On Mon, Feb 20, 2017 at 11:20:33AM +0800, Qu Wenruo wrote:
>
>
> At 02/18/2017 09:28 AM, Liu Bo wrote:
> > We have similar code here and there, this merges them into a helper.
> >
> > Signed-off-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
>
> Looks good overall.
>
> Although small nitpick inlined below.
Thank you for going through this.
> > ---
> > fs/btrfs/extent_io.c | 3 +-
> > fs/btrfs/volumes.c | 163 +++++++++++++++++----------------------------------
> > fs/btrfs/volumes.h | 2 +-
> > 3 files changed, 57 insertions(+), 111 deletions(-)
> >
> > diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
> > index 4ac383a..609ece1 100644
> > --- a/fs/btrfs/extent_io.c
> > +++ b/fs/btrfs/extent_io.c
> > @@ -2007,14 +2007,13 @@ int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
> > u64 map_length = 0;
> > u64 sector;
> > struct btrfs_bio *bbio = NULL;
> > - struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
> > int ret;
> >
> > ASSERT(!(fs_info->sb->s_flags & MS_RDONLY));
> > BUG_ON(!mirror_num);
> >
> > /* we can't repair anything in raid56 yet */
> > - if (btrfs_is_parity_mirror(map_tree, logical, length, mirror_num))
> > + if (btrfs_is_parity_mirror(fs_info, logical, length, mirror_num))
>
> Not sure if such small parameter cleanup can be split into a separate patch.
> At least it's less related to the get_chunk_map() helper.
>
But it's not a cleanup, it is get_chunk_map() that needs @fs_info.
> > return 0;
> >
> > bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
> > diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> > index 3c3c69c..c52b0fe 100644
> > --- a/fs/btrfs/volumes.c
> > +++ b/fs/btrfs/volumes.c
> > @@ -2794,10 +2794,38 @@ static int btrfs_del_sys_chunk(struct btrfs_fs_info *fs_info,
> > return ret;
> > }
> >
> > +static struct extent_map *get_chunk_map(struct btrfs_fs_info *fs_info,
> > + u64 logical, u64 length)
> > +{
> > + struct extent_map_tree *em_tree;
> > + struct extent_map *em;
> > +
> > + em_tree = &fs_info->mapping_tree.map_tree;
> > + read_lock(&em_tree->lock);
> > + em = lookup_extent_mapping(em_tree, logical, length);
> > + read_unlock(&em_tree->lock);
> > +
> > + if (!em) {
> > + btrfs_crit(fs_info, "unable to find logical %llu len %llu",
> > + logical, length);
>
> Nice error message, would be quite helpful when we hit some bug later.
>
> > + return ERR_PTR(-EINVAL);
>
> Normally I'd return -ENOENT, not sure what's the correct return here though.
>
So I tried to be consistent with the error handling of other places of searching
chunk mapping tree.
I think EINVAL makes sense here, either @logical or @length is not valid.
> > + }
> > +
> > + if (em->start > logical || em->start + em->len < logical) {
> > + btrfs_crit(fs_info,
> > + "found a bad mapping, wanted %llu, found %llu-%llu",
> > + logical, em->start, em->start + em->len);
>
> Better outputting @length also.
>
OK, I'll update it with @length.
Thanks,
-liubo
> Thanks,
> Qu
>
> > + free_extent_map(em);
> > + return ERR_PTR(-EINVAL);
> > + }
> > +
> > + /* callers are responsible for dropping em's ref. */
> > + return em;
> > +}
> > +
> > int btrfs_remove_chunk(struct btrfs_trans_handle *trans,
> > struct btrfs_fs_info *fs_info, u64 chunk_offset)
> > {
> > - struct extent_map_tree *em_tree;
> > struct extent_map *em;
> > struct map_lookup *map;
> > u64 dev_extent_len = 0;
> > @@ -2805,23 +2833,15 @@ int btrfs_remove_chunk(struct btrfs_trans_handle *trans,
> > int i, ret = 0;
> > struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
> >
> > - em_tree = &fs_info->mapping_tree.map_tree;
> > -
> > - read_lock(&em_tree->lock);
> > - em = lookup_extent_mapping(em_tree, chunk_offset, 1);
> > - read_unlock(&em_tree->lock);
> > -
> > - if (!em || em->start > chunk_offset ||
> > - em->start + em->len < chunk_offset) {
> > + em = get_chunk_map(fs_info, chunk_offset, 1);
> > + if (IS_ERR(em)) {
> > /*
> > * This is a logic error, but we don't want to just rely on the
> > * user having built with ASSERT enabled, so if ASSERT doesn't
> > * do anything we still error out.
