f2fs: add missing sysfs entries in documentation

This patch cleans up documentation to cover missing sysfs entries.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Documentation/filesystems/f2fs.txt

@@ -246,11 +246,14 @@ Files in /sys/fs/f2fs/<devname>
 ..............................................................................
  File                         Content
 
- gc_max_sleep_time            This tuning parameter controls the maximum sleep
+ gc_urgent_sleep_time         This parameter controls sleep time for gc_urgent.
+                              500 ms is set by default. See above gc_urgent.
+
+ gc_min_sleep_time            This tuning parameter controls the minimum sleep
                               time for the garbage collection thread. Time is
                               in milliseconds.
 
- gc_min_sleep_time            This tuning parameter controls the minimum sleep
+ gc_max_sleep_time            This tuning parameter controls the maximum sleep
                               time for the garbage collection thread. Time is
                               in milliseconds.
 
@@ -270,9 +273,6 @@ Files in /sys/fs/f2fs/<devname>
                               to 1, background thread starts to do GC by given
                               gc_urgent_sleep_time interval.
 
- gc_urgent_sleep_time         This parameter controls sleep time for gc_urgent.
-                              500 ms is set by default. See above gc_urgent.
-
  reclaim_segments             This parameter controls the number of prefree
                               segments to be reclaimed. If the number of prefree
 			      segments is larger than the number of segments
@@ -287,7 +287,16 @@ Files in /sys/fs/f2fs/<devname>
 			      checkpoint is triggered, and issued during the
 			      checkpoint. By default, it is disabled with 0.
 
- trim_sections                This parameter controls the number of sections
+ discard_granularity	      This parameter controls the granularity of discard
+			      command size. It will issue discard commands iif
+			      the size is larger than given granularity. Its
+			      unit size is 4KB, and 4 (=16KB) is set by default.
+			      The maximum value is 128 (=512KB).
+
+ reserved_blocks	      This parameter indicates the number of blocks that
+			      f2fs reserves internally for root.
+
+ batched_trim_sections	      This parameter controls the number of sections
                               to be trimmed out in batch mode when FITRIM
                               conducts. 32 sections is set by default.
 
@@ -309,11 +318,35 @@ Files in /sys/fs/f2fs/<devname>
 			      the number is less than this value, it triggers
 			      in-place-updates.
 
+ min_seq_blocks		      This parameter controls the threshold to serialize
+			      write IOs issued by multiple threads in parallel.
+
+ min_hot_blocks		      This parameter controls the threshold to allocate
+			      a hot data log for pending data blocks to write.
+
+ min_ssr_sections	      This parameter adds the threshold when deciding
+			      SSR block allocation. If this is large, SSR mode
+			      will be enabled early.
+
+ ram_thresh                   This parameter controls the memory footprint used
+			      by free nids and cached nat entries. By default,
+			      10 is set, which indicates 10 MB / 1 GB RAM.
+
+ ra_nid_pages		      When building free nids, F2FS reads NAT blocks
+			      ahead for speed up. Default is 0.
+
+ dirty_nats_ratio	      Given dirty ratio of cached nat entries, F2FS
+			      determines flushing them in background.
+
  max_victim_search	      This parameter controls the number of trials to
 			      find a victim segment when conducting SSR and
 			      cleaning operations. The default value is 4096
 			      which covers 8GB block address range.
 
+ migration_granularity	      For large-sized sections, F2FS can stop GC given
+			      this granularity instead of reclaiming entire
+			      section.
+
  dir_level                    This parameter controls the directory level to
 			      support large directory. If a directory has a
 			      number of files, it can reduce the file lookup
@@ -321,9 +354,47 @@ Files in /sys/fs/f2fs/<devname>
 			      Otherwise, it needs to decrease this value to
 			      reduce the space overhead. The default value is 0.
 
- ram_thresh                   This parameter controls the memory footprint used
+ cp_interval		      F2FS tries to do checkpoint periodically, 60 secs
-			      by free nids and cached nat entries. By default,
+			      by default.
-			      10 is set, which indicates 10 MB / 1 GB RAM.
+
+ idle_interval		      F2FS detects system is idle, if there's no F2FS
+			      operations during given interval, 5 secs by
+			      default.
+
+ discard_idle_interval	      F2FS detects the discard thread is idle, given
+			      time interval. Default is 5 secs.
+
+ gc_idle_interval	      F2FS detects the GC thread is idle, given time
+			      interval. Default is 5 secs.
+
+ umount_discard_timeout       When unmounting the disk, F2FS waits for finishing
+			      queued discard commands which can take huge time.
+			      This gives time out for it, 5 secs by default.
+
+ iostat_enable		      This controls to enable/disable iostat in F2FS.
+
+ readdir_ra		      This enables/disabled readahead of inode blocks
+			      in readdir, and default is enabled.
+
+ gc_pin_file_thresh	      This indicates how many GC can be failed for the
+			      pinned file. If it exceeds this, F2FS doesn't
+			      guarantee its pinning state. 2048 trials is set
+			      by default.
+
+ extension_list		      This enables to change extension_list for hot/cold
+			      files in runtime.
+
+ inject_rate		      This controls injection rate of arbitrary faults.
+
+ inject_type		      This controls injection type of arbitrary faults.
+
+ dirty_segments 	      This shows # of dirty segments.
+
+ lifetime_write_kbytes	      This shows # of data written to the disk.
+
+ features		      This shows current features enabled on F2FS.
+
+ current_reserved_blocks      This shows # of blocks currently reserved.
 
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 USAGE