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7ef0d7377c
There was a report of a data corruption http://lkml.org/lkml/2008/11/14/121. There is a script included to reproduce the problem. During testing, I encountered a number of strange things with ext3, so I tried ext2 to attempt to reduce complexity of the problem. I found that fsstress would quickly hang in wait_on_inode, waiting for I_LOCK to be cleared, even though instrumentation showed that unlock_new_inode had already been called for that inode. This points to memory scribble, or synchronisation problme. i_state of I_NEW inodes is not protected by inode_lock because other processes are not supposed to touch them until I_LOCK (and I_NEW) is cleared. Adding WARN_ON(inode->i_state & I_NEW) to sites where we modify i_state revealed that generic_sync_sb_inodes is picking up new inodes from the inode lists and passing them to __writeback_single_inode without waiting for I_NEW. Subsequently modifying i_state causes corruption. In my case it would look like this: CPU0 CPU1 unlock_new_inode() __sync_single_inode() reg <- inode->i_state reg -> reg & ~(I_LOCK|I_NEW) reg <- inode->i_state reg -> inode->i_state reg -> reg | I_SYNC reg -> inode->i_state Non-atomic RMW on CPU1 overwrites CPU0 store and sets I_LOCK|I_NEW again. Fix for this is rather than wait for I_NEW inodes, just skip over them: inodes concurrently being created are not subject to data integrity operations, and should not significantly contribute to dirty memory either. After this change, I'm unable to reproduce any of the added warnings or hangs after ~1hour of running. Previously, the new warnings would start immediately and hang would happen in under 5 minutes. I'm also testing on ext3 now, and so far no problems there either. I don't know whether this fixes the problem reported above, but it fixes a real problem for me. Cc: "Jorge Boncompte [DTI2]" <jorge@dti2.net> Reported-by: Adrian Hunter <ext-adrian.hunter@nokia.com> Cc: Jan Kara <jack@suse.cz> Cc: <stable@kernel.org> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
819 lines
23 KiB
C
819 lines
23 KiB
C
/*
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* fs/fs-writeback.c
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*
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* Copyright (C) 2002, Linus Torvalds.
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*
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* Contains all the functions related to writing back and waiting
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* upon dirty inodes against superblocks, and writing back dirty
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* pages against inodes. ie: data writeback. Writeout of the
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* inode itself is not handled here.
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*
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* 10Apr2002 Andrew Morton
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* Split out of fs/inode.c
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* Additions for address_space-based writeback
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/writeback.h>
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#include <linux/blkdev.h>
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#include <linux/backing-dev.h>
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#include <linux/buffer_head.h>
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#include "internal.h"
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/**
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* writeback_acquire - attempt to get exclusive writeback access to a device
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* @bdi: the device's backing_dev_info structure
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*
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* It is a waste of resources to have more than one pdflush thread blocked on
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* a single request queue. Exclusion at the request_queue level is obtained
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* via a flag in the request_queue's backing_dev_info.state.
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*
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* Non-request_queue-backed address_spaces will share default_backing_dev_info,
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* unless they implement their own. Which is somewhat inefficient, as this
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* may prevent concurrent writeback against multiple devices.
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*/
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static int writeback_acquire(struct backing_dev_info *bdi)
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{
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return !test_and_set_bit(BDI_pdflush, &bdi->state);
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}
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/**
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* writeback_in_progress - determine whether there is writeback in progress
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* @bdi: the device's backing_dev_info structure.
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*
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* Determine whether there is writeback in progress against a backing device.
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*/
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int writeback_in_progress(struct backing_dev_info *bdi)
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{
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return test_bit(BDI_pdflush, &bdi->state);
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}
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/**
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* writeback_release - relinquish exclusive writeback access against a device.
