Merge tag 'gfs2-v5.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2

Pull gfs2 updates from Andreas Gruenbacher:
 "Various minor gfs2 cleanups and fixes"

* tag 'gfs2-v5.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: Clean up gfs2_unstuff_dinode
  gfs2: Unstuff before locking page in gfs2_page_mkwrite
  gfs2: Clean up the error handling in gfs2_page_mkwrite
  gfs2: Fix error handling in init_statfs
  gfs2: Fix underflow in gfs2_page_mkwrite
  gfs2: Use list_move_tail instead of list_del/list_add_tail
  gfs2: Fix do_gfs2_set_flags description

7 files changed, 85 insertions, 66 deletions

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 0bcf11a9987b..ed8b67b21718 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -56,14 +56,6 @@ static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
 			       u64 block, struct page *page)
 {
 	struct inode *inode = &ip->i_inode;
-	int release = 0;
-
-	if (!page || page->index) {
-		page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
-		if (!page)
-			return -ENOMEM;
-		release = 1;
-	}
 
 	if (!PageUptodate(page)) {
 		void *kaddr = kmap(page);
@@ -97,26 +89,10 @@ static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
 		gfs2_ordered_add_inode(ip);
 	}
 
-	if (release) {
-		unlock_page(page);
-		put_page(page);
-	}
-
 	return 0;
 }
 
-/**
- * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big
- * @ip: The GFS2 inode to unstuff
- * @page: The (optional) page. This is looked up if the @page is NULL
- *
- * This routine unstuffs a dinode and returns it to a "normal" state such
- * that the height can be grown in the traditional way.
- *
- * Returns: errno
- */
-
-int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
+static int __gfs2_unstuff_inode(struct gfs2_inode *ip, struct page *page)
 {
 	struct buffer_head *bh, *dibh;
 	struct gfs2_dinode *di;
@@ -124,11 +100,9 @@ int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
 	int isdir = gfs2_is_dir(ip);
 	int error;
 
-	down_write(&ip->i_rw_mutex);
-
 	error = gfs2_meta_inode_buffer(ip, &dibh);
 	if (error)
-		goto out;
+		return error;
 
 	if (i_size_read(&ip->i_inode)) {
 		/* Get a free block, fill it with the stuffed data,
@@ -170,12 +144,38 @@ int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
 
 out_brelse:
 	brelse(dibh);
+	return error;
+}
+
+/**
+ * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big
+ * @ip: The GFS2 inode to unstuff
+ *
+ * This routine unstuffs a dinode and returns it to a "normal" state such
+ * that the height can be grown in the traditional way.
+ *
+ * Returns: errno
+ */
+
+int gfs2_unstuff_dinode(struct gfs2_inode *ip)
+{
+	struct inode *inode = &ip->i_inode;
+	struct page *page;
+	int error;
+
+	down_write(&ip->i_rw_mutex);
+	page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
+	error = -ENOMEM;
+	if (!page)
+		goto out;
+	error = __gfs2_unstuff_inode(ip, page);
+	unlock_page(page);
+	put_page(page);
 out:
 	up_write(&ip->i_rw_mutex);
 	return error;
 }
 
-
 /**
  * find_metapath - Find path through the metadata tree
  * @sdp: The superblock
@@ -1079,7 +1079,7 @@ static int gfs2_iomap_begin_write(struct inode *inode, loff_t pos,
 			goto out_trans_fail;
 
 		if (unstuff) {
-			ret = gfs2_unstuff_dinode(ip, NULL);
+			ret = gfs2_unstuff_dinode(ip);
 			if (ret)
 				goto out_trans_end;
 			release_metapath(mp);
@@ -2143,7 +2143,7 @@ static int do_grow(struct inode *inode, u64 size)
 		goto do_grow_release;
 
 	if (unstuff) {
-		error = gfs2_unstuff_dinode(ip, NULL);
+		error = gfs2_unstuff_dinode(ip);
 		if (error)
 			goto do_end_trans;
 	}
diff --git a/fs/gfs2/bmap.h b/fs/gfs2/bmap.h
index 6676d863faef..53cce6c08e81 100644
--- a/fs/gfs2/bmap.h
+++ b/fs/gfs2/bmap.h
@@ -46,7 +46,7 @@ static inline void gfs2_write_calc_reserv(const struct gfs2_inode *ip,
 extern const struct iomap_ops gfs2_iomap_ops;
 extern const struct iomap_writeback_ops gfs2_writeback_ops;
 
