ext4: rename s_journal_flag_rwsem to s_writepages_rwsem

commit bbd55937de8f2754adc5792b0f8e5ff7d9c0420e upstream.

In preparation for making s_journal_flag_rwsem synchronize
ext4_writepages() with changes to both the EXTENTS and JOURNAL_DATA
flags (rather than just JOURNAL_DATA as it does currently), rename it to
s_writepages_rwsem.

Link: https://lore.kernel.org/r/20200219183047.47417-2-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index c8c6d48..7dd99ac 100644 (file)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1521,7 +1521,7 @@ struct ext4_sb_info {
        struct ratelimit_state s_msg_ratelimit_state;
 
        /* Barrier between changing inodes' journal flags and writepages ops. */
-       struct percpu_rw_semaphore s_journal_flag_rwsem;
+       struct percpu_rw_semaphore s_writepages_rwsem;
        struct dax_device *s_daxdev;
 };
 

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 6014fdf..23b4b17 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2730,7 +2730,7 @@ static int ext4_writepages(struct address_space *mapping,
        if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
                return -EIO;
 
-       percpu_down_read(&sbi->s_journal_flag_rwsem);
+       percpu_down_read(&sbi->s_writepages_rwsem);
        trace_ext4_writepages(inode, wbc);
 
        /*
@@ -2950,7 +2950,7 @@ unplug:
 out_writepages:
        trace_ext4_writepages_result(inode, wbc, ret,
                                     nr_to_write - wbc->nr_to_write);
-       percpu_up_read(&sbi->s_journal_flag_rwsem);
+       percpu_up_read(&sbi->s_writepages_rwsem);
        return ret;
 }
 
@@ -2965,13 +2965,13 @@ static int ext4_dax_writepages(struct address_space *mapping,
        if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
                return -EIO;
 
-       percpu_down_read(&sbi->s_journal_flag_rwsem);
+       percpu_down_read(&sbi->s_writepages_rwsem);
        trace_ext4_writepages(inode, wbc);
 
        ret = dax_writeback_mapping_range(mapping, inode->i_sb->s_bdev, wbc);
        trace_ext4_writepages_result(inode, wbc, ret,
                                     nr_to_write - wbc->nr_to_write);
-       percpu_up_read(&sbi->s_journal_flag_rwsem);
+       percpu_up_read(&sbi->s_writepages_rwsem);
        return ret;
 }
 
@@ -6207,7 +6207,7 @@ int ext4_change_inode_journal_flag(struct inode *inode, int val)
                }
        }
 
-       percpu_down_write(&sbi->s_journal_flag_rwsem);
+       percpu_down_write(&sbi->s_writepages_rwsem);
        jbd2_journal_lock_updates(journal);
 
        /*
@@ -6224,7 +6224,7 @@ int ext4_change_inode_journal_flag(struct inode *inode, int val)
                err = jbd2_journal_flush(journal);
                if (err < 0) {
                        jbd2_journal_unlock_updates(journal);
-                       percpu_up_write(&sbi->s_journal_flag_rwsem);
+                       percpu_up_write(&sbi->s_writepages_rwsem);
                        return err;
                }
                ext4_clear_inode_flag(inode, EXT4_INODE_JOURNAL_DATA);
@@ -6232,7 +6232,7 @@ int ext4_change_inode_journal_flag(struct inode *inode, int val)
        ext4_set_aops(inode);
 
        jbd2_journal_unlock_updates(journal);
-       percpu_up_write(&sbi->s_journal_flag_rwsem);
+       percpu_up_write(&sbi->s_writepages_rwsem);
 
        if (val)
                up_write(&EXT4_I(inode)->i_mmap_sem);

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 4a77d4d..cb79748 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1017,7 +1017,7 @@ static void ext4_put_super(struct super_block *sb)
        percpu_counter_destroy(&sbi->s_freeinodes_counter);
        percpu_counter_destroy(&sbi->s_dirs_counter);
        percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
-       percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
+       percpu_free_rwsem(&sbi->s_writepages_rwsem);
 #ifdef CONFIG_QUOTA
        for (i = 0; i < EXT4_MAXQUOTAS; i++)
                kfree(get_qf_name(sb, sbi, i));
@@ -4495,7 +4495,7 @@ no_journal:
                err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
                                          GFP_KERNEL);
        if (!err)
-               err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
+               err = percpu_init_rwsem(&sbi->s_writepages_rwsem);
 
        if (err) {
                ext4_msg(sb, KERN_ERR, "insufficient memory");
@@ -4595,7 +4595,7 @@ failed_mount6:
        percpu_counter_destroy(&sbi->s_freeinodes_counter);
        percpu_counter_destroy(&sbi->s_dirs_counter);
        percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
-       percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
+       percpu_free_rwsem(&sbi->s_writepages_rwsem);
 failed_mount5:
        ext4_ext_release(sb);
        ext4_release_system_zone(sb);