#define BFITNOENT ((u32)~0)
#define NO_BLOCK ((u64)~0)
+#define RSRV_CONTENTION_FACTOR 4
+#define RGRP_RSRV_MAX_CONTENDERS 2
+
#if BITS_PER_LONG == 32
#define LBITMASK (0x55555555UL)
#define LBITSKIP55 (0x55555555UL)
return tmp;
}
+/**
+ * rs_cmp - multi-block reservation range compare
+ * @blk: absolute file system block number of the new reservation
+ * @len: number of blocks in the new reservation
+ * @rs: existing reservation to compare against
+ *
+ * returns: 1 if the block range is beyond the reach of the reservation
+ * -1 if the block range is before the start of the reservation
+ * 0 if the block range overlaps with the reservation
+ */
+static inline int rs_cmp(u64 blk, u32 len, struct gfs2_blkreserv *rs)
+{
+ u64 startblk = gfs2_rs_startblk(rs);
+
+ if (blk >= startblk + rs->rs_free)
+ return 1;
+ if (blk + len - 1 < startblk)
+ return -1;
+ return 0;
+}
+
+/**
+ * rs_find - Find a rgrp multi-block reservation that contains a given block
+ * @rgd: The rgrp
+ * @rgblk: The block we're looking for, relative to the rgrp
+ */
+static struct gfs2_blkreserv *rs_find(struct gfs2_rgrpd *rgd, u32 rgblk)
+{
+ struct rb_node **newn;
+ int rc;
+ u64 fsblk = rgblk + rgd->rd_data0;
+
+ spin_lock(&rgd->rd_rsspin);
+ newn = &rgd->rd_rstree.rb_node;
+ while (*newn) {
+ struct gfs2_blkreserv *cur =
+ rb_entry(*newn, struct gfs2_blkreserv, rs_node);
+ rc = rs_cmp(fsblk, 1, cur);
+ if (rc < 0)
+ newn = &((*newn)->rb_left);
+ else if (rc > 0)
+ newn = &((*newn)->rb_right);
+ else {
+ spin_unlock(&rgd->rd_rsspin);
+ return cur;
+ }
+ }
+ spin_unlock(&rgd->rd_rsspin);
+ return NULL;
+}
+
/**
* gfs2_bitfit - Search an rgrp's bitmap buffer to find a bit-pair representing
* a block in a given allocation state.
int gfs2_rs_alloc(struct gfs2_inode *ip)
{
int error = 0;
+ struct gfs2_blkreserv *res;
+
+ if (ip->i_res)
+ return 0;
+
+ res = kmem_cache_zalloc(gfs2_rsrv_cachep, GFP_NOFS);
+ if (!res)
+ error = -ENOMEM;
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;
- }
+ if (ip->i_res)
+ kmem_cache_free(gfs2_rsrv_cachep, res);
+ else
+ ip->i_res = res;
up_write(&ip->i_rw_mutex);
return error;
}
+static void dump_rs(struct seq_file *seq, struct gfs2_blkreserv *rs)
+{
+ gfs2_print_dbg(seq, " r: %llu s:%llu b:%u f:%u\n",
+ rs->rs_rgd->rd_addr, gfs2_rs_startblk(rs), rs->rs_biblk,
+ rs->rs_free);
+}
+
/**
- * gfs2_rs_delete - delete a reservation
+ * __rs_deltree - remove a multi-block reservation from the rgd tree
+ * @rs: The reservation to remove
+ *
+ */
+static void __rs_deltree(struct gfs2_blkreserv *rs)
+{
+ struct gfs2_rgrpd *rgd;
+
+ if (!gfs2_rs_active(rs))
+ return;
+
+ rgd = rs->rs_rgd;
+ /* We can't do this: The reason is that when the rgrp is invalidated,
+ it's in the "middle" of acquiring the glock, but the HOLDER bit
+ isn't set yet:
+ BUG_ON(!gfs2_glock_is_locked_by_me(rs->rs_rgd->rd_gl));*/
+ trace_gfs2_rs(NULL, rs, TRACE_RS_TREEDEL);
+
+ if (!RB_EMPTY_ROOT(&rgd->rd_rstree))
+ rb_erase(&rs->rs_node, &rgd->rd_rstree);
+ BUG_ON(!rgd->rd_rs_cnt);
+ rgd->rd_rs_cnt--;
+
+ if (rs->rs_free) {
+ /* return reserved blocks to the rgrp and the ip */
+ BUG_ON(rs->rs_rgd->rd_reserved < rs->rs_free);
+ rs->rs_rgd->rd_reserved -= rs->rs_free;
+ rs->rs_free = 0;
+ clear_bit(GBF_FULL, &rs->rs_bi->bi_flags);
+ smp_mb__after_clear_bit();
+ }
+ /* We can't change any of the step 1 or step 2 components of the rs.
