Merge remote-tracking branch 'origin/upstream-f2fs-stable-linux-4.4.y' into android-4.4

6944da0a68ca treewide: Use array_size in f2fs_kvzalloc()
f15443db99c3 treewide: Use array_size() in f2fs_kzalloc()
3ea03ea4bd09 treewide: Use array_size() in f2fs_kmalloc()
c41203299a52 overflow.h: Add allocation size calculation helpers
d400752f547f f2fs: fix to clear FI_VOLATILE_FILE correctly
853e7339b634 f2fs: let sync node IO interrupt async one
6a4540cf1984 f2fs: don't change wbc->sync_mode
588ecdfd7d02 f2fs: fix to update mtime correctly
1ae5aadab191 fs: f2fs: insert space around that ':' and ', '
39ee53e22320 fs: f2fs: add missing blank lines after declarations
d5b4710fcf38 fs: f2fs: changed variable type of offset "unsigned" to "loff_t"
c35da89531b3 f2fs: clean up symbol namespace
fcf37e16f3cb f2fs: make set_de_type() static
5d1633aa1071 f2fs: make __f2fs_write_data_pages() static
cc8093af7c42 f2fs: fix to avoid accessing cross the boundary
b7f559467095 f2fs: fix to let caller retry allocating block address
e48fcd857657 disable loading f2fs module on PAGE_SIZE > 4KB
02afc275a5bd f2fs: fix error path of move_data_page
0291bd36d076 f2fs: don't drop dentry pages after fs shutdown
a1259450b6db f2fs: fix to avoid race during access gc_thread pointer
d2e0f2f786a6 f2fs: clean up with clear_radix_tree_dirty_tag
c74034518fdc f2fs: fix to don't trigger writeback during recovery
e72a2cca82d8 f2fs: clear discard_wake earlier
b25a1872e9a5 f2fs: let discard thread wait a little longer if dev is busy
b125dfb20d18 f2fs: avoid stucking GC due to atomic write
405909e7f532 f2fs: introduce sbi->gc_mode to determine the policy
1f62e4702a34 f2fs: keep migration IO order in LFS mode
c4408c238722 f2fs: fix to wait page writeback during revoking atomic write
9db5be4af890 f2fs: Fix deadlock in shutdown ioctl
ed74404955cd f2fs: detect synchronous writeback more earlier
91e7d9d2ddbf mm: remove nr_pages argument from pagevec_lookup_{,range}_tag()
feb94dc82928 ceph: use pagevec_lookup_range_nr_tag()
f3aa4a25b8b0 mm: add variant of pagevec_lookup_range_tag() taking number of pages
8914877e374a mm: use pagevec_lookup_range_tag() in write_cache_pages()
26778b87a006 mm: use pagevec_lookup_range_tag() in __filemap_fdatawait_range()
94f1b99298bd nilfs2: use pagevec_lookup_range_tag()
160355d69f46 gfs2: use pagevec_lookup_range_tag()
564108e83a74 f2fs: use find_get_pages_tag() for looking up single page
6cf6fb8645ff f2fs: simplify page iteration loops
a05d8a6a2bde f2fs: use pagevec_lookup_range_tag()
18a4848ffded ext4: use pagevec_lookup_range_tag()
1c7be24f65cd ceph: use pagevec_lookup_range_tag()
e25fadabb5c7 btrfs: use pagevec_lookup_range_tag()
bf9510b162c4 mm: implement find_get_pages_range_tag()
461247b21fde f2fs: clean up with is_valid_blkaddr()
a5d0ccbc189a f2fs: fix to initialize min_mtime with ULLONG_MAX
9bb4d22cf5de f2fs: fix to let checkpoint guarantee atomic page persistence
cdcf2b3e2559 f2fs: fix to initialize i_current_depth according to inode type
331ae0c25b44 Revert "f2fs: add ovp valid_blocks check for bg gc victim to fg_gc"
2494cc7c0bcd f2fs: don't drop any page on f2fs_cp_error() case
0037c639e63d f2fs: fix spelling mistake: "extenstion" -> "extension"
2bba5b8eb867 f2fs: enhance sanity_check_raw_super() to avoid potential overflows
9bb86b63dc0f f2fs: treat volatile file's data as hot one
2cf64590361e f2fs: introduce release_discard_addr() for cleanup
03279ce90b46 f2fs: fix potential overflow
f46eddc4da48 f2fs: rename dio_rwsem to i_gc_rwsem
bb015824532c f2fs: move mnt_want_write_file after range check
8bb9a8da75d1 f2fs: fix missing clear FI_NO_PREALLOC in some error case
cb38cc4e1d02 f2fs: enforce fsync_mode=strict for renamed directory
26bf4e8a96aa f2fs: sanity check for total valid node blocks
78f8b0f46fa2 f2fs: sanity check on sit entry
ab758ada220f f2fs: avoid bug_on on corrupted inode
1a5d1966c0ca f2fs: give message and set need_fsck given broken node id
b025f6dfc018 f2fs: clean up commit_inmem_pages()
7aff5c69da4c f2fs: do not check F2FS_INLINE_DOTS in recover
23d00b02878e f2fs: remove duplicated dquot_initialize and fix error handling
937f4ef79e25 f2fs: stop issue discard if something wrong with f2fs
a6d74bb282ad f2fs: fix return value in f2fs_ioc_commit_atomic_write
258489ec5220 f2fs: allocate hot_data for atomic write more strictly
aa857e0f3b09 f2fs: check if inmem_pages list is empty correctly
9d77ded0a71d f2fs: fix race in between GC and atomic open
0d17eb90b56a f2fs: change le32 to le16 of f2fs_inode->i_extra_size
ea2813111f1f f2fs: check cur_valid_map_mir & raw_sit block count when flush sit entries
9190cadf38db f2fs: correct return value of f2fs_trim_fs
17f85d070886 f2fs: fix to show missing bits in FS_IOC_GETFLAGS
3e90db63fcfc f2fs: remove unneeded F2FS_PROJINHERIT_FL
298032d4d4a6 f2fs: don't use GFP_ZERO for page caches
fdf61219dc25 f2fs: issue all big range discards in umount process
cd79eb2b5e45 f2fs: remove redundant block plug
ec034d0f14ca f2fs: remove unmatched zero_user_segment when convert inline dentry
71aaced0e1ee f2fs: introduce private inode status mapping
e7724207f71e fscrypt: log the crypto algorithm implementations
4cbda579cd3d crypto: api - Add crypto_type_has_alg helper
b24dcaae8753 crypto: skcipher - Add low-level skcipher interface
a9146e423547 crypto: skcipher - Add helper to retrieve driver name
a0ca4bdf4744 crypto: skcipher - Add default key size helper
eb13e0b69296 fscrypt: add Speck128/256 support
27a0e77380a3 fscrypt: only derive the needed portion of the key
f68a71fa8f77 fscrypt: separate key lookup from key derivation
52359cf4fd6d fscrypt: use a common logging function
ff8e7c745e2b fscrypt: remove internal key size constants
7149dd4d39b5 fscrypt: remove unnecessary check for non-logon key type
56446c91422e fscrypt: make fscrypt_operations.max_namelen an integer
f572a22ef9a5 fscrypt: drop empty name check from fname_decrypt()
0077eff1d2e3 fscrypt: drop max_namelen check from fname_decrypt()
3f7af9d27fd6 fscrypt: don't special-case EOPNOTSUPP from fscrypt_get_encryption_info()
52c51f7b7bde fscrypt: don't clear flags on crypto transform
89b7fb82982f fscrypt: remove stale comment from fscrypt_d_revalidate()
d56de4e926ad fscrypt: remove error messages for skcipher_request_alloc() failure
f68d3b84aef1 fscrypt: remove unnecessary NULL check when allocating skcipher
fb10231825e9 fscrypt: clean up after fscrypt_prepare_lookup() conversions
39b144490606 fscrypt: use unbound workqueue for decryption

