Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-fixes

Pull GFS2 fixes from Steven Whitehouse:
 "Here are three GFS2 fixes for the current kernel tree.  These are all
  related to the block reservation code which was added at the merge
  window.  That code will be getting an update at the forthcoming merge
  window too.  In the mean time though there are a few smaller issues
  which should be fixed.

  The first patch resolves an issue with write sizes of greater than 32
  bits with the size hinting code.  The second ensures that the
  allocation data structure is initialised when using xattrs and the
  third takes into account allocations which may have been made by other
  nodes which affect a reservation on the local node."

* git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-fixes:
  GFS2: Take account of blockages when using reserved blocks
  GFS2: Fix missing allocation data for set/remove xattr
  GFS2: Make write size hinting code common

fs/gfs2/file.c

@@ -322,6 +322,29 @@ static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 	return -ENOTTY;
 }
 
+/**
+ * gfs2_size_hint - Give a hint to the size of a write request
+ * @file: The struct file
+ * @offset: The file offset of the write
+ * @size: The length of the write
+ *
+ * When we are about to do a write, this function records the total
+ * write size in order to provide a suitable hint to the lower layers
+ * about how many blocks will be required.
+ *
+ */
+
+static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
+{
+	struct inode *inode = filep->f_dentry->d_inode;
+	struct gfs2_sbd *sdp = GFS2_SB(inode);
+	struct gfs2_inode *ip = GFS2_I(inode);
+	size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift;
+	int hint = min_t(size_t, INT_MAX, blks);
+
+	atomic_set(&ip->i_res->rs_sizehint, hint);
+}
+
 /**
  * gfs2_allocate_page_backing - Use bmap to allocate blocks
  * @page: The (locked) page to allocate backing for
@@ -382,8 +405,7 @@ static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 	if (ret)
 		return ret;
 
-	atomic_set(&ip->i_res->rs_sizehint,
-		   PAGE_CACHE_SIZE >> sdp->sd_sb.sb_bsize_shift);
+	gfs2_size_hint(vma->vm_file, pos, PAGE_CACHE_SIZE);
 
 	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 	ret = gfs2_glock_nq(&gh);
@@ -663,7 +685,8 @@ static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 	if (ret)
 		return ret;
 
-	atomic_set(&ip->i_res->rs_sizehint, writesize >> sdp->sd_sb.sb_bsize_shift);
+	gfs2_size_hint(file, pos, writesize);
+
 	if (file->f_flags & O_APPEND) {
 		struct gfs2_holder gh;
 
@@ -789,7 +812,7 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
 	if (unlikely(error))
 		goto out_uninit;
 
-	atomic_set(&ip->i_res->rs_sizehint, len >> sdp->sd_sb.sb_bsize_shift);
+	gfs2_size_hint(file, offset, len);
 
 	while (len > 0) {
 		if (len < bytes)

fs/gfs2/inode.c

@@ -1722,6 +1722,8 @@ static int gfs2_setxattr(struct dentry *dentry, const char *name,
 	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 	ret = gfs2_glock_nq(&gh);
 	if (ret == 0) {
+		ret = gfs2_rs_alloc(ip);
+		if (ret == 0)
 			ret = generic_setxattr(dentry, name, data, size, flags);
 		gfs2_glock_dq(&gh);
 	}
@@ -1757,6 +1759,8 @@ static int gfs2_removexattr(struct dentry *dentry, const char *name)
 	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 	ret = gfs2_glock_nq(&gh);
 	if (ret == 0) {
+		ret = gfs2_rs_alloc(ip);
+		if (ret == 0)
 			ret = generic_removexattr(dentry, name);
 		gfs2_glock_dq(&gh);
 	}

fs/gfs2/rgrp.c

@@ -1961,7 +1961,7 @@ static void gfs2_rgrp_error(struct gfs2_rgrpd *rgd)
  * @dinode: 1 if this block is a dinode block, otherwise data block
  * @nblocks: desired extent length
  *
- * Lay claim to previously allocated block reservation blocks.
+ * Lay claim to previously reserved blocks.
  * Returns: Starting block number of the blocks claimed.
  * Sets *nblocks to the actual extent length allocated.
  */
@@ -1970,19 +1970,17 @@ static u64 claim_reserved_blks(struct gfs2_inode *ip, bool dinode,
 {
 	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 */
+		if (gfs2_testbit(rgd, bi->bi_bh->b_data + bi->bi_offset,
+				 bi->bi_len, rs->rs_biblk) != GFS2_BLKST_FREE)
+			break;
 		gfs2_setbit(rgd, bi->bi_clone, bi, rs->rs_biblk,
 			    dinode ? GFS2_BLKST_DINODE : GFS2_BLKST_USED);
 		rs->rs_biblk++;
@@ -1991,20 +1989,12 @@ static u64 claim_reserved_blks(struct gfs2_inode *ip, bool dinode,
 		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;
-
+	trace_gfs2_rs(ip, rs, TRACE_RS_CLAIM);
+	if (!rs->rs_free || *nblocks != elen)
 		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;
 }
 
@@ -2037,13 +2027,15 @@ int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *nblocks,
 	if (ip->i_res->rs_requested == 0)
 		return -ECANCELED;
 
-	/* Check if we have a multi-block reservation, and if so, claim the
-	   next free block from it. */
+	/* If we have a reservation, claim blocks 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 {
+		if (*nblocks)
+			goto found_blocks;
+	}
+
 	rgd = ip->i_rgd;
 
 	if (!dinode && rgrp_contains_block(rgd, ip->i_goal))
@@ -2053,18 +2045,16 @@ int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *nblocks,
 
 	blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, &bi);
 
-		/* Since all blocks are reserved in advance, this shouldn't
-		   happen */
+	/* 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 "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);
-	}
+found_blocks:
 	ndata = *nblocks;
 	if (dinode)
 		ndata--;