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Wong" , Matthew Wilcox , Mel Gorman Date: Tue, 14 Sep 2021 10:13:04 +1000 Subject: [PATCH 3/6] EXT4: Remove ENOMEM/congestion_wait() loops. Cc: linux-xfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Message-ID: <163157838437.13293.14244628630141187199.stgit@noble.brown> In-Reply-To: <163157808321.13293.486682642188075090.stgit@noble.brown> References: <163157808321.13293.486682642188075090.stgit@noble.brown> User-Agent: StGit/0.23 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org Indefinite loops waiting for memory allocation are discouraged by documentation in gfp.h which says the use of __GFP_NOFAIL that it is definitely preferable to use the flag rather than opencode endless loop around allocator. Such loops that use congestion_wait() are particularly unwise as congestion_wait() is indistinguishable from schedule_timeout_uninterruptible() in practice - and should be deprecated. So this patch changes the two loops in ext4_ext_truncate() to use __GFP_NOFAIL instead of looping. As the allocation is multiple layers deeper in the call stack, this requires passing the EXT4_EX_NOFAIL flag down and handling it in various places. Of particular interest is the ext4_journal_start family of calls which can now have EXT4_EX_NOFAIL 'or'ed in to the 'type'. This could be seen as a blurring of types. However 'type' is 8 bits, and EXT4_EX_NOFAIL is a high bit, so it is safe in practice. jbd2__journal_start() is enhanced so that the gfp_t flags passed are used for *all* allocations. Signed-off-by: NeilBrown --- fs/ext4/ext4.h | 2 +- fs/ext4/ext4_jbd2.c | 8 +++++++- fs/ext4/extents.c | 49 +++++++++++++++++----------------------------- fs/ext4/extents_status.c | 35 +++++++++++++++++++-------------- fs/ext4/extents_status.h | 2 +- fs/ext4/indirect.c | 2 +- fs/ext4/inode.c | 6 +++--- fs/ext4/ioctl.c | 4 ++-- fs/ext4/super.c | 2 +- fs/jbd2/transaction.c | 8 ++++---- 10 files changed, 58 insertions(+), 60 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 90ff5acaf11f..52a34f5dfda2 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -3720,7 +3720,7 @@ extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, struct ext4_map_blocks *map, int flags); extern int ext4_ext_truncate(handle_t *, struct inode *); extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, - ext4_lblk_t end); + ext4_lblk_t end, int nofail); extern void ext4_ext_init(struct super_block *); extern void ext4_ext_release(struct super_block *); extern long ext4_fallocate(struct file *file, int mode, loff_t offset, diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c index 6def7339056d..2bdda3b7a3e6 100644 --- a/fs/ext4/ext4_jbd2.c +++ b/fs/ext4/ext4_jbd2.c @@ -92,6 +92,12 @@ handle_t *__ext4_journal_start_sb(struct super_block *sb, unsigned int line, { journal_t *journal; int err; + gfp_t gfp_mask = GFP_NOFS; + + if (type & EXT4_EX_NOFAIL) { + gfp_mask |= __GFP_NOFAIL; + type &= ~EXT4_EX_NOFAIL; + } trace_ext4_journal_start(sb, blocks, rsv_blocks, revoke_creds, _RET_IP_); @@ -103,7 +109,7 @@ handle_t *__ext4_journal_start_sb(struct super_block *sb, unsigned int line, if (!journal || (EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY)) return ext4_get_nojournal(); return jbd2__journal_start(journal, blocks, rsv_blocks, revoke_creds, - GFP_NOFS, type, line); + gfp_mask, type, line); } int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index c0de30f25185..b7bc12aedf78 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -1488,7 +1488,7 @@ static int ext4_ext_search_left(struct inode *inode, static int ext4_ext_search_right(struct inode *inode, struct ext4_ext_path *path, ext4_lblk_t *logical, ext4_fsblk_t *phys, - struct ext4_extent *ret_ex) + struct ext4_extent *ret_ex, int nofail) { struct buffer_head *bh = NULL; struct ext4_extent_header *eh; @@ -1565,7 +1565,7 @@ static int ext4_ext_search_right(struct inode *inode, while (++depth < path->p_depth) { /* subtract from p_depth to get proper eh_depth */ bh = read_extent_tree_block(inode, block, - path->p_depth - depth, 0); + path->p_depth - depth, nofail); if (IS_ERR(bh)) return PTR_ERR(bh); eh = ext_block_hdr(bh); @@ -1574,7 +1574,7 @@ static int ext4_ext_search_right(struct inode *inode, put_bh(bh); } - bh = read_extent_tree_block(inode, block, path->p_depth - depth, 0); + bh = read_extent_tree_block(inode, block, path->p_depth - depth, nofail); if (IS_ERR(bh)) return