[karo-tx-linux.git] / fs / gfs2 / rgrp.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2008 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/prefetch.h>
#include <linux/blkdev.h>
#include <linux/rbtree.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 "util.h"
#include "log.h"
#include "inode.h"
#include "trace_gfs2.h"

#define BFITNOENT ((u32)~0)
#define NO_BLOCK ((u64)~0)

#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

/*
 * 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
};

static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
                        unsigned char old_state,
                        struct gfs2_bitmap **rbi);

/**
 * gfs2_setbit - Set a bit in the bitmaps
 * @rgd: the resource group descriptor
 * @buf2: the clone buffer that holds the bitmaps
 * @bi: the bitmap structure
 * @block: the block to set
 * @new_state: the new state of the block
 *
 */

static inline void gfs2_setbit(struct gfs2_rgrpd *rgd, unsigned char *buf2,
                               struct gfs2_bitmap *bi, u32 block,
                               unsigned char new_state)
{
        unsigned char *byte1, *byte2, *end, cur_state;
        unsigned int buflen = bi->bi_len;
        const unsigned int bit = (block % GFS2_NBBY) * GFS2_BIT_SIZE;

        byte1 = bi->bi_bh->b_data + bi->bi_offset + (block / GFS2_NBBY);
        end = bi->bi_bh->b_data + bi->bi_offset + buflen;

        BUG_ON(byte1 >= end);

        cur_state = (*byte1 >> bit) & GFS2_BIT_MASK;

        if (unlikely(!valid_change[new_state * 4 + cur_state])) {
                printk(KERN_WARNING "GFS2: buf_blk = 0x%llx old_state=%d, "
                       "new_state=%d\n",
                       (unsigned long long)block, cur_state, new_state);
                printk(KERN_WARNING "GFS2: rgrp=0x%llx bi_start=0x%lx\n",
                       (unsigned long long)rgd->rd_addr,
                       (unsigned long)bi->bi_start);
                printk(KERN_WARNING "GFS2: bi_offset=0x%lx bi_len=0x%lx\n",
                       (unsigned long)bi->bi_offset,
                       (unsigned long)bi->bi_len);
                dump_stack();
                gfs2_consist_rgrpd(rgd);
                return;
        }
        *byte1 ^= (cur_state ^ new_state) << bit;

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

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

static inline unsigned char gfs2_testbit(struct gfs2_rgrpd *rgd,
                                         const unsigned char *buffer,
                                         unsigned int buflen, u32 block)
{
        const unsigned char *byte, *end;
        unsigned char 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_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[] = {
                [0] = 0xffffffffffffffffULL,
                [1] = 0xaaaaaaaaaaaaaaaaULL,
                [2] = 0x5555555555555555ULL,
                [3] = 0x0000000000000000ULL,
        };
        tmp = le64_to_cpu(*ptr) ^ search[state];
        tmp &= (tmp >> 1);
        tmp &= mask;
        return tmp;
}

/**
 * gfs2_bitfit - Search an rgrp's bitmap buffer to find a bit-pair representing
 *       a block in a given allocation state.
 * @buf: the buffer that holds the bitmaps
 * @len: the length (in bytes) of the buffer
 * @goal: start search at this block's bit-pair (within @buffer)
 * @state: GFS2_BLKST_XXX the state of the block we're looking for.
 *
 * 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, 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
 * always ok to read a complete multiple of 64 bits at the end
 * of the block in case the end is no aligned to a natural boundary.
 *
 * Return: the block number (bitmap buffer scope) that was found
 */

static u32 gfs2_bitfit(const u8 *buf, const unsigned int len,
                       u32 goal, u8 state)
{
        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;
        u64 mask = 0x5555555555555555ULL;
        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) {
                tmp = gfs2_bit_search(ptr, 0x5555555555555555ULL, state);
                ptr++;
        }
        /* 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--;
        bit = __ffs64(tmp);
        bit /= 2;       /* two bits per entry in the bitmap */
        return (((const unsigned char *)ptr - buf) * GFS2_NBBY) + bit;
}

/**
 * gfs2_bitcount - count the number of bits in a certain state
 * @rgd: the resource group descriptor
 * @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, const u8 *buffer,
                         unsigned int buflen, u8 state)
{
        const u8 *byte = buffer;
        const u8 *end = buffer + buflen;
        const u8 state1 = state << 2;
        const u8 state2 = state << 4;
        const u8 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
 * @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_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_free) {
                if (gfs2_consist_rgrpd(rgd))
                        fs_err(sdp, "free data mismatch:  %u != %u\n",
                               count[0], rgd->rd_free);
                return;
        }

