Re: [f2fs-dev] [PATCH 1/2] f2fs: support zone capacity less than zone size

[Aravind Ramesh <Aravind.Ramesh@wdc.com>]

Please find my response inline.

Thanks,
Aravind

> -----Original Message-----
> From: Chao Yu <yuchao0@huawei.com>
> Sent: Thursday, July 9, 2020 8:26 AM
> To: Aravind Ramesh <Aravind.Ramesh@wdc.com>; jaegeuk@kernel.org; linux-
> fsdevel@vger.kernel.org; linux-f2fs-devel@lists.sourceforge.net; hch@lst.de
> Cc: Damien Le Moal <Damien.LeMoal@wdc.com>; Niklas Cassel
> <Niklas.Cassel@wdc.com>; Matias Bjorling <Matias.Bjorling@wdc.com>
> Subject: Re: [PATCH 1/2] f2fs: support zone capacity less than zone size
> 
> On 2020/7/8 21:04, Aravind Ramesh wrote:
> > Please find my response inline.
> >
> > Thanks,
> > Aravind
[snip..]
> >>>>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index
> >>>>> c35614d255e1..d2156f3f56a5 100644
> >>>>> --- a/fs/f2fs/segment.c
> >>>>> +++ b/fs/f2fs/segment.c
> >>>>> @@ -4294,9 +4294,12 @@ static void init_free_segmap(struct
> >>>>> f2fs_sb_info *sbi)  {
> >>>>>  	unsigned int start;
> >>>>>  	int type;
> >>>>> +	struct seg_entry *sentry;
> >>>>>
> >>>>>  	for (start = 0; start < MAIN_SEGS(sbi); start++) {
> >>>>> -		struct seg_entry *sentry = get_seg_entry(sbi, start);
> >>>>> +		if (f2fs_usable_blks_in_seg(sbi, start) == 0)
> >>>>
> >>>> If usable blocks count is zero, shouldn't we update
> >>>> SIT_I(sbi)->written_valid_blocks as we did when there is partial
> >>>> usable block in
> >> current segment?
> >>> If usable_block_count is zero, then it is like a dead segment, all
> >>> blocks in the segment lie after the zone-capacity in the zone. So
> >>> there can never be
> >> a valid written content on these segments, hence it is not updated.
> >>> In the other case, when a segment start before the zone-capacity and
> >>> it ends beyond zone-capacity, then there are some blocks before
> >>> zone-capacity
> >> which can be used, so they are accounted for.
> >>
> >> I'm thinking that for limit_free_user_blocks() function, it assumes
> >> all unwritten blocks as potential reclaimable blocks, however segment
> >> after zone-capacity should never be used or reclaimable, it looks calculation could
> be not correct here.
> >>
> > The sbi->user_block_count is updated with the total usable_blocks in
> > the full file system during the formatting of the file system using
> > mkfs.f2fs. Please see the f2fs-tools patch series that I have submitted along with
> this patch set.
> >
> > So sbi->user_block_count reflects the actual number of usable blocks (i.e. total
> blocks - unusable blocks).
> 
> Alright, will check both kernel and f2fs-tools change again later. :)
> 
> >
> >> static inline block_t limit_free_user_blocks(struct f2fs_sb_info *sbi) {
> >> 	block_t reclaimable_user_blocks = sbi->user_block_count -
> >> 		written_block_count(sbi);
> >> 	return (long)(reclaimable_user_blocks * LIMIT_FREE_BLOCK) / 100; }
> >>
> >> static inline bool has_enough_invalid_blocks(struct f2fs_sb_info *sbi) {
> >> 	block_t invalid_user_blocks = sbi->user_block_count -
> >> 					written_block_count(sbi);
> >> 	/*
> >> 	 * Background GC is triggered with the following conditions.
> >> 	 * 1. There are a number of invalid blocks.
> >> 	 * 2. There is not enough free space.
> >> 	 */
> >> 	if (invalid_user_blocks > limit_invalid_user_blocks(sbi) &&
> >> 			free_user_blocks(sbi) < limit_free_user_blocks(sbi))
> >>
> >> -- In this condition, free_user_blocks() doesn't include segments
> >> after zone-capacity, however limit_free_user_blocks() includes them.
> > In the second patch of this patch set, free_user_blocks is updated to account for
> the segments after zone-capacity.
> > It basically gets the free segment(segments before zone capacity and
> > free) block count and deducts the overprovision segment block count. It also
> considers the spanning segments block count into account.