-extern int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page);
+extern int gfs2_unstuff_dinode(struct gfs2_inode *ip);
 extern int gfs2_block_map(struct inode *inode, sector_t lblock,
 			  struct buffer_head *bh, int create);
 extern int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index 18f67b37d6f8..42b7dfffb5e7 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -172,7 +172,7 @@ static int gfs2_dir_write_data(struct gfs2_inode *ip, const char *buf,
 		return -EINVAL;
 
 	if (gfs2_is_stuffed(ip)) {
-		error = gfs2_unstuff_dinode(ip, NULL);
+		error = gfs2_unstuff_dinode(ip);
 		if (error)
 			return error;
 	}
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 493a83e3f590..84ec053d43b4 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -210,7 +210,7 @@ void gfs2_set_inode_flags(struct inode *inode)
 
 /**
  * do_gfs2_set_flags - set flags on an inode
- * @filp: file pointer
+ * @inode: The inode
  * @reqflags: The flags to set
  * @mask: Indicates which flags are valid
  * @fsflags: The FS_* inode flags passed in
@@ -427,22 +427,25 @@ static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
 	struct gfs2_alloc_parms ap = { .aflags = 0, };
 	u64 offset = page_offset(page);
 	unsigned int data_blocks, ind_blocks, rblocks;
+	vm_fault_t ret = VM_FAULT_LOCKED;
 	struct gfs2_holder gh;
 	unsigned int length;
 	loff_t size;
-	int ret;
+	int err;
 
 	sb_start_pagefault(inode->i_sb);
 
 	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
-	ret = gfs2_glock_nq(&gh);
-	if (ret)
+	err = gfs2_glock_nq(&gh);
+	if (err) {
+		ret = block_page_mkwrite_return(err);
 		goto out_uninit;
+	}
 
 	/* Check page index against inode size */
 	size = i_size_read(inode);
 	if (offset >= size) {
-		ret = -EINVAL;
+		ret = VM_FAULT_SIGBUS;
 		goto out_unlock;
 	}
 
@@ -450,8 +453,8 @@ static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
 	file_update_time(vmf->vma->vm_file);
 
 	/* page is wholly or partially inside EOF */
-	if (offset > size - PAGE_SIZE)
-		length = offset_in_page(size);
+	if (size - offset < PAGE_SIZE)
+		length = size - offset;
 	else
 		length = PAGE_SIZE;
 
@@ -469,24 +472,30 @@ static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
 	    !gfs2_write_alloc_required(ip, offset, length)) {
 		lock_page(page);
 		if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
-			ret = -EAGAIN;
+			ret = VM_FAULT_NOPAGE;
 			unlock_page(page);
 		}
 		goto out_unlock;
 	}
 
-	ret = gfs2_rindex_update(sdp);
-	if (ret)
+	err = gfs2_rindex_update(sdp);
+	if (err) {
+		ret = block_page_mkwrite_return(err);
 		goto out_unlock;
+	}
 
 	gfs2_write_calc_reserv(ip, length, &data_blocks, &ind_blocks);
 	ap.target = data_blocks + ind_blocks;
-	ret = gfs2_quota_lock_check(ip, &ap);
-	if (ret)
+	err = gfs2_quota_lock_check(ip, &ap);
+	if (err) {
+		ret = block_page_mkwrite_return(err);
 		goto out_unlock;
-	ret = gfs2_inplace_reserve(ip, &ap);
-	if (ret)
+	}
+	err = gfs2_inplace_reserve(ip, &ap);
+	if (err) {
+		ret = block_page_mkwrite_return(err);
 		goto out_quota_unlock;
+	}
 
