nilfs2: clean up sketch file

The sketch file is a file to mark checkpoints with user data.  It was
experimentally introduced in the original implementation, and now
obsolete.  The file was handled differently with regular files; the file
size got truncated when a checkpoint was created.

This stops the special treatment and will treat it as a regular file.
Most users are not affected because mkfs.nilfs2 no longer makes this file.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 3 insertions, 89 deletions

diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index b6536bb2a324..a1922b17662c 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -418,30 +418,6 @@ int nilfs_read_inode_common(struct inode *inode,
         return 0;
 }
 
-static int nilfs_read_sketch_inode(struct inode *inode)
-{
-        struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
-        int err = 0;
-
-        if (sbi->s_snapshot_cno) {
-                struct the_nilfs *nilfs = sbi->s_nilfs;
-                struct buffer_head *bh_cp;
-                struct nilfs_checkpoint *raw_cp;
-
-                err = nilfs_cpfile_get_checkpoint(
-                        nilfs->ns_cpfile, sbi->s_snapshot_cno, 0, &raw_cp,
-                        &bh_cp);
-                if (likely(!err)) {
-                        if (!nilfs_checkpoint_sketch(raw_cp))
-                                inode->i_size = 0;
-                        nilfs_cpfile_put_checkpoint(
-                                nilfs->ns_cpfile, sbi->s_snapshot_cno, bh_cp);
-                }
-                inode->i_flags |= S_NOCMTIME;
-        }
-        return err;
-}
-
 static int __nilfs_read_inode(struct super_block *sb, unsigned long ino,
                               struct inode *inode)
 {
@@ -469,11 +445,6 @@ static int __nilfs_read_inode(struct super_block *sb, unsigned long ino,
                 inode->i_op = &nilfs_file_inode_operations;
                 inode->i_fop = &nilfs_file_operations;
                 inode->i_mapping->a_ops = &nilfs_aops;
-                if (unlikely(inode->i_ino == NILFS_SKETCH_INO)) {
-                        err = nilfs_read_sketch_inode(inode);
-                        if (unlikely(err))
-                                goto failed_unmap;
-                }
         } else if (S_ISDIR(inode->i_mode)) {
                 inode->i_op = &nilfs_dir_inode_operations;
                 inode->i_fop = &nilfs_dir_operations;
@@ -742,8 +713,7 @@ int nilfs_set_file_dirty(struct nilfs_sb_info *sbi, struct inode *inode,
 
         atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks);
 
-        if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state) ||
-            unlikely(inode->i_ino == NILFS_SKETCH_INO))
+        if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
                 return 0;
 
         spin_lock(&sbi->s_inode_lock);
@@ -811,7 +781,6 @@ void nilfs_dirty_inode(struct inode *inode)
                 return;
         }
         nilfs_transaction_begin(inode->i_sb, &ti, 0);
-        if (likely(inode->i_ino != NILFS_SKETCH_INO))
-                nilfs_mark_inode_dirty(inode);
+        nilfs_mark_inode_dirty(inode);
         nilfs_transaction_commit(inode->i_sb); /* never fails */
 }
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 9a87410985b9..981c34a0cd69 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -67,7 +67,6 @@ enum {
         NILFS_ST_INIT = 0,
         NILFS_ST_GC,            /* Collecting dirty blocks for GC */
         NILFS_ST_FILE,
-        NILFS_ST_SKETCH,
         NILFS_ST_IFILE,
         NILFS_ST_CPFILE,
         NILFS_ST_SUFILE,
@@ -887,8 +886,7 @@ static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci)
                 cpu_to_le64(sci->sc_nblk_inc + sci->sc_nblk_this_inc);
         raw_cp->cp_create = cpu_to_le64(sci->sc_seg_ctime);
         raw_cp->cp_cno = cpu_to_le64(nilfs->ns_cno);
-        if (sci->sc_sketch_inode && i_size_read(sci->sc_sketch_inode) > 0)
-                nilfs_checkpoint_set_sketch(raw_cp);
+
         nilfs_write_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode, 1);
         nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
         return 0;
@@ -923,11 +921,6 @@ static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info *sci,
                 nilfs_fill_in_file_bmap(ifile, ii);
                 set_bit(NILFS_I_COLLECTED, &ii->i_state);
         }
-        if (sci->sc_sketch_inode) {
-                ii = NILFS_I(sci->sc_sketch_inode);
-                if (test_bit(NILFS_I_DIRTY, &ii->i_state))
-                        nilfs_fill_in_file_bmap(ifile, ii);
-        }
 }
 