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* @bdi: the device's backing_dev_info structure
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*/
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static void writeback_release(struct backing_dev_info *bdi)
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{
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BUG_ON(!writeback_in_progress(bdi));
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clear_bit(BDI_pdflush, &bdi->state);
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}
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/**
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* __mark_inode_dirty - internal function
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* @inode: inode to mark
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* @flags: what kind of dirty (i.e. I_DIRTY_SYNC)
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* Mark an inode as dirty. Callers should use mark_inode_dirty or
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* mark_inode_dirty_sync.
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*
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* Put the inode on the super block's dirty list.
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*
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* CAREFUL! We mark it dirty unconditionally, but move it onto the
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* dirty list only if it is hashed or if it refers to a blockdev.
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* If it was not hashed, it will never be added to the dirty list
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* even if it is later hashed, as it will have been marked dirty already.
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*
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* In short, make sure you hash any inodes _before_ you start marking
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* them dirty.
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*
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* This function *must* be atomic for the I_DIRTY_PAGES case -
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* set_page_dirty() is called under spinlock in several places.
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*
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* Note that for blockdevs, inode->dirtied_when represents the dirtying time of
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* the block-special inode (/dev/hda1) itself. And the ->dirtied_when field of
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* the kernel-internal blockdev inode represents the dirtying time of the
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* blockdev's pages. This is why for I_DIRTY_PAGES we always use
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* page->mapping->host, so the page-dirtying time is recorded in the internal
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* blockdev inode.
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*/
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void __mark_inode_dirty(struct inode *inode, int flags)
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{
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struct super_block *sb = inode->i_sb;
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/*
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* Don't do this for I_DIRTY_PAGES - that doesn't actually
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* dirty the inode itself
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*/
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if (flags & (I_DIRTY_SYNC | I_DIRTY_DATASYNC)) {
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if (sb->s_op->dirty_inode)
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sb->s_op->dirty_inode(inode);
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}
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/*
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* make sure that changes are seen by all cpus before we test i_state
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* -- mikulas
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*/
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smp_mb();
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/* avoid the locking if we can */
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if ((inode->i_state & flags) == flags)
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return;
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if (unlikely(block_dump)) {
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struct dentry *dentry = NULL;
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const char *name = "?";
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if (!list_empty(&inode->i_dentry)) {
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dentry = list_entry(inode->i_dentry.next,
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struct dentry, d_alias);
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if (dentry && dentry->d_name.name)
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name = (const char *) dentry->d_name.name;
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}
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if (inode->i_ino || strcmp(inode->i_sb->s_id, "bdev"))
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printk(KERN_DEBUG
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"%s(%d): dirtied inode %lu (%s) on %s\n",
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current->comm, task_pid_nr(current), inode->i_ino,
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name, inode->i_sb->s_id);
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}
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spin_lock(&inode_lock);
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if ((inode->i_state & flags) != flags) {
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const int was_dirty = inode->i_state & I_DIRTY;
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inode->i_state |= flags;
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/*
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* If the inode is being synced, just update its dirty state.
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* The unlocker will place the inode on the appropriate
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* superblock list, based upon its state.
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*/
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if (inode->i_state & I_SYNC)
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goto out;
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/*
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* Only add valid (hashed) inodes to the superblock's
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* dirty list. Add blockdev inodes as well.
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*/
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if (!S_ISBLK(inode->i_mode)) {
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if (hlist_unhashed(&inode->i_hash))
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goto out;
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}
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if (inode->i_state & (I_FREEING|I_CLEAR))
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goto out;
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/*
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* If the inode was already on s_dirty/s_io/s_more_io, don't
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* reposition it (that would break s_dirty time-ordering).
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*/
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if (!was_dirty) {
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inode->dirtied_when = jiffies;
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list_move(&inode->i_list, &sb->s_dirty);
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}
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}
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out:
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spin_unlock(&inode_lock);
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}
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EXPORT_SYMBOL(__mark_inode_dirty);
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static int write_inode(struct inode *inode, int sync)
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{
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if (inode->i_sb->s_op->write_inode && !is_bad_inode(inode))
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return inode->i_sb->s_op->write_inode(inode, sync);
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return 0;
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}
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/*
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* Redirty an inode: set its when-it-was dirtied timestamp and move it to the
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* furthest end of its superblock's dirty-inode list.