PTR_ERR(bh); eh = ext_block_hdr(bh); @@ -2773,7 +2773,7 @@ ext4_ext_more_to_rm(struct ext4_ext_path *path) } int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, - ext4_lblk_t end) + ext4_lblk_t end, int nofail) { struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); int depth = ext_depth(inode); @@ -2789,7 +2789,8 @@ int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, ext_debug(inode, "truncate since %u to %u\n", start, end); /* probably first extent we're gonna free will be last in block */ - handle = ext4_journal_start_with_revoke(inode, EXT4_HT_TRUNCATE, + handle = ext4_journal_start_with_revoke(inode, + EXT4_HT_TRUNCATE | nofail, depth + 1, ext4_free_metadata_revoke_credits(inode->i_sb, depth)); if (IS_ERR(handle)) @@ -2877,7 +2878,7 @@ int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, */ lblk = ex_end + 1; err = ext4_ext_search_right(inode, path, &lblk, &pblk, - NULL); + NULL, nofail); if (err < 0) goto out; if (pblk) { @@ -2899,10 +2900,6 @@ int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, } else { path = kcalloc(depth + 1, sizeof(struct ext4_ext_path), GFP_NOFS | __GFP_NOFAIL); - if (path == NULL) { - ext4_journal_stop(handle); - return -ENOMEM; - } path[0].p_maxdepth = path[0].p_depth = depth; path[0].p_hdr = ext_inode_hdr(inode); i = 0; @@ -2955,7 +2952,7 @@ int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, memset(path + i + 1, 0, sizeof(*path)); bh = read_extent_tree_block(inode, ext4_idx_pblock(path[i].p_idx), depth - i - 1, - EXT4_EX_NOCACHE); + EXT4_EX_NOCACHE | nofail); if (IS_ERR(bh)) { /* should we reset i_size? */ err = PTR_ERR(bh); @@ -4186,7 +4183,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, if (err) goto out; ar.lright = map->m_lblk; - err = ext4_ext_search_right(inode, path, &ar.lright, &ar.pright, &ex2); + err = ext4_ext_search_right(inode, path, &ar.lright, &ar.pright, &ex2, 0); if (err < 0) goto out; @@ -4368,23 +4365,13 @@ int ext4_ext_truncate(handle_t *handle, struct inode *inode) last_block = (inode->i_size + sb->s_blocksize - 1) >> EXT4_BLOCK_SIZE_BITS(sb); -retry: err = ext4_es_remove_extent(inode, last_block, - EXT_MAX_BLOCKS - last_block); - if (err == -ENOMEM) { - cond_resched(); - congestion_wait(BLK_RW_ASYNC, HZ/50); - goto retry; - } + EXT_MAX_BLOCKS - last_block, + EXT4_EX_NOFAIL); if (err) return err; -retry_remove_space: - err = ext4_ext_remove_space(inode, last_block, EXT_MAX_BLOCKS - 1); - if (err == -ENOMEM) { - cond_resched(); - congestion_wait(BLK_RW_ASYNC, HZ/50); - goto retry_remove_space; - } + err = ext4_ext_remove_space(inode, last_block, EXT_MAX_BLOCKS - 1, + EXT4_EX_NOFAIL); return err; } @@ -5322,13 +5309,13 @@ static int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len) ext4_discard_preallocations(inode, 0); ret = ext4_es_remove_extent(inode, punch_start, - EXT_MAX_BLOCKS - punch_start); + EXT_MAX_BLOCKS - punch_start, 0); if (ret) { up_write(&EXT4_I(inode)->i_data_sem); goto out_stop; } - ret = ext4_ext_remove_space(inode, punch_start, punch_stop - 1); + ret = ext4_ext_remove_space(inode, punch_start, punch_stop - 1, 0); if (ret) { up_write(&EXT4_I(inode)->i_data_sem); goto out_stop; @@ -5510,7 +5497,7 @@ static int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len) } ret = ext4_es_remove_extent(inode, offset_lblk, - EXT_MAX_BLOCKS - offset_lblk); + EXT_MAX_BLOCKS - offset_lblk, 0); if (ret) { up_write(&EXT4_I(inode)->i_data_sem); goto out_stop; @@ -5574,10 +5561,10 @@ ext4_swap_extents(handle_t *handle, struct inode *inode1, BUG_ON(!inode_is_locked(inode1)); BUG_ON(!inode_is_locked(inode2)); - *erp = ext4_es_remove_extent(inode1, lblk1, count); + *erp = ext4_es_remove_extent(inode1, lblk1, count, 0); if (unlikely(*erp)) return 0; - *erp = ext4_es_remove_extent(inode2, lblk2, count); + *erp = ext4_es_remove_extent(inode2, lblk2, count, 0); if (unlikely(*erp)) return 0; diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c index 9a3a8996aacf..7f7711a2ea44 100644 --- a/fs/ext4/extents_status.c +++ b/fs/ext4/extents_status.c @@ -144,9 +144,10 @@ static struct kmem_cache *ext4_es_cachep; static struct kmem_cache *ext4_pending_cachep; -static int __es_insert_extent(struct inode *inode, struct extent_status *newes); +static int __es_insert_extent(struct inode *inode, struct extent_status *newes, + int nofail); static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk, - ext4_lblk_t end, int *reserved); + ext4_lblk_t end, int *reserved, int nofail); static int es_reclaim_extents(struct ext4_inode_info *ei, int *nr_to_scan); static int __es_shrink(struct ext4_sb_info *sbi, int nr_to_scan, struct ext4_inode_info *locked_ei); @@ -452,10 +453,11 @@ static void ext4_es_list_del(struct inode *inode) static struct extent_status * ext4_es_alloc_extent(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len, - ext4_fsblk_t pblk) + ext4_fsblk_t pblk, int nofail) { struct extent_status *es; - es = kmem_cache_alloc(ext4_es_cachep, GFP_ATOMIC); + es = kmem_cache_alloc(ext4_es_cachep, + GFP_ATOMIC | (nofail ? __GFP_NOFAIL : 0)); if (es == NULL) return NULL; es->es_lblk = lblk; @@ -754,7 +756,8 @@ static inline void ext4_es_insert_extent_check(struct inode *inode, } #endif -static int __es_insert_extent(struct inode *inode, struct extent_status *newes) +static int __es_insert_extent(struct inode *inode, struct extent_status *newes, + int nofail) { struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree; struct rb_node **p = &tree->root.rb_node; @@ -795,7 +798,7 @@ static int __es_insert_extent(struct inode *inode, struct extent_status *newes) } es = ext4_es_alloc_extent(inode, newes->es_lblk, newes->es_len, - newes->es_pblk); + newes->es_pblk, nofail); if (!es) return -ENOMEM; rb_link_node(&es->rb_node, parent, p); @@ -848,11 +851,11 @@ int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk, ext4_es_insert_extent_check(inode, &newes); write_lock(&EXT4_I(inode)->i_es_lock); - err = __es_remove_extent(inode, lblk, end, NULL); + err = __es_remove_extent(inode, lblk, end, NULL, 0); if (err != 0) goto error; retry: - err = __es_insert_extent(inode, &newes); + err = __es_insert_extent(inode, &newes, 0); if (err == -ENOMEM && __es_shrink(EXT4_SB(inode->i_sb), 128, EXT4_I(inode))) goto retry; @@ -902,7 +905,7 @@ void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk, es = __es_tree_search(&EXT4_I(inode)->i_es_tree.root, lblk); if (!es || es->es_lblk > end) - __es_insert_extent(inode, &newes); + __es_insert_extent(inode, &newes, 0); write_unlock(&EXT4_I(inode)->i_es_lock); } @@ -1294,6 +1297,7 @@ static unsigned int get_rsvd(struct inode *inode, ext4_lblk_t end, * @lblk - first block in range * @end - last block in range * @reserved - number of cluster reservations released + * @nofail - EXT4_EX_NOFAIL if __GFP_NOFAIL should be used * * If @reserved is not NULL and delayed allocation is enabled, counts * block/cluster reservations freed by removing range and if bigalloc @@ -1301,7 +1305,7 @@ static unsigned int get_rsvd(struct inode *inode, ext4_lblk_t end, * error code on failure. */ static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk, - ext4_lblk_t end, int *reserved) + ext4_lblk_t end, int *reserved, int nofail) { struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree; struct rb_node *node; @@ -1350,7 +1354,7 @@ static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk, orig_es.es_len - len2; ext4_es_store_pblock_status(&newes, block, ext4_es_status(&orig_es)); - err = __es_insert_extent(inode, &newes); + err = __es_insert_extent(inode, &newes, nofail); if (err) { es->es_lblk = orig_es.es_lblk; es->es_len = orig_es.es_len; @@ -1426,12 +1430,13 @@ static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk, * @inode - file containing range * @lblk - first block in range * @len - number of blocks to remove + * @nofail - EXT4_EX_NOFAIL if __GFP_NOFAIL should be used * * Reduces block/cluster reservation count and for bigalloc cancels pending * reservations as needed. Returns 0 on success, error code on failure. */ int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk, - ext4_lblk_t len) + ext4_lblk_t len, int nofail) { ext4_lblk_t end; int err = 0; @@ -1456,7 +1461,7 @@ int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk, * is reclaimed. */ write_lock(&EXT4_I(inode)->i_es_lock); - err = __es_remove_extent(inode, lblk, end, &reserved); + err = __es_remove_extent(inode, lblk, end, &reserved, nofail); write_unlock(&EXT4_I(inode)->i_es_lock); ext4_es_print_tree(inode); ext4_da_release_space(inode, reserved); @@ -2003,11 +2008,11 @@ int ext4_es_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk, write_lock(&EXT4_I(inode)->i_es_lock); - err = __es_remove_extent(inode, lblk, lblk, NULL); + err = __es_remove_extent(inode, lblk, lblk, NULL, 0); if (err != 0) goto error; retry: - err = __es_insert_extent(inode, &newes); + err = __es_insert_extent(inode, &newes, 