1 files changed, 81 insertions, 120 deletions

diff --git a/fs/ubifs/misc.h b/fs/ubifs/misc.h
index 4beccfc256d..ee7cb5ebb6e 100644
--- a/fs/ubifs/misc.h
+++ b/fs/ubifs/misc.h
@@ -39,6 +39,29 @@ static inline int ubifs_zn_dirty(const struct ubifs_znode *znode)
 }
 
 /**
+ * ubifs_zn_obsolete - check if znode is obsolete.
+ * @znode: znode to check
+ *
+ * This helper function returns %1 if @znode is obsolete and %0 otherwise.
+ */
+static inline int ubifs_zn_obsolete(const struct ubifs_znode *znode)
+{
+	return !!test_bit(OBSOLETE_ZNODE, &znode->flags);
+}
+
+/**
+ * ubifs_zn_cow - check if znode has to be copied on write.
+ * @znode: znode to check
+ *
+ * This helper function returns %1 if @znode is has COW flag set and %0
+ * otherwise.
+ */
+static inline int ubifs_zn_cow(const struct ubifs_znode *znode)
+{
+	return !!test_bit(COW_ZNODE, &znode->flags);
+}
+
+/**
  * ubifs_wake_up_bgt - wake up background thread.
  * @c: UBIFS file-system description object
  */
@@ -80,20 +103,6 @@ static inline struct ubifs_inode *ubifs_inode(const struct inode *inode)
 }
 
 /**
- * ubifs_ro_mode - switch UBIFS to read read-only mode.
- * @c: UBIFS file-system description object
- * @err: error code which is the reason of switching to R/O mode
- */
-static inline void ubifs_ro_mode(struct ubifs_info *c, int err)
-{
-	if (!c->ro_media) {
-		c->ro_media = 1;
-		ubifs_warn("switched to read-only mode, error %d", err);
-		dbg_dump_stack();
-	}
-}
-
-/**
  * ubifs_compr_present - check if compressor was compiled in.
  * @compr_type: compressor type to check
  *
@@ -136,83 +145,6 @@ static inline int ubifs_wbuf_sync(struct ubifs_wbuf *wbuf)
 }
 
 /**
- * ubifs_leb_unmap - unmap an LEB.
- * @c: UBIFS file-system description object
- * @lnum: LEB number to unmap
- *
- * This function returns %0 on success and a negative error code on failure.
- */
-static inline int ubifs_leb_unmap(const struct ubifs_info *c, int lnum)
-{
-	int err;
-
-	if (c->ro_media)
-		return -EROFS;
-	err = ubi_leb_unmap(c->ubi, lnum);
-	if (err) {
-		ubifs_err("unmap LEB %d failed, error %d", lnum, err);
-		return err;
-	}
-
-	return 0;
-}
-
-/**
- * ubifs_leb_write - write to a LEB.
- * @c: UBIFS file-system description object
- * @lnum: LEB number to write
- * @buf: buffer to write from
- * @offs: offset within LEB to write to
- * @len: length to write
- * @dtype: data type
- *
- * This function returns %0 on success and a negative error code on failure.
- */
-static inline int ubifs_leb_write(const struct ubifs_info *c, int lnum,
-				  const void *buf, int offs, int len, int dtype)
-{
-	int err;
-
-	if (c->ro_media)
-		return -EROFS;
-	err = ubi_leb_write(c->ubi, lnum, buf, offs, len, dtype);
-	if (err) {
-		ubifs_err("writing %d bytes at %d:%d, error %d",
-			  len, lnum, offs, err);
-		return err;
-	}
-
-	return 0;
-}
-
-/**
- * ubifs_leb_change - atomic LEB change.
- * @c: UBIFS file-system description object
- * @lnum: LEB number to write
- * @buf: buffer to write from
- * @len: length to write
- * @dtype: data type
- *
- * This function returns %0 on success and a negative error code on failure.
- */
-static inline int ubifs_leb_change(const struct ubifs_info *c, int lnum,
-				   const void *buf, int len, int dtype)
-{
-	int err;
-
-	if (c->ro_media)
-		return -EROFS;
-	err = ubi_leb_change(c->ubi, lnum, buf, len, dtype);
-	if (err) {
-		ubifs_err("changing %d bytes in LEB %d, error %d",
-			  len, lnum, err);
-		return err;
-	}
-
-	return 0;
-}
-
-/**
  * ubifs_encode_dev - encode device node IDs.
  * @dev: UBIFS device node information
  * @rdev: device IDs to encode
@@ -298,45 +230,74 @@ static inline void *ubifs_idx_key(const struct ubifs_info *c,
 }
 