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*
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* Before stamping the inode's ->dirtied_when, we check to see whether it is
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* already the most-recently-dirtied inode on the s_dirty list. If that is
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* the case then the inode must have been redirtied while it was being written
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* out and we don't reset its dirtied_when.
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*/
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static void redirty_tail(struct inode *inode)
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{
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struct super_block *sb = inode->i_sb;
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if (!list_empty(&sb->s_dirty)) {
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struct inode *tail_inode;
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tail_inode = list_entry(sb->s_dirty.next, struct inode, i_list);
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if (!time_after_eq(inode->dirtied_when,
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tail_inode->dirtied_when))
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inode->dirtied_when = jiffies;
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}
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list_move(&inode->i_list, &sb->s_dirty);
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}
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/*
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* requeue inode for re-scanning after sb->s_io list is exhausted.
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*/
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static void requeue_io(struct inode *inode)
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{
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list_move(&inode->i_list, &inode->i_sb->s_more_io);
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}
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static void inode_sync_complete(struct inode *inode)
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{
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/*
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* Prevent speculative execution through spin_unlock(&inode_lock);
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*/
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smp_mb();
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wake_up_bit(&inode->i_state, __I_SYNC);
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}
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/*
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* Move expired dirty inodes from @delaying_queue to @dispatch_queue.
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*/
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static void move_expired_inodes(struct list_head *delaying_queue,
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struct list_head *dispatch_queue,
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unsigned long *older_than_this)
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{
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while (!list_empty(delaying_queue)) {
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struct inode *inode = list_entry(delaying_queue->prev,
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struct inode, i_list);
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if (older_than_this &&
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time_after(inode->dirtied_when, *older_than_this))
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break;
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list_move(&inode->i_list, dispatch_queue);
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}
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}
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/*
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* Queue all expired dirty inodes for io, eldest first.
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*/
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static void queue_io(struct super_block *sb,
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unsigned long *older_than_this)
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{
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list_splice_init(&sb->s_more_io, sb->s_io.prev);
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move_expired_inodes(&sb->s_dirty, &sb->s_io, older_than_this);
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}
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int sb_has_dirty_inodes(struct super_block *sb)
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{
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return !list_empty(&sb->s_dirty) ||
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!list_empty(&sb->s_io) ||
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!list_empty(&sb->s_more_io);
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}
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EXPORT_SYMBOL(sb_has_dirty_inodes);
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/*
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* Write a single inode's dirty pages and inode data out to disk.
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* If `wait' is set, wait on the writeout.
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*
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* The whole writeout design is quite complex and fragile. We want to avoid
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* starvation of particular inodes when others are being redirtied, prevent
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* livelocks, etc.
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*
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* Called under inode_lock.
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*/
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static int
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__sync_single_inode(struct inode *inode, struct writeback_control *wbc)
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{
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unsigned dirty;
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struct address_space *mapping = inode->i_mapping;
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int wait = wbc->sync_mode == WB_SYNC_ALL;
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int ret;
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BUG_ON(inode->i_state & I_SYNC);
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WARN_ON(inode->i_state & I_NEW);
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/* Set I_SYNC, reset I_DIRTY */
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dirty = inode->i_state & I_DIRTY;
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inode->i_state |= I_SYNC;
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inode->i_state &= ~I_DIRTY;
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spin_unlock(&inode_lock);
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ret = do_writepages(mapping, wbc);
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/* Don't write the inode if only I_DIRTY_PAGES was set */
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if (dirty & (I_DIRTY_SYNC | I_DIRTY_DATASYNC)) {
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int err = write_inode(inode, wait);
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if (ret == 0)
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ret = err;
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}
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if (wait) {
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int err = filemap_fdatawait(mapping);
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if (ret == 0)
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ret = err;
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}
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spin_lock(&inode_lock);
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WARN_ON(inode->i_state & I_NEW);
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inode->i_state &= ~I_SYNC;
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if (!(inode->i_state & I_FREEING)) {
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if (!(inode->i_state & I_DIRTY) &&
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mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
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/*
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* We didn't write back all the pages. nfs_writepages()
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* sometimes bales out without doing anything. Redirty
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* the inode; Move it from s_io onto s_more_io/s_dirty.