> > */
> > ASSERT(0);
> > - if (em)
> > - free_extent_map(em);
> > - return -EINVAL;
> > + return PTR_ERR(em);
> > }
> > map = em->map_lookup;
> > mutex_lock(&fs_info->chunk_mutex);
> > @@ -4888,7 +4908,6 @@ int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
> > struct btrfs_device *device;
> > struct btrfs_chunk *chunk;
> > struct btrfs_stripe *stripe;
> > - struct extent_map_tree *em_tree;
> > struct extent_map *em;
> > struct map_lookup *map;
> > size_t item_size;
> > @@ -4897,24 +4916,9 @@ int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
> > int i = 0;
> > int ret = 0;
> >
> > - em_tree = &fs_info->mapping_tree.map_tree;
> > - read_lock(&em_tree->lock);
> > - em = lookup_extent_mapping(em_tree, chunk_offset, chunk_size);
> > - read_unlock(&em_tree->lock);
> > -
> > - if (!em) {
> > - btrfs_crit(fs_info, "unable to find logical %Lu len %Lu",
> > - chunk_offset, chunk_size);
> > - return -EINVAL;
> > - }
> > -
> > - if (em->start != chunk_offset || em->len != chunk_size) {
> > - btrfs_crit(fs_info,
> > - "found a bad mapping, wanted %Lu-%Lu, found %Lu-%Lu",
> > - chunk_offset, chunk_size, em->start, em->len);
> > - free_extent_map(em);
> > - return -EINVAL;
> > - }
> > + em = get_chunk_map(fs_info, chunk_offset, chunk_size);
> > + if (IS_ERR(em))
> > + return PTR_ERR(em);
> >
> > map = em->map_lookup;
> > item_size = btrfs_chunk_item_size(map->num_stripes);
> > @@ -5057,15 +5061,12 @@ int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset)
> > {
> > struct extent_map *em;
> > struct map_lookup *map;
> > - struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
> > int readonly = 0;
> > int miss_ndevs = 0;
> > int i;
> >
> > - read_lock(&map_tree->map_tree.lock);
> > - em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1);
> > - read_unlock(&map_tree->map_tree.lock);
> > - if (!em)
> > + em = get_chunk_map(fs_info, chunk_offset, 1);
> > + if (IS_ERR(em))
> > return 1;
> >
> > map = em->map_lookup;
> > @@ -5119,34 +5120,19 @@ void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree)
> >
> > int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
> > {
> > - struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
> > struct extent_map *em;
> > struct map_lookup *map;
> > - struct extent_map_tree *em_tree = &map_tree->map_tree;
> > int ret;
> >
> > - read_lock(&em_tree->lock);
> > - em = lookup_extent_mapping(em_tree, logical, len);
> > - read_unlock(&em_tree->lock);
> > -
> > - /*
> > - * We could return errors for these cases, but that could get ugly and
> > - * we'd probably do the same thing which is just not do anything else
> > - * and exit, so return 1 so the callers don't try to use other copies.
> > - */
> > - if (!em) {
> > - btrfs_crit(fs_info, "No mapping for %Lu-%Lu", logical,
> > - logical+len);
> > - return 1;
> > - }
> > -
> > - if (em->start > logical || em->start + em->len < logical) {
> > - btrfs_crit(fs_info, "Invalid mapping for %Lu-%Lu, got %Lu-%Lu",
> > - logical, logical+len, em->start,
> > - em->start + em->len);
> > - free_extent_map(em);
> > + em = get_chunk_map(fs_info, logical, len);
> > + if (IS_ERR(em))
> > + /*
> > + * We could return errors for these cases, but that could get
> > + * ugly and we'd probably do the same thing which is just not do
> > + * anything else and exit, so return 1 so the callers don't try
> > + * to use other copies.