> 
> Okay.
> 
> >
> >
> >>
> >> 		return true;
> >> 	return false;
> >> }
> >>
> >>
> >>>>
> >>>>> +			continue;
> >>>>> +		sentry = get_seg_entry(sbi, start);
> >>>>>  		if (!sentry->valid_blocks)
> >>>>>  			__set_free(sbi, start);
> >>>>>  		else
> >>>>> @@ -4316,7 +4319,7 @@ static void init_dirty_segmap(struct
> >>>>> f2fs_sb_info
> >> *sbi)
> >>>>>  	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
> >>>>>  	struct free_segmap_info *free_i = FREE_I(sbi);
> >>>>>  	unsigned int segno = 0, offset = 0, secno;
> >>>>> -	unsigned short valid_blocks;
> >>>>> +	unsigned short valid_blocks, usable_blks_in_seg;
> >>>>>  	unsigned short blks_per_sec = BLKS_PER_SEC(sbi);
> >>>>>
> >>>>>  	while (1) {
> >>>>> @@ -4326,9 +4329,10 @@ static void init_dirty_segmap(struct
> >>>>> f2fs_sb_info
> >> *sbi)
> >>>>>  			break;
> >>>>>  		offset = segno + 1;
> >>>>>  		valid_blocks = get_valid_blocks(sbi, segno, false);
> >>>>> -		if (valid_blocks == sbi->blocks_per_seg || !valid_blocks)
> >>>>> +		usable_blks_in_seg = f2fs_usable_blks_in_seg(sbi, segno);
> >>>>> +		if (valid_blocks == usable_blks_in_seg || !valid_blocks)
> >>>>
> >>>> It needs to traverse .cur_valid_map bitmap to check whether blocks
> >>>> in range of [0, usable_blks_in_seg] are all valid or not, if there
> >>>> is at least one usable block in the range, segment should be dirty.
> >>> For the segments which start and end before zone-capacity are just
> >>> like any
> >> normal segments.
> >>> Segments which start after the zone-capacity are fully unusable and
> >>> are marked as
> >> used in the free_seg_bitmap, so these segments are never used.
> >>> Segments which span across the zone-capacity have some unusable
> >>> blocks. Even
> >> when blocks from these segments are allocated/deallocated the
> >> valid_blocks counter is incremented/decremented, reflecting the current
> valid_blocks count.
> >>> Comparing valid_blocks count with usable_blocks count in the segment
> >>> can
> >> indicate if the segment is dirty or fully used.
> >>
> >> I thought that if there is one valid block locates in range of
> >> [usable_blks_in_seg, blks_per_seg] (after zone-capacity), the
> >> condition will be incorrect. That should never happen, right?
> > Yes, this will never happen. All blocks after zone-capacity are never usable.
> >>
> >> If so, how about adjusting check_block_count() to do sanity check on
> >> bitmap locates after zone-capacity to make sure there is no free slots there.
> >
> > Ok, I will add this check in check_block_count. It makes sense.
> >
> >>
> >>> Sorry, but could you please share why cur_valid_map needs to be traversed ?
> >>>
> >>>>
> >>>> One question, if we select dirty segment which across zone-capacity
> >>>> as opened segment (in curseg), how can we avoid allocating usable
> >>>> block beyong zone-capacity in such segment via .cur_valid_map?
> >>> For zoned devices, we have to allocate blocks sequentially, so it's
> >>> always in LFS
> >> manner it is allocated.
> >>> The __has_curseg_space() checks for the usable blocks and stops
> >>> allocating blocks
> >> after zone-capacity.
> >>
> >> Oh, that was implemented in patch 2, I haven't checked that
> >> patch...sorry, however, IMO, patch should be made to apply
> >> independently, what if do allocation only after applying patch 1..., do we need to
> merge them into one?
> > The patches were split keeping in mind that all data structure related
> > and initialization Changes would go into patch 1 and IO path and GC related
> changes in patch 2.
> > But if you think, merging them to a single patch will be easier to
> > review,
> 
> Yes, please, it's not only about easier review, but also for better maintenance of
> patches in upstream, otherwise, it's not possible to apply, backport, revert one of
> two patches independently.
> 
> I still didn't get the full picture of using such zns device which has configured zone-
> capacity, is it like?
> 1. configure zone-capacity in zns device 2. mkfs.f2fs zns device 3. mount zns device

Zone-capacity is set by the device vendor. It could be same as zone-size or less than zone-size
depending on vendor. It cannot be configured by the user. So the step 1 is not possible.