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*/
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/*
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* akpm: if the caller was the kupdate function we put
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* this inode at the head of s_dirty so it gets first
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* consideration. Otherwise, move it to the tail, for
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* the reasons described there. I'm not really sure
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* how much sense this makes. Presumably I had a good
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* reasons for doing it this way, and I'd rather not
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* muck with it at present.
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*/
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if (wbc->for_kupdate) {
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/*
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* For the kupdate function we move the inode
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* to s_more_io so it will get more writeout as
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* soon as the queue becomes uncongested.
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*/
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inode->i_state |= I_DIRTY_PAGES;
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if (wbc->nr_to_write <= 0) {
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/*
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* slice used up: queue for next turn
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*/
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requeue_io(inode);
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} else {
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/*
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* somehow blocked: retry later
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*/
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redirty_tail(inode);
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}
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} else {
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/*
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* Otherwise fully redirty the inode so that
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* other inodes on this superblock will get some
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* writeout. Otherwise heavy writing to one
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* file would indefinitely suspend writeout of
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* all the other files.
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*/
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inode->i_state |= I_DIRTY_PAGES;
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redirty_tail(inode);
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}
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} else if (inode->i_state & I_DIRTY) {
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/*
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* Someone redirtied the inode while were writing back
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* the pages.
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*/
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redirty_tail(inode);
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} else if (atomic_read(&inode->i_count)) {
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/*
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* The inode is clean, inuse
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*/
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list_move(&inode->i_list, &inode_in_use);
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} else {
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/*
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* The inode is clean, unused
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*/
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list_move(&inode->i_list, &inode_unused);
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}
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}
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inode_sync_complete(inode);
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return ret;
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}
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/*
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* Write out an inode's dirty pages. Called under inode_lock. Either the
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* caller has ref on the inode (either via __iget or via syscall against an fd)
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* or the inode has I_WILL_FREE set (via generic_forget_inode)
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*/
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static int
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__writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
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{
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wait_queue_head_t *wqh;
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if (!atomic_read(&inode->i_count))
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WARN_ON(!(inode->i_state & (I_WILL_FREE|I_FREEING)));
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else
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WARN_ON(inode->i_state & I_WILL_FREE);
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if ((wbc->sync_mode != WB_SYNC_ALL) && (inode->i_state & I_SYNC)) {
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/*
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* We're skipping this inode because it's locked, and we're not
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* doing writeback-for-data-integrity. Move it to s_more_io so
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* that writeback can proceed with the other inodes on s_io.
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* We'll have another go at writing back this inode when we
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* completed a full scan of s_io.
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*/
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requeue_io(inode);
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return 0;
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}
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/*
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* It's a data-integrity sync. We must wait.
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*/
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if (inode->i_state & I_SYNC) {
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DEFINE_WAIT_BIT(wq, &inode->i_state, __I_SYNC);
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wqh = bit_waitqueue(&inode->i_state, __I_SYNC);
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do {
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spin_unlock(&inode_lock);
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__wait_on_bit(wqh, &wq, inode_wait,
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TASK_UNINTERRUPTIBLE);
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spin_lock(&inode_lock);
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} while (inode->i_state & I_SYNC);
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}
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return __sync_single_inode(inode, wbc);
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}
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|
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/*
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* Write out a superblock's list of dirty inodes. A wait will be performed
|
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* upon no inodes, all inodes or the final one, depending upon sync_mode.
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*
|
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* If older_than_this is non-NULL, then only write out inodes which
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* had their first dirtying at a time earlier than *older_than_this.
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*
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* If we're a pdlfush thread, then implement pdflush collision avoidance
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* against the entire list.