Change-Id: Ied79ecd97385c05ef26e6b7b24d250eee9ec4e47
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>

1 files changed, 180 insertions, 173 deletions

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 16aee2a7b8a9..b72fac4766a9 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -23,13 +23,28 @@
 #include "trace.h"
 #include <trace/events/f2fs.h>
 
-#define on_build_free_nids(nmi) mutex_is_locked(&(nm_i)->build_lock)
+#define on_f2fs_build_free_nids(nmi) mutex_is_locked(&(nm_i)->build_lock)
 
 static struct kmem_cache *nat_entry_slab;
 static struct kmem_cache *free_nid_slab;
 static struct kmem_cache *nat_entry_set_slab;
 
-bool available_free_memory(struct f2fs_sb_info *sbi, int type)
+/*
+ * Check whether the given nid is within node id range.
+ */
+int f2fs_check_nid_range(struct f2fs_sb_info *sbi, nid_t nid)
+{
+	if (unlikely(nid < F2FS_ROOT_INO(sbi) || nid >= NM_I(sbi)->max_nid)) {
+		set_sbi_flag(sbi, SBI_NEED_FSCK);
+		f2fs_msg(sbi->sb, KERN_WARNING,
+				"%s: out-of-range nid=%x, run fsck to fix.",
+				__func__, nid);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+bool f2fs_available_free_memory(struct f2fs_sb_info *sbi, int type)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	struct sysinfo val;
@@ -87,18 +102,10 @@ bool available_free_memory(struct f2fs_sb_info *sbi, int type)
 
 static void clear_node_page_dirty(struct page *page)
 {
-	struct address_space *mapping = page->mapping;
-	unsigned int long flags;
-
 	if (PageDirty(page)) {
-		spin_lock_irqsave(&mapping->tree_lock, flags);
-		radix_tree_tag_clear(&mapping->page_tree,
-				page_index(page),
-				PAGECACHE_TAG_DIRTY);
-		spin_unlock_irqrestore(&mapping->tree_lock, flags);
-
+		f2fs_clear_radix_tree_dirty_tag(page);
 		clear_page_dirty_for_io(page);
-		dec_page_count(F2FS_M_SB(mapping), F2FS_DIRTY_NODES);
+		dec_page_count(F2FS_P_SB(page), F2FS_DIRTY_NODES);
 	}
 	ClearPageUptodate(page);
 }
@@ -106,7 +113,7 @@ static void clear_node_page_dirty(struct page *page)
 static struct page *get_current_nat_page(struct f2fs_sb_info *sbi, nid_t nid)
 {
 	pgoff_t index = current_nat_addr(sbi, nid);
-	return get_meta_page(sbi, index);
+	return f2fs_get_meta_page(sbi, index);
 }
 
 static struct page *get_next_nat_page(struct f2fs_sb_info *sbi, nid_t nid)
@@ -123,8 +130,8 @@ static struct page *get_next_nat_page(struct f2fs_sb_info *sbi, nid_t nid)
 	dst_off = next_nat_addr(sbi, src_off);
 
 	/* get current nat block page with lock */
-	src_page = get_meta_page(sbi, src_off);
-	dst_page = grab_meta_page(sbi, dst_off);
+	src_page = f2fs_get_meta_page(sbi, src_off);
+	dst_page = f2fs_grab_meta_page(sbi, dst_off);
 	f2fs_bug_on(sbi, PageDirty(src_page));
 
 	src_addr = page_address(src_page);
@@ -260,7 +267,7 @@ static unsigned int __gang_lookup_nat_set(struct f2fs_nm_info *nm_i,
 							start, nr);
 }
 
-int need_dentry_mark(struct f2fs_sb_info *sbi, nid_t nid)
+int f2fs_need_dentry_mark(struct f2fs_sb_info *sbi, nid_t nid)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	struct nat_entry *e;
@@ -277,7 +284,7 @@ int need_dentry_mark(struct f2fs_sb_info *sbi, nid_t nid)
 	return need;
 }
 
-bool is_checkpointed_node(struct f2fs_sb_info *sbi, nid_t nid)
+bool f2fs_is_checkpointed_node(struct f2fs_sb_info *sbi, nid_t nid)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	struct nat_entry *e;
@@ -291,7 +298,7 @@ bool is_checkpointed_node(struct f2fs_sb_info *sbi, nid_t nid)
 	return is_cp;
 }
 
-bool need_inode_block_update(struct f2fs_sb_info *sbi, nid_t ino)
+bool f2fs_need_inode_block_update(struct f2fs_sb_info *sbi, nid_t ino)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	struct nat_entry *e;
@@ -364,8 +371,7 @@ static void set_node_addr(struct f2fs_sb_info *sbi, struct node_info *ni,
 			new_blkaddr == NULL_ADDR);
 	f2fs_bug_on(sbi, nat_get_blkaddr(e) == NEW_ADDR &&
 			new_blkaddr == NEW_ADDR);
-	f2fs_bug_on(sbi, nat_get_blkaddr(e) != NEW_ADDR &&
-			nat_get_blkaddr(e) != NULL_ADDR &&
+	f2fs_bug_on(sbi, is_valid_blkaddr(nat_get_blkaddr(e)) &&
 			new_blkaddr == NEW_ADDR);
 