Since NVMe ZNS device zones are sequentially write only, we need another zoned device with
Conventional zones or any normal block device for the metadata operations of F2fs.
I have provided some more explanation in the cover letter of the kernel patch set on this.
Step 2 is mkfs.f2fs zns device + block device (mkfs.f2fs -m -c /dev/nvme0n1 /dev/nullb1)

A typical nvme-cli output of a zoned device shows zone start and capacity and write pointer as below:

SLBA: 0x0             WP: 0x0             Cap: 0x18800    State: EMPTY        Type: SEQWRITE_REQ   Attrs: 0x0
SLBA: 0x20000    WP: 0x20000    Cap: 0x18800    State: EMPTY        Type: SEQWRITE_REQ   Attrs: 0x0
SLBA: 0x40000    WP: 0x40000    Cap: 0x18800    State: EMPTY        Type: SEQWRITE_REQ   Attrs: 0x0

Here zone size is 64MB, capacity is 49MB, WP is at zone start as the zone is empty. Here for each zone,
only zone start + 49MB is usable area, any lba/sector after 49MB cannot be read or written to, the drive will
fail any attempts to read/write. So, the second zone starts at 64MB and is usable till 113MB (64 + 49) and the
range between 113 and 128MB is again unusable. The next zone starts at 128MB, and so on.

> 
> Can we change zone-capacity dynamically after step 2? Or we should run mkfs.f2fs
> again whenever update zone-capacity?
User cannot change zone-capacity dynamically. It is device dependent.
> 
> Thanks,
> 
> > then I shall merge it and send it as one patch in V2, along with other suggestions
> incorporated.
> >
> > Please let me know.
> >>
> >>>>
> >>>>>  			continue;
> >>>>> -		if (valid_blocks > sbi->blocks_per_seg) {
> >>>>> +		if (valid_blocks > usable_blks_in_seg) {
> >>>>>  			f2fs_bug_on(sbi, 1);
> >>>>>  			continue;
> >>>>>  		}
> >>>>> @@ -4678,6 +4682,101 @@ int f2fs_check_write_pointer(struct
> >>>>> f2fs_sb_info *sbi)
> >>>>>
> >>>>>  	return 0;
> >>>>>  }
> >>>>> +
> >>>>> +static bool is_conv_zone(struct f2fs_sb_info *sbi, unsigned int zone_idx,
> >>>>> +						unsigned int dev_idx)
> >>>>> +{
> >>>>> +	if (!bdev_is_zoned(FDEV(dev_idx).bdev))
> >>>>> +		return true;
> >>>>> +	return !test_bit(zone_idx, FDEV(dev_idx).blkz_seq); }
> >>>>> +
> >>>>> +/* Return the zone index in the given device */ static unsigned
> >>>>> +int get_zone_idx(struct f2fs_sb_info *sbi, unsigned int secno,
> >>>>> +					int dev_idx)
> >>>>> +{
> >>>>> +	block_t sec_start_blkaddr = START_BLOCK(sbi,
> >>>>> +GET_SEG_FROM_SEC(sbi, secno));
> >>>>> +
> >>>>> +	return (sec_start_blkaddr - FDEV(dev_idx).start_blk) >>
> >>>>> +						sbi->log_blocks_per_blkz;
> >>>>> +}
> >>>>> +
> >>>>> +/*
> >>>>> + * Return the usable segments in a section based on the zone's
> >>>>> + * corresponding zone capacity. Zone is equal to a section.