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*
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* If `bdi' is non-zero then we're being asked to writeback a specific queue.
|
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* This function assumes that the blockdev superblock's inodes are backed by
|
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* a variety of queues, so all inodes are searched. For other superblocks,
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* assume that all inodes are backed by the same queue.
|
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*
|
|
* FIXME: this linear search could get expensive with many fileystems. But
|
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* how to fix? We need to go from an address_space to all inodes which share
|
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* a queue with that address_space. (Easy: have a global "dirty superblocks"
|
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* list).
|
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*
|
|
* The inodes to be written are parked on sb->s_io. They are moved back onto
|
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* sb->s_dirty as they are selected for writing. This way, none can be missed
|
|
* on the writer throttling path, and we get decent balancing between many
|
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* throttled threads: we don't want them all piling up on inode_sync_wait.
|
|
*/
|
|
void generic_sync_sb_inodes(struct super_block *sb,
|
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struct writeback_control *wbc)
|
|
{
|
|
const unsigned long start = jiffies; /* livelock avoidance */
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int sync = wbc->sync_mode == WB_SYNC_ALL;
|
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|
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spin_lock(&inode_lock);
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if (!wbc->for_kupdate || list_empty(&sb->s_io))
|
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queue_io(sb, wbc->older_than_this);
|
|
|
|
while (!list_empty(&sb->s_io)) {
|
|
struct inode *inode = list_entry(sb->s_io.prev,
|
|
struct inode, i_list);
|
|
struct address_space *mapping = inode->i_mapping;
|
|
struct backing_dev_info *bdi = mapping->backing_dev_info;
|
|
long pages_skipped;
|
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|
|
if (!bdi_cap_writeback_dirty(bdi)) {
|
|
redirty_tail(inode);
|
|
if (sb_is_blkdev_sb(sb)) {
|
|
/*
|
|
* Dirty memory-backed blockdev: the ramdisk
|
|
* driver does this. Skip just this inode
|
|
*/
|
|
continue;
|
|
}
|
|
/*
|
|
* Dirty memory-backed inode against a filesystem other
|
|
* than the kernel-internal bdev filesystem. Skip the
|
|
* entire superblock.
|
|
*/
|
|
break;
|
|
}
|
|
|
|
if (inode->i_state & I_NEW) {
|
|
requeue_io(inode);
|
|
continue;
|
|
}
|
|
|
|
if (wbc->nonblocking && bdi_write_congested(bdi)) {
|
|
wbc->encountered_congestion = 1;
|
|
if (!sb_is_blkdev_sb(sb))
|
|
break; /* Skip a congested fs */
|
|
requeue_io(inode);
|
|
continue; /* Skip a congested blockdev */
|
|
}
|
|
|
|
if (wbc->bdi && bdi != wbc->bdi) {
|
|
if (!sb_is_blkdev_sb(sb))
|
|
break; /* fs has the wrong queue */
|
|
requeue_io(inode);
|
|
continue; /* blockdev has wrong queue */
|
|
}
|
|
|
|
/* Was this inode dirtied after sync_sb_inodes was called? */
|
|
if (time_after(inode->dirtied_when, start))
|
|
break;
|
|
|
|
/* Is another pdflush already flushing this queue? */
|
|
if (current_is_pdflush() && !writeback_acquire(bdi))
|
|
break;
|
|
|
|
BUG_ON(inode->i_state & I_FREEING);
|
|
__iget(inode);
|
|
pages_skipped = wbc->pages_skipped;
|
|
__writeback_single_inode(inode, wbc);
|
|
if (current_is_pdflush())
|
|
writeback_release(bdi);
|
|
if (wbc->pages_skipped != pages_skipped) {
|
|
/*
|
|
* writeback is not making progress due to locked
|
|
* buffers. Skip this inode for now.
