diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/autofs/waitq.c | 2 | ||||
| -rw-r--r-- | fs/btrfs/dev-replace.c | 46 | ||||
| -rw-r--r-- | fs/btrfs/volumes.c | 13 | ||||
| -rw-r--r-- | fs/btrfs/volumes.h | 3 | ||||
| -rw-r--r-- | fs/eventpoll.c | 72 | ||||
| -rw-r--r-- | fs/io_uring.c | 23 | ||||
| -rw-r--r-- | fs/nfs/dir.c | 3 | ||||
| -rw-r--r-- | fs/nfs/flexfilelayout/flexfilelayout.c | 43 | ||||
| -rw-r--r-- | fs/nfs/nfs42proc.c | 10 | ||||
| -rw-r--r-- | fs/pipe.c | 62 | ||||
| -rw-r--r-- | fs/read_write.c | 8 | ||||
| -rw-r--r-- | fs/splice.c | 8 |
12 files changed, 189 insertions, 104 deletions
diff --git a/fs/autofs/waitq.c b/fs/autofs/waitq.c index 74c886f7c51c..5ced859dac53 100644 --- a/fs/autofs/waitq.c +++ b/fs/autofs/waitq.c @@ -53,7 +53,7 @@ static int autofs_write(struct autofs_sb_info *sbi, mutex_lock(&sbi->pipe_mutex); while (bytes) { - wr = kernel_write(file, data, bytes, &file->f_pos); + wr = __kernel_write(file, data, bytes, NULL); if (wr <= 0) break; data += wr; diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c index db93909b25e0..e4a1c6afe35d 100644 --- a/fs/btrfs/dev-replace.c +++ b/fs/btrfs/dev-replace.c @@ -599,6 +599,37 @@ static void btrfs_rm_dev_replace_unblocked(struct btrfs_fs_info *fs_info) wake_up(&fs_info->dev_replace.replace_wait); } +/* + * When finishing the device replace, before swapping the source device with the + * target device we must update the chunk allocation state in the target device, + * as it is empty because replace works by directly copying the chunks and not + * through the normal chunk allocation path. + */ +static int btrfs_set_target_alloc_state(struct btrfs_device *srcdev, + struct btrfs_device *tgtdev) +{ + struct extent_state *cached_state = NULL; + u64 start = 0; + u64 found_start; + u64 found_end; + int ret = 0; + + lockdep_assert_held(&srcdev->fs_info->chunk_mutex); + + while (!find_first_extent_bit(&srcdev->alloc_state, start, + &found_start, &found_end, + CHUNK_ALLOCATED, &cached_state)) { + ret = set_extent_bits(&tgtdev->alloc_state, found_start, + found_end, CHUNK_ALLOCATED); + if (ret) + break; + start = found_end + 1; + } + + free_extent_state(cached_state); + return ret; +} + static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, int scrub_ret) { @@ -673,8 +704,14 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, dev_replace->time_stopped = ktime_get_real_seconds(); dev_replace->item_needs_writeback = 1; - /* replace old device with new one in mapping tree */ + /* + * Update allocation state in the new device and replace the old device + * with the new one in the mapping tree. + */ if (!scrub_ret) { + scrub_ret = btrfs_set_target_alloc_state(src_device, tgt_device); + if (scrub_ret) + goto error; btrfs_dev_replace_update_device_in_mapping_tree(fs_info, src_device, tgt_device); @@ -685,6 +722,7 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, btrfs_dev_name(src_device), src_device->devid, rcu_str_deref(tgt_device->name), scrub_ret); +error: up_write(&dev_replace->rwsem); mutex_unlock(&fs_info->chunk_mutex); mutex_unlock(&fs_info->fs_devices->device_list_mutex); @@ -745,7 +783,9 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, /* replace the sysfs entry */ btrfs_sysfs_remove_devices_dir(fs_info->fs_devices, src_device); btrfs_sysfs_update_devid(tgt_device); - btrfs_rm_dev_replace_free_srcdev(src_device); + if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &src_device->dev_state)) + btrfs_scratch_superblocks(fs_info, src_device->bdev, + src_device->name->str); /* write back the superblocks */ trans = btrfs_start_transaction(root, 0); @@ -754,6 +794,8 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); + btrfs_rm_dev_replace_free_srcdev(src_device); + return 0; } diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 117b43367629..1997a7d67f22 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1999,9 +1999,9 @@ static u64 btrfs_num_devices(struct btrfs_fs_info *fs_info) return num_devices; } -static