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

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

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

/**
 * gfs2_blk2rgrpd - Find resource group for a given data/meta block number
 * @sdp: The GFS2 superblock
 * @blk: The data block number
 * @exact: True if this needs to be an exact match
 *
 * Returns: The resource group, or NULL if not found
 */

struct gfs2_rgrpd *gfs2_blk2rgrpd(struct gfs2_sbd *sdp, u64 blk, bool exact)
{
        struct rb_node *n, *next;
        struct gfs2_rgrpd *cur;

        spin_lock(&sdp->sd_rindex_spin);
        n = sdp->sd_rindex_tree.rb_node;
        while (n) {
                cur = rb_entry(n, struct gfs2_rgrpd, rd_node);
                next = NULL;
                if (blk < cur->rd_addr)
                        next = n->rb_left;
                else if (blk >= cur->rd_data0 + cur->rd_data)
                        next = n->rb_right;
                if (next == NULL) {
                        spin_unlock(&sdp->sd_rindex_spin);
                        if (exact) {
                                if (blk < cur->rd_addr)
                                        return NULL;
                                if (blk >= cur->rd_data0 + cur->rd_data)
                                        return NULL;
                        }
                        return cur;
                }
                n = next;
        }
        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)
{
        const struct rb_node *n;
        struct gfs2_rgrpd *rgd;

        spin_lock(&sdp->sd_rindex_spin);
        n = rb_first(&sdp->sd_rindex_tree);
        rgd = rb_entry(n, struct gfs2_rgrpd, rd_node);
        spin_unlock(&sdp->sd_rindex_spin);

        return rgd;
}

/**
 * gfs2_rgrpd_get_next - get the next RG
 * @rgd: the resource group descriptor
 *
 * Returns: The next rgrp
 */

struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd)
{
        struct gfs2_sbd *sdp = rgd->rd_sbd;
        const struct rb_node *n;

        spin_lock(&sdp->sd_rindex_spin);
        n = rb_next(&rgd->rd_node);
        if (n == NULL)
                n = rb_first(&sdp->sd_rindex_tree);

        if (unlikely(&rgd->rd_node == n)) {
                spin_unlock(&sdp->sd_rindex_spin);
                return NULL;
        }
        rgd = rb_entry(n, struct gfs2_rgrpd, rd_node);
        spin_unlock(&sdp->sd_rindex_spin);
        return rgd;
}

void gfs2_free_clones(struct gfs2_rgrpd *rgd)
{
        int x;

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

/**
 * gfs2_rs_alloc - make sure we have a reservation assigned to the inode
 * @ip: the inode for this reservation
 */
int gfs2_rs_alloc(struct gfs2_inode *ip)
{
        int error = 0;

        down_write(&ip->i_rw_mutex);
        if (!ip->i_res) {
                ip->i_res = kmem_cache_zalloc(gfs2_rsrv_cachep, GFP_NOFS);
                if (!ip->i_res)
                        error = -ENOMEM;
        }
        up_write(&ip->i_rw_mutex);
        return error;
}

/**
 * gfs2_rs_delete - delete a reservation
 * @ip: The inode for this reservation
 *
 */
void gfs2_rs_delete(struct gfs2_inode *ip)
{
        down_write(&ip->i_rw_mutex);
        if (ip->i_res) {
                kmem_cache_free(gfs2_rsrv_cachep, ip->i_res);
                ip->i_res = NULL;
        }
        up_write(&ip->i_rw_mutex);
}

void gfs2_clear_rgrpd(struct gfs2_sbd *sdp)
{
        struct rb_node *n;
        struct gfs2_rgrpd *rgd;
        struct gfs2_glock *gl;

        while ((n = rb_first(&sdp->sd_rindex_tree))) {
                rgd = rb_entry(n, struct gfs2_rgrpd, rd_node);
                gl = rgd->rd_gl;

                rb_erase(n, &sdp->sd_rindex_tree);

                if (gl) {
                        spin_lock(&gl->gl_spin);
                        gl->gl_object = NULL;
                        spin_unlock(&gl->gl_spin);
                        gfs2_glock_add_to_lru(gl);
                        gfs2_glock_put(gl);
                }

                gfs2_free_clones(rgd);
                kfree(rgd->rd_bits);
                kmem_cache_free(gfs2_rgrpd_cachep, rgd);
        }
}

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);
}

/**
 * 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_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_bitbytes;

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

                bi->bi_flags = 0;
                /* 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_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_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_data) {
                if (gfs2_consist_rgrpd(rgd)) {
                        gfs2_rindex_print(rgd);
                        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_total - Total up the file system space, according to the rindex.
 * @sdp: the filesystem
 *
 */
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)];
        int error, rgrps;

        for (rgrps = 0;; rgrps++) {
                loff_t pos = rgrps * sizeof(struct gfs2_rindex);

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

static int rgd_insert(struct gfs2_rgrpd *rgd)
{
        struct gfs2_sbd *sdp = rgd->rd_sbd;
        struct rb_node **newn = &sdp->sd_rindex_tree.rb_node, *parent = NULL;

        /* Figure out where to put new node */
        while (*newn) {
                struct gfs2_rgrpd *cur = rb_entry(*newn, struct gfs2_rgrpd,
                                                  rd_node);

                parent = *newn;
                if (rgd->rd_addr < cur->rd_addr)
                        newn = &((*newn)->rb_left);
                else if (rgd->rd_addr > cur->rd_addr)
                        newn = &((*newn)->rb_right);
                else
                        return -EEXIST;
        }

        rb_link_node(&rgd->rd_node, parent, newn);
        rb_insert_color(&rgd->rd_node, &sdp->sd_rindex_tree);
        sdp->sd_rgrps++;
        return 0;
}