|
|
*/
|
|
redirty_tail(inode);
|
|
}
|
|
spin_unlock(&inode_lock);
|
|
iput(inode);
|
|
cond_resched();
|
|
spin_lock(&inode_lock);
|
|
if (wbc->nr_to_write <= 0) {
|
|
wbc->more_io = 1;
|
|
break;
|
|
}
|
|
if (!list_empty(&sb->s_more_io))
|
|
wbc->more_io = 1;
|
|
}
|
|
|
|
if (sync) {
|
|
struct inode *inode, *old_inode = NULL;
|
|
|
|
/*
|
|
* Data integrity sync. Must wait for all pages under writeback,
|
|
* because there may have been pages dirtied before our sync
|
|
* call, but which had writeout started before we write it out.
|
|
* In which case, the inode may not be on the dirty list, but
|
|
* we still have to wait for that writeout.
|
|
*/
|
|
list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
|
|
struct address_space *mapping;
|
|
|
|
if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW))
|
|
continue;
|
|
mapping = inode->i_mapping;
|
|
if (mapping->nrpages == 0)
|
|
continue;
|
|
__iget(inode);
|
|
spin_unlock(&inode_lock);
|
|
/*
|
|
* We hold a reference to 'inode' so it couldn't have
|
|
* been removed from s_inodes list while we dropped the
|
|
* inode_lock. We cannot iput the inode now as we can
|
|
* be holding the last reference and we cannot iput it
|
|
* under inode_lock. So we keep the reference and iput
|
|
* it later.
|
|
*/
|
|
iput(old_inode);
|
|
old_inode = inode;
|
|
|
|
filemap_fdatawait(mapping);
|
|
|
|
cond_resched();
|
|
|
|
spin_lock(&inode_lock);
|
|
}
|
|
spin_unlock(&inode_lock);
|
|
iput(old_inode);
|
|
} else
|
|
spin_unlock(&inode_lock);
|
|
|
|
return; /* Leave any unwritten inodes on s_io */
|
|
}
|
|
EXPORT_SYMBOL_GPL(generic_sync_sb_inodes);
|
|
|
|
static void sync_sb_inodes(struct super_block *sb,
|
|
struct writeback_control *wbc)
|
|
{
|
|
generic_sync_sb_inodes(sb, wbc);
|
|
}
|
|
|
|
/*
|
|
* Start writeback of dirty pagecache data against all unlocked inodes.
|
|
*
|
|
* Note:
|
|
* We don't need to grab a reference to superblock here. If it has non-empty
|
|
* ->s_dirty it's hadn't been killed yet and kill_super() won't proceed
|
|
* past sync_inodes_sb() until the ->s_dirty/s_io/s_more_io lists are all
|
|
* empty. Since __sync_single_inode() regains inode_lock before it finally moves
|
|
* inode from superblock lists we are OK.
|
|
*
|
|
* If `older_than_this' is non-zero then only flush inodes which have a
|
|
* flushtime older than *older_than_this.
|
|
*
|
|
* If `bdi' is non-zero then we will scan the first inode against each
|
|
* superblock until we find the matching ones. One group will be the dirty
|
|
* inodes against a filesystem. Then when we hit the dummy blockdev superblock,
|
|
* sync_sb_inodes will seekout the blockdev which matches `bdi'. Maybe not
|
|
* super-efficient but we're about to do a ton of I/O...
|
|
*/
|
|
void
|
|
writeback_inodes(struct writeback_control *wbc)
|
|
{
|
|
struct super_block *sb;
|
|
|
|
might_sleep();
|
|
spin_lock(&sb_lock);
|
|
restart:
|
|
list_for_each_entry_reverse(sb, &super_blocks, s_list) {
|
|
if (sb_has_dirty_inodes(sb)) {
|
|
/* we're making our own get_super here */
|
|
sb->s_count++;
|
|
spin_unlock(&sb_lock);
|
|
/*
|
|
* If we can't get the readlock, there's no sense in
|
|
* waiting around, most of the time the FS is going to
|
|
* be unmounted by the time it is released.