 	/* increment version no as node is removed */
@@ -376,7 +382,7 @@ static void set_node_addr(struct f2fs_sb_info *sbi, struct node_info *ni,
 
 	/* change address */
 	nat_set_blkaddr(e, new_blkaddr);
-	if (new_blkaddr == NEW_ADDR || new_blkaddr == NULL_ADDR)
+	if (!is_valid_blkaddr(new_blkaddr))
 		set_nat_flag(e, IS_CHECKPOINTED, false);
 	__set_nat_cache_dirty(nm_i, e);
 
@@ -391,7 +397,7 @@ static void set_node_addr(struct f2fs_sb_info *sbi, struct node_info *ni,
 	up_write(&nm_i->nat_tree_lock);
 }
 
-int try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink)
+int f2fs_try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	int nr = nr_shrink;
@@ -413,7 +419,8 @@ int try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink)
 /*
  * This function always returns success
  */
-void get_node_info(struct f2fs_sb_info *sbi, nid_t nid, struct node_info *ni)
+void f2fs_get_node_info(struct f2fs_sb_info *sbi, nid_t nid,
+						struct node_info *ni)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
@@ -443,7 +450,7 @@ void get_node_info(struct f2fs_sb_info *sbi, nid_t nid, struct node_info *ni)
 
 	/* Check current segment summary */
 	down_read(&curseg->journal_rwsem);
-	i = lookup_journal_in_cursum(journal, NAT_JOURNAL, nid, 0);
+	i = f2fs_lookup_journal_in_cursum(journal, NAT_JOURNAL, nid, 0);
 	if (i >= 0) {
 		ne = nat_in_journal(journal, i);
 		node_info_from_raw_nat(ni, &ne);
@@ -458,7 +465,7 @@ void get_node_info(struct f2fs_sb_info *sbi, nid_t nid, struct node_info *ni)
 	index = current_nat_addr(sbi, nid);
 	up_read(&nm_i->nat_tree_lock);
 
-	page = get_meta_page(sbi, index);
+	page = f2fs_get_meta_page(sbi, index);
 	nat_blk = (struct f2fs_nat_block *)page_address(page);
 	ne = nat_blk->entries[nid - start_nid];
 	node_info_from_raw_nat(ni, &ne);
@@ -471,7 +478,7 @@ cache:
 /*
  * readahead MAX_RA_NODE number of node pages.
  */
-static void ra_node_pages(struct page *parent, int start, int n)
+static void f2fs_ra_node_pages(struct page *parent, int start, int n)
 {
 	struct f2fs_sb_info *sbi = F2FS_P_SB(parent);
 	struct blk_plug plug;
@@ -485,13 +492,13 @@ static void ra_node_pages(struct page *parent, int start, int n)
 	end = min(end, NIDS_PER_BLOCK);
 	for (i = start; i < end; i++) {
 		nid = get_nid(parent, i, false);
-		ra_node_page(sbi, nid);
+		f2fs_ra_node_page(sbi, nid);
 	}
 
 	blk_finish_plug(&plug);
 }
 
-pgoff_t get_next_page_offset(struct dnode_of_data *dn, pgoff_t pgofs)
+pgoff_t f2fs_get_next_page_offset(struct dnode_of_data *dn, pgoff_t pgofs)
 {
 	const long direct_index = ADDRS_PER_INODE(dn->inode);
 	const long direct_blks = ADDRS_PER_BLOCK;
@@ -606,7 +613,7 @@ got:
  * f2fs_unlock_op() only if ro is not set RDONLY_NODE.
  * In the case of RDONLY_NODE, we don't need to care about mutex.
  */
-int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode)
+int f2fs_get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
 	struct page *npage[4];
@@ -625,7 +632,7 @@ int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode)
 	npage[0] = dn->inode_page;
 
 	if (!npage[0]) {
-		npage[0] = get_node_page(sbi, nids[0]);
+		npage[0] = f2fs_get_node_page(sbi, nids[0]);
 		if (IS_ERR(npage[0]))
 			return PTR_ERR(npage[0]);
 	}
@@ -649,24 +656,24 @@ int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode)
 
 		if (!nids[i] && mode == ALLOC_NODE) {
 			/* alloc new node */
-			if (!alloc_nid(sbi, &(nids[i]))) {
+			if (!f2fs_alloc_nid(sbi, &(nids[i]))) {
 				err = -ENOSPC;
 				goto release_pages;
 			}
 
 			dn->nid = nids[i];
-			npage[i] = new_node_page(dn, noffset[i]);
+			npage[i] = f2fs_new_node_page(dn, noffset[i]);
 			if (IS_ERR(npage[i])) {
-				alloc_nid_failed(sbi, nids[i]);
+				f2fs_alloc_nid_failed(sbi, nids[i]);
 				err = PTR_ERR(npage[i]);
 				goto release_pages;
 			}
 
 			set_nid(parent, offset[i - 1], nids[i], i == 1);
-			alloc_nid_done(sbi, nids[i]);
+			f2fs_alloc_nid_done(sbi, nids[i]);
 			done = true;
 		} else if (mode == LOOKUP_NODE_RA && i == level && level > 1) {
-			npage[i] = get_node_page_ra(parent, offset[i - 1]);
+			npage[i] = f2fs_get_node_page_ra(parent, offset[i - 1]);
 			if (IS_ERR(npage[i])) {
 				err = PTR_ERR(npage[i]);
 				goto release_pages;
@@ -681,7 +688,7 @@ int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode)
 		}
 
 		if (!done) {
-			npage[i] = get_node_page(sbi, nids[i]);
+			npage[i] = f2fs_get_node_page(sbi, nids[i]);
 			if (IS_ERR(npage[i])) {
 				err = PTR_ERR(npage[i]);
 				f2fs_put_page(npage[0], 0);
@@ -720,15 +727,15 @@ static void truncate_node(struct dnode_of_data *dn)
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
 	struct node_info ni;
 
-	get_node_info(sbi, dn->nid, &ni);
+	f2fs_get_node_info(sbi, dn->nid, &ni);
 