/**
 * read_rindex_entry - Pull in a new resource index entry from the disk
 * @ip: Pointer to the rindex inode
 *
 * Returns: 0 on success, > 0 on EOF, error code otherwise
 */

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

        if (pos >= i_size_read(&ip->i_inode))
                return 1;

        error = gfs2_internal_read(ip, (char *)&buf, &pos,
                                   sizeof(struct gfs2_rindex));

        if (error != sizeof(struct gfs2_rindex))
                return (error == 0) ? 1 : error;

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

        rgd->rd_sbd = sdp;
        rgd->rd_addr = be64_to_cpu(buf.ri_addr);
        rgd->rd_length = be32_to_cpu(buf.ri_length);
        rgd->rd_data0 = be64_to_cpu(buf.ri_data0);
        rgd->rd_data = be32_to_cpu(buf.ri_data);
        rgd->rd_bitbytes = be32_to_cpu(buf.ri_bitbytes);

        error = compute_bitstructs(rgd);
        if (error)
                goto fail;

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

        rgd->rd_gl->gl_object = rgd;
        rgd->rd_rgl = (struct gfs2_rgrp_lvb *)rgd->rd_gl->gl_lvb;
        rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
        if (rgd->rd_data > sdp->sd_max_rg_data)
                sdp->sd_max_rg_data = rgd->rd_data;
        spin_lock(&sdp->sd_rindex_spin);
        error = rgd_insert(rgd);
        spin_unlock(&sdp->sd_rindex_spin);
        if (!error)
                return 0;

        error = 0; /* someone else read in the rgrp; free it and ignore it */
        gfs2_glock_put(rgd->rd_gl);

fail:
        kfree(rgd->rd_bits);
        kmem_cache_free(gfs2_rgrpd_cachep, rgd);
        return error;
}

/**
 * gfs2_ri_update - Pull in a new resource index from the disk
 * @ip: pointer to 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);
        int error;

        do {
                error = read_rindex_entry(ip);
        } while (error == 0);

        if (error < 0)
                return error;

        sdp->sd_rindex_uptodate = 1;
        return 0;
}

/**
 * gfs2_rindex_update - Update the rindex if required
 * @sdp: The GFS2 superblock
 *
 * 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 succeess, error code otherwise
 */

int gfs2_rindex_update(struct gfs2_sbd *sdp)
{
        struct gfs2_inode *ip = GFS2_I(sdp->sd_rindex);
        struct gfs2_glock *gl = ip->i_gl;
        struct gfs2_holder ri_gh;
        int error = 0;
        int unlock_required = 0;

        /* Read new copy from disk if we don't have the latest */
        if (!sdp->sd_rindex_uptodate) {
                if (!gfs2_glock_is_locked_by_me(gl)) {
                        error = gfs2_glock_nq_init(gl, LM_ST_SHARED, 0, &ri_gh);
                        if (error)
                                return error;
                        unlock_required = 1;
                }
                if (!sdp->sd_rindex_uptodate)
                        error = gfs2_ri_update(ip);
                if (unlock_required)
                        gfs2_glock_dq_uninit(&ri_gh);
        }

        return error;
}

static void gfs2_rgrp_in(struct gfs2_rgrpd *rgd, const void *buf)
{
        const struct gfs2_rgrp *str = buf;
        u32 rg_flags;

        rg_flags = be32_to_cpu(str->rg_flags);
        rg_flags &= ~GFS2_RDF_MASK;
        rgd->rd_flags &= GFS2_RDF_MASK;
        rgd->rd_flags |= rg_flags;
        rgd->rd_free = be32_to_cpu(str->rg_free);
        rgd->rd_dinodes = be32_to_cpu(str->rg_dinodes);
        rgd->rd_igeneration = be64_to_cpu(str->rg_igeneration);
}

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

        str->rg_flags = cpu_to_be32(rgd->rd_flags & ~GFS2_RDF_MASK);
        str->rg_free = cpu_to_be32(rgd->rd_free);
        str->rg_dinodes = cpu_to_be32(rgd->rd_dinodes);
        str->__pad = cpu_to_be32(0);
        str->rg_igeneration = cpu_to_be64(rgd->rd_igeneration);
        memset(&str->rg_reserved, 0, sizeof(str->rg_reserved));
}

static int gfs2_rgrp_lvb_valid(struct gfs2_rgrpd *rgd)
{
        struct gfs2_rgrp_lvb *rgl = rgd->rd_rgl;
        struct gfs2_rgrp *str = (struct gfs2_rgrp *)rgd->rd_bits[0].bi_bh->b_data;

        if (rgl->rl_flags != str->rg_flags || rgl->rl_free != str->rg_free ||
            rgl->rl_dinodes != str->rg_dinodes ||
            rgl->rl_igeneration != str->rg_igeneration)
                return 0;
        return 1;
}

static void gfs2_rgrp_ondisk2lvb(struct gfs2_rgrp_lvb *rgl, const void *buf)
{
        const struct gfs2_rgrp *str = buf;