void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info, - struct block_device *bdev, - const char *device_path) +void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info, + struct block_device *bdev, + const char *device_path) { struct btrfs_super_block *disk_super; int copy_num; @@ -2224,11 +2224,7 @@ void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev) struct btrfs_fs_info *fs_info = srcdev->fs_info; struct btrfs_fs_devices *fs_devices = srcdev->fs_devices; - if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &srcdev->dev_state)) { - /* zero out the old super if it is writable */ - btrfs_scratch_superblocks(fs_info, srcdev->bdev, - srcdev->name->str); - } + mutex_lock(&uuid_mutex); btrfs_close_bdev(srcdev); synchronize_rcu(); @@ -2258,6 +2254,7 @@ void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev) close_fs_devices(fs_devices); free_fs_devices(fs_devices); } + mutex_unlock(&uuid_mutex); } void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev) diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 5eea93916fbf..302c9234f7d0 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -573,6 +573,9 @@ void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info); void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info); bool btrfs_check_rw_degradable(struct btrfs_fs_info *fs_info, struct btrfs_device *failing_dev); +void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info, + struct block_device *bdev, + const char *device_path); int btrfs_bg_type_to_factor(u64 flags); const char *btrfs_bg_type_to_raid_name(u64 flags); diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 8107e06d7f6f..4df61129566d 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -218,8 +218,7 @@ struct eventpoll { struct file *file; /* used to optimize loop detection check */ - struct list_head visited_list_link; - int visited; + u64 gen; #ifdef CONFIG_NET_RX_BUSY_POLL /* used to track busy poll napi_id */ @@ -274,6 +273,8 @@ static long max_user_watches __read_mostly; */ static DEFINE_MUTEX(epmutex); +static u64 loop_check_gen = 0; + /* Used to check for epoll file descriptor inclusion loops */ static struct nested_calls poll_loop_ncalls; @@ -283,9 +284,6 @@ static struct kmem_cache *epi_cache __read_mostly; /* Slab cache used to allocate "struct eppoll_entry" */ static struct kmem_cache *pwq_cache __read_mostly; -/* Visited nodes during ep_loop_check(), so we can unset them when we finish */ -static LIST_HEAD(visited_list); - /* * List of files with newly added links, where we may need to limit the number * of emanating paths. Protected by the epmutex. @@ -1450,7 +1448,7 @@ static int reverse_path_check(void) static int ep_create_wakeup_source(struct epitem *epi) { - const char *name; + struct name_snapshot n; struct wakeup_source *ws; if (!epi->ep->ws) { @@ -1459,8 +1457,9 @@ static int ep_create_wakeup_source(struct epitem *epi) return -ENOMEM; } - name = epi->ffd.file->f_path.dentry->d_name.name; - ws = wakeup_source_register(NULL, name); + take_dentry_name_snapshot(&n, epi->ffd.file->f_path.dentry); + ws = wakeup_source_register(NULL, n.name.name); + release_dentry_name_snapshot(&n); if (!ws) return -ENOMEM; @@ -1522,6 +1521,22 @@ static int ep_insert(struct eventpoll *ep, const struct epoll_event *event, RCU_INIT_POINTER(epi->ws, NULL); } + /* Add the current item to the list of active epoll hook for this file */ + spin_lock(&tfile->f_lock); + list_add_tail_rcu(&epi->fllink, &tfile->f_ep_links); + spin_unlock(&tfile->f_lock); + + /* + * Add the current item to the RB tree. All RB tree operations are + * protected by "mtx", and ep_insert() is called with "mtx" held. + */ + ep_rbtree_insert(ep, epi); + + /* now check if we've created too many backpaths */ + error = -EINVAL; + if (full_check && reverse_path_check()) + goto error_remove_epi; + /* Initialize the poll table using the queue callback */ epq.epi = epi; init_poll_funcptr(&epq.pt, ep_ptable_queue_proc); @@ -1544,22 +1559,6 @@ static int