diff options
| -rw-r--r-- | fs/block_dev.c | 4 | ||||
| -rw-r--r-- | fs/fs-writeback.c | 76 | ||||
| -rw-r--r-- | fs/inode.c | 12 | ||||
| -rw-r--r-- | fs/internal.h | 5 | ||||
| -rw-r--r-- | include/linux/writeback.h | 1 | ||||
| -rw-r--r-- | mm/backing-dev.c | 8 | ||||
| -rw-r--r-- | mm/filemap.c | 8 | ||||
| -rw-r--r-- | mm/rmap.c | 4 |
8 files changed, 70 insertions, 48 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c index bc39b18..2bbc0e6 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -55,13 +55,13 @@ EXPORT_SYMBOL(I_BDEV); static void bdev_inode_switch_bdi(struct inode *inode, struct backing_dev_info *dst) { - spin_lock(&inode_lock); + spin_lock(&inode_wb_list_lock); spin_lock(&inode->i_lock); inode->i_data.backing_dev_info = dst; if (inode->i_state & I_DIRTY) list_move(&inode->i_wb_list, &dst->wb.b_dirty); spin_unlock(&inode->i_lock); - spin_unlock(&inode_lock); + spin_unlock(&inode_wb_list_lock); } static sector_t max_block(struct block_device *bdev) diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 5de56a2..ed80065 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -176,6 +176,17 @@ void bdi_start_background_writeback(struct backing_dev_info *bdi) } /* + * Remove the inode from the writeback list it is on. + */ +void inode_wb_list_del(struct inode *inode) +{ + spin_lock(&inode_wb_list_lock); + list_del_init(&inode->i_wb_list); + spin_unlock(&inode_wb_list_lock); +} + + +/* * Redirty an inode: set its when-it-was dirtied timestamp and move it to the * furthest end of its superblock's dirty-inode list. * @@ -188,6 +199,7 @@ static void redirty_tail(struct inode *inode) { struct bdi_writeback *wb = &inode_to_bdi(inode)->wb; + assert_spin_locked(&inode_wb_list_lock); if (!list_empty(&wb->b_dirty)) { struct inode *tail; @@ -205,14 +217,17 @@ static void requeue_io(struct inode *inode) { struct bdi_writeback *wb = &inode_to_bdi(inode)->wb; + assert_spin_locked(&inode_wb_list_lock); list_move(&inode->i_wb_list, &wb->b_more_io); } static void inode_sync_complete(struct inode *inode) { /* - * Prevent speculative execution through spin_unlock(&inode_lock); + * Prevent speculative execution through + * spin_unlock(&inode_wb_list_lock); */ + smp_mb(); wake_up_bit(&inode->i_state, __I_SYNC); } @@ -286,6 +301,7 @@ static void move_expired_inodes(struct list_head *delaying_queue, */ static void queue_io(struct bdi_writeback *wb, unsigned long *older_than_this) { + assert_spin_locked(&inode_wb_list_lock); list_splice_init(&wb->b_more_io, &wb->b_io); move_expired_inodes(&wb->b_dirty, &wb->b_io, older_than_this); } @@ -308,25 +324,23 @@ static void inode_wait_for_writeback(struct inode *inode) wqh = bit_waitqueue(&inode->i_state, __I_SYNC); while (inode->i_state & I_SYNC) { spin_unlock(&inode->i_lock); - spin_unlock(&inode_lock); + spin_unlock(&inode_wb_list_lock); __wait_on_bit(wqh, &wq, inode_wait, TASK_UNINTERRUPTIBLE); - spin_lock(&inode_lock); + spin_lock(&inode_wb_list_lock); spin_lock(&inode->i_lock); } } /* - * Write out an inode's dirty pages. Called under inode_lock. Either the - * caller has ref on the inode (either via __iget or via syscall against an fd) - * or the inode has I_WILL_FREE set (via generic_forget_inode) + * Write out an inode's dirty pages. Called under