 	/* Deallocate node address */
-	invalidate_blocks(sbi, ni.blk_addr);
+	f2fs_invalidate_blocks(sbi, ni.blk_addr);
 	dec_valid_node_count(sbi, dn->inode, dn->nid == dn->inode->i_ino);
 	set_node_addr(sbi, &ni, NULL_ADDR, false);
 
 	if (dn->nid == dn->inode->i_ino) {
-		remove_orphan_inode(sbi, dn->nid);
+		f2fs_remove_orphan_inode(sbi, dn->nid);
 		dec_valid_inode_count(sbi);
 		f2fs_inode_synced(dn->inode);
 	}
@@ -753,7 +760,7 @@ static int truncate_dnode(struct dnode_of_data *dn)
 		return 1;
 
 	/* get direct node */
-	page = get_node_page(F2FS_I_SB(dn->inode), dn->nid);
+	page = f2fs_get_node_page(F2FS_I_SB(dn->inode), dn->nid);
 	if (IS_ERR(page) && PTR_ERR(page) == -ENOENT)
 		return 1;
 	else if (IS_ERR(page))
@@ -762,7 +769,7 @@ static int truncate_dnode(struct dnode_of_data *dn)
 	/* Make dnode_of_data for parameter */
 	dn->node_page = page;
 	dn->ofs_in_node = 0;
-	truncate_data_blocks(dn);
+	f2fs_truncate_data_blocks(dn);
 	truncate_node(dn);
 	return 1;
 }
@@ -783,13 +790,13 @@ static int truncate_nodes(struct dnode_of_data *dn, unsigned int nofs,
 
 	trace_f2fs_truncate_nodes_enter(dn->inode, dn->nid, dn->data_blkaddr);
 
-	page = get_node_page(F2FS_I_SB(dn->inode), dn->nid);
+	page = f2fs_get_node_page(F2FS_I_SB(dn->inode), dn->nid);
 	if (IS_ERR(page)) {
 		trace_f2fs_truncate_nodes_exit(dn->inode, PTR_ERR(page));
 		return PTR_ERR(page);
 	}
 
-	ra_node_pages(page, ofs, NIDS_PER_BLOCK);
+	f2fs_ra_node_pages(page, ofs, NIDS_PER_BLOCK);
 
 	rn = F2FS_NODE(page);
 	if (depth < 3) {
@@ -859,7 +866,7 @@ static int truncate_partial_nodes(struct dnode_of_data *dn,
 	/* get indirect nodes in the path */
 	for (i = 0; i < idx + 1; i++) {
 		/* reference count'll be increased */
-		pages[i] = get_node_page(F2FS_I_SB(dn->inode), nid[i]);
+		pages[i] = f2fs_get_node_page(F2FS_I_SB(dn->inode), nid[i]);
 		if (IS_ERR(pages[i])) {
 			err = PTR_ERR(pages[i]);
 			idx = i - 1;
@@ -868,7 +875,7 @@ static int truncate_partial_nodes(struct dnode_of_data *dn,
 		nid[i + 1] = get_nid(pages[i], offset[i + 1], false);
 	}
 
-	ra_node_pages(pages[idx], offset[idx + 1], NIDS_PER_BLOCK);
+	f2fs_ra_node_pages(pages[idx], offset[idx + 1], NIDS_PER_BLOCK);
 
 	/* free direct nodes linked to a partial indirect node */
 	for (i = offset[idx + 1]; i < NIDS_PER_BLOCK; i++) {
@@ -905,7 +912,7 @@ fail:
 /*
  * All the block addresses of data and nodes should be nullified.
  */
-int truncate_inode_blocks(struct inode *inode, pgoff_t from)
+int f2fs_truncate_inode_blocks(struct inode *inode, pgoff_t from)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	int err = 0, cont = 1;
@@ -921,7 +928,7 @@ int truncate_inode_blocks(struct inode *inode, pgoff_t from)
 	if (level < 0)
 		return level;
 
-	page = get_node_page(sbi, inode->i_ino);
+	page = f2fs_get_node_page(sbi, inode->i_ino);
 	if (IS_ERR(page)) {
 		trace_f2fs_truncate_inode_blocks_exit(inode, PTR_ERR(page));
 		return PTR_ERR(page);
@@ -1001,7 +1008,7 @@ fail:
 }
 
 /* caller must lock inode page */
-int truncate_xattr_node(struct inode *inode)
+int f2fs_truncate_xattr_node(struct inode *inode)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	nid_t nid = F2FS_I(inode)->i_xattr_nid;
@@ -1011,7 +1018,7 @@ int truncate_xattr_node(struct inode *inode)
 	if (!nid)
 		return 0;
 
-	npage = get_node_page(sbi, nid);
+	npage = f2fs_get_node_page(sbi, nid);
 	if (IS_ERR(npage))
 		return PTR_ERR(npage);
 
@@ -1026,17 +1033,17 @@ int truncate_xattr_node(struct inode *inode)
  * Caller should grab and release a rwsem by calling f2fs_lock_op() and
  * f2fs_unlock_op().
  */
-int remove_inode_page(struct inode *inode)
+int f2fs_remove_inode_page(struct inode *inode)
 {
 	struct dnode_of_data dn;
 	int err;
 
 	set_new_dnode(&dn, inode, NULL, NULL, inode->i_ino);
-	err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
+	err = f2fs_get_dnode_of_data(&dn, 0, LOOKUP_NODE);
 	if (err)
 		return err;
 
-	err = truncate_xattr_node(inode);
+	err = f2fs_truncate_xattr_node(inode);
 	if (err) {
 		f2fs_put_dnode(&dn);
 		return err;
@@ -1045,7 +1052,7 @@ int remove_inode_page(struct inode *inode)
 	/* remove potential inline_data blocks */
 	if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 				S_ISLNK(inode->i_mode))
-		truncate_data_blocks_range(&dn, 1);
+		f2fs_truncate_data_blocks_range(&dn, 1);
 
 	/* 0 is possible, after f2fs_new_inode() has failed */
 	f2fs_bug_on(F2FS_I_SB(inode),
@@ -1056,7 +1063,7 @@ int remove_inode_page(struct inode *inode)
 	return 0;
 }
 
-struct page *new_inode_page(struct inode *inode)
+struct page *f2fs_new_inode_page(struct inode *inode)
 {
 	struct dnode_of_data dn;
 