+ E.g. We can't set rs_rgd to NULL because the rgd glock is held and
+ dequeued through this pointer.
+ Can't: atomic_set(&rs->rs_sizehint, 0);
+ Can't: rs->rs_requested = 0;
+ Can't: rs->rs_rgd = NULL;*/
+ rs->rs_bi = NULL;
+ rs->rs_biblk = 0;
+}
+
+/**
+ * gfs2_rs_deltree - remove a multi-block reservation from the rgd tree
+ * @rs: The reservation to remove
+ *
+ */
+void gfs2_rs_deltree(struct gfs2_blkreserv *rs)
+{
+ struct gfs2_rgrpd *rgd;
+
+ if (!gfs2_rs_active(rs))
+ return;
+
+ rgd = rs->rs_rgd;
+ spin_lock(&rgd->rd_rsspin);
+ __rs_deltree(rs);
+ spin_unlock(&rgd->rd_rsspin);
+}
+
+/**
+ * gfs2_rs_delete - delete a multi-block reservation
* @ip: The inode for this reservation
*
*/
{
down_write(&ip->i_rw_mutex);
if (ip->i_res) {
+ gfs2_rs_deltree(ip->i_res);
+ trace_gfs2_rs(ip, ip->i_res, TRACE_RS_DELETE);
+ BUG_ON(ip->i_res->rs_free);
kmem_cache_free(gfs2_rsrv_cachep, ip->i_res);
ip->i_res = NULL;
}
up_write(&ip->i_rw_mutex);
}
+/**
+ * return_all_reservations - return all reserved blocks back to the rgrp.
+ * @rgd: the rgrp that needs its space back
+ *
+ * We previously reserved a bunch of blocks for allocation. Now we need to
+ * give them back. This leave the reservation structures in tact, but removes
+ * all of their corresponding "no-fly zones".
+ */
+static void return_all_reservations(struct gfs2_rgrpd *rgd)
+{
+ struct rb_node *n;
+ struct gfs2_blkreserv *rs;
+
+ spin_lock(&rgd->rd_rsspin);
+ while ((n = rb_first(&rgd->rd_rstree))) {
+ rs = rb_entry(n, struct gfs2_blkreserv, rs_node);
+ __rs_deltree(rs);
+ }
+ spin_unlock(&rgd->rd_rsspin);
+}
+
void gfs2_clear_rgrpd(struct gfs2_sbd *sdp)
{
struct rb_node *n;
gfs2_free_clones(rgd);
kfree(rgd->rd_bits);
+ return_all_reservations(rgd);
kmem_cache_free(gfs2_rgrpd_cachep, rgd);
}
}
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);
+ spin_lock_init(&rgd->rd_rsspin);
error = compute_bitstructs(rgd);
if (error)
return ret;
}
+/**
+ * rs_insert - insert a new multi-block reservation into the rgrp's rb_tree
+ * @bi: the bitmap with the blocks
+ * @ip: the inode structure
+ * @biblk: the 32-bit block number relative to the start of the bitmap
+ * @amount: the number of blocks to reserve
+ *
+ * Returns: NULL - reservation was already taken, so not inserted
+ * pointer to the inserted reservation
+ */
+static struct gfs2_blkreserv *rs_insert(struct gfs2_bitmap *bi,
+ struct gfs2_inode *ip, u32 biblk,
+ int amount)
+{
+ struct rb_node **newn, *parent = NULL;
+ int rc;
+ struct gfs2_blkreserv *rs = ip->i_res;
+ struct gfs2_rgrpd *rgd = rs->rs_rgd;
+ u64 fsblock = gfs2_bi2rgd_blk(bi, biblk) + rgd->rd_data0;
+
+ spin_lock(&rgd->rd_rsspin);
+ newn = &rgd->rd_rstree.rb_node;
+ BUG_ON(!ip->i_res);
+ BUG_ON(gfs2_rs_active(rs));
+ /* Figure out where to put new node */
+ /*BUG_ON(!gfs2_glock_is_locked_by_me(rgd->rd_gl));*/
+ while (*newn) {
+ struct gfs2_blkreserv *cur =
+ rb_entry(*newn, struct gfs2_blkreserv, rs_node);
+
+ parent = *newn;
+ rc = rs_cmp(fsblock, amount, cur);
+ if (rc > 0)
+ newn = &((*newn)->rb_right);
+ else if (rc < 0)
+ newn = &((*newn)->rb_left);
+ else {
+ spin_unlock(&rgd->rd_rsspin);