> >>>>> + */
> >>>>> +static inline unsigned int f2fs_usable_zone_segs_in_sec(
> >>>>> +		struct f2fs_sb_info *sbi, unsigned int segno) {
> >>>>> +	unsigned int dev_idx, zone_idx, unusable_segs_in_sec;
> >>>>> +
> >>>>> +	dev_idx = f2fs_target_device_index(sbi, START_BLOCK(sbi, segno));
> >>>>> +	zone_idx = get_zone_idx(sbi, GET_SEC_FROM_SEG(sbi, segno),
> >>>>> +dev_idx);
> >>>>> +
> >>>>> +	/* Conventional zone's capacity is always equal to zone size */
> >>>>> +	if (is_conv_zone(sbi, zone_idx, dev_idx))
> >>>>> +		return sbi->segs_per_sec;
> >>>>> +
> >>>>> +	/*
> >>>>> +	 * If the zone_capacity_blocks array is NULL, then zone capacity
> >>>>> +	 * is equal to the zone size for all zones
> >>>>> +	 */
> >>>>> +	if (!FDEV(dev_idx).zone_capacity_blocks)
> >>>>> +		return sbi->segs_per_sec;
> >>>>> +
> >>>>> +	/* Get the segment count beyond zone capacity block */
> >>>>> +	unusable_segs_in_sec = (sbi->blocks_per_blkz -
> >>>>> +
> 	FDEV(dev_idx).zone_capacity_blocks[zone_idx])
> >>>>>>
> >>>>> +				sbi->log_blocks_per_seg;
> >>>>> +	return sbi->segs_per_sec - unusable_segs_in_sec; }
> >>>>> +
> >>>>> +/*
> >>>>> + * Return the number of usable blocks in a segment. The number of
> >>>>> +blocks
> >>>>> + * returned is always equal to the number of blocks in a segment
> >>>>> +for
> >>>>> + * segments fully contained within a sequential zone capacity or
> >>>>> +a
> >>>>> + * conventional zone. For segments partially contained in a
> >>>>> +sequential
> >>>>> + * zone capacity, the number of usable blocks up to the zone
> >>>>> +capacity
> >>>>> + * is returned. 0 is returned in all other cases.
> >>>>> + */
> >>>>> +static inline unsigned int f2fs_usable_zone_blks_in_seg(
> >>>>> +			struct f2fs_sb_info *sbi, unsigned int segno) {
> >>>>> +	block_t seg_start, sec_start_blkaddr, sec_cap_blkaddr;
> >>>>> +	unsigned int zone_idx, dev_idx, secno;
> >>>>> +
> >>>>> +	secno = GET_SEC_FROM_SEG(sbi, segno);
> >>>>> +	seg_start = START_BLOCK(sbi, segno);
> >>>>> +	dev_idx = f2fs_target_device_index(sbi, seg_start);
> >>>>> +	zone_idx = get_zone_idx(sbi, secno, dev_idx);
> >>>>> +
> >>>>> +	/*
> >>>>> +	 * Conventional zone's capacity is always equal to zone size,
> >>>>> +	 * so, blocks per segment is unchanged.
> >>>>> +	 */
> >>>>> +	if (is_conv_zone(sbi, zone_idx, dev_idx))
> >>>>> +		return sbi->blocks_per_seg;
> >>>>> +
> >>>>> +	if (!FDEV(dev_idx).zone_capacity_blocks)
> >>>>> +		return sbi->blocks_per_seg;
> >>>>> +
> >>>>> +	sec_start_blkaddr = START_BLOCK(sbi, GET_SEG_FROM_SEC(sbi,
> secno));
> >>>>> +	sec_cap_blkaddr = sec_start_blkaddr +
> >>>>> +
> 	FDEV(dev_idx).zone_capacity_blocks[zone_idx];
> >>>>> +
> >>>>> +	/*
> >>>>> +	 * If segment starts before zone capacity and spans beyond
> >>>>> +	 * zone capacity, then usable blocks are from seg start to
> >>>>> +	 * zone capacity. If the segment starts after the zone capacity,
> >>>>> +	 * then there are no usable blocks.
> >>>>> +	 */
> >>>>> +	if (seg_start >= sec_cap_blkaddr)
> >>>>> +		return 0;
> >>>>> +	if (seg_start + sbi->blocks_per_seg > sec_cap_blkaddr)
> >>>>> +		return sec_cap_blkaddr - seg_start;
> >>>>> +
> >>>>> +	return sbi->blocks_per_seg;
> >>>>> +}
> >>>>>  #else
> >>>>>  int f2fs_fix_curseg_write_pointer(struct f2fs_sb_info *sbi)  { @@
> >>>>> -4688,7 +4787,36 @@ int f2fs_check_write_pointer(struct
> >>>>> f2fs_sb_info
> >>>>> *sbi)  {
> >>>>>  	return 0;
> >>>>>  }
> >>>>> +
> >>>>> +static inline unsigned int f2fs_usable_zone_blks_in_seg(struct
> >>>>> +f2fs_sb_info