|
|
*/
|
|
if (down_read_trylock(&sb->s_umount)) {
|
|
if (sb->s_root)
|
|
sync_sb_inodes(sb, wbc);
|
|
up_read(&sb->s_umount);
|
|
}
|
|
spin_lock(&sb_lock);
|
|
if (__put_super_and_need_restart(sb))
|
|
goto restart;
|
|
}
|
|
if (wbc->nr_to_write <= 0)
|
|
break;
|
|
}
|
|
spin_unlock(&sb_lock);
|
|
}
|
|
|
|
/*
|
|
* writeback and wait upon the filesystem's dirty inodes. The caller will
|
|
* do this in two passes - one to write, and one to wait.
|
|
*
|
|
* A finite limit is set on the number of pages which will be written.
|
|
* To prevent infinite livelock of sys_sync().
|
|
*
|
|
* We add in the number of potentially dirty inodes, because each inode write
|
|
* can dirty pagecache in the underlying blockdev.
|
|
*/
|
|
void sync_inodes_sb(struct super_block *sb, int wait)
|
|
{
|
|
struct writeback_control wbc = {
|
|
.sync_mode = wait ? WB_SYNC_ALL : WB_SYNC_NONE,
|
|
.range_start = 0,
|
|
.range_end = LLONG_MAX,
|
|
};
|
|
|
|
if (!wait) {
|
|
unsigned long nr_dirty = global_page_state(NR_FILE_DIRTY);
|
|
unsigned long nr_unstable = global_page_state(NR_UNSTABLE_NFS);
|
|
|
|
wbc.nr_to_write = nr_dirty + nr_unstable +
|
|
(inodes_stat.nr_inodes - inodes_stat.nr_unused);
|
|
} else
|
|
wbc.nr_to_write = LONG_MAX; /* doesn't actually matter */
|
|
|
|
sync_sb_inodes(sb, &wbc);
|
|
}
|
|
|
|
/**
|
|
* sync_inodes - writes all inodes to disk
|
|
* @wait: wait for completion
|
|
*
|
|
* sync_inodes() goes through each super block's dirty inode list, writes the
|
|
* inodes out, waits on the writeout and puts the inodes back on the normal
|
|
* list.
|
|
*
|
|
* This is for sys_sync(). fsync_dev() uses the same algorithm. The subtle
|
|
* part of the sync functions is that the blockdev "superblock" is processed
|
|
* last. This is because the write_inode() function of a typical fs will
|
|
* perform no I/O, but will mark buffers in the blockdev mapping as dirty.
|
|
* What we want to do is to perform all that dirtying first, and then write
|
|
* back all those inode blocks via the blockdev mapping in one sweep. So the
|
|
* additional (somewhat redundant) sync_blockdev() calls here are to make
|
|
* sure that really happens. Because if we call sync_inodes_sb(wait=1) with
|
|
* outstanding dirty inodes, the writeback goes block-at-a-time within the
|
|
* filesystem's write_inode(). This is extremely slow.
|
|
*/
|
|
static void __sync_inodes(int wait)
|
|
{
|
|
struct super_block *sb;
|
|
|
|
spin_lock(&sb_lock);
|
|
restart:
|
|
list_for_each_entry(sb, &super_blocks, s_list) {
|
|
sb->s_count++;
|
|
spin_unlock(&sb_lock);
|
|
down_read(&sb->s_umount);
|
|
if (sb->s_root) {
|
|
sync_inodes_sb(sb, wait);
|
|
sync_blockdev(sb->s_bdev);
|
|
}
|
|
up_read(&sb->s_umount);
|
|
spin_lock(&sb_lock);
|
|
if (__put_super_and_need_restart(sb))
|
|
goto restart;
|
|
}
|
|
spin_unlock(&sb_lock);
|
|
}
|
|
|
|
void sync_inodes(int wait)
|
|
{
|
|
__sync_inodes(0);
|
|
|
|
if (wait)
|
|
__sync_inodes(1);
|
|
}
|
|
|
|
/**
|
|
* write_inode_now - write an inode to disk
|
|
* @inode: inode to write to disk
|
|
* @sync: whether the write should be synchronous or not
|
|
*
|
|
* This function commits an inode to disk immediately if it is dirty. This is
|
|
* primarily needed by knfsd.