        rgl->rl_magic = cpu_to_be32(GFS2_MAGIC);
        rgl->rl_flags = str->rg_flags;
        rgl->rl_free = str->rg_free;
        rgl->rl_dinodes = str->rg_dinodes;
        rgl->rl_igeneration = str->rg_igeneration;
        rgl->__pad = 0UL;
}

static void update_rgrp_lvb_unlinked(struct gfs2_rgrpd *rgd, u32 change)
{
        struct gfs2_rgrp_lvb *rgl = rgd->rd_rgl;
        u32 unlinked = be32_to_cpu(rgl->rl_unlinked) + change;
        rgl->rl_unlinked = cpu_to_be32(unlinked);
}

static u32 count_unlinked(struct gfs2_rgrpd *rgd)
{
        struct gfs2_bitmap *bi;
        const u32 length = rgd->rd_length;
        const u8 *buffer = NULL;
        u32 i, goal, count = 0;

        for (i = 0, bi = rgd->rd_bits; i < length; i++, bi++) {
                goal = 0;
                buffer = bi->bi_bh->b_data + bi->bi_offset;
                WARN_ON(!buffer_uptodate(bi->bi_bh));
                while (goal < bi->bi_len * GFS2_NBBY) {
                        goal = gfs2_bitfit(buffer, bi->bi_len, goal,
                                           GFS2_BLKST_UNLINKED);
                        if (goal == BFITNOENT)
                                break;
                        count++;
                        goal++;
                }
        }

        return count;
}


/**
 * 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_length;
        struct gfs2_bitmap *bi;
        unsigned int x, y;
        int error;

        if (rgd->rd_bits[0].bi_bh != NULL)
                return 0;

        for (x = 0; x < length; x++) {
                bi = rgd->rd_bits + x;
                error = gfs2_meta_read(gl, rgd->rd_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_flags & GFS2_RDF_UPTODATE)) {
                for (x = 0; x < length; x++)
                        clear_bit(GBF_FULL, &rgd->rd_bits[x].bi_flags);
                gfs2_rgrp_in(rgd, (rgd->rd_bits[0].bi_bh)->b_data);
                rgd->rd_flags |= (GFS2_RDF_UPTODATE | GFS2_RDF_CHECK);
                rgd->rd_free_clone = rgd->rd_free;
        }
        if (be32_to_cpu(GFS2_MAGIC) != rgd->rd_rgl->rl_magic) {
                rgd->rd_rgl->rl_unlinked = cpu_to_be32(count_unlinked(rgd));
                gfs2_rgrp_ondisk2lvb(rgd->rd_rgl,
                                     rgd->rd_bits[0].bi_bh->b_data);
        }
        else if (sdp->sd_args.ar_rgrplvb) {
                if (!gfs2_rgrp_lvb_valid(rgd)){
                        gfs2_consist_rgrpd(rgd);
                        error = -EIO;
                        goto fail;
                }
                if (rgd->rd_rgl->rl_unlinked == 0)
                        rgd->rd_flags &= ~GFS2_RDF_CHECK;
        }
        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);
        }

        return error;
}

int update_rgrp_lvb(struct gfs2_rgrpd *rgd)
{
        u32 rl_flags;

        if (rgd->rd_flags & GFS2_RDF_UPTODATE)
                return 0;

        if (be32_to_cpu(GFS2_MAGIC) != rgd->rd_rgl->rl_magic)
                return gfs2_rgrp_bh_get(rgd);

        rl_flags = be32_to_cpu(rgd->rd_rgl->rl_flags);
        rl_flags &= ~GFS2_RDF_MASK;
        rgd->rd_flags &= GFS2_RDF_MASK;
        rgd->rd_flags |= (rl_flags | GFS2_RDF_UPTODATE | GFS2_RDF_CHECK);
        if (rgd->rd_rgl->rl_unlinked == 0)
                rgd->rd_flags &= ~GFS2_RDF_CHECK;
        rgd->rd_free = be32_to_cpu(rgd->rd_rgl->rl_free);
        rgd->rd_free_clone = rgd->rd_free;
        rgd->rd_dinodes = be32_to_cpu(rgd->rd_rgl->rl_dinodes);
        rgd->rd_igeneration = be64_to_cpu(rgd->rd_rgl->rl_igeneration);
        return 0;
}

int gfs2_rgrp_go_lock(struct gfs2_holder *gh)
{
        struct gfs2_rgrpd *rgd = gh->gh_gl->gl_object;
        struct gfs2_sbd *sdp = rgd->rd_sbd;

        if (gh->gh_flags & GL_SKIP && sdp->sd_args.ar_rgrplvb)
                return 0;
        return gfs2_rgrp_bh_get((struct gfs2_rgrpd *)gh->gh_gl->gl_object);
}

/**
 * gfs2_rgrp_go_unlock - Release RG bitmaps read in with gfs2_rgrp_bh_get()
 * @gh: The glock holder for the resource group
 *
 */

void gfs2_rgrp_go_unlock(struct gfs2_holder *gh)
{
        struct gfs2_rgrpd *rgd = gh->gh_gl->gl_object;
        int x, length = rgd->rd_length;