+ return NULL; /* reservation already in use */
+ }
+ }
+
+ /* Do our reservation work */
+ rs = ip->i_res;
+ rs->rs_free = amount;
+ rs->rs_biblk = biblk;
+ rs->rs_bi = bi;
+ rb_link_node(&rs->rs_node, parent, newn);
+ rb_insert_color(&rs->rs_node, &rgd->rd_rstree);
+
+ /* Do our inode accounting for the reservation */
+ /*BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));*/
+
+ /* Do our rgrp accounting for the reservation */
+ rgd->rd_reserved += amount; /* blocks reserved */
+ rgd->rd_rs_cnt++; /* number of in-tree reservations */
+ spin_unlock(&rgd->rd_rsspin);
+ trace_gfs2_rs(ip, rs, TRACE_RS_INSERT);
+ return rs;
+}
+
+/**
+ * unclaimed_blocks - return number of blocks that aren't spoken for
+ */
+static u32 unclaimed_blocks(struct gfs2_rgrpd *rgd)
+{
+ return rgd->rd_free_clone - rgd->rd_reserved;
+}
+
+/**
+ * rg_mblk_search - find a group of multiple free blocks
+ * @rgd: the resource group descriptor
+ * @rs: the block reservation
+ * @ip: pointer to the inode for which we're reserving blocks
+ *
+ * This is very similar to rgblk_search, except we're looking for whole
+ * 64-bit words that represent a chunk of 32 free blocks. I'm only focusing
+ * on aligned dwords for speed's sake.
+ *
+ * Returns: 0 if successful or BFITNOENT if there isn't enough free space
+ */
+
+static int rg_mblk_search(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip)
+{
+ struct gfs2_bitmap *bi = rgd->rd_bits;
+ const u32 length = rgd->rd_length;
+ u32 blk;
+ unsigned int buf, x, search_bytes;
+ u8 *buffer = NULL;
+ u8 *ptr, *end, *nonzero;
+ u32 goal, rsv_bytes;
+ struct gfs2_blkreserv *rs;
+ u32 best_rs_bytes, unclaimed;
+ int best_rs_blocks;
+
+ /* Find bitmap block that contains bits for goal block */
+ if (rgrp_contains_block(rgd, ip->i_goal))
+ goal = ip->i_goal - rgd->rd_data0;
+ else
+ goal = rgd->rd_last_alloc;
+ 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:
+ best_rs_blocks = max_t(int, atomic_read(&ip->i_res->rs_sizehint),
+ (RGRP_RSRV_MINBLKS * rgd->rd_length));
+ best_rs_bytes = (best_rs_blocks *
+ (1 + (RSRV_CONTENTION_FACTOR * rgd->rd_rs_cnt))) /
+ GFS2_NBBY; /* 1 + is for our not-yet-created reservation */
+ best_rs_bytes = ALIGN(best_rs_bytes, sizeof(u64));
+ unclaimed = unclaimed_blocks(rgd);
+ if (best_rs_bytes * GFS2_NBBY > unclaimed)
+ best_rs_bytes = unclaimed >> GFS2_BIT_SIZE;
+
+ for (x = 0; x <= length; x++) {
+ bi = rgd->rd_bits + buf;
+
+ if (test_bit(GBF_FULL, &bi->bi_flags))
+ goto skip;
+
+ WARN_ON(!buffer_uptodate(bi->bi_bh));
+ if (bi->bi_clone)
+ buffer = bi->bi_clone + bi->bi_offset;
+ else
+ buffer = bi->bi_bh->b_data + bi->bi_offset;
+
+ /* We have to keep the reservations aligned on u64 boundaries
+ otherwise we could get situations where a byte can't be
+ used because it's after a reservation, but a free bit still
+ is within the reservation's area. */
+ ptr = buffer + ALIGN(goal >> GFS2_BIT_SIZE, sizeof(u64));
+ end = (buffer + bi->bi_len);
+ while (ptr < end) {
+ rsv_bytes = 0;
+ if ((ptr + best_rs_bytes) <= end)
+ search_bytes = best_rs_bytes;
+ else
+ search_bytes = end - ptr;
+ BUG_ON(!search_bytes);
+ nonzero = memchr_inv(ptr, 0, search_bytes);