@@ -1064,10 +1071,10 @@ struct page *new_inode_page(struct inode *inode)
 	set_new_dnode(&dn, inode, NULL, NULL, inode->i_ino);
 
 	/* caller should f2fs_put_page(page, 1); */
-	return new_node_page(&dn, 0);
+	return f2fs_new_node_page(&dn, 0);
 }
 
-struct page *new_node_page(struct dnode_of_data *dn, unsigned int ofs)
+struct page *f2fs_new_node_page(struct dnode_of_data *dn, unsigned int ofs)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
 	struct node_info new_ni;
@@ -1085,7 +1092,7 @@ struct page *new_node_page(struct dnode_of_data *dn, unsigned int ofs)
 		goto fail;
 
 #ifdef CONFIG_F2FS_CHECK_FS
-	get_node_info(sbi, dn->nid, &new_ni);
+	f2fs_get_node_info(sbi, dn->nid, &new_ni);
 	f2fs_bug_on(sbi, new_ni.blk_addr != NULL_ADDR);
 #endif
 	new_ni.nid = dn->nid;
@@ -1137,7 +1144,7 @@ static int read_node_page(struct page *page, int op_flags)
 	if (PageUptodate(page))
 		return LOCKED_PAGE;
 
-	get_node_info(sbi, page->index, &ni);
+	f2fs_get_node_info(sbi, page->index, &ni);
 
 	if (unlikely(ni.blk_addr == NULL_ADDR)) {
 		ClearPageUptodate(page);
@@ -1151,14 +1158,15 @@ static int read_node_page(struct page *page, int op_flags)
 /*
  * Readahead a node page
  */
-void ra_node_page(struct f2fs_sb_info *sbi, nid_t nid)
+void f2fs_ra_node_page(struct f2fs_sb_info *sbi, nid_t nid)
 {
 	struct page *apage;
 	int err;
 
 	if (!nid)
 		return;
-	f2fs_bug_on(sbi, check_nid_range(sbi, nid));
+	if (f2fs_check_nid_range(sbi, nid))
+		return;
 
 	rcu_read_lock();
 	apage = radix_tree_lookup(&NODE_MAPPING(sbi)->page_tree, nid);
@@ -1182,7 +1190,8 @@ static struct page *__get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid,
 
 	if (!nid)
 		return ERR_PTR(-ENOENT);
-	f2fs_bug_on(sbi, check_nid_range(sbi, nid));
+	if (f2fs_check_nid_range(sbi, nid))
+		return ERR_PTR(-EINVAL);
 repeat:
 	page = f2fs_grab_cache_page(NODE_MAPPING(sbi), nid, false);
 	if (!page)
@@ -1198,7 +1207,7 @@ repeat:
 	}
 
 	if (parent)
-		ra_node_pages(parent, start + 1, MAX_RA_NODE);
+		f2fs_ra_node_pages(parent, start + 1, MAX_RA_NODE);
 
 	lock_page(page);
 
@@ -1232,12 +1241,12 @@ out_err:
 	return page;
 }
 
-struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
+struct page *f2fs_get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
 {
 	return __get_node_page(sbi, nid, NULL, 0);
 }
 
-struct page *get_node_page_ra(struct page *parent, int start)
+struct page *f2fs_get_node_page_ra(struct page *parent, int start)
 {
 	struct f2fs_sb_info *sbi = F2FS_P_SB(parent);
 	nid_t nid = get_nid(parent, start, false);
@@ -1272,7 +1281,7 @@ static void flush_inline_data(struct f2fs_sb_info *sbi, nid_t ino)
 
 	ret = f2fs_write_inline_data(inode, page);
 	inode_dec_dirty_pages(inode);
-	remove_dirty_inode(inode);
+	f2fs_remove_dirty_inode(inode);
 	if (ret)
 		set_page_dirty(page);
 page_out:
@@ -1283,21 +1292,17 @@ iput_out:
 
 static struct page *last_fsync_dnode(struct f2fs_sb_info *sbi, nid_t ino)
 {
-	pgoff_t index, end;
+	pgoff_t index;
 	struct pagevec pvec;
 	struct page *last_page = NULL;
+	int nr_pages;
 
 	pagevec_init(&pvec, 0);
 	index = 0;
-	end = ULONG_MAX;
-
-	while (index <= end) {
-		int i, nr_pages;
-		nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
-				PAGECACHE_TAG_DIRTY,
-				min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
-		if (nr_pages == 0)
-			break;
+
+	while ((nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
+				PAGECACHE_TAG_DIRTY))) {
+		int i;
 
 		for (i = 0; i < nr_pages; i++) {
 			struct page *page = pvec.pages[i];
@@ -1363,11 +1368,8 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
 
 	trace_f2fs_writepage(page, NODE);
 
-	if (unlikely(f2fs_cp_error(sbi))) {
-		dec_page_count(sbi, F2FS_DIRTY_NODES);
-		unlock_page(page);
-		return 0;
-	}
+	if (unlikely(f2fs_cp_error(sbi)))
+		goto redirty_out;
 
 	if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 		goto redirty_out;
@@ -1383,7 +1385,7 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
 		down_read(&sbi->node_write);
 	}
 
-	get_node_info(sbi, nid, &ni);
+	f2fs_get_node_info(sbi, nid, &ni);
 
 	/* This page is already truncated */
 	if (unlikely(ni.blk_addr == NULL_ADDR)) {
@@ -1400,7 +1402,7 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
 	set_page_writeback(page);
 	ClearPageError(page);
 	fio.old_blkaddr = ni.blk_addr;
-	write_node_page(nid, &fio);
+	f2fs_do_write_node_page(nid, &fio);
 	set_node_addr(sbi, &ni, fio.new_blkaddr, is_fsync_dnode(page));
 	dec_page_count(sbi, F2FS_DIRTY_NODES);
 	up_read(&sbi->node_write);
@@ -1429,7 +1431,7 @@ redirty_out:
 	return AOP_WRITEPAGE_ACTIVATE;
 }
 
-void move_node_page(struct page *node_page, int gc_type)
+void f2fs_move_node_page(struct page *node_page, int gc_type)
 {
 	if (gc_type == FG_GC) {
 		struct writeback_control wbc = {
@@ -1466,16 +1468,17 @@ static int f2fs_write_node_page(struct page *page,
 	return __write_node_page(page, false, NULL, wbc, false, FS_NODE_IO);
 }
 