> >> *sbi,
> >>>>> +							unsigned int
> segno)
> >>>>> +{
> >>>>> +	return 0;
> >>>>> +}
> >>>>> +
> >>>>> +static inline unsigned int f2fs_usable_zone_segs_in_sec(struct
> >>>>> +f2fs_sb_info
> >> *sbi,
> >>>>> +							unsigned int
> segno)
> >>>>> +{
> >>>>> +	return 0;
> >>>>> +}
> >>>>>  #endif
> >>>>> +unsigned int f2fs_usable_blks_in_seg(struct f2fs_sb_info *sbi,
> >>>>> +					unsigned int segno)
> >>>>> +{
> >>>>> +	if (f2fs_sb_has_blkzoned(sbi))
> >>>>> +		return f2fs_usable_zone_blks_in_seg(sbi, segno);
> >>>>> +
> >>>>> +	return sbi->blocks_per_seg;
> >>>>> +}
> >>>>> +
> >>>>> +unsigned int f2fs_usable_segs_in_sec(struct f2fs_sb_info *sbi,
> >>>>> +					unsigned int segno)
> >>>>> +{
> >>>>> +	if (f2fs_sb_has_blkzoned(sbi))
> >>>>> +		return f2fs_usable_zone_segs_in_sec(sbi, segno);
> >>>>> +
> >>>>> +	return sbi->segs_per_sec;
> >>>>> +}
> >>>>>
> >>>>>  /*
> >>>>>   * Update min, max modified time for cost-benefit GC algorithm
> >>>>> diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h index
> >>>>> f261e3e6a69b..79b0dc33feaf 100644
> >>>>> --- a/fs/f2fs/segment.h
> >>>>> +++ b/fs/f2fs/segment.h
> >>>>> @@ -411,6 +411,7 @@ static inline void __set_free(struct
> >>>>> f2fs_sb_info *sbi,
> >>>> unsigned int segno)
> >>>>>  	unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
> >>>>>  	unsigned int start_segno = GET_SEG_FROM_SEC(sbi, secno);
> >>>>>  	unsigned int next;
> >>>>> +	unsigned int usable_segs = f2fs_usable_segs_in_sec(sbi, segno);
> >>>>>
> >>>>>  	spin_lock(&free_i->segmap_lock);
> >>>>>  	clear_bit(segno, free_i->free_segmap); @@ -418,7 +419,7 @@
> >>>>> static inline void __set_free(struct f2fs_sb_info *sbi, unsigned
> >>>>> int segno)
> >>>>>
> >>>>>  	next = find_next_bit(free_i->free_segmap,
> >>>>>  			start_segno + sbi->segs_per_sec, start_segno);
> >>>>> -	if (next >= start_segno + sbi->segs_per_sec) {
> >>>>> +	if (next >= start_segno + usable_segs) {
> >>>>>  		clear_bit(secno, free_i->free_secmap);
> >>>>>  		free_i->free_sections++;
> >>>>>  	}
> >>>>> @@ -444,6 +445,7 @@ static inline void __set_test_and_free(struct
> >>>>> f2fs_sb_info
> >>>> *sbi,
> >>>>>  	unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
> >>>>>  	unsigned int start_segno = GET_SEG_FROM_SEC(sbi, secno);
> >>>>>  	unsigned int next;
> >>>>> +	unsigned int usable_segs = f2fs_usable_segs_in_sec(sbi, segno);
> >>>>>
> >>>>>  	spin_lock(&free_i->segmap_lock);
> >>>>>  	if (test_and_clear_bit(segno, free_i->free_segmap)) { @@ -453,7
> >>>>> +455,7 @@ static inline void __set_test_and_free(struct
> >>>>> +f2fs_sb_info *sbi,
> >>>>>  			goto skip_free;
> >>>>>  		next = find_next_bit(free_i->free_segmap,
> >>>>>  				start_segno + sbi->segs_per_sec, start_segno);
> >>>>> -		if (next >= start_segno + sbi->segs_per_sec) {
> >>>>> +		if (next >= start_segno + usable_segs) {
> >>>>>  			if (test_and_clear_bit(secno, free_i->free_secmap))
> >>>>>  				free_i->free_sections++;
> >>>>>  		}
> >>>>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index
> >>>>> 80cb7cd358f8..2686b07ae7eb 100644
> >>>>> --- a/fs/f2fs/super.c
> >>>>> +++ b/fs/f2fs/super.c
> >>>>> @@ -1164,6 +1164,7 @@ static void destroy_device_list(struct
> >>>>> f2fs_sb_info
> >> *sbi)
> >>>>>  		blkdev_put(FDEV(i).bdev, FMODE_EXCL);  #ifdef
> >>>> CONFIG_BLK_DEV_ZONED
> >>>>>  		kvfree(FDEV(i).blkz_seq);
> >>>>> +		kvfree(FDEV(i).zone_capacity_blocks);
> >>>>
> >>>> Now, f2fs_kzalloc won't allocate vmalloc's memory, so it's safe to use kfree().