+ /* If the lot is all zeroes, reserve the whole size. If
+ there's enough zeroes to satisfy the request, use
+ what we can. If there's not enough, keep looking. */
+ if (nonzero == NULL)
+ rsv_bytes = search_bytes;
+ else if ((nonzero - ptr) * GFS2_NBBY >=
+ ip->i_res->rs_requested)
+ rsv_bytes = (nonzero - ptr);
+
+ if (rsv_bytes) {
+ blk = ((ptr - buffer) * GFS2_NBBY);
+ BUG_ON(blk >= bi->bi_len * GFS2_NBBY);
+ rs = rs_insert(bi, ip, blk,
+ rsv_bytes * GFS2_NBBY);
+ if (IS_ERR(rs))
+ return PTR_ERR(rs);
+ if (rs)
+ return 0;
+ }
+ ptr += ALIGN(search_bytes, sizeof(u64));
+ }
+skip:
+ /* Try next bitmap block (wrap back to rgrp header
+ if at end) */
+ buf++;
+ buf %= length;
+ goal = 0;
+ }
+
+ return BFITNOENT;
+}
+
/**
* 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:
+ * This will try to get a multi-block reservation first, and if that doesn't
+ * fit, it will take what it can.
*
* 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)
+static int try_rgrp_fit(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip)
{
- const struct gfs2_blkreserv *rs = ip->i_res;
+ 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)
+ /* Look for a multi-block reservation. */
+ if (unclaimed_blocks(rgd) >= RGRP_RSRV_MINBLKS &&
+ rg_mblk_search(rgd, ip) != BFITNOENT)
+ return 1;
+ if (unclaimed_blocks(rgd) >= 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;
+ return 0;
}
/**
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_rgrpd *begin = NULL;
struct gfs2_blkreserv *rs = ip->i_res;
int error = 0, rg_locked, flags = LM_FLAG_TRY;
u64 last_unlinked = NO_BLOCK;
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)
+ if (gfs2_rs_active(rs)) {
+ begin = rs->rs_rgd;
+ flags = 0; /* Yoda: Do or do not. There is no try */
+ } else if (ip->i_rgd && rgrp_contains_block(ip->i_rgd, ip->i_goal)) {
+ rs->rs_rgd = begin = ip->i_rgd;
+ } else {
+ rs->rs_rgd = begin = gfs2_blk2rgrpd(sdp, ip->i_goal, 1);
+ }
+ if (rs->rs_rgd == NULL)
return -EBADSLT;
while (loops < 3) {
rg_locked = 0;
- if (gfs2_glock_is_locked_by_me(rgd->rd_gl)) {
+ if (gfs2_glock_is_locked_by_me(rs->rs_rgd->rd_gl)) {
rg_locked = 1;
error = 0;
+ } else if (!loops && !gfs2_rs_active(rs) &&
+ rs->rs_rgd->rd_rs_cnt > RGRP_RSRV_MAX_CONTENDERS) {
+ /* If the rgrp already is maxed out for contenders,
+ we can eliminate it as a "first pass" without even
+ requesting the rgrp glock. */
+ error = GLR_TRYFAILED;
} else {
- error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
- flags, &rs->rs_rgd_gh);
+ error = gfs2_glock_nq_init(rs->rs_rgd->rd_gl,
+ LM_ST_EXCLUSIVE, flags,
+ &rs->rs_rgd_gh);
if (!error && sdp->sd_args.ar_rgrplvb) {
- error = update_rgrp_lvb(rgd);
+ error = update_rgrp_lvb(rs->rs_rgd);
if (error) {
gfs2_glock_dq_uninit(&rs->rs_rgd_gh);
return error;
}
switch (error) {
case 0:
- if (try_rgrp_fit(rgd, ip)) {
+ if (gfs2_rs_active(rs)) {
+ if (unclaimed_blocks(rs->rs_rgd) +
+ rs->rs_free >= rs->rs_requested) {
+ ip->i_rgd = rs->rs_rgd;
+ return 0;
+ }
+ /* We have a multi-block reservation, but the
+ rgrp doesn't have enough free blocks to
+ satisfy the request. Free the reservation
+ and look for a suitable rgrp. */