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

}

int gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
                             struct buffer_head *bh,
                             const struct gfs2_bitmap *bi, unsigned minlen, u64 *ptrimmed)
{
        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 /
                                           bdev_logical_block_size(sb->s_bdev);
        u64 blk;
        sector_t start = 0;
        sector_t nr_sects = 0;
        int rv;
        unsigned int x;
        u32 trimmed = 0;
        u8 diff;

        for (x = 0; x < bi->bi_len; x++) {
                const u8 *clone = bi->bi_clone ? bi->bi_clone : bi->bi_bh->b_data;
                clone += bi->bi_offset;
                clone += x;
                if (bh) {
                        const u8 *orig = bh->b_data + bi->bi_offset + x;
                        diff = ~(*orig | (*orig >> 1)) & (*clone | (*clone >> 1));
                } else {
                        diff = ~(*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) {
                                        if (nr_sects >= minlen) {
                                                rv = blkdev_issue_discard(bdev,
                                                        start, nr_sects,
                                                        GFP_NOFS, 0);
                                                if (rv)
                                                        goto fail;
                                                trimmed += nr_sects;
                                        }
                                        nr_sects = 0;
start_new_extent:
                                        start = blk;
                                }
                                nr_sects += sects_per_blk;
                        }
                        diff >>= 2;
                        blk += sects_per_blk;
                }
        }
        if (nr_sects >= minlen) {
                rv = blkdev_issue_discard(bdev, start, nr_sects, GFP_NOFS, 0);
                if (rv)
                        goto fail;
                trimmed += nr_sects;
        }
        if (ptrimmed)
                *ptrimmed = trimmed;
        return 0;

fail:
        if (sdp->sd_args.ar_discard)
                fs_warn(sdp, "error %d on discard request, turning discards off for this filesystem", rv);
        sdp->sd_args.ar_discard = 0;
        return -EIO;
}

/**
 * gfs2_fitrim - Generate discard requests for unused bits of the filesystem
 * @filp: Any file on the filesystem
 * @argp: Pointer to the arguments (also used to pass result)
 *
 * Returns: 0 on success, otherwise error code
 */

int gfs2_fitrim(struct file *filp, void __user *argp)
{
        struct inode *inode = filp->f_dentry->d_inode;
        struct gfs2_sbd *sdp = GFS2_SB(inode);
        struct request_queue *q = bdev_get_queue(sdp->sd_vfs->s_bdev);
        struct buffer_head *bh;
        struct gfs2_rgrpd *rgd;
        struct gfs2_rgrpd *rgd_end;
        struct gfs2_holder gh;
        struct fstrim_range r;
        int ret = 0;
        u64 amt;
        u64 trimmed = 0;
        unsigned int x;

        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;

        if (!blk_queue_discard(q))
                return -EOPNOTSUPP;

        if (argp == NULL) {
                r.start = 0;
                r.len = ULLONG_MAX;
                r.minlen = 0;
        } else if (copy_from_user(&r, argp, sizeof(r)))
                return -EFAULT;

        ret = gfs2_rindex_update(sdp);
        if (ret)
                return ret;

        rgd = gfs2_blk2rgrpd(sdp, r.start, 0);
        rgd_end = gfs2_blk2rgrpd(sdp, r.start + r.len, 0);

        while (1) {

                ret = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
                if (ret)
                        goto out;

                if (!(rgd->rd_flags & GFS2_RGF_TRIMMED)) {
                        /* Trim each bitmap in the rgrp */
                        for (x = 0; x < rgd->rd_length; x++) {
                                struct gfs2_bitmap *bi = rgd->rd_bits + x;
                                ret = gfs2_rgrp_send_discards(sdp, rgd->rd_data0, NULL, bi, r.minlen, &amt);
                                if (ret) {
                                        gfs2_glock_dq_uninit(&gh);
                                        goto out;
                                }
                                trimmed += amt;
                        }

                        /* Mark rgrp as having been trimmed */
                        ret = gfs2_trans_begin(sdp, RES_RG_HDR, 0);
                        if (ret == 0) {
                                bh = rgd->rd_bits[0].bi_bh;
                                rgd->rd_flags |= GFS2_RGF_TRIMMED;
                                gfs2_trans_add_bh(rgd->rd_gl, bh, 1);
                                gfs2_rgrp_out(rgd, bh->b_data);
                                gfs2_rgrp_ondisk2lvb(rgd->rd_rgl, bh->b_data);
                                gfs2_trans_end(sdp);
                        }
                }
                gfs2_glock_dq_uninit(&gh);

                if (rgd == rgd_end)
                        break;

                rgd = gfs2_rgrpd_get_next(rgd);
        }

out:
        r.len = trimmed << 9;
        if (argp && copy_to_user(argp, &r, sizeof(r)))
                return -EFAULT;

        return ret;
}

/**
 * try_rgrp_fit - See if a given reservation will fit in a given RG
 * @rgd: the RG data
 * @ip: the inode
 *
 * If there's room for the requested blocks to be allocated from the RG:
 *
 * Returns: 1 on success (it fits), 0 on failure (it doesn't fit)
 */

static int try_rgrp_fit(const struct gfs2_rgrpd *rgd, const struct gfs2_inode *ip)
{
        const struct gfs2_blkreserv *rs = ip->i_res;

        if (rgd->rd_flags & (GFS2_RGF_NOALLOC | GFS2_RDF_ERROR))
                return 0;
        if (rgd->rd_free_clone >= rs->rs_requested)
                return 1;
        return 0;
}

static inline u32 gfs2_bi2rgd_blk(struct gfs2_bitmap *bi, u32 blk)
{
        return (bi->bi_start * GFS2_NBBY) + blk;
}

