diff options
Diffstat (limited to 'fs/xfs/linux-2.6/xfs_sync.c')
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_sync.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c index c765eb2a8dc..a51534c71b3 100644 --- a/fs/xfs/linux-2.6/xfs_sync.c +++ b/fs/xfs/linux-2.6/xfs_sync.c @@ -44,6 +44,9 @@ #include "xfs_inode_item.h" #include "xfs_rw.h" +#include <linux/kthread.h> +#include <linux/freezer.h> + /* * xfs_sync flushes any pending I/O to file system vfsp. * @@ -603,3 +606,163 @@ xfs_syncsub( return XFS_ERROR(last_error); } + +/* + * Enqueue a work item to be picked up by the vfs xfssyncd thread. + * Doing this has two advantages: + * - It saves on stack space, which is tight in certain situations + * - It can be used (with care) as a mechanism to avoid deadlocks. + * Flushing while allocating in a full filesystem requires both. + */ +STATIC void +xfs_syncd_queue_work( + struct xfs_mount *mp, + void *data, + void (*syncer)(struct xfs_mount *, void *)) +{ + struct bhv_vfs_sync_work *work; + + work = kmem_alloc(sizeof(struct bhv_vfs_sync_work), KM_SLEEP); + INIT_LIST_HEAD(&work->w_list); + work->w_syncer = syncer; + work->w_data = data; + work->w_mount = mp; + spin_lock(&mp->m_sync_lock); + list_add_tail(&work->w_list, &mp->m_sync_list); + spin_unlock(&mp->m_sync_lock); + wake_up_process(mp->m_sync_task); +} + +/* + * Flush delayed allocate data, attempting to free up reserved space + * from existing allocations. At this point a new allocation attempt + * has failed with ENOSPC and we are in the process of scratching our + * heads, looking about for more room... + */ +STATIC void +xfs_flush_inode_work( + struct xfs_mount *mp, + void *arg) +{ + struct inode *inode = arg; + filemap_flush(inode->i_mapping); + iput(inode); +} + +void +xfs_flush_inode( + xfs_inode_t *ip) +{ + struct inode *inode = VFS_I(ip); + + igrab(inode); + xfs_syncd_queue_work(ip->i_mount, inode, xfs_flush_inode_work); + delay(msecs_to_jiffies(500)); +} + +/* + * This is the "bigger hammer" version of xfs_flush_inode_work... + * (IOW, "If at first you don't succeed, use a Bigger Hammer"). + */ +STATIC void +xfs_flush_device_work( + struct xfs_mount *mp, + void *arg) +{ + struct inode *inode = arg; + sync_blockdev(mp->m_super->s_bdev); + iput(inode); +} + +void +xfs_flush_device( + xfs_inode_t *ip) +{ + struct inode *inode = VFS_I(ip); + + igrab(inode); + xfs_syncd_queue_work(ip->i_mount, inode, xfs_flush_device_work); + delay(msecs_to_jiffies(500)); + xfs_log_force(ip->i_mount, (xfs_lsn_t)0, XFS_LOG_FORCE|XFS_LOG_SYNC); +} + +STATIC void +xfs_sync_worker( + struct xfs_mount *mp, + void *unused) +{ + int error; + + if (!(mp->m_flags & XFS_MOUNT_RDONLY)) + error = xfs_sync(mp, SYNC_FSDATA | SYNC_BDFLUSH | SYNC_ATTR); + mp->m_sync_seq++; + wake_up(&mp->m_wait_single_sync_task); +} + +STATIC int +xfssyncd( + void *arg) +{ + struct xfs_mount *mp = arg; + long timeleft; + bhv_vfs_sync_work_t *work, *n; + LIST_HEAD (tmp); + + set_freezable(); + timeleft = xfs_syncd_centisecs * msecs_to_jiffies(10); + for (;;) { + timeleft = schedule_timeout_interruptible(timeleft); + /* swsusp */ + try_to_freeze(); + if (kthread_should_stop() && list_empty(&mp->m_sync_list)) + break; + + spin_lock(&mp->m_sync_lock); + /* + * We can get woken by laptop mode, to do a sync - + * that's the (only!) case where the list would be + * empty with time remaining. + */ + if (!timeleft || list_empty(&mp->m_sync_list)) { + if (!timeleft) + timeleft = xfs_syncd_centisecs * + msecs_to_jiffies(10); + INIT_LIST_HEAD(&mp->m_sync_work.w_list); + list_add_tail(&mp->m_sync_work.w_list, + &mp->m_sync_list); + } + list_for_each_entry_safe(work, n, &mp->m_sync_list, w_list) + list_move(&work->w_list, &tmp); + spin_unlock(&mp->m_sync_lock); + + list_for_each_entry_safe(work, n, &tmp, w_list) { + (*work->w_syncer)(mp, work->w_data); + list_del(&work->w_list); + if (work == &mp->m_sync_work) + continue; + kmem_free(work); + } + } + + return 0; +} + +int +xfs_syncd_init( + struct xfs_mount *mp) +{ + mp->m_sync_work.w_syncer = xfs_sync_worker; + mp->m_sync_work.w_mount = mp; + mp->m_sync_task = kthread_run(xfssyncd, mp, "xfssyncd"); + if (IS_ERR(mp->m_sync_task)) + return -PTR_ERR(mp->m_sync_task); + return 0; +} + +void +xfs_syncd_stop( + struct xfs_mount *mp) +{ + kthread_stop(mp->m_sync_task); +} + |