+ gfs2_rs_deltree(rs);
+ }
+ if (try_rgrp_fit(rs->rs_rgd, ip)) {
if (sdp->sd_args.ar_rgrplvb)
- gfs2_rgrp_bh_get(rgd);
- ip->i_rgd = rgd;
+ gfs2_rgrp_bh_get(rs->rs_rgd);
+ ip->i_rgd = rs->rs_rgd;
return 0;
}
- if (rgd->rd_flags & GFS2_RDF_CHECK) {
+ if (rs->rs_rgd->rd_flags & GFS2_RDF_CHECK) {
if (sdp->sd_args.ar_rgrplvb)
- gfs2_rgrp_bh_get(rgd);
- try_rgrp_unlink(rgd, &last_unlinked,
+ gfs2_rgrp_bh_get(rs->rs_rgd);
+ try_rgrp_unlink(rs->rs_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 */
+ rs->rs_rgd = gfs2_rgrpd_get_next(rs->rs_rgd);
+ rs->rs_rgd = rs->rs_rgd ? : begin; /* if NULL, wrap */
+ if (rs->rs_rgd != begin) /* If we didn't wrap */
break;
flags &= ~LM_FLAG_TRY;
{
struct gfs2_blkreserv *rs = ip->i_res;
+ if (!rs)
+ return;
+
+ if (!rs->rs_free)
+ gfs2_rs_deltree(rs);
+
if (rs->rs_rgd_gh.gh_gl)
gfs2_glock_dq_uninit(&rs->rs_rgd_gh);
rs->rs_requested = 0;
if (state != GFS2_BLKST_UNLINKED && bi->bi_clone)
buffer = bi->bi_clone + bi->bi_offset;
- biblk = gfs2_bitfit(buffer, bi->bi_len, goal, state);
+ while (1) {
+ struct gfs2_blkreserv *rs;
+ u32 rgblk;
+
+ biblk = gfs2_bitfit(buffer, bi->bi_len, goal, state);
+ if (biblk == BFITNOENT)
+ break;
+ /* Check if this block is reserved() */
+ rgblk = gfs2_bi2rgd_blk(bi, biblk);
+ rs = rs_find(rgd, rgblk);
+ if (rs == NULL)
+ break;
+
+ BUG_ON(rs->rs_bi != bi);
+ biblk = BFITNOENT;
+ /* This should jump to the first block after the
+ reservation. */
+ goal = rs->rs_biblk + rs->rs_free;
+ if (goal >= bi->bi_len * GFS2_NBBY)
+ break;
+ }
if (biblk != BFITNOENT)
break;
u32 blk, bool dinode, unsigned int *n)
{
const unsigned int elen = *n;
- u32 goal;
+ u32 goal, rgblk;
const u8 *buffer = NULL;
+ struct gfs2_blkreserv *rs;
*n = 0;
buffer = bi->bi_bh->b_data + bi->bi_offset;
goal++;
if (goal >= (bi->bi_len * GFS2_NBBY))
break;
+ rgblk = gfs2_bi2rgd_blk(bi, goal);
+ rs = rs_find(rgd, rgblk);
+ if (rs) /* Oops, we bumped into someone's reservation */
+ break;
if (gfs2_testbit(rgd, buffer, bi->bi_len, goal) !=
GFS2_BLKST_FREE)
break;
int gfs2_rgrp_dump(struct seq_file *seq, const struct gfs2_glock *gl)
{
- const struct gfs2_rgrpd *rgd = gl->gl_object;
+ struct gfs2_rgrpd *rgd = gl->gl_object;
+ struct gfs2_blkreserv *trs;
+ const struct rb_node *n;
+
if (rgd == NULL)
return 0;
- gfs2_print_dbg(seq, " R: n:%llu f:%02x b:%u/%u i:%u\n",
+ gfs2_print_dbg(seq, " R: n:%llu f:%02x b:%u/%u i:%u r:%u\n",
(unsigned long long)rgd->rd_addr, rgd->rd_flags,
- rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes);
+ rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes,
+ rgd->rd_reserved);
+ spin_lock(&rgd->rd_rsspin);
+ for (n = rb_first(&rgd->rd_rstree); n; n = rb_next(&trs->rs_node)) {
+ trs = rb_entry(n, struct gfs2_blkreserv, rs_node);
+ dump_rs(seq, trs);
+ }
+ spin_unlock(&rgd->rd_rsspin);
return 0;
}
rgd->rd_flags |= GFS2_RDF_ERROR;
}
+/**
+ * claim_reserved_blks - Claim previously reserved blocks
+ * @ip: the inode that's claiming the reservation
+ * @dinode: 1 if this block is a dinode block, otherwise data block
+ * @nblocks: desired extent length
+ *
+ * Lay claim to previously allocated block reservation blocks.