|
|
*
|
|
* The caller must either have a ref on the inode or must have set I_WILL_FREE.
|
|
*/
|
|
int write_inode_now(struct inode *inode, int sync)
|
|
{
|
|
int ret;
|
|
struct writeback_control wbc = {
|
|
.nr_to_write = LONG_MAX,
|
|
.sync_mode = sync ? WB_SYNC_ALL : WB_SYNC_NONE,
|
|
.range_start = 0,
|
|
.range_end = LLONG_MAX,
|
|
};
|
|
|
|
if (!mapping_cap_writeback_dirty(inode->i_mapping))
|
|
wbc.nr_to_write = 0;
|
|
|
|
might_sleep();
|
|
spin_lock(&inode_lock);
|
|
ret = __writeback_single_inode(inode, &wbc);
|
|
spin_unlock(&inode_lock);
|
|
if (sync)
|
|
inode_sync_wait(inode);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(write_inode_now);
|
|
|
|
/**
|
|
* sync_inode - write an inode and its pages to disk.
|
|
* @inode: the inode to sync
|
|
* @wbc: controls the writeback mode
|
|
*
|
|
* sync_inode() will write an inode and its pages to disk. It will also
|
|
* correctly update the inode on its superblock's dirty inode lists and will
|
|
* update inode->i_state.
|
|
*
|
|
* The caller must have a ref on the inode.
|
|
*/
|
|
int sync_inode(struct inode *inode, struct writeback_control *wbc)
|
|
{
|
|
int ret;
|
|
|
|
spin_lock(&inode_lock);
|
|
ret = __writeback_single_inode(inode, wbc);
|
|
spin_unlock(&inode_lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(sync_inode);
|
|
|
|
/**
|
|
* generic_osync_inode - flush all dirty data for a given inode to disk
|
|
* @inode: inode to write
|
|
* @mapping: the address_space that should be flushed
|
|
* @what: what to write and wait upon
|
|
*
|
|
* This can be called by file_write functions for files which have the
|
|
* O_SYNC flag set, to flush dirty writes to disk.
|
|
*
|
|
* @what is a bitmask, specifying which part of the inode's data should be
|
|
* written and waited upon.
|
|
*
|
|
* OSYNC_DATA: i_mapping's dirty data
|
|
* OSYNC_METADATA: the buffers at i_mapping->private_list
|
|
* OSYNC_INODE: the inode itself
|
|
*/
|
|
|
|
int generic_osync_inode(struct inode *inode, struct address_space *mapping, int what)
|
|
{
|
|
int err = 0;
|
|
int need_write_inode_now = 0;
|
|
int err2;
|
|
|
|
if (what & OSYNC_DATA)
|
|
err = filemap_fdatawrite(mapping);
|
|
if (what & (OSYNC_METADATA|OSYNC_DATA)) {
|
|
err2 = sync_mapping_buffers(mapping);
|
|
if (!err)
|
|
err = err2;
|
|
}
|
|
if (what & OSYNC_DATA) {
|
|
err2 = filemap_fdatawait(mapping);
|
|
if (!err)
|
|
err = err2;
|
|
}
|
|
|
|
spin_lock(&inode_lock);
|
|
if ((inode->i_state & I_DIRTY) &&
|
|
((what & OSYNC_INODE) || (inode->i_state & I_DIRTY_DATASYNC)))
|
|
need_write_inode_now = 1;
|
|
spin_unlock(&inode_lock);
|
|
|
|
if (need_write_inode_now) {
|
|
err2 = write_inode_now(inode, 1);
|
|
if (!err)
|
|
err = err2;
|
|
}
|
|
else
|
|
inode_sync_wait(inode);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(generic_osync_inode);
|