> > + */
> > return 1;
> > - }
> >
> > map = em->map_lookup;
> > if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1))
> > @@ -5175,15 +5161,11 @@ unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
> > {
> > struct extent_map *em;
> > struct map_lookup *map;
> > - struct extent_map_tree *em_tree = &map_tree->map_tree;
> > unsigned long len = fs_info->sectorsize;
> >
> > - read_lock(&em_tree->lock);
> > - em = lookup_extent_mapping(em_tree, logical, len);
> > - read_unlock(&em_tree->lock);
> > - BUG_ON(!em);
> > + em = get_chunk_map(fs_info, logical, len);
> > + BUG_ON(IS_ERR(em));
> >
> > - BUG_ON(em->start > logical || em->start + em->len < logical);
> > map = em->map_lookup;
> > if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK)
> > len = map->stripe_len * nr_data_stripes(map);
> > @@ -5191,20 +5173,16 @@ unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
> > return len;
> > }
> >
> > -int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
> > +int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
> > u64 logical, u64 len, int mirror_num)
> > {
> > struct extent_map *em;
> > struct map_lookup *map;
> > - struct extent_map_tree *em_tree = &map_tree->map_tree;
> > int ret = 0;
> >
> > - read_lock(&em_tree->lock);
> > - em = lookup_extent_mapping(em_tree, logical, len);
> > - read_unlock(&em_tree->lock);
> > - BUG_ON(!em);
> > + em = get_chunk_map(fs_info, logical, len);
> > + BUG_ON(IS_ERR(em));
> >
> > - BUG_ON(em->start > logical || em->start + em->len < logical);
> > map = em->map_lookup;
> > if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK)
> > ret = 1;
> > @@ -5324,8 +5302,6 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
> > {
> > struct extent_map *em;
> > struct map_lookup *map;
> > - struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
> > - struct extent_map_tree *em_tree = &map_tree->map_tree;
> > u64 offset;
> > u64 stripe_offset;
> > u64 stripe_end_offset;
> > @@ -5347,23 +5323,9 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
> > u64 physical_to_patch_in_first_stripe = 0;
> > u64 raid56_full_stripe_start = (u64)-1;
> >
> > - read_lock(&em_tree->lock);
> > - em = lookup_extent_mapping(em_tree, logical, *length);
> > - read_unlock(&em_tree->lock);
> > -
> > - if (!em) {
> > - btrfs_crit(fs_info, "unable to find logical %llu len %llu",
> > - logical, *length);
> > - return -EINVAL;
> > - }
> > -
> > - if (em->start > logical || em->start + em->len < logical) {
> > - btrfs_crit(fs_info,
> > - "found a bad mapping, wanted %Lu, found %Lu-%Lu",
> > - logical, em->start, em->start + em->len);
> > - free_extent_map(em);
> > - return -EINVAL;
> > - }
> > + em = get_chunk_map(fs_info, logical, *length);
> > + if (IS_ERR(em))
> > + return PTR_ERR(em);
> >
> > map = em->map_lookup;
> > offset = logical - em->start;
> > @@ -5899,8 +5861,6 @@ int btrfs_rmap_block(struct btrfs_fs_info *fs_info,
> > u64 chunk_start, u64 physical, u64 devid,
> > u64 **logical, int *naddrs, int *stripe_len)
> > {
> > - struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
> > - struct extent_map_tree *em_tree = &map_tree->map_tree;
> > struct extent_map *em;
> > struct map_lookup *map;
> > u64 *buf;
> > @@ -5910,24 +5870,11 @@ int btrfs_rmap_block(struct btrfs_fs_info *fs_info,
> > u64 rmap_len;
> > int i, j, nr = 0;
> >
> > - read_lock(&em_tree->lock);
> > - em = lookup_extent_mapping(em_tree, chunk_start, 1);
> > - read_unlock(&em_tree->lock);
> > -
> > - if (!em) {
> > - btrfs_err(fs_info, "couldn't find em for chunk %Lu",
> > - chunk_start);
> > + em = get_chunk_map(fs_info, chunk_start, 1);
> > + if (IS_ERR(em))
> > return -EIO;
> > - }
> >
> > - if (em->start != chunk_start) {
> > - btrfs_err(fs_info, "bad chunk start, em=%Lu, wanted=%Lu",
> > - em->start, chunk_start);
> > - free_extent_map(em);
> > - return -EIO;
> > - }
> > map = em->map_lookup;
> > -
> > length = em->len;
> > rmap_len = map->stripe_len;
> >
> > diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
> > index 24ba6bc..bd5f6cd 100644
> > --- a/fs/btrfs/volumes.h
> > +++ b/fs/btrfs/volumes.h
> > @@ -475,7 +475,7 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
> > void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
> > struct btrfs_device *tgtdev);
> > void btrfs_scratch_superblocks(struct block_device *bdev, char *device_path);
> > -int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
> > +int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
> > u64 logical, u64 len, int mirror_num);
> > unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
> > struct btrfs_mapping_tree *map_tree,
> >
>
>
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