Btrfs: use i_version instead of our own sequence

We've been keeping around the inode sequence number in hopes that somebody
would use it, but nobody uses it and people actually use i_version which
serves the same purpose, so use i_version where we used the incore inode's
sequence number and that way the sequence is updated properly across the
board, and not just in file write.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>

7 files changed, 19 insertions, 10 deletions

diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 9b9b15fd5204..3771b8543a7e 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -83,9 +83,6 @@ struct btrfs_inode {
          */
         u64 generation;
 
-        /* sequence number for NFS changes */
-        u64 sequence;
-
         /*
          * transid of the trans_handle that last modified this inode
          */
diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
index 03e3748d84d0..bcd40c7109fa 100644
--- a/fs/btrfs/delayed-inode.c
+++ b/fs/btrfs/delayed-inode.c
@@ -1706,7 +1706,7 @@ static void fill_stack_inode_item(struct btrfs_trans_handle *trans,
         btrfs_set_stack_inode_nbytes(inode_item, inode_get_bytes(inode));
         btrfs_set_stack_inode_generation(inode_item,
                                          BTRFS_I(inode)->generation);
-        btrfs_set_stack_inode_sequence(inode_item, BTRFS_I(inode)->sequence);
+        btrfs_set_stack_inode_sequence(inode_item, inode->i_version);
         btrfs_set_stack_inode_transid(inode_item, trans->transid);
         btrfs_set_stack_inode_rdev(inode_item, inode->i_rdev);
         btrfs_set_stack_inode_flags(inode_item, BTRFS_I(inode)->flags);
@@ -1754,7 +1754,7 @@ int btrfs_fill_inode(struct inode *inode, u32 *rdev)
         set_nlink(inode, btrfs_stack_inode_nlink(inode_item));
         inode_set_bytes(inode, btrfs_stack_inode_nbytes(inode_item));
         BTRFS_I(inode)->generation = btrfs_stack_inode_generation(inode_item);
-        BTRFS_I(inode)->sequence = btrfs_stack_inode_sequence(inode_item);
+        inode->i_version = btrfs_stack_inode_sequence(inode_item);
         inode->i_rdev = 0;
         *rdev = btrfs_stack_inode_rdev(inode_item);
         BTRFS_I(inode)->flags = btrfs_stack_inode_flags(inode_item);
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 53bf2d764bbc..8aa8d7fe74d7 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1409,7 +1409,6 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
                 mutex_unlock(&inode->i_mutex);
                 goto out;
         }
-        BTRFS_I(inode)->sequence++;
 
         start_pos = round_down(pos, root->sectorsize);
         if (start_pos > i_size_read(inode)) {
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 61b16c641ce0..41a62e6954c2 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2510,7 +2510,7 @@ static void btrfs_read_locked_inode(struct inode *inode)
 
         inode_set_bytes(inode, btrfs_inode_nbytes(leaf, inode_item));
         BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item);
-        BTRFS_I(inode)->sequence = btrfs_inode_sequence(leaf, inode_item);
+        inode->i_version = btrfs_inode_sequence(leaf, inode_item);
         inode->i_generation = BTRFS_I(inode)->generation;
         inode->i_rdev = 0;
         rdev = btrfs_inode_rdev(leaf, inode_item);
@@ -2594,7 +2594,7 @@ static void fill_inode_item(struct btrfs_trans_handle *trans,
 
         btrfs_set_inode_nbytes(leaf, item, inode_get_bytes(inode));
         btrfs_set_inode_generation(leaf, item, BTRFS_I(inode)->generation);
-        btrfs_set_inode_sequence(leaf, item, BTRFS_I(inode)->sequence);
+        btrfs_set_inode_sequence(leaf, item, inode->i_version);
         btrfs_set_inode_transid(leaf, item, trans->transid);
         btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
         btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
@@ -2752,6 +2752,8 @@ err:
                 goto out;
 