 /*
@@ -1228,26 +1221,6 @@ static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode)
                         sci->sc_stage.scnt = NILFS_ST_DONE;
                         return 0;
                 }
-                sci->sc_stage.scnt++;  /* Fall through */
-        case NILFS_ST_SKETCH:
-                if (mode == SC_LSEG_SR && sci->sc_sketch_inode) {
-                        ii = NILFS_I(sci->sc_sketch_inode);
-                        if (test_bit(NILFS_I_DIRTY, &ii->i_state)) {
-                                sci->sc_sketch_inode->i_ctime.tv_sec
-                                        = sci->sc_seg_ctime;
-                                sci->sc_sketch_inode->i_mtime.tv_sec
-                                        = sci->sc_seg_ctime;
-                                err = nilfs_mark_inode_dirty(
-                                        sci->sc_sketch_inode);
-                                if (unlikely(err))
-                                        goto break_or_fail;
-                        }
-                        err = nilfs_segctor_scan_file(sci,
-                                                      sci->sc_sketch_inode,
-                                                      &nilfs_sc_file_ops);
-                        if (unlikely(err))
-                                goto break_or_fail;
-                }
                 sci->sc_stage.scnt++;
                 sci->sc_stage.flags |= NILFS_CF_IFILE_STARTED;
                 /* Fall through */
@@ -2385,13 +2358,6 @@ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
 
         } while (sci->sc_stage.scnt != NILFS_ST_DONE);
 
-        /* Clearing sketch data */
-        if (has_sr && sci->sc_sketch_inode) {
-                if (i_size_read(sci->sc_sketch_inode) == 0)
-                        clear_bit(NILFS_I_DIRTY,
-                                  &NILFS_I(sci->sc_sketch_inode)->i_state);
-                i_size_write(sci->sc_sketch_inode, 0);
-        }
  out:
         nilfs_segctor_destroy_segment_buffers(sci);
         nilfs_segctor_check_out_files(sci, sbi);
@@ -2971,11 +2937,6 @@ static int nilfs_segctor_init(struct nilfs_sc_info *sci,
                               struct nilfs_recovery_info *ri)
 {
         int err;
-        struct inode *inode = nilfs_iget(sci->sc_super, NILFS_SKETCH_INO);
-
-        sci->sc_sketch_inode = IS_ERR(inode) ? NULL : inode;
-        if (sci->sc_sketch_inode)
-                i_size_write(sci->sc_sketch_inode, 0);
 
         sci->sc_seq_done = sci->sc_seq_request;
         if (ri)
@@ -2987,10 +2948,6 @@ static int nilfs_segctor_init(struct nilfs_sc_info *sci,
                 if (ri)
                         list_splice_init(&sci->sc_active_segments,
                                          ri->ri_used_segments.prev);
-                if (sci->sc_sketch_inode) {
-                        iput(sci->sc_sketch_inode);
-                        sci->sc_sketch_inode = NULL;
-                }
         }
         return err;
 }
@@ -3090,10 +3047,6 @@ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
 
         WARN_ON(!list_empty(&sci->sc_segbufs));
 
-        if (sci->sc_sketch_inode) {
-                iput(sci->sc_sketch_inode);
-                sci->sc_sketch_inode = NULL;
-        }
         down_write(&sbi->s_nilfs->ns_segctor_sem);
 
         kfree(sci);
diff --git a/fs/nilfs2/segment.h b/fs/nilfs2/segment.h
index 2dd39da9f386..fbd162d71707 100644
--- a/fs/nilfs2/segment.h
+++ b/fs/nilfs2/segment.h
@@ -108,7 +108,6 @@ struct nilfs_segsum_pointer {
  * @sc_nblk_this_inc: Number of blocks included in the current logical segment
  * @sc_seg_ctime: Creation time
  * @sc_flags: Internal flags
- * @sc_sketch_inode: Inode of the sketch file
  * @sc_state_lock: spinlock for sc_state and so on
  * @sc_state: Segctord state flags
  * @sc_flush_request: inode bitmap of metadata files to be flushed
@@ -158,13 +157,6 @@ struct nilfs_sc_info {
 
         unsigned long           sc_flags;
 
-        /*
-         * Pointer to an inode of the sketch.
-         * This pointer is kept only while it contains data.
-         * We protect it with a semaphore of the segment constructor.
-         */
-        struct inode           *sc_sketch_inode;
-
         spinlock_t              sc_state_lock;
         unsigned long           sc_state;
         unsigned long           sc_flush_request;