/**
 * try_rgrp_unlink - Look for any unlinked, allocated, but unused inodes
 * @rgd: The rgrp
 * @last_unlinked: block address of the last dinode we unlinked
 * @skip: block address we should explicitly not unlink
 *
 * Returns: 0 if no error
 *          The inode, if one has been found, in inode.
 */

static void try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked, u64 skip)
{
        u32 goal = 0, block;
        u64 no_addr;
        struct gfs2_sbd *sdp = rgd->rd_sbd;
        struct gfs2_glock *gl;
        struct gfs2_inode *ip;
        int error;
        int found = 0;
        struct gfs2_bitmap *bi;

        while (goal < rgd->rd_data) {
                down_write(&sdp->sd_log_flush_lock);
                block = rgblk_search(rgd, goal, GFS2_BLKST_UNLINKED, &bi);
                up_write(&sdp->sd_log_flush_lock);
                if (block == BFITNOENT)
                        break;

                block = gfs2_bi2rgd_blk(bi, block);
                /* rgblk_search can return a block < goal, so we need to
                   keep it marching forward. */
                no_addr = block + rgd->rd_data0;
                goal = max(block + 1, goal + 1);
                if (*last_unlinked != NO_BLOCK && no_addr <= *last_unlinked)
                        continue;
                if (no_addr == skip)
                        continue;
                *last_unlinked = no_addr;

                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 > NR_CPUS)
                        return;
        }

        rgd->rd_flags &= ~GFS2_RDF_CHECK;
        return;
}

/**
 * gfs2_inplace_reserve - Reserve space in the filesystem
 * @ip: the inode to reserve space for
 * @requested: the number of blocks to be reserved
 *
 * Returns: errno
 */

int gfs2_inplace_reserve(struct gfs2_inode *ip, u32 requested)
{
        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
        struct gfs2_rgrpd *rgd, *begin = NULL;
        struct gfs2_blkreserv *rs = ip->i_res;
        int error = 0, rg_locked, flags = LM_FLAG_TRY;
        u64 last_unlinked = NO_BLOCK;
        int loops = 0;

        if (sdp->sd_args.ar_rgrplvb)
                flags |= GL_SKIP;
        rs = ip->i_res;
        rs->rs_requested = requested;
        if (gfs2_assert_warn(sdp, requested)) {
                error = -EINVAL;
                goto out;
        }

        if (ip->i_rgd && rgrp_contains_block(ip->i_rgd, ip->i_goal))
                rgd = begin = ip->i_rgd;
        else
                rgd = begin = gfs2_blk2rgrpd(sdp, ip->i_goal, 1);

        if (rgd == NULL)
                return -EBADSLT;

        while (loops < 3) {
                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, &rs->rs_rgd_gh);
                        if (!error && sdp->sd_args.ar_rgrplvb) {
                                error = update_rgrp_lvb(rgd);
                                if (error) {
                                        gfs2_glock_dq_uninit(&rs->rs_rgd_gh);
                                        return error;
                                }
                        }
                }
                switch (error) {
                case 0:
                        if (try_rgrp_fit(rgd, ip)) {
                                if (sdp->sd_args.ar_rgrplvb)
                                        gfs2_rgrp_bh_get(rgd);
                                ip->i_rgd = rgd;
                                return 0;
                        }
                        if (rgd->rd_flags & GFS2_RDF_CHECK) {
                                if (sdp->sd_args.ar_rgrplvb)
                                        gfs2_rgrp_bh_get(rgd);
                                try_rgrp_unlink(rgd, &last_unlinked,
                                                ip->i_no_addr);
                        }
                        if (!rg_locked)
                                gfs2_glock_dq_uninit(&rs->rs_rgd_gh);
                        /* fall through */
                case GLR_TRYFAILED:
                        rgd = gfs2_rgrpd_get_next(rgd);
                        rgd = rgd ? : begin; /* if NULL, wrap */
                        if (rgd != begin) /* If we didn't wrap */
                                break;

                        flags &= ~LM_FLAG_TRY;
                        loops++;
                        /* Check that fs hasn't grown if writing to rindex */
                        if (ip == GFS2_I(sdp->sd_rindex) &&
                            !sdp->sd_rindex_uptodate) {
                                error = gfs2_ri_update(ip);
                                if (error)
                                        goto out;
                        } else if (loops == 2)
                                /* Flushing the log may release space */
                                gfs2_log_flush(sdp, NULL);
                        break;
                default:
                        goto out;
                }
        }
        error = -ENOSPC;

out:
        if (error)
                rs->rs_requested = 0;
        return error;
}

/**
 * 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_blkreserv *rs = ip->i_res;

        if (rs->rs_rgd_gh.gh_gl)
                gfs2_glock_dq_uninit(&rs->rs_rgd_gh);
        rs->rs_requested = 0;
}