+ * Returns: Starting block number of the blocks claimed.
+ * Sets *nblocks to the actual extent length allocated.
+ */
+static u64 claim_reserved_blks(struct gfs2_inode *ip, bool dinode,
+ unsigned int *nblocks)
+{
+ struct gfs2_blkreserv *rs = ip->i_res;
+ struct gfs2_rgrpd *rgd = rs->rs_rgd;
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+ struct gfs2_bitmap *bi;
+ u64 start_block = gfs2_rs_startblk(rs);
+ const unsigned int elen = *nblocks;
+
+ /*BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));*/
+ gfs2_assert_withdraw(sdp, rgd);
+ /*BUG_ON(!gfs2_glock_is_locked_by_me(rgd->rd_gl));*/
+ bi = rs->rs_bi;
+ gfs2_trans_add_bh(rgd->rd_gl, bi->bi_bh, 1);
+
+ for (*nblocks = 0; *nblocks < elen && rs->rs_free; (*nblocks)++) {
+ /* Make sure the bitmap hasn't changed */
+ gfs2_setbit(rgd, bi->bi_clone, bi, rs->rs_biblk,
+ dinode ? GFS2_BLKST_DINODE : GFS2_BLKST_USED);
+ rs->rs_biblk++;
+ rs->rs_free--;
+
+ BUG_ON(!rgd->rd_reserved);
+ rgd->rd_reserved--;
+ dinode = false;
+ trace_gfs2_rs(ip, rs, TRACE_RS_CLAIM);
+ }
+
+ if (!rs->rs_free) {
+ struct gfs2_rgrpd *rgd = ip->i_res->rs_rgd;
+
+ gfs2_rs_deltree(rs);
+ /* -nblocks because we haven't returned to do the math yet.
+ I'm doing the math backwards to prevent negative numbers,
+ but think of it as:
+ if (unclaimed_blocks(rgd) - *nblocks >= RGRP_RSRV_MINBLKS */
+ if (unclaimed_blocks(rgd) >= RGRP_RSRV_MINBLKS + *nblocks)
+ rg_mblk_search(rgd, ip);
+ }
+ return start_block;
+}
+
/**
* 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)
+ * @nblocks: 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
*
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);
+ /* Check if we have a multi-block reservation, and if so, claim the
+ next free block from it. */
+ if (gfs2_rs_active(ip->i_res)) {
+ BUG_ON(!ip->i_res->rs_free);
+ rgd = ip->i_res->rs_rgd;
+ block = claim_reserved_blks(ip, dinode, nblocks);
+ } else {
+ rgd = ip->i_rgd;
- /* Since all blocks are reserved in advance, this shouldn't happen */
- if (blk == BFITNOENT)
- goto rgrp_error;
+ 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) {
+ printk(KERN_WARNING "BFITNOENT, nblocks=%u\n",
+ *nblocks);
+ printk(KERN_WARNING "FULL=%d\n",
+ test_bit(GBF_FULL, &rgd->rd_bits->bi_flags));
+ goto rgrp_error;
+ }
- block = gfs2_alloc_extent(rgd, bi, blk, dinode, nblocks);
+ block = gfs2_alloc_extent(rgd, bi, blk, dinode, nblocks);
+ }
ndata = *nblocks;
if (dinode)
ndata--;
brelse(dibh);
}
}
- if (rgd->rd_free < *nblocks)
+ if (rgd->rd_free < *nblocks) {
+ printk(KERN_WARNING "nblocks=%u\n", *nblocks);
goto rgrp_error;
+ }
rgd->rd_free -= *nblocks;
if (dinode) {
for (x = 0; x < rlist->rl_rgrps; x++)
gfs2_holder_uninit(&rlist->rl_ghs[x]);
kfree(rlist->rl_ghs);
+ rlist->rl_ghs = NULL;
}
}
projects / karo-tx-linux.git / commitdiff