> >>> Ok
> >>>>
> >>>>>  #endif
> >>>>>  	}
> >>>>>  	kvfree(sbi->devs);
> >>>>> @@ -3039,13 +3040,26 @@ static int init_percpu_info(struct
> >>>>> f2fs_sb_info *sbi)  }
> >>>>>
> >>>>>  #ifdef CONFIG_BLK_DEV_ZONED
> >>>>> +
> >>>>> +struct f2fs_report_zones_args {
> >>>>> +	struct f2fs_dev_info *dev;
> >>>>> +	bool zone_cap_mismatch;
> >>>>> +};
> >>>>> +
> >>>>>  static int f2fs_report_zone_cb(struct blk_zone *zone, unsigned int idx,
> >>>>> -			       void *data)
> >>>>> +			      void *data)
> >>>>>  {
> >>>>> -	struct f2fs_dev_info *dev = data;
> >>>>> +	struct f2fs_report_zones_args *rz_args = data;
> >>>>> +
> >>>>> +	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
> >>>>> +		return 0;
> >>>>> +
> >>>>> +	set_bit(idx, rz_args->dev->blkz_seq);
> >>>>> +	rz_args->dev->zone_capacity_blocks[idx] = zone->capacity >>
> >>>>> +
> 	F2FS_LOG_SECTORS_PER_BLOCK;
> >>>>> +	if (zone->len != zone->capacity && !rz_args->zone_cap_mismatch)
> >>>>> +		rz_args->zone_cap_mismatch = true;
> >>>>>
> >>>>> -	if (zone->type != BLK_ZONE_TYPE_CONVENTIONAL)
> >>>>> -		set_bit(idx, dev->blkz_seq);
> >>>>>  	return 0;
> >>>>>  }
> >>>>>
> >>>>> @@ -3053,6 +3067,7 @@ static int init_blkz_info(struct
> >>>>> f2fs_sb_info *sbi, int devi)  {
> >>>>>  	struct block_device *bdev = FDEV(devi).bdev;
> >>>>>  	sector_t nr_sectors = bdev->bd_part->nr_sects;
> >>>>> +	struct f2fs_report_zones_args rep_zone_arg;
> >>>>>  	int ret;
> >>>>>
> >>>>>  	if (!f2fs_sb_has_blkzoned(sbi))
> >>>>> @@ -3078,12 +3093,26 @@ static int init_blkz_info(struct
> >>>>> f2fs_sb_info *sbi, int
> >>>> devi)
> >>>>>  	if (!FDEV(devi).blkz_seq)
> >>>>>  		return -ENOMEM;
> >>>>>
> >>>>> -	/* Get block zones type */
> >>>>> +	/* Get block zones type and zone-capacity */
> >>>>> +	FDEV(devi).zone_capacity_blocks = f2fs_kzalloc(sbi,
> >>>>> +					FDEV(devi).nr_blkz *
> sizeof(block_t),
> >>>>> +					GFP_KERNEL);
> >>>>> +	if (!FDEV(devi).zone_capacity_blocks)
> >>>>> +		return -ENOMEM;
> >>>>> +
> >>>>> +	rep_zone_arg.dev = &FDEV(devi);
> >>>>> +	rep_zone_arg.zone_cap_mismatch = false;
> >>>>> +
> >>>>>  	ret = blkdev_report_zones(bdev, 0, BLK_ALL_ZONES, f2fs_report_zone_cb,
> >>>>> -				  &FDEV(devi));
> >>>>> +				  &rep_zone_arg);
> >>>>>  	if (ret < 0)
> >>>>>  		return ret;
> >>>>
> >>>> Missed to call kfree(FDEV(devi).zone_capacity_blocks)?
> >>> Thanks for catching it. Will free it here also.
> >>>>
> >>>>>
> >>>>> +	if (!rep_zone_arg.zone_cap_mismatch) {
> >>>>> +		kvfree(FDEV(devi).zone_capacity_blocks);
> >>>>
> >>>> Ditto, kfree().
> >>> Ok.
> >>>>
> >>>> Thanks,
> >>>>
> >>>>> +		FDEV(devi).zone_capacity_blocks = NULL;
> >>>>> +	}
> >>>>> +
> >>>>>  	return 0;
> >>>>>  }
> >>>>>  #endif
> >>>>>
> >>> .
> >>>
> > .
> >


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