/**
 * 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_*)
 */

static 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_length;
        rgrp_block = block - rgd->rd_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 @state
 * @rgd: the resource group descriptor
 * @goal: the goal block within the RG (start here to search for avail block)
 * @state: GFS2_BLKST_XXX the before-allocation state to find
 * @rbi: address of the pointer to the bitmap containing the block found
 *
 * Walk rgrp's bitmap to find bits that represent a block in @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 is just within rgrp, not the whole filesystem.
 * Scope of @returned block is just within bitmap, not the whole filesystem.
 *
 * Returns: the block number found relative to the bitmap rbi
 */

static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal, unsigned char state,
                        struct gfs2_bitmap **rbi)
{
        struct gfs2_bitmap *bi = NULL;
        const u32 length = rgd->rd_length;
        u32 biblk = BFITNOENT;
        unsigned int buf, x;
        const u8 *buffer = NULL;

        *rbi = NULL;
        /* Find bitmap block that contains bits for goal block */
        for (buf = 0; buf < length; buf++) {
                bi = rgd->rd_bits + buf;
                /* 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;
                }
        }
        buf = 0;
        goal = 0;

do_search:
        /* 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++) {
                bi = rgd->rd_bits + buf;

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

                /* The GFS2_BLKST_UNLINKED state doesn't apply to the clone
                   bitmaps, so we must search the originals for that. */
                buffer = bi->bi_bh->b_data + bi->bi_offset;
                WARN_ON(!buffer_uptodate(bi->bi_bh));
                if (state != GFS2_BLKST_UNLINKED && bi->bi_clone)
                        buffer = bi->bi_clone + bi->bi_offset;

                biblk = gfs2_bitfit(buffer, bi->bi_len, goal, state);
                if (biblk != BFITNOENT)
                        break;

                if ((goal == 0) && (state == GFS2_BLKST_FREE))
                        set_bit(GBF_FULL, &bi->bi_flags);

                /* Try next bitmap block (wrap back to rgrp header if at end) */
skip:
                buf++;
                buf %= length;
                goal = 0;
        }

        if (biblk != BFITNOENT)
                *rbi = bi;

        return biblk;
}

/**
 * gfs2_alloc_extent - allocate an extent from a given bitmap
 * @rgd: the resource group descriptor
 * @bi: the bitmap within the rgrp
 * @blk: the block within the bitmap
 * @dinode: TRUE if the first block we allocate is for a dinode
 * @n: The extent length
 *
 * Add the found bitmap buffer to the transaction.
 * Set the found bits to @new_state to change block's allocation state.
 * Returns: starting block number of the extent (fs scope)
 */
static u64 gfs2_alloc_extent(struct gfs2_rgrpd *rgd, struct gfs2_bitmap *bi,
                             u32 blk, bool dinode, unsigned int *n)
{
        const unsigned int elen = *n;
        u32 goal;
        const u8 *buffer = NULL;

        *n = 0;
        buffer = bi->bi_bh->b_data + bi->bi_offset;
        gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
        gfs2_setbit(rgd, bi->bi_clone, bi, blk,
                    dinode ? GFS2_BLKST_DINODE : GFS2_BLKST_USED);
        (*n)++;
        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;
                gfs2_setbit(rgd, bi->bi_clone, bi, goal, GFS2_BLKST_USED);
                (*n)++;
        }
        blk = gfs2_bi2rgd_blk(bi, blk);
        rgd->rd_last_alloc = blk + *n - 1;
        return rgd->rd_data0 + 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, 1);
        if (!rgd) {
                if (gfs2_consist(sdp))
                        fs_err(sdp, "block = %llu\n", (unsigned long long)bstart);
                return NULL;
        }

        length = rgd->rd_length;

        rgrp_blk = bstart - rgd->rd_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, NULL, bi, buf_blk, new_state);
        }

        return rgd;
}

/**
 * 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;
}

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",
                (unsigned long long)rgd->rd_addr);
        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;
}

/**
 * gfs2_alloc_blocks - Allocate one or more blocks of data and/or a dinode
 * @ip: the inode to allocate the block for
 * @bn: Used to return the starting block number
 * @ndata: requested number of blocks/extent length (value/result)
 * @dinode: 1 if we're allocating a dinode block, else 0
 * @generation: the generation number of the inode
 *
 * Returns: 0 or error
 */

int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *nblocks,
                      bool dinode, u64 *generation)
{
        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
        struct buffer_head *dibh;
        struct gfs2_rgrpd *rgd;
        unsigned int ndata;
        u32 goal, blk; /* block, within the rgrp scope */
        u64 block; /* block, within the file system scope */
        int error;
        struct gfs2_bitmap *bi;

        /* Only happens if there is a bug in gfs2, return something distinctive
         * to ensure that it is noticed.
         */
        if (ip->i_res->rs_requested == 0)
                return -ECANCELED;

        rgd = ip->i_rgd;

        if (!dinode && rgrp_contains_block(rgd, ip->i_goal))
                goal = ip->i_goal - rgd->rd_data0;
        else
                goal = rgd->rd_last_alloc;

        blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, &bi);

