From: Beata Michalska Subject: [RFC v2 3/4] ext4: Add support for generic FS events Date: Mon, 27 Apr 2015 13:51:43 +0200 Message-ID: <1430135504-24334-4-git-send-email-b.michalska@samsung.com> References: <1430135504-24334-1-git-send-email-b.michalska@samsung.com> Cc: jack@suse.cz, tytso@mit.edu, adilger.kernel@dilger.ca, hughd@google.com, lczerner@redhat.com, hch@infradead.org, linux-ext4@vger.kernel.org, linux-mm@kvack.org, kyungmin.park@samsung.com, kmpark@infradead.org To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Return-path: In-reply-to: <1430135504-24334-1-git-send-email-b.michalska@samsung.com> Sender: owner-linux-mm@kvack.org List-Id: linux-ext4.vger.kernel.org Add support for generic FS events including threshold notifications, ENOSPC and remount as read-only warnings, along with generic internal warnings/errors. Signed-off-by: Beata Michalska --- fs/ext4/balloc.c | 10 ++++++++-- fs/ext4/ext4.h | 1 + fs/ext4/inode.c | 2 +- fs/ext4/mballoc.c | 6 +++++- fs/ext4/resize.c | 1 + fs/ext4/super.c | 39 +++++++++++++++++++++++++++++++++++++++ 6 files changed, 55 insertions(+), 4 deletions(-) diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c index e95b27a..a48450f 100644 --- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -569,6 +569,7 @@ int ext4_claim_free_clusters(struct ext4_sb_info *sbi, { if (ext4_has_free_clusters(sbi, nclusters, flags)) { percpu_counter_add(&sbi->s_dirtyclusters_counter, nclusters); + fs_event_alloc_space(sbi->s_sb, EXT4_C2B(sbi, nclusters)); return 0; } else return -ENOSPC; @@ -590,9 +591,10 @@ int ext4_should_retry_alloc(struct super_block *sb, int *retries) { if (!ext4_has_free_clusters(EXT4_SB(sb), 1, 0) || (*retries)++ > 3 || - !EXT4_SB(sb)->s_journal) + !EXT4_SB(sb)->s_journal) { + fs_event_notify(sb, FS_WARN_ENOSPC); return 0; - + } jbd_debug(1, "%s: retrying operation after ENOSPC\n", sb->s_id); return jbd2_journal_force_commit_nested(EXT4_SB(sb)->s_journal); @@ -637,6 +639,10 @@ ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, dquot_alloc_block_nofail(inode, EXT4_C2B(EXT4_SB(inode->i_sb), ar.len)); } + + if (*errp == -ENOSPC) + fs_event_notify(inode->i_sb, FS_WARN_ENOSPC_META); + return ret; } diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 163afe2..7d75ff9 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2542,6 +2542,7 @@ void ext4_mark_group_corrupted(struct ext4_sb_info *sbi, if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp)) percpu_counter_sub(&sbi->s_freeclusters_counter, grp->bb_free); set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state); + fs_event_alloc_space(sbi->s_sb, EXT4_C2B(sbi, grp->bb_free)); } /* diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 5cb9a21..2a7af0f 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -1238,7 +1238,7 @@ static void ext4_da_release_space(struct inode *inode, int to_free) percpu_counter_sub(&sbi->s_dirtyclusters_counter, to_free); spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); - + fs_event_free_space(sbi->s_sb, to_free); dquot_release_reservation_block(inode, EXT4_C2B(sbi, to_free)); } diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 24a4b6d..c2df6f0 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -4511,6 +4511,9 @@ out: kmem_cache_free(ext4_ac_cachep, ac); if (inquota && ar->len < inquota) dquot_free_block(ar->inode, EXT4_C2B(sbi, inquota - ar->len)); + if (reserv_clstrs && ar->len < reserv_clstrs) + fs_event_free_space(sbi->s_sb, + EXT4_C2B(sbi, reserv_clstrs - ar->len)); if (!ar->len) { if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0) /* release all the reserved blocks if non delalloc */ @@ -4848,7 +4851,7 @@ do_more: if (!(flags & EXT4_FREE_BLOCKS_NO_QUOT_UPDATE)) dquot_free_block(inode, EXT4_C2B(sbi, count_clusters)); percpu_counter_add(&sbi->s_freeclusters_counter, count_clusters); - + fs_event_free_space(sb, EXT4_C2B(sbi, count_clusters)); ext4_mb_unload_buddy(&e4b); /* We dirtied the bitmap block */ @@ -4982,6 +4985,7 @@ int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, ext4_unlock_group(sb, block_group); percpu_counter_add(&sbi->s_freeclusters_counter, EXT4_NUM_B2C(sbi, blocks_freed)); + fs_event_free_space(sb, blocks_freed); if (sbi->s_log_groups_per_flex) { ext4_group_t flex_group = ext4_flex_group(sbi, block_group); diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 8a8ec62..dbf08d6 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1378,6 +1378,7 @@ static void ext4_update_super(struct super_block *sb, EXT4_NUM_B2C(sbi, free_blocks)); percpu_counter_add(&sbi->s_freeinodes_counter, EXT4_INODES_PER_GROUP(sb) * flex_gd->count); + fs_event_free_space(sb, free_blocks - reserved_blocks); ext4_debug("free blocks count %llu", percpu_counter_read(&sbi->s_freeclusters_counter)); diff --git a/fs/ext4/super.c b/fs/ext4/super.c index e061e66..108b667 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -585,6 +585,8 @@ void __ext4_abort(struct super_block *sb, const char *function, if (EXT4_SB(sb)->s_journal) jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); save_error_info(sb, function, line); + fs_event_notify(sb, FS_ERR_REMOUNT_RO); + } if (test_opt(sb, ERRORS_PANIC)) panic("EXT4-fs panic from previous error\n"); @@ -1083,6 +1085,12 @@ static const struct quotactl_ops ext4_qctl_operations = { }; #endif +static void ext4_trace_query(struct super_block *sb, u64 *ncount); + +static const struct fs_trace_operations ext4_trace_ops = { + .query = ext4_trace_query, +}; + static const struct super_operations ext4_sops = { .alloc_inode = ext4_alloc_inode, .destroy_inode = ext4_destroy_inode, @@ -3398,11 +3406,20 @@ static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count) { ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >> sbi->s_cluster_bits; + ext4_fsblk_t current_resv; if (count >= clusters) return -EINVAL; + current_resv = atomic64_read(&sbi->s_resv_clusters); atomic64_set(&sbi->s_resv_clusters, count); + + if (count > current_resv) + fs_event_alloc_space(sbi->s_sb, + EXT4_C2B(sbi, count - current_resv)); + else + fs_event_free_space(sbi->s_sb, + EXT4_C2B(sbi, current_resv - count)); return 0; } @@ -3966,6 +3983,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) sb->s_qcop = &ext4_qctl_operations; sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; #endif + sb->s_etrace.ops = &ext4_trace_ops; + sb->s_etrace.events_cap_mask = FS_EVENTS_ALL; + memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ @@ -5438,6 +5458,25 @@ out: #endif +static void ext4_trace_query(struct super_block *sb, u64 *ncount) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_super_block *es = sbi->s_es; + ext4_fsblk_t rsv_blocks; + ext4_fsblk_t nblocks; + + nblocks = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) - + percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter); + nblocks = EXT4_C2B(sbi, nblocks); + rsv_blocks = ext4_r_blocks_count(es) + + EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters)); + if (nblocks < rsv_blocks) + nblocks = 0; + else + nblocks -= rsv_blocks; + *ncount = nblocks; +} + static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { -- 1.7.9.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. 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