ep_insert(struct eventpoll *ep, const struct epoll_event *event, if (epi->nwait < 0) goto error_unregister; - /* Add the current item to the list of active epoll hook for this file */ - spin_lock(&tfile->f_lock); - list_add_tail_rcu(&epi->fllink, &tfile->f_ep_links); - spin_unlock(&tfile->f_lock); - - /* - * Add the current item to the RB tree. All RB tree operations are - * protected by "mtx", and ep_insert() is called with "mtx" held. - */ - ep_rbtree_insert(ep, epi); - - /* now check if we've created too many backpaths */ - error = -EINVAL; - if (full_check && reverse_path_check()) - goto error_remove_epi; - /* We have to drop the new item inside our item list to keep track of it */ write_lock_irq(&ep->lock); @@ -1588,6 +1587,8 @@ static int ep_insert(struct eventpoll *ep, const struct epoll_event *event, return 0; +error_unregister: + ep_unregister_pollwait(ep, epi); error_remove_epi: spin_lock(&tfile->f_lock); list_del_rcu(&epi->fllink); @@ -1595,9 +1596,6 @@ error_remove_epi: rb_erase_cached(&epi->rbn, &ep->rbr); -error_unregister: - ep_unregister_pollwait(ep, epi); - /* * We need to do this because an event could have been arrived on some * allocated wait queue. Note that we don't care about the ep->ovflist @@ -1972,13 +1970,12 @@ static int ep_loop_check_proc(void *priv, void *cookie, int call_nests) struct epitem *epi; mutex_lock_nested(&ep->mtx, call_nests + 1); - ep->visited = 1; - list_add(&ep->visited_list_link, &visited_list); + ep->gen = loop_check_gen; for (rbp = rb_first_cached(&ep->rbr); rbp; rbp = rb_next(rbp)) { epi = rb_entry(rbp, struct epitem, rbn); if (unlikely(is_file_epoll(epi->ffd.file))) { ep_tovisit = epi->ffd.file->private_data; - if (ep_tovisit->visited) + if (ep_tovisit->gen == loop_check_gen) continue; error = ep_call_nested(&poll_loop_ncalls, ep_loop_check_proc, epi->ffd.file, @@ -2019,18 +2016,8 @@ static int ep_loop_check_proc(void *priv, void *cookie, int call_nests) */ static int ep_loop_check(struct eventpoll *ep, struct file *file) { - int ret; - struct eventpoll *ep_cur, *ep_next; - - ret = ep_call_nested(&poll_loop_ncalls, + return ep_call_nested(&poll_loop_ncalls, ep_loop_check_proc, file, ep, current); - /* clear visited list */ - list_for_each_entry_safe(ep_cur, ep_next, &visited_list, - visited_list_link) { - ep_cur->visited = 0; - list_del(&ep_cur->visited_list_link); - } - return ret; } static void clear_tfile_check_list(void) @@ -2195,11 +2182,13 @@ int do_epoll_ctl(int epfd, int op, int fd, struct epoll_event *epds, goto error_tgt_fput; if (op == EPOLL_CTL_ADD) { if (!list_empty(&f.file->f_ep_links) || + ep->gen == loop_check_gen || is_file_epoll(tf.file)) { mutex_unlock(&ep->mtx); error = epoll_mutex_lock(&epmutex, 0, nonblock); if (error) goto error_tgt_fput; + loop_check_gen++; full_check = 1; if (is_file_epoll(tf.file)) { error = -ELOOP; @@ -2263,6 +2252,7 @@ int do_epoll_ctl(int epfd, int op, int fd, struct epoll_event *epds, error_tgt_fput: if (full_check) { clear_tfile_check_list(); + loop_check_gen++; mutex_unlock(&epmutex); } diff --git a/fs/io_uring.c b/fs/io_uring.c index eed0d068904c..aae0ef2ec34d 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -3049,6 +3049,7 @@ static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, if (!wake_page_match(wpq, key)) return 0; + req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; list_del_init(&wait->entry); init_task_work(&req->task_work, io_req_task_submit); @@ -3106,6 +3107,7 @@ static bool io_rw_should_retry(struct io_kiocb *req) wait->wait.flags = 0; INIT_LIST_HEAD(&wait->wait.entry); kiocb->ki_flags |= IOCB_WAITQ; + kiocb->ki_flags &= ~IOCB_NOWAIT; kiocb->ki_waitq = wait; io_get_req_task(req); @@ -4743,6 +4745,8 @@ static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, if (mask && !