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

        block = gfs2_alloc_extent(rgd, bi, blk, dinode, nblocks);
        ndata = *nblocks;
        if (dinode)
                ndata--;

        if (!dinode) {
                ip->i_goal = block + ndata - 1;
                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);
                }
        }
        if (rgd->rd_free < *nblocks)
                goto rgrp_error;

        rgd->rd_free -= *nblocks;
        if (dinode) {
                rgd->rd_dinodes++;
                *generation = rgd->rd_igeneration++;
                if (*generation == 0)
                        *generation = rgd->rd_igeneration++;
        }

        gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
        gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
        gfs2_rgrp_ondisk2lvb(rgd->rd_rgl, rgd->rd_bits[0].bi_bh->b_data);

        gfs2_statfs_change(sdp, 0, -(s64)*nblocks, dinode ? 1 : 0);
        if (dinode)
                gfs2_trans_add_unrevoke(sdp, block, 1);

        /*
         * This needs reviewing to see why we cannot do the quota change
         * at this point in the dinode case.
         */
        if (ndata)
                gfs2_quota_change(ip, ndata, ip->i_inode.i_uid,
                                  ip->i_inode.i_gid);

        rgd->rd_free_clone -= *nblocks;
        trace_gfs2_block_alloc(ip, rgd, block, *nblocks,
                               dinode ? GFS2_BLKST_DINODE : GFS2_BLKST_USED);
        *bn = block;
        return 0;

rgrp_error:
        gfs2_rgrp_error(rgd);
        return -EIO;
}

/**
 * __gfs2_free_blocks - free a contiguous run of 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
 * @meta: 1 if the blocks represent metadata
 *
 */

void __gfs2_free_blocks(struct gfs2_inode *ip, u64 bstart, u32 blen, int meta)
{
        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;
        trace_gfs2_block_alloc(ip, rgd, bstart, blen, GFS2_BLKST_FREE);
        rgd->rd_free += blen;
        rgd->rd_flags &= ~GFS2_RGF_TRIMMED;
        gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
        gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
        gfs2_rgrp_ondisk2lvb(rgd->rd_rgl, rgd->rd_bits[0].bi_bh->b_data);

        /* Directories keep their data in the metadata address space */
        if (meta || ip->i_depth)
                gfs2_meta_wipe(ip, bstart, blen);
}

/**
 * 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);

        __gfs2_free_blocks(ip, bstart, blen, 1);
        gfs2_statfs_change(sdp, 0, +blen, 0);
        gfs2_quota_change(ip, -(s64)blen, ip->i_inode.i_uid, ip->i_inode.i_gid);
}

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_no_addr;

        rgd = rgblk_free(sdp, blkno, 1, GFS2_BLKST_UNLINKED);
        if (!rgd)
                return;
        trace_gfs2_block_alloc(ip, rgd, blkno, 1, GFS2_BLKST_UNLINKED);
        gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
        gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
        gfs2_rgrp_ondisk2lvb(rgd->rd_rgl, rgd->rd_bits[0].bi_bh->b_data);
        update_rgrp_lvb_unlinked(rgd, 1);
}

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_dinodes)
                gfs2_consist_rgrpd(rgd);
        rgd->rd_dinodes--;
        rgd->rd_free++;

        gfs2_trans_add_bh(rgd->rd_gl, rgd->rd_bits[0].bi_bh, 1);
        gfs2_rgrp_out(rgd, rgd->rd_bits[0].bi_bh->b_data);
        gfs2_rgrp_ondisk2lvb(rgd->rd_rgl, rgd->rd_bits[0].bi_bh->b_data);
        update_rgrp_lvb_unlinked(rgd, -1);

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


void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip)
{
        gfs2_free_uninit_di(rgd, ip->i_no_addr);
        trace_gfs2_block_alloc(ip, rgd, ip->i_no_addr, 1, GFS2_BLKST_FREE);
        gfs2_quota_change(ip, -1, ip->i_inode.i_uid, ip->i_inode.i_gid);
        gfs2_meta_wipe(ip, ip->i_no_addr, 1);
}

/**
 * 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 rgd_gh;
        int error = -EINVAL;

        rgd = gfs2_blk2rgrpd(sdp, no_addr, 1);
        if (!rgd)
                goto fail;

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

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

        gfs2_glock_dq_uninit(&rgd_gh);
fail:
        return error;
}

/**
 * gfs2_rlist_add - add a RG to a list of RGs
 * @ip: the inode
 * @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_inode *ip, struct gfs2_rgrp_list *rlist,
                    u64 block)
{
        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
        struct gfs2_rgrpd *rgd;
        struct gfs2_rgrpd **tmp;
        unsigned int new_space;
        unsigned int x;

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

        if (ip->i_rgd && rgrp_contains_block(ip->i_rgd, block))
                rgd = ip->i_rgd;
        else
                rgd = gfs2_blk2rgrpd(sdp, block, 1);
        if (!rgd) {
                fs_err(sdp, "rlist_add: no rgrp for block %llu\n", (unsigned long long)block);
                return;
        }
        ip->i_rgd = rgd;

        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
 *
 * FIXME: Don't use NOFAIL
 *
 */

void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist, unsigned int state)
{
        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, 0,
                                &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);
        }
}