-int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
+int f2fs_fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
 			struct writeback_control *wbc, bool atomic)
 {
-	pgoff_t index, end;
+	pgoff_t index;
 	pgoff_t last_idx = ULONG_MAX;
 	struct pagevec pvec;
 	int ret = 0;
 	struct page *last_page = NULL;
 	bool marked = false;
 	nid_t ino = inode->i_ino;
+	int nr_pages;
 
 	if (atomic) {
 		last_page = last_fsync_dnode(sbi, ino);
@@ -1485,15 +1488,10 @@ int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
 retry:
 	pagevec_init(&pvec, 0);
 	index = 0;
-	end = ULONG_MAX;
-
-	while (index <= end) {
-		int i, nr_pages;
-		nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
-				PAGECACHE_TAG_DIRTY,
-				min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
-		if (nr_pages == 0)
-			break;
+
+	while ((nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
+				PAGECACHE_TAG_DIRTY))) {
+		int i;
 
 		for (i = 0; i < nr_pages; i++) {
 			struct page *page = pvec.pages[i];
@@ -1537,9 +1535,9 @@ continue_unlock:
 				if (IS_INODE(page)) {
 					if (is_inode_flag_set(inode,
 								FI_DIRTY_INODE))
-						update_inode(inode, page);
+						f2fs_update_inode(inode, page);
 					set_dentry_mark(page,
-						need_dentry_mark(sbi, ino));
+						f2fs_need_dentry_mark(sbi, ino));
 				}
 				/*  may be written by other thread */
 				if (!PageDirty(page))
@@ -1589,33 +1587,37 @@ out:
 	return ret ? -EIO: 0;
 }
 
-int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc,
+int f2fs_sync_node_pages(struct f2fs_sb_info *sbi,
+				struct writeback_control *wbc,
 				bool do_balance, enum iostat_type io_type)
 {
-	pgoff_t index, end;
+	pgoff_t index;
 	struct pagevec pvec;
 	int step = 0;
 	int nwritten = 0;
 	int ret = 0;
+	int nr_pages, done = 0;
 
 	pagevec_init(&pvec, 0);
 
 next_step:
 	index = 0;
-	end = ULONG_MAX;
-
-	while (index <= end) {
-		int i, nr_pages;
-		nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
-				PAGECACHE_TAG_DIRTY,
-				min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
-		if (nr_pages == 0)
-			break;
+
+	while (!done && (nr_pages = pagevec_lookup_tag(&pvec,
+			NODE_MAPPING(sbi), &index, PAGECACHE_TAG_DIRTY))) {
+		int i;
 
 		for (i = 0; i < nr_pages; i++) {
 			struct page *page = pvec.pages[i];
 			bool submitted = false;
 
+			/* give a priority to WB_SYNC threads */
+			if (atomic_read(&sbi->wb_sync_req[NODE]) &&
+					wbc->sync_mode == WB_SYNC_NONE) {
+				done = 1;
+				break;
+			}
+
 			/*
 			 * flushing sequence with step:
 			 * 0. indirect nodes
@@ -1694,29 +1696,22 @@ continue_unlock:
 	return ret;
 }
 
-int wait_on_node_pages_writeback(struct f2fs_sb_info *sbi, nid_t ino)
+int f2fs_wait_on_node_pages_writeback(struct f2fs_sb_info *sbi, nid_t ino)
 {
-	pgoff_t index = 0, end = ULONG_MAX;
+	pgoff_t index = 0;
 	struct pagevec pvec;
 	int ret2 = 0, ret = 0;
+	int nr_pages;
 
 	pagevec_init(&pvec, 0);
 
-	while (index <= end) {
-		int i, nr_pages;
-		nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
-				PAGECACHE_TAG_WRITEBACK,
-				min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
-		if (nr_pages == 0)
-			break;
+	while ((nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
+				PAGECACHE_TAG_WRITEBACK))) {
+		int i;
 
 		for (i = 0; i < nr_pages; i++) {
 			struct page *page = pvec.pages[i];
 
-			/* until radix tree lookup accepts end_index */
-			if (unlikely(page->index > end))
-				continue;
-
 			if (ino && ino_of_node(page) == ino) {
 				f2fs_wait_on_page_writeback(page, NODE, true);
 				if (TestClearPageError(page))
@@ -1753,14 +1748,21 @@ static int f2fs_write_node_pages(struct address_space *mapping,
 	if (get_pages(sbi, F2FS_DIRTY_NODES) < nr_pages_to_skip(sbi, NODE))
 		goto skip_write;
 
+	if (wbc->sync_mode == WB_SYNC_ALL)
+		atomic_inc(&sbi->wb_sync_req[NODE]);
+	else if (atomic_read(&sbi->wb_sync_req[NODE]))
+		goto skip_write;
+
 	trace_f2fs_writepages(mapping->host, wbc, NODE);
 
 	diff = nr_pages_to_write(sbi, NODE, wbc);
-	wbc->sync_mode = WB_SYNC_NONE;
 	blk_start_plug(&plug);
-	sync_node_pages(sbi, wbc, true, FS_NODE_IO);
+	f2fs_sync_node_pages(sbi, wbc, true, FS_NODE_IO);
 	blk_finish_plug(&plug);
 	wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff);
+
+	if (wbc->sync_mode == WB_SYNC_ALL)
+		atomic_dec(&sbi->wb_sync_req[NODE]);
 	return 0;
 
 skip_write:
@@ -1906,20 +1908,20 @@ static bool add_free_nid(struct f2fs_sb_info *sbi,
 		 *   Thread A             Thread B
 		 *  - f2fs_create
 		 *   - f2fs_new_inode
-		 *    - alloc_nid
+		 *    - f2fs_alloc_nid
 		 *     - __insert_nid_to_list(PREALLOC_NID)
 		 *                     - f2fs_balance_fs_bg
-		 *                      - build_free_nids
-		 *                       - __build_free_nids
+		 *                      - f2fs_build_free_nids
+		 *                       - __f2fs_build_free_nids
 		 *                        - scan_nat_page
 		 *                         - add_free_nid
 		 *                          - __lookup_nat_cache
 		 *  - f2fs_add_link
-		 *   - init_inode_metadata
-		 *    - new_inode_page
-		 *     - new_node_page
+		 *   - f2fs_init_inode_metadata
+		 *    - f2fs_new_inode_page
+		 *     - f2fs_new_node_page
 		 *      - set_node_addr
-		 *  - alloc_nid_done
+		 *  - f2fs_alloc_nid_done
 		 *   - __remove_nid_from_list(PREALLOC_NID)
 		 *                         - __insert_nid_to_list(FREE_NID)
 		 */
@@ -2051,7 +2053,8 @@ out:
 	up_read(&nm_i->nat_tree_lock);
 }
 