(mask & poll->events)) return 0; + list_del_init(&wait->entry); + if (poll && poll->head) { bool done; @@ -8412,11 +8416,19 @@ static int io_uring_show_cred(int id, void *p, void *data) static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) { + bool has_lock; int i; - mutex_lock(&ctx->uring_lock); + /* + * Avoid ABBA deadlock between the seq lock and the io_uring mutex, + * since fdinfo case grabs it in the opposite direction of normal use + * cases. If we fail to get the lock, we just don't iterate any + * structures that could be going away outside the io_uring mutex. + */ + has_lock = mutex_trylock(&ctx->uring_lock); + seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); - for (i = 0; i < ctx->nr_user_files; i++) { + for (i = 0; has_lock && i < ctx->nr_user_files; i++) { struct fixed_file_table *table; struct file *f; @@ -8428,13 +8440,13 @@ static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) seq_printf(m, "%5u: <none>\n", i); } seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); - for (i = 0; i < ctx->nr_user_bufs; i++) { + for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, (unsigned int) buf->len); } - if (!idr_is_empty(&ctx->personality_idr)) { + if (has_lock && !idr_is_empty(&ctx->personality_idr)) { seq_printf(m, "Personalities:\n"); idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); } @@ -8449,7 +8461,8 @@ static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) req->task->task_works != NULL); } spin_unlock_irq(&ctx->completion_lock); - mutex_unlock(&ctx->uring_lock); + if (has_lock) + mutex_unlock(&ctx->uring_lock); } static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index e732580fe47b..cb52db9a0cfb 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -579,6 +579,9 @@ int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *en xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); do { + if (entry->label) + entry->label->len = NFS4_MAXLABELLEN; + status = xdr_decode(desc, entry, &stream); if (status != 0) { if (status == -EAGAIN) diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c index ff8965d1a4d4..a163533446fa 100644 --- a/fs/nfs/flexfilelayout/flexfilelayout.c +++ b/fs/nfs/flexfilelayout/flexfilelayout.c @@ -715,7 +715,7 @@ nfs4_ff_layout_stat_io_end_write(struct rpc_task *task, } static void -ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, int idx) +ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, u32 idx) { struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); @@ -724,7 +724,7 @@ ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, int idx) } static void -ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, int idx) +ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx) { struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); @@ -734,14 +734,14 @@ ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, int idx) static struct nfs4_pnfs_ds * ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg, - int start_idx, int *best_idx, + u32 start_idx, u32 *best_idx, bool check_device) { struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); struct nfs4_ff_layout_mirror *mirror; struct nfs4_pnfs_ds *ds; bool fail_return = false; - int idx; + u32 idx; /* mirrors are initially sorted by efficiency */ for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) { @@ -766,21 +766,21 @@ ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg, static struct nfs4_pnfs_ds * ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg, - int start_idx, int *best_idx) + u32 start_idx, u32 *best_idx) { return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false); } static struct nfs4_pnfs_ds * ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg, - int start_idx, int *best_idx) + u32 start_idx, u32 *best_idx) { return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true); } static struct nfs4_pnfs_ds * ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, - int start_idx, int *best_idx) + u32 start_idx, u32 *best_idx) { struct nfs4_pnfs_ds *ds; @@ -791,7 +791,8 @@ ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, } static struct nfs4_pnfs_ds * -ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio, int *best_idx) +ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio, + u32 *best_idx) { struct pnfs_layout_segment *lseg = pgio->pg_lseg; struct nfs4_pnfs_ds *ds; @@ -837,7 +838,7 @@ ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_pgio_mirror *pgm; struct nfs4_ff_layout_mirror *mirror; struct nfs4_pnfs_ds *ds; - int ds_idx; + u32 ds_idx, i; retry: ff_layout_pg_check_layout(pgio, req); @@ -863,14 +864,14 @@ retry: goto retry; } - mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx); + for (i = 0; i < pgio->pg_mirror_count; i++) { + mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i); + pgm = &pgio->pg_mirrors[i]; + pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize; + } pgio->pg_mirror_idx = ds_idx; - /* read always uses only one mirror - idx 0 for pgio layer */ - pgm = &pgio->pg_mirrors[0]; - pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize; - if (NFS_SERVER(pgio->pg_inode)->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) pgio->pg_maxretrans = io_maxretrans; @@ -894,7 +895,7 @@ ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs4_ff_layout_mirror *mirror; struct nfs_pgio_mirror *pgm; struct nfs4_pnfs_ds *ds; - int i; + u32 i; retry: ff_layout_pg_check_layout(pgio, req); @@ -1038,7 +1039,7 @@ static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs) static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr) { u32 idx = hdr->pgio_mirror_idx + 1; - int new_idx = 0; + u32 new_idx = 0; if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx + 1, &new_idx)) ff_layout_send_layouterror(hdr->lseg); @@ -1075,7 +1076,7 @@ static int ff_layout_async_handle_error_v4(struct rpc_task *task, struct nfs4_state *state, struct nfs_client *clp, struct pnfs_layout_segment *lseg, - int idx) + u32 idx) { struct pnfs_layout_hdr *lo = lseg->pls_layout; struct inode *inode = lo->plh_inode; @@ -1149,7 +1150,7 @@ reset: /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */ static int ff_layout_async_handle_error_v3(struct rpc_task *task, struct pnfs_layout_segment *lseg, - int idx) + u32 idx) { struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); @@ -1184,7 +1185,7 @@ static int ff_layout_async_handle_error(struct rpc_task *task, struct nfs4_state *state, struct nfs_client *clp, struct pnfs_layout_segment *lseg, - int idx) + u32 idx) { int vers = clp->cl_nfs_mod->rpc_vers->number; @@ -1211,7 +1212,7 @@ static int ff_layout_async_handle_error(struct rpc_task *task, } static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg, - int idx, u64 offset, u64 length, + u32 idx, u64 offset, u64 length, u32 *op_status, int opnum, int error) { struct nfs4_ff_layout_mirror *mirror; @@ -1809,7 +1810,7 @@ ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync) loff_t offset = hdr->args.offset; int vers; struct nfs_fh *fh; - int idx = hdr->pgio_mirror_idx; + u32 idx = hdr->pgio_mirror_idx; mirror = FF_LAYOUT_COMP(lseg, idx); ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c index 142225f0af59..2b2211d1234e 100644 --- a/fs/nfs/nfs42proc.c +++ b/fs/nfs/nfs42proc.c @@ -356,7 +356,15 @@ static ssize_t _nfs42_proc_copy(struct file *src, truncate_pagecache_range(dst_inode, pos_dst, pos_dst + res->write_res.count); - + spin_lock(&dst_inode->i_lock); + NFS_I(dst_inode)->cache_validity |= (NFS_INO_REVAL_PAGECACHE | + NFS_INO_REVAL_FORCED | NFS_INO_INVALID_SIZE | + NFS_INO_INVALID_ATTR | NFS_INO_INVALID_DATA); + spin_unlock(&dst_inode->i_lock); + spin_lock(&src_inode->i_lock); + NFS_I(src_inode)->cache_validity |= (NFS_INO_REVAL_PAGECACHE | + NFS_INO_REVAL_FORCED | NFS_INO_INVALID_ATIME); + spin_unlock(&src_inode->i_lock); status = res->write_res.count; out: if (args->sync) diff --git a/fs/pipe.c b/fs/pipe.c index 60dbee457143..117db82b10af 100644 --- a/fs/pipe.c +++ b/fs/pipe.c @@ -106,25 +106,6 @@ void pipe_double_lock(struct pipe_inode_info *pipe1, } } -/* Drop the inode semaphore and wait for a pipe event, atomically */ -void pipe_wait(struct pipe_inode_info *pipe) -{ - DEFINE_WAIT(rdwait); - DEFINE_WAIT(wrwait); - - /* - * Pipes