writeback: remove the always false bdi_cap_writeback_dirty() test
This is dead code because no bdi flush thread will be started for !bdi_cap_writeback_dirty bdi. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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@ -614,7 +614,6 @@ static void writeback_inodes_wb(struct bdi_writeback *wb,
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struct writeback_control *wbc)
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struct writeback_control *wbc)
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{
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{
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struct super_block *sb = wbc->sb, *pin_sb = NULL;
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struct super_block *sb = wbc->sb, *pin_sb = NULL;
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const int is_blkdev_sb = sb_is_blkdev_sb(sb);
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const unsigned long start = jiffies; /* livelock avoidance */
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const unsigned long start = jiffies; /* livelock avoidance */
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spin_lock(&inode_lock);
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spin_lock(&inode_lock);
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@ -635,23 +634,6 @@ static void writeback_inodes_wb(struct bdi_writeback *wb,
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continue;
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continue;
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}
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}
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if (!bdi_cap_writeback_dirty(wb->bdi)) {
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redirty_tail(inode);
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if (is_blkdev_sb) {
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/*
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* Dirty memory-backed blockdev: the ramdisk
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* driver does this. Skip just this inode
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*/
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continue;
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}
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/*
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* Dirty memory-backed inode against a filesystem other
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* than the kernel-internal bdev filesystem. Skip the
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* entire superblock.
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*/
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break;
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}
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if (inode->i_state & (I_NEW | I_WILL_FREE)) {
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if (inode->i_state & (I_NEW | I_WILL_FREE)) {
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requeue_io(inode);
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requeue_io(inode);
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continue;
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continue;
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