-static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
+static void __f2fs_build_free_nids(struct f2fs_sb_info *sbi,
+						bool sync, bool mount)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	int i = 0;
@@ -2064,7 +2067,7 @@ static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
 	if (nm_i->nid_cnt[FREE_NID] >= NAT_ENTRY_PER_BLOCK)
 		return;
 
-	if (!sync && !available_free_memory(sbi, FREE_NIDS))
+	if (!sync && !f2fs_available_free_memory(sbi, FREE_NIDS))
 		return;
 
 	if (!mount) {
@@ -2076,7 +2079,7 @@ static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
 	}
 
 	/* readahead nat pages to be scanned */
-	ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), FREE_NID_PAGES,
+	f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), FREE_NID_PAGES,
 							META_NAT, true);
 
 	down_read(&nm_i->nat_tree_lock);
@@ -2106,14 +2109,14 @@ static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
 
 	up_read(&nm_i->nat_tree_lock);
 
-	ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nm_i->next_scan_nid),
+	f2fs_ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nm_i->next_scan_nid),
 					nm_i->ra_nid_pages, META_NAT, false);
 }
 
-void build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
+void f2fs_build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
 {
 	mutex_lock(&NM_I(sbi)->build_lock);
-	__build_free_nids(sbi, sync, mount);
+	__f2fs_build_free_nids(sbi, sync, mount);
 	mutex_unlock(&NM_I(sbi)->build_lock);
 }
 
@@ -2122,7 +2125,7 @@ void build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
  * from second parameter of this function.
  * The returned nid could be used ino as well as nid when inode is created.
  */
-bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid)
+bool f2fs_alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	struct free_nid *i = NULL;
@@ -2140,8 +2143,8 @@ retry:
 		return false;
 	}
 
-	/* We should not use stale free nids created by build_free_nids */
-	if (nm_i->nid_cnt[FREE_NID] && !on_build_free_nids(nm_i)) {
+	/* We should not use stale free nids created by f2fs_build_free_nids */
+	if (nm_i->nid_cnt[FREE_NID] && !on_f2fs_build_free_nids(nm_i)) {
 		f2fs_bug_on(sbi, list_empty(&nm_i->free_nid_list));
 		i = list_first_entry(&nm_i->free_nid_list,
 					struct free_nid, list);
@@ -2158,14 +2161,14 @@ retry:
 	spin_unlock(&nm_i->nid_list_lock);
 
 	/* Let's scan nat pages and its caches to get free nids */
-	build_free_nids(sbi, true, false);
+	f2fs_build_free_nids(sbi, true, false);
 	goto retry;
 }
 
 /*
- * alloc_nid() should be called prior to this function.
+ * f2fs_alloc_nid() should be called prior to this function.
  */
-void alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid)
+void f2fs_alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	struct free_nid *i;
@@ -2180,9 +2183,9 @@ void alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid)
 }
 
 /*
- * alloc_nid() should be called prior to this function.
+ * f2fs_alloc_nid() should be called prior to this function.
  */
-void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
+void f2fs_alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	struct free_nid *i;
@@ -2195,7 +2198,7 @@ void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
 	i = __lookup_free_nid_list(nm_i, nid);
 	f2fs_bug_on(sbi, !i);
 
-	if (!available_free_memory(sbi, FREE_NIDS)) {
+	if (!f2fs_available_free_memory(sbi, FREE_NIDS)) {
 		__remove_free_nid(sbi, i, PREALLOC_NID);
 		need_free = true;
 	} else {
@@ -2212,7 +2215,7 @@ void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
 		kmem_cache_free(free_nid_slab, i);
 }
 
-int try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink)
+int f2fs_try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	struct free_nid *i, *next;
@@ -2240,14 +2243,14 @@ int try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink)
 	return nr - nr_shrink;
 }
 
-void recover_inline_xattr(struct inode *inode, struct page *page)
+void f2fs_recover_inline_xattr(struct inode *inode, struct page *page)
 {
 	void *src_addr, *dst_addr;
 	size_t inline_size;
 	struct page *ipage;
 	struct f2fs_inode *ri;
 
-	ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
+	ipage = f2fs_get_node_page(F2FS_I_SB(inode), inode->i_ino);
 	f2fs_bug_on(F2FS_I_SB(inode), IS_ERR(ipage));
 
 	ri = F2FS_INODE(page);
@@ -2265,11 +2268,11 @@ void recover_inline_xattr(struct inode *inode, struct page *page)
 	f2fs_wait_on_page_writeback(ipage, NODE, true);
 	memcpy(dst_addr, src_addr, inline_size);
 update_inode:
-	update_inode(inode, ipage);
+	f2fs_update_inode(inode, ipage);
 	f2fs_put_page(ipage, 1);
 }
 
-int recover_xattr_data(struct inode *inode, struct page *page)
+int f2fs_recover_xattr_data(struct inode *inode, struct page *page)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	nid_t prev_xnid = F2FS_I(inode)->i_xattr_nid;
@@ -2282,25 +2285,25 @@ int recover_xattr_data(struct inode *inode, struct page *page)
 		goto recover_xnid;
 
 	/* 1: invalidate the previous xattr nid */
-	get_node_info(sbi, prev_xnid, &ni);
-	invalidate_blocks(sbi, ni.blk_addr);
+	f2fs_get_node_info(sbi, prev_xnid, &ni);
+	f2fs_invalidate_blocks(sbi, ni.blk_addr);
 	dec_valid_node_count(sbi, inode, false);
 	set_node_addr(sbi, &ni, NULL_ADDR, false);
 
 recover_xnid:
 	/* 2: update xattr nid in inode */
-	if (!alloc_nid(sbi, &new_xnid))
+	if (!f2fs_alloc_nid(sbi, &new_xnid))
 		return -ENOSPC;
 
 	set_new_dnode(&dn, inode, NULL, NULL, new_xnid);
-	xpage = new_node_page(&dn, XATTR_NODE_OFFSET);
+	xpage = f2fs_new_node_page(&dn, XATTR_NODE_OFFSET);
 	if (IS_ERR(xpage)) {
-		alloc_nid_failed(sbi, new_xnid);
+		f2fs_alloc_nid_failed(sbi, new_xnid);
 		return PTR_ERR(xpage);
 	}
 