are system-local resources, so sleeping on them - * is considered a noninteractive wait: - */ - prepare_to_wait(&pipe->rd_wait, &rdwait, TASK_INTERRUPTIBLE); - prepare_to_wait(&pipe->wr_wait, &wrwait, TASK_INTERRUPTIBLE); - pipe_unlock(pipe); - schedule(); - finish_wait(&pipe->rd_wait, &rdwait); - finish_wait(&pipe->wr_wait, &wrwait); - pipe_lock(pipe); -} - static void anon_pipe_buf_release(struct pipe_inode_info *pipe, struct pipe_buffer *buf) { @@ -1035,12 +1016,52 @@ SYSCALL_DEFINE1(pipe, int __user *, fildes) return do_pipe2(fildes, 0); } +/* + * This is the stupid "wait for pipe to be readable or writable" + * model. + * + * See pipe_read/write() for the proper kind of exclusive wait, + * but that requires that we wake up any other readers/writers + * if we then do not end up reading everything (ie the whole + * "wake_next_reader/writer" logic in pipe_read/write()). + */ +void pipe_wait_readable(struct pipe_inode_info *pipe) +{ + pipe_unlock(pipe); + wait_event_interruptible(pipe->rd_wait, pipe_readable(pipe)); + pipe_lock(pipe); +} + +void pipe_wait_writable(struct pipe_inode_info *pipe) +{ + pipe_unlock(pipe); + wait_event_interruptible(pipe->wr_wait, pipe_writable(pipe)); + pipe_lock(pipe); +} + +/* + * This depends on both the wait (here) and the wakeup (wake_up_partner) + * holding the pipe lock, so "*cnt" is stable and we know a wakeup cannot + * race with the count check and waitqueue prep. + * + * Normally in order to avoid races, you'd do the prepare_to_wait() first, + * then check the condition you're waiting for, and only then sleep. But + * because of the pipe lock, we can check the condition before being on + * the wait queue. + * + * We use the 'rd_wait' waitqueue for pipe partner waiting. + */ static int wait_for_partner(struct pipe_inode_info *pipe, unsigned int *cnt) { + DEFINE_WAIT(rdwait); int cur = *cnt; while (cur == *cnt) { - pipe_wait(pipe); + prepare_to_wait(&pipe->rd_wait, &rdwait, TASK_INTERRUPTIBLE); + pipe_unlock(pipe); + schedule(); + finish_wait(&pipe->rd_wait, &rdwait); + pipe_lock(pipe); if (signal_pending(current)) break; } @@ -1050,7 +1071,6 @@ static int wait_for_partner(struct pipe_inode_info *pipe, unsigned int *cnt) static void wake_up_partner(struct pipe_inode_info *pipe) { wake_up_interruptible_all(&pipe->rd_wait); - wake_up_interruptible_all(&pipe->wr_wait); } static int fifo_open(struct inode *inode, struct file *filp) diff --git a/fs/read_write.c b/fs/read_write.c index 5db58b8c78d0..d3428189f36b 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -538,6 +538,14 @@ ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t inc_syscw(current); return ret; } +/* + * This "EXPORT_SYMBOL_GPL()" is more of a "EXPORT_SYMBOL_DONTUSE()", + * but autofs is one of the few internal kernel users that actually + * wants this _and_ can be built as a module. So we need to export + * this symbol for autofs, even though it really isn't appropriate + * for any other kernel modules. + */ +EXPORT_SYMBOL_GPL(__kernel_write); ssize_t kernel_write(struct file *file, const void *buf, size_t count, loff_t *pos) diff --git a/fs/splice.c b/fs/splice.c index d7c8a7c4db07..c3d00dfc7344 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -563,7 +563,7 @@ static int splice_from_pipe_next(struct pipe_inode_info *pipe, struct splice_des sd->need_wakeup = false; } - pipe_wait(pipe); + pipe_wait_readable(pipe); } return 1; @@ -1077,7 +1077,7 @@ static int wait_for_space(struct pipe_inode_info *pipe, unsigned flags) return -EAGAIN; if (signal_pending(current)) return -ERESTARTSYS; - pipe_wait(pipe); + pipe_wait_writable(pipe); } } @@ -1454,7 +1454,7 @@ static int ipipe_prep(struct pipe_inode_info *pipe, unsigned int flags) ret = -EAGAIN; break; } - pipe_wait(pipe); + pipe_wait_readable(pipe); } pipe_unlock(pipe); @@ -1493,7 +1493,7 @@ static int opipe_prep(struct pipe_inode_info *pipe, unsigned int flags) ret = -ERESTARTSYS; break; } - pipe_wait(pipe); + pipe_wait_writable(pipe); } pipe_unlock(pipe); |