         btrfs_i_size_write(dir, dir->i_size - name_len * 2);
+        inode_inc_iversion(inode);
+        inode_inc_iversion(dir);
         inode->i_ctime = dir->i_mtime = dir->i_ctime = CURRENT_TIME;
         btrfs_update_inode(trans, root, dir);
 out:
@@ -3089,6 +3091,7 @@ int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
         }
 
         btrfs_i_size_write(dir, dir->i_size - name_len * 2);
+        inode_inc_iversion(dir);
         dir->i_mtime = dir->i_ctime = CURRENT_TIME;
         ret = btrfs_update_inode(trans, root, dir);
         if (ret)
@@ -3638,6 +3641,7 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
 
         if (attr->ia_valid) {
                 setattr_copy(inode, attr);
+                inode_inc_iversion(inode);
                 err = btrfs_dirty_inode(inode);
 
                 if (!err && attr->ia_valid & ATTR_MODE)
@@ -4730,6 +4734,7 @@ int btrfs_add_link(struct btrfs_trans_handle *trans,
 
         btrfs_i_size_write(parent_inode, parent_inode->i_size +
                            name_len * 2);
+        inode_inc_iversion(parent_inode);
         parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
         ret = btrfs_update_inode(trans, root, parent_inode);
         if (ret)
@@ -4937,6 +4942,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
         }
 
         btrfs_inc_nlink(inode);
+        inode_inc_iversion(inode);
         inode->i_ctime = CURRENT_TIME;
         ihold(inode);
 
@@ -6894,7 +6900,6 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
         ei->root = NULL;
         ei->space_info = NULL;
         ei->generation = 0;
-        ei->sequence = 0;
         ei->last_trans = 0;
         ei->last_sub_trans = 0;
         ei->logged_trans = 0;
@@ -7193,6 +7198,9 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
         if (new_inode && new_inode->i_size && S_ISREG(old_inode->i_mode))
                 btrfs_add_ordered_operation(trans, root, old_inode);
 
+        inode_inc_iversion(old_dir);
+        inode_inc_iversion(new_dir);
+        inode_inc_iversion(old_inode);
         old_dir->i_ctime = old_dir->i_mtime = ctime;
         new_dir->i_ctime = new_dir->i_mtime = ctime;
         old_inode->i_ctime = ctime;
@@ -7219,6 +7227,7 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
         }
 
         if (new_inode) {
+                inode_inc_iversion(new_inode);
                 new_inode->i_ctime = CURRENT_TIME;
                 if (unlikely(btrfs_ino(new_inode) ==
                              BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) {
@@ -7490,6 +7499,7 @@ static int __btrfs_prealloc_file_range(struct inode *inode, int mode,
                 cur_offset += ins.offset;
                 *alloc_hint = ins.objectid + ins.offset;
 
+                inode_inc_iversion(inode);
                 inode->i_ctime = CURRENT_TIME;
                 BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC;
                 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 14f8e1faa46e..fccde7402cfe 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -261,6 +261,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
         }
 
         btrfs_update_iflags(inode);
+        inode_inc_iversion(inode);
         inode->i_ctime = CURRENT_TIME;
         ret = btrfs_update_inode(trans, root, inode);
 
@@ -2622,6 +2623,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
                         btrfs_mark_buffer_dirty(leaf);
                         btrfs_release_path(path);
 
+                        inode_inc_iversion(inode);
                         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 
                         /*
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index c5f8fca4195f..bd6d143cea85 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -769,7 +769,7 @@ static int btrfs_fill_super(struct super_block *sb,
 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
         sb->s_flags |= MS_POSIXACL;
 #endif
-
+        sb->s_flags |= MS_I_VERSION;
         err = open_ctree(sb, fs_devices, (char *)data);
         if (err) {
                 printk("btrfs: open_ctree failed\n");
diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index e7a5659087e6..3f4e2d69e83a 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -196,6 +196,7 @@ int __btrfs_setxattr(struct btrfs_trans_handle *trans,
         if (ret)
                 goto out;
 
+        inode_inc_iversion(inode);
         inode->i_ctime = CURRENT_TIME;
         ret = btrfs_update_inode(trans, root, inode);
         BUG_ON(ret);