-	alloc_nid_done(sbi, new_xnid);
-	update_inode_page(inode);
+	f2fs_alloc_nid_done(sbi, new_xnid);
+	f2fs_update_inode_page(inode);
 
 	/* 3: update and set xattr node page dirty */
 	memcpy(F2FS_NODE(xpage), F2FS_NODE(page), VALID_XATTR_BLOCK_SIZE);
@@ -2311,14 +2314,14 @@ recover_xnid:
 	return 0;
 }
 
-int recover_inode_page(struct f2fs_sb_info *sbi, struct page *page)
+int f2fs_recover_inode_page(struct f2fs_sb_info *sbi, struct page *page)
 {
 	struct f2fs_inode *src, *dst;
 	nid_t ino = ino_of_node(page);
 	struct node_info old_ni, new_ni;
 	struct page *ipage;
 
-	get_node_info(sbi, ino, &old_ni);
+	f2fs_get_node_info(sbi, ino, &old_ni);
 
 	if (unlikely(old_ni.blk_addr != NULL_ADDR))
 		return -EINVAL;
@@ -2372,7 +2375,7 @@ retry:
 	return 0;
 }
 
-void restore_node_summary(struct f2fs_sb_info *sbi,
+void f2fs_restore_node_summary(struct f2fs_sb_info *sbi,
 			unsigned int segno, struct f2fs_summary_block *sum)
 {
 	struct f2fs_node *rn;
@@ -2389,10 +2392,10 @@ void restore_node_summary(struct f2fs_sb_info *sbi,
 		nrpages = min(last_offset - i, BIO_MAX_PAGES);
 
 		/* readahead node pages */
-		ra_meta_pages(sbi, addr, nrpages, META_POR, true);
+		f2fs_ra_meta_pages(sbi, addr, nrpages, META_POR, true);
 
 		for (idx = addr; idx < addr + nrpages; idx++) {
-			struct page *page = get_tmp_page(sbi, idx);
+			struct page *page = f2fs_get_tmp_page(sbi, idx);
 
 			rn = F2FS_NODE(page);
 			sum_entry->nid = rn->footer.nid;
@@ -2534,7 +2537,7 @@ static void __flush_nat_entry_set(struct f2fs_sb_info *sbi,
 		f2fs_bug_on(sbi, nat_get_blkaddr(ne) == NEW_ADDR);
 
 		if (to_journal) {
-			offset = lookup_journal_in_cursum(journal,
+			offset = f2fs_lookup_journal_in_cursum(journal,
 							NAT_JOURNAL, nid, 1);
 			f2fs_bug_on(sbi, offset < 0);
 			raw_ne = &nat_in_journal(journal, offset);
@@ -2571,7 +2574,7 @@ static void __flush_nat_entry_set(struct f2fs_sb_info *sbi,
 /*
  * This function is called during the checkpointing process.
  */
-void flush_nat_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
+void f2fs_flush_nat_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
@@ -2634,7 +2637,7 @@ static int __get_nat_bitmaps(struct f2fs_sb_info *sbi)
 	nat_bits_addr = __start_cp_addr(sbi) + sbi->blocks_per_seg -
 						nm_i->nat_bits_blocks;
 	for (i = 0; i < nm_i->nat_bits_blocks; i++) {
-		struct page *page = get_meta_page(sbi, nat_bits_addr++);
+		struct page *page = f2fs_get_meta_page(sbi, nat_bits_addr++);
 
 		memcpy(nm_i->nat_bits + (i << F2FS_BLKSIZE_BITS),
 					page_address(page), F2FS_BLKSIZE);
@@ -2753,8 +2756,10 @@ static int init_free_nid_cache(struct f2fs_sb_info *sbi)
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	int i;
 
-	nm_i->free_nid_bitmap = f2fs_kzalloc(sbi, nm_i->nat_blocks *
-				sizeof(unsigned char *), GFP_KERNEL);
+	nm_i->free_nid_bitmap =
+		f2fs_kzalloc(sbi, array_size(sizeof(unsigned char *),
+					     nm_i->nat_blocks),
+			     GFP_KERNEL);
 	if (!nm_i->free_nid_bitmap)
 		return -ENOMEM;
 
@@ -2770,14 +2775,16 @@ static int init_free_nid_cache(struct f2fs_sb_info *sbi)
 	if (!nm_i->nat_block_bitmap)
 		return -ENOMEM;
 
-	nm_i->free_nid_count = f2fs_kvzalloc(sbi, nm_i->nat_blocks *
-					sizeof(unsigned short), GFP_KERNEL);
+	nm_i->free_nid_count =
+		f2fs_kvzalloc(sbi, array_size(sizeof(unsigned short),
+					      nm_i->nat_blocks),
+			      GFP_KERNEL);
 	if (!nm_i->free_nid_count)
 		return -ENOMEM;
 	return 0;
 }
 
-int build_node_manager(struct f2fs_sb_info *sbi)
+int f2fs_build_node_manager(struct f2fs_sb_info *sbi)
 {
 	int err;
 
@@ -2797,11 +2804,11 @@ int build_node_manager(struct f2fs_sb_info *sbi)
 	/* load free nid status from nat_bits table */
 	load_free_nid_bitmap(sbi);
 
-	build_free_nids(sbi, true, true);
+	f2fs_build_free_nids(sbi, true, true);
 	return 0;
 }
 
-void destroy_node_manager(struct f2fs_sb_info *sbi)
+void f2fs_destroy_node_manager(struct f2fs_sb_info *sbi)
 {
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
 	struct free_nid *i, *next_i;
@@ -2873,7 +2880,7 @@ void destroy_node_manager(struct f2fs_sb_info *sbi)
 	kfree(nm_i);
 }
 
-int __init create_node_manager_caches(void)
+int __init f2fs_create_node_manager_caches(void)
 {
 	nat_entry_slab = f2fs_kmem_cache_create("nat_entry",
 			sizeof(struct nat_entry));
@@ -2899,7 +2906,7 @@ fail:
 	return -ENOMEM;
 }
 
-void destroy_node_manager_caches(void)
+void f2fs_destroy_node_manager_caches(void)
 {
 	kmem_cache_destroy(nat_entry_set_slab);
 	kmem_cache_destroy(free_nid_slab);