 	rblocks = RES_DINODE + ind_blocks;
 	if (gfs2_is_jdata(ip))
@@ -495,28 +504,38 @@ static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
 		rblocks += RES_STATFS + RES_QUOTA;
 		rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
 	}
-	ret = gfs2_trans_begin(sdp, rblocks, 0);
-	if (ret)
+	err = gfs2_trans_begin(sdp, rblocks, 0);
+	if (err) {
+		ret = block_page_mkwrite_return(err);
 		goto out_trans_fail;
+	}
+
+	/* Unstuff, if required, and allocate backing blocks for page */
+	if (gfs2_is_stuffed(ip)) {
+		err = gfs2_unstuff_dinode(ip);
+		if (err) {
+			ret = block_page_mkwrite_return(err);
+			goto out_trans_end;
+		}
+	}
 
 	lock_page(page);
-	ret = -EAGAIN;
 	/* If truncated, we must retry the operation, we may have raced
 	 * with the glock demotion code.
 	 */
-	if (!PageUptodate(page) || page->mapping != inode->i_mapping)
-		goto out_trans_end;
+	if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
+		ret = VM_FAULT_NOPAGE;
+		goto out_page_locked;
+	}
 
-	/* Unstuff, if required, and allocate backing blocks for page */
-	ret = 0;
-	if (gfs2_is_stuffed(ip))
-		ret = gfs2_unstuff_dinode(ip, page);
-	if (ret == 0)
-		ret = gfs2_allocate_page_backing(page, length);
+	err = gfs2_allocate_page_backing(page, length);
+	if (err)
+		ret = block_page_mkwrite_return(err);
 
-out_trans_end:
-	if (ret)
+out_page_locked:
+	if (ret != VM_FAULT_LOCKED)
 		unlock_page(page);
+out_trans_end:
 	gfs2_trans_end(sdp);
 out_trans_fail:
 	gfs2_inplace_release(ip);
@@ -526,12 +545,12 @@ out_unlock:
 	gfs2_glock_dq(&gh);
 out_uninit:
 	gfs2_holder_uninit(&gh);
-	if (ret == 0) {
+	if (ret == VM_FAULT_LOCKED) {
 		set_page_dirty(page);
 		wait_for_stable_page(page);
 	}
 	sb_end_pagefault(inode->i_sb);
-	return block_page_mkwrite_return(ret);
+	return ret;
 }
 
 static vm_fault_t gfs2_fault(struct vm_fault *vmf)
@@ -962,7 +981,7 @@ static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
 	gfs2_trans_add_meta(ip->i_gl, dibh);
 
 	if (gfs2_is_stuffed(ip)) {
-		error = gfs2_unstuff_dinode(ip, NULL);
+		error = gfs2_unstuff_dinode(ip);
 		if (unlikely(error))
 			goto out;
 	}
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index d9cb261f55b0..1f3902ecdded 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -212,8 +212,7 @@ void gfs2_glock_add_to_lru(struct gfs2_glock *gl)
 
 	spin_lock(&lru_lock);
 
-	list_del(&gl->gl_lru);
-	list_add_tail(&gl->gl_lru, &lru_list);
+	list_move_tail(&gl->gl_lru, &lru_list);
 
 	if (!test_bit(GLF_LRU, &gl->gl_flags)) {
 		set_bit(GLF_LRU, &gl->gl_flags);
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 826f77d9cff5..5f4504dd0875 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -687,6 +687,7 @@ static int init_statfs(struct gfs2_sbd *sdp)
 	}
 
 	iput(pn);
+	pn = NULL;
 	ip = GFS2_I(sdp->sd_sc_inode);
 	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 				   &sdp->sd_sc_gh);
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 94637c307cc8..be0997e24d60 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -825,7 +825,7 @@ static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 	u64 size;
 
 	if (gfs2_is_stuffed(ip)) {
-		err = gfs2_unstuff_dinode(ip, NULL);
+		err = gfs2_unstuff_dinode(ip);
 		if (err)
 			return err;
 	}