inode_wb_list_lock. Either + * the caller has an active reference on the inode or the inode has I_WILL_FREE + * set. * * If `wait' is set, wait on the writeout. * * The whole writeout design is quite complex and fragile. We want to avoid * starvation of particular inodes when others are being redirtied, prevent * livelocks, etc. - * - * Called under inode_lock. */ static int writeback_single_inode(struct inode *inode, struct writeback_control *wbc) @@ -368,7 +382,7 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc) inode->i_state |= I_SYNC; inode->i_state &= ~I_DIRTY_PAGES; spin_unlock(&inode->i_lock); - spin_unlock(&inode_lock); + spin_unlock(&inode_wb_list_lock); ret = do_writepages(mapping, wbc); @@ -388,12 +402,10 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc) * due to delalloc, clear dirty metadata flags right before * write_inode() */ - spin_lock(&inode_lock); spin_lock(&inode->i_lock); dirty = inode->i_state & I_DIRTY; inode->i_state &= ~(I_DIRTY_SYNC | I_DIRTY_DATASYNC); spin_unlock(&inode->i_lock); - spin_unlock(&inode_lock); /* Don't write the inode if only I_DIRTY_PAGES was set */ if (dirty & (I_DIRTY_SYNC | I_DIRTY_DATASYNC)) { int err = write_inode(inode, wbc); @@ -401,7 +413,7 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc) ret = err; } - spin_lock(&inode_lock); + spin_lock(&inode_wb_list_lock); spin_lock(&inode->i_lock); inode->i_state &= ~I_SYNC; if (!(inode->i_state & I_FREEING)) { @@ -543,10 +555,10 @@ static int writeback_sb_inodes(struct super_block *sb, struct bdi_writeback *wb, */ redirty_tail(inode); } - spin_unlock(&inode_lock); + spin_unlock(&inode_wb_list_lock); iput(inode); cond_resched(); - spin_lock(&inode_lock); + spin_lock(&inode_wb_list_lock); if (wbc->nr_to_write <= 0) { wbc->more_io = 1; return 1; @@ -565,7 +577,7 @@ void writeback_inodes_wb(struct bdi_writeback *wb, if (!wbc->wb_start) wbc->wb_start = jiffies; /* livelock avoidance */ - spin_lock(&inode_lock); + spin_lock(&inode_wb_list_lock); if (!wbc->for_kupdate || list_empty(&wb->b_io)) queue_io(wb, wbc->older_than_this); @@ -583,7 +595,7 @@ void writeback_inodes_wb(struct bdi_writeback *wb, if (ret) break; } - spin_unlock(&inode_lock); + spin_unlock(&inode_wb_list_lock); /* Leave any unwritten inodes on b_io */ } @@ -592,11 +604,11 @@ static void __writeback_inodes_sb(struct super_block *sb, { WARN_ON(!rwsem_is_locked(&sb->s_umount)); - spin_lock(&inode_lock); + spin_lock(&inode_wb_list_lock); if (!wbc->for_kupdate || list_empty(&wb->b_io)) queue_io(wb, wbc->older_than_this); writeback_sb_inodes(sb, wb, wbc, true); - spin_unlock(&inode_lock); + spin_unlock(&inode_wb_list_lock); } /* @@ -735,7 +747,7 @@ static long wb_writeback(struct bdi_writeback *wb, * become available for writeback. Otherwise * we'll just busyloop. */ - spin_lock(&inode_lock); + spin_lock(&inode_wb_list_lock); if (!list_empty(&wb->b_more_io)) { inode = wb_inode(wb->b_more_io.prev); trace_wbc_writeback_wait(&wbc, wb->bdi); @@ -743,7 +755,7 @@ static long wb_writeback(struct bdi_writeback *wb, inode_wait_for_writeback(inode); spin_unlock(&inode->i_lock); } - spin_unlock(&inode_lock); + spin_unlock(&inode_wb_list_lock); } return wrote; @@ -1009,7 +1021,6 @@ void __mark_inode_dirty(struct inode *inode, int flags) { struct super_block *sb = inode->i_sb; struct backing_dev_info *bdi = NULL; - bool wakeup_bdi = false; /* * Don't do this for I_DIRTY_PAGES - that doesn't actually @@ -1033,7 +1044,6 @@ void __mark_inode_dirty(struct inode *inode, int flags) if (unlikely(block_dump)) block_dump___mark_inode_dirty(inode); - spin_lock(&inode_lock); spin_lock(&inode->i_lock); if ((inode->i_state & flags) != flags) { const int was_dirty = inode->i_state & I_DIRTY; @@ -1059,12 +1069,12 @@ void __mark_inode_dirty(struct inode *inode, int flags) if (inode->i_state & I_FREEING) goto out_unlock_inode; - spin_unlock(&inode->i_lock); /* * If the inode was already on b_dirty/b_io/b_more_io, don't * reposition it (that would break b_dirty time-ordering). */ if (!was_dirty) { + bool wakeup_bdi = false; bdi = inode_to_bdi(inode); if (bdi_cap_writeback_dirty(bdi)) { @@ -1081,18 +1091,20 @@ void __mark_inode_dirty(struct inode *inode, int flags) wakeup_bdi = true; } + spin_unlock(&inode->i_lock); + spin_lock(&inode_wb_list_lock); inode->dirtied_when = jiffies; list_move(&inode->i_wb_list, &bdi->wb.b_dirty); + spin_unlock(&inode_wb_list_lock); + + if (wakeup_bdi) + bdi_wakeup_thread_delayed(bdi); + return; } - goto out; } out_unlock_inode: spin_unlock(&inode->i_lock); -out: - spin_unlock(&inode_lock); - if (wakeup_bdi) - bdi_wakeup_thread_delayed(bdi); } EXPORT_SYMBOL(__mark_inode_dirty); @@ -1296,9 +1308,9 @@ int write_inode_now(struct inode *inode, int sync) wbc.nr_to_write = 0; might_sleep(); - spin_lock(&inode_lock); + spin_lock(&inode_wb_list_lock); ret = writeback_single_inode(inode, &wbc); - spin_unlock(&inode_lock); + spin_unlock(&inode_wb_list_lock); if (sync) inode_sync_wait(inode); return ret; @@ -1320,9 +1332,9 @@ int sync_inode(struct inode *inode, struct writeback_control *wbc) { int ret; - spin_lock(&inode_lock); + spin_lock(&inode_wb_list_lock); ret = writeback_single_inode(inode, wbc); - spin_unlock(&inode_lock); + spin_unlock(&inode_wb_list_lock); return ret; } EXPORT_SYMBOL(sync_inode); @@ -26,6 +26,7 @@ #include <linux/posix_acl.h> #include <linux/ima.h> #include <linux/cred.h> +#include "internal.h" /* * inode locking rules. @@ -36,6 +37,8 @@ * inode_lru, inode->i_lru * inode_sb_list_lock protects: * sb->s_inodes, inode->i_sb_list + * inode_wb_list_lock protects: + * bdi->wb.b_{dirty,io,more_io}, inode->i_wb_list * * Lock ordering: * inode_lock @@ -44,6 +47,9 @@ * inode_sb_list_lock * inode->i_lock * inode_lru_lock + * + * inode_wb_list_lock + * inode->i_lock */ /* @@ -105,6 +111,7 @@ static struct hlist_head *inode_hashtable __read_mostly; DEFINE_SPINLOCK(inode_lock); __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_sb_list_lock); +__cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_wb_list_lock); /* * iprune_sem provides exclusion between the icache shrinking and the @@ -483,10 +490,7 @@ static void evict(struct inode *inode) BUG_ON(!