: 0 if the block type matches the expected type
 *          -ESTALE if it doesn't match
 *          or -ve errno if something went wrong while checking
 */

int gfs2_check_blk_type(struct gfs2_sbd *sdp, u64 no_addr, unsigned int type)
{
	struct gfs2_rgrpd *rgd;
	struct gfs2_holder ri_gh, rgd_gh;
1716 1717
	struct gfs2_inode *ip = GFS2_I(sdp->sd_rindex);
	int ri_locked = 0;
1718 1719
	int error;

1720 1721 1722 1723 1724 1725
	if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
		error = gfs2_rindex_hold(sdp, &ri_gh);
		if (error)
			goto fail;
		ri_locked = 1;
	}
1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740

	error = -EINVAL;
	rgd = gfs2_blk2rgrpd(sdp, no_addr);
	if (!rgd)
		goto fail_rindex;

	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh);
	if (error)
		goto fail_rindex;

	if (gfs2_get_block_type(rgd, no_addr) != type)
		error = -ESTALE;

	gfs2_glock_dq_uninit(&rgd_gh);
fail_rindex:
1741 1742
	if (ri_locked)
		gfs2_glock_dq_uninit(&ri_gh);
1743 1744 1745 1746
fail:
	return error;
}

D
David Teigland 已提交
1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759
/**
 * 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,
1760
		    u64 block)
D
David Teigland 已提交
1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772
{
	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))
1773
			fs_err(sdp, "block = %llu\n", (unsigned long long)block);
D
David Teigland 已提交
1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784
		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 *),
1785
			      GFP_NOFS | __GFP_NOFAIL);
D
David Teigland 已提交
1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810

		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
 *
 */

1811
void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist, unsigned int state)
D
David Teigland 已提交
1812 1813 1814 1815
{
	unsigned int x;

	rlist->rl_ghs = kcalloc(rlist->rl_rgrps, sizeof(struct gfs2_holder),
1816
				GFP_NOFS | __GFP_NOFAIL);
D
David Teigland 已提交
1817 1818
	for (x = 0; x < rlist->rl_rgrps; x++)
		gfs2_holder_init(rlist->rl_rgd[x]->rd_gl,
1819
				state, 0,
D
David Teigland 已提交
1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841
				&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);
	}
}