 /**
- * ubifs_reported_space - calculate reported free space.
- * @c: the UBIFS file-system description object
- * @free: amount of free space
- *
- * This function calculates amount of free space which will be reported to
- * user-space. User-space application tend to expect that if the file-system
- * (e.g., via the 'statfs()' call) reports that it has N bytes available, they
- * are able to write a file of size N. UBIFS attaches node headers to each data
- * node and it has to write indexind nodes as well. This introduces additional
- * overhead, and UBIFS it has to report sligtly less free space to meet the
- * above expectetion.
- *
- * This function assumes free space is made up of uncompressed data nodes and
- * full index nodes (one per data node, doubled because we always allow enough
- * space to write the index twice).
+ * ubifs_current_time - round current time to time granularity.
+ * @inode: inode
+ */
+static inline struct timespec ubifs_current_time(struct inode *inode)
+{
+	return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
+		current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
+}
+
+/**
+ * ubifs_tnc_lookup - look up a file-system node.
+ * @c: UBIFS file-system description object
+ * @key: node key to lookup
+ * @node: the node is returned here
  *
- * Note, the calculation is pessimistic, which means that most of the time
- * UBIFS reports less space than it actually has.
+ * This function look up and reads node with key @key. The caller has to make
+ * sure the @node buffer is large enough to fit the node. Returns zero in case
+ * of success, %-ENOENT if the node was not found, and a negative error code in
+ * case of failure.
  */
-static inline long long ubifs_reported_space(const struct ubifs_info *c,
-					     uint64_t free)
+static inline int ubifs_tnc_lookup(struct ubifs_info *c,
+				   const union ubifs_key *key, void *node)
 {
-	int divisor, factor;
+	return ubifs_tnc_locate(c, key, node, NULL, NULL);
+}
 
-	divisor = UBIFS_MAX_DATA_NODE_SZ + (c->max_idx_node_sz << 1);
-	factor = UBIFS_MAX_DATA_NODE_SZ - UBIFS_DATA_NODE_SZ;
-	do_div(free, divisor);
+/**
+ * ubifs_get_lprops - get reference to LEB properties.
+ * @c: the UBIFS file-system description object
+ *
+ * This function locks lprops. Lprops have to be unlocked by
+ * 'ubifs_release_lprops()'.
+ */
+static inline void ubifs_get_lprops(struct ubifs_info *c)
+{
+	mutex_lock(&c->lp_mutex);
+}
 
-	return free * factor;
+/**
+ * ubifs_release_lprops - release lprops lock.
+ * @c: the UBIFS file-system description object
+ *
+ * This function has to be called after each 'ubifs_get_lprops()' call to
+ * unlock lprops.
+ */
+static inline void ubifs_release_lprops(struct ubifs_info *c)
+{
+	ubifs_assert(mutex_is_locked(&c->lp_mutex));
+	ubifs_assert(c->lst.empty_lebs >= 0 &&
+		     c->lst.empty_lebs <= c->main_lebs);
+	mutex_unlock(&c->lp_mutex);
 }
 
 /**
- * ubifs_current_time - round current time to time granularity.
- * @inode: inode
+ * ubifs_next_log_lnum - switch to the next log LEB.
+ * @c: UBIFS file-system description object
+ * @lnum: current log LEB
+ *
+ * This helper function returns the log LEB number which goes next after LEB
+ * 'lnum'.
  */
-static inline struct timespec ubifs_current_time(struct inode *inode)
+static inline int ubifs_next_log_lnum(const struct ubifs_info *c, int lnum)
 {
-	return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
-		current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
+	lnum += 1;
+	if (lnum > c->log_last)
+		lnum = UBIFS_LOG_LNUM;
+
+	return lnum;
 }
 
 #endif /* __UBIFS_MISC_H__ */