0); if (err == -ENOMEM && __es_shrink(EXT4_SB(inode->i_sb), 128, EXT4_I(inode))) goto retry; diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h index 4ec30a798260..23d77094a165 100644 --- a/fs/ext4/extents_status.h +++ b/fs/ext4/extents_status.h @@ -134,7 +134,7 @@ extern void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len, ext4_fsblk_t pblk, unsigned int status); extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk, - ext4_lblk_t len); + ext4_lblk_t len, int nofail); extern void ext4_es_find_extent_range(struct inode *inode, int (*match_fn)(struct extent_status *es), ext4_lblk_t lblk, ext4_lblk_t end, diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c index 89efa78ed4b2..910e87aea7be 100644 --- a/fs/ext4/indirect.c +++ b/fs/ext4/indirect.c @@ -1125,7 +1125,7 @@ void ext4_ind_truncate(handle_t *handle, struct inode *inode) return; } - ext4_es_remove_extent(inode, last_block, EXT_MAX_BLOCKS - last_block); + ext4_es_remove_extent(inode, last_block, EXT_MAX_BLOCKS - last_block, 0); /* * The orphan list entry will now protect us from any crash which diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index d18852d6029c..24246043d94b 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -1575,7 +1575,7 @@ static void mpage_release_unused_pages(struct mpage_da_data *mpd, ext4_lblk_t start, last; start = index << (PAGE_SHIFT - inode->i_blkbits); last = end << (PAGE_SHIFT - inode->i_blkbits); - ext4_es_remove_extent(inode, start, last - start + 1); + ext4_es_remove_extent(inode, start, last - start + 1, 0); } pagevec_init(&pvec); @@ -4109,7 +4109,7 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length) ext4_discard_preallocations(inode, 0); ret = ext4_es_remove_extent(inode, first_block, - stop_block - first_block); + stop_block - first_block, 0); if (ret) { up_write(&EXT4_I(inode)->i_data_sem); goto out_stop; @@ -4117,7 +4117,7 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length) if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) ret = ext4_ext_remove_space(inode, first_block, - stop_block - 1); + stop_block - 1, 0); else ret = ext4_ind_remove_space(handle, inode, first_block, stop_block); diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index 606dee9e08a3..e4de05a6b976 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -79,8 +79,8 @@ static void swap_inode_data(struct inode *inode1, struct inode *inode2) (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP); ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP); swap(ei1->i_disksize, ei2->i_disksize); - ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS); - ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS); + ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS, 0); + ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS, 0); isize = i_size_read(inode1); i_size_write(inode1, i_size_read(inode2)); diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 0775950ee84e..947e8376a35a 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1393,7 +1393,7 @@ void ext4_clear_inode(struct inode *inode) invalidate_inode_buffers(inode); clear_inode(inode); ext4_discard_preallocations(inode, 0); - ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS); + ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS, 0); dquot_drop(inode); if (EXT4_I(inode)->jinode) { jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode), diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index 6a3caedd2285..23e0f003d43b 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -476,9 +476,9 @@ static int start_this_handle(journal_t *journal, handle_t *handle, } /* Allocate a new handle. This should probably be in a slab... */ -static handle_t *new_handle(int nblocks) +static handle_t *new_handle(int nblocks, gfp_t gfp) { - handle_t *handle = jbd2_alloc_handle(GFP_NOFS); + handle_t *handle = jbd2_alloc_handle(gfp); if (!handle) return NULL; handle->h_total_credits = nblocks; @@ -505,13 +505,13 @@ handle_t *jbd2__journal_start(journal_t *journal, int nblocks, int rsv_blocks, nblocks += DIV_ROUND_UP(revoke_records, journal->j_revoke_records_per_block); - handle = new_handle(nblocks); + handle = new_handle(nblocks, gfp_mask); if (!handle) return ERR_PTR(-ENOMEM); if (rsv_blocks) { handle_t *rsv_handle; - rsv_handle = new_handle(rsv_blocks); + rsv_handle = new_handle(rsv_blocks, gfp_mask); if (!rsv_handle) { jbd2_free_handle(handle); return ERR_PTR(-ENOMEM);