(inode->i_state & I_FREEING)); BUG_ON(!list_empty(&inode->i_lru)); - spin_lock(&inode_lock); - list_del_init(&inode->i_wb_list); - spin_unlock(&inode_lock); - + inode_wb_list_del(inode); inode_sb_list_del(inode); if (op->evict_inode) { diff --git a/fs/internal.h b/fs/internal.h index 7013ae0..b29c46e 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -127,6 +127,11 @@ extern long do_handle_open(int mountdirfd, */ extern spinlock_t inode_sb_list_lock; +/* + * fs-writeback.c + */ +extern void inode_wb_list_del(struct inode *inode); + extern int get_nr_dirty_inodes(void); extern void evict_inodes(struct super_block *); extern int invalidate_inodes(struct super_block *, bool); diff --git a/include/linux/writeback.h b/include/linux/writeback.h index 0ead399..3f5fee7 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -10,6 +10,7 @@ struct backing_dev_info; extern spinlock_t inode_lock; +extern spinlock_t inode_wb_list_lock; /* * fs/fs-writeback.c diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 027100d..4b3e9f1 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -73,14 +73,14 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v) struct inode *inode; nr_wb = nr_dirty = nr_io = nr_more_io = 0; - spin_lock(&inode_lock); + spin_lock(&inode_wb_list_lock); list_for_each_entry(inode, &wb->b_dirty, i_wb_list) nr_dirty++; list_for_each_entry(inode, &wb->b_io, i_wb_list) nr_io++; list_for_each_entry(inode, &wb->b_more_io, i_wb_list) nr_more_io++; - spin_unlock(&inode_lock); + spin_unlock(&inode_wb_list_lock); global_dirty_limits(&background_thresh, &dirty_thresh); bdi_thresh = bdi_dirty_limit(bdi, dirty_thresh); @@ -682,11 +682,11 @@ void bdi_destroy(struct backing_dev_info *bdi) if (bdi_has_dirty_io(bdi)) { struct bdi_writeback *dst = &default_backing_dev_info.wb; - spin_lock(&inode_lock); + spin_lock(&inode_wb_list_lock); list_splice(&bdi->wb.b_dirty, &dst->b_dirty); list_splice(&bdi->wb.b_io, &dst->b_io); list_splice(&bdi->wb.b_more_io, &dst->b_more_io); - spin_unlock(&inode_lock); + spin_unlock(&inode_wb_list_lock); } bdi_unregister(bdi); diff --git a/mm/filemap.c b/mm/filemap.c index 499e9aa..d8b34d1 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -80,8 +80,8 @@ * ->i_mutex * ->i_alloc_sem (various) * - * ->inode_lock - * ->sb_lock (fs/fs-writeback.c) + * inode_wb_list_lock + * sb_lock (fs/fs-writeback.c) * ->mapping->tree_lock (__sync_single_inode) * * ->i_mmap_lock @@ -98,9 +98,9 @@ * ->zone.lru_lock (check_pte_range->isolate_lru_page) * ->private_lock (page_remove_rmap->set_page_dirty) * ->tree_lock (page_remove_rmap->set_page_dirty) - * ->inode_lock (page_remove_rmap->set_page_dirty) + * inode_wb_list_lock (page_remove_rmap->set_page_dirty) * ->inode->i_lock (page_remove_rmap->set_page_dirty) - * ->inode_lock (zap_pte_range->set_page_dirty) + * inode_wb_list_lock (zap_pte_range->set_page_dirty) * ->inode->i_lock (zap_pte_range->set_page_dirty) * ->private_lock (zap_pte_range->__set_page_dirty_buffers) * @@ -31,12 +31,12 @@ * swap_lock (in swap_duplicate, swap_info_get) * mmlist_lock (in mmput, drain_mmlist and others) * mapping->private_lock (in __set_page_dirty_buffers) - * inode_lock (in set_page_dirty's __mark_inode_dirty) * inode->i_lock (in set_page_dirty's __mark_inode_dirty) + * inode_wb_list_lock (in set_page_dirty's __mark_inode_dirty) * sb_lock (within inode_lock in fs/fs-writeback.c) * mapping->tree_lock (widely used, in set_page_dirty, * in arch-dependent flush_dcache_mmap_lock, - * within inode_lock in __sync_single_inode) + * within inode_wb_list_lock in __sync_single_inode) * * (code doesn't rely on that order so it could be switched around) * ->tasklist_lock |
