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SubjectRe: [RFC 3/4] ext4: Add support for generic FS events
On Wed, Apr 15, 2015 at 09:15:46AM +0200, Beata Michalska wrote:
> 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 <b.michalska@samsung.com>
> ---
> fs/ext4/balloc.c | 11 +++++++++--
> fs/ext4/ext4.h | 1 +
> fs/ext4/inode.c | 2 +-
> fs/ext4/mballoc.c | 6 +++++-
> fs/ext4/resize.c | 1 +
> fs/ext4/super.c | 43 +++++++++++++++++++++++++++++++++++++++++++
> 6 files changed, 60 insertions(+), 4 deletions(-)
>
> diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
> index e95b27a..49d2ace 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_EVENT_WARN, 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 +639,11 @@ 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_EVENT_WARN,
> + FS_WANR_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));

While we're adding fs netlink notifications, could we add a message that means
"This FS is corrupt, go run fsck"? A monitoring app could possibly figure
this out by a sudden drop in free space accompanied by EIO errors hitting
userland apps, but we might as well be explicit about the flaming death. :)

--D

> }
>
> /*
> 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..e6cbbd6 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..52091da 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -398,6 +398,7 @@ static void ext4_handle_error(struct super_block *sb)
> if (test_opt(sb, ERRORS_PANIC))
> panic("EXT4-fs (device %s): panic forced after error\n",
> sb->s_id);
> + fs_event_notify(sb, FS_EVENT_ERR, FS_ERR_UNKNOWN);
> }
>
> #define ext4_error_ratelimit(sb) \
> @@ -585,6 +586,8 @@ 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_EVENT_ERR, FS_ERR_RO_REMOUT);
> +
> }
> if (test_opt(sb, ERRORS_PANIC))
> panic("EXT4-fs panic from previous error\n");
> @@ -612,6 +615,8 @@ void __ext4_warning(struct super_block *sb, const char *function,
> struct va_format vaf;
> va_list args;
>
> + fs_event_notify(sb, FS_EVENT_WARN, FS_WARN_UNKNOWN);
> +
> if (!___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
> "EXT4-fs warning"))
> return;
> @@ -1083,6 +1088,13 @@ static const struct quotactl_ops ext4_qctl_operations = {
> };
> #endif
>
> +static int ext4_trace_query(struct super_block *sb,
> + struct fs_trace_sdata *data);
> +
> +static const struct fs_trace_operations ext4_trace_ops = {
> + .fs_trace_query = ext4_trace_query,
> +};
> +
> static const struct super_operations ext4_sops = {
> .alloc_inode = ext4_alloc_inode,
> .destroy_inode = ext4_destroy_inode,
> @@ -3398,11 +3410,20 @@ 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 +3987,8 @@ 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_trace_ops = &ext4_trace_ops;
> +
> memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
>
> INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
> @@ -5438,6 +5461,26 @@ out:
>
> #endif
>
> +static int ext4_trace_query(struct super_block *sb, struct fs_trace_sdata *data)
> +{
> + struct ext4_sb_info *sbi = EXT4_SB(sb);
> + struct ext4_super_block *es = sbi->s_es;
> + ext4_fsblk_t rsv_blocks;
> +
> + data->available_blks =
> + percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
> + percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
> + data->available_blks = EXT4_C2B(sbi, data->available_blks);
> + rsv_blocks = ext4_r_blocks_count(es) +
> + EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
> + if (data->available_blks < rsv_blocks)
> + data->available_blks = 0;
> + else
> + data->available_blks -= rsv_blocks;
> + data->events_cap_mask = FS_EVENTS_ALL;
> + return 0;
> +}
> +
> static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
> const char *dev_name, void *data)
> {
> --
> 1.7.9.5
>
> --
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