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UPSTREAM: f2fs: add carve_out sysfs node

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For several zoned storage devices, vendors will provide extra space
which was used for device level GC than specs and F2FS can use this
space for filesystem level GC. To do that, we can reserve the space
using reserved_blocks. However, it is not enough, since this extra
space should not be shown to users. So, with this new sysfs node,
we can hide the space by substracting reserved_blocks from total
bytes.

Change-Id: I2c98ad5d55696090d5cc1f39a8b5524bad1cf10b
Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
(cherry picked from commit d7b549def0eb42a950eebd3bd5343f5c8088c305)
This commit is contained in:
Daeho Jeong
2025-03-11 11:29:31 -07:00
committed by Carlos Llamas
parent afaedae56f
commit d622ce5107
4 changed files with 17 additions and 1 deletions
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Documentation/ABI/testing/sysfs-fs-f2fs
+10
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@@ -836,3 +836,13 @@ Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
Description: It reclaims the given KBs of file-backed pages registered by
ioctl(F2FS_IOC_DONATE_RANGE).
For example, writing N tries to drop N KBs spaces in LRU.
What: /sys/fs/f2fs/<disk>/carve_out
Date: March 2025
Contact: "Daeho Jeong" <daehojeong@google.com>
Description: For several zoned storage devices, vendors will provide extra space which
was used for device level GC than specs and F2FS can use this space for
filesystem level GC. To do that, we can reserve the space using
reserved_blocks. However, it is not enough, since this extra space should
not be shown to users. So, with this new sysfs node, we can hide the space
by substracting reserved_blocks from total bytes.
fs/f2fs/f2fs.h
+3
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@@ -1817,6 +1817,9 @@ struct f2fs_sb_info {
u64 committed_atomic_block;
u64 revoked_atomic_block;
/* carve out reserved_blocks from total blocks */
bool carve_out;
#ifdef CONFIG_F2FS_FS_COMPRESSION
struct kmem_cache *page_array_slab; /* page array entry */
unsigned int page_array_slab_size; /* default page array slab size */
fs/f2fs/super.c
+2 -1
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@@ -1855,7 +1855,8 @@ static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_blocks = total_count - start_count;
spin_lock(&sbi->stat_lock);
if (sbi->carve_out)
buf->f_blocks -= sbi->current_reserved_blocks;
user_block_count = sbi->user_block_count;
total_valid_node_count = valid_node_count(sbi);
avail_node_count = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
fs/f2fs/sysfs.c
+2
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@@ -1122,6 +1122,7 @@ F2FS_SBI_GENERAL_RW_ATTR(max_read_extent_count);
F2FS_SBI_GENERAL_RO_ATTR(unusable_blocks_per_sec);
F2FS_SBI_GENERAL_RW_ATTR(blkzone_alloc_policy);
#endif
F2FS_SBI_GENERAL_RW_ATTR(carve_out);
/* STAT_INFO ATTR */
#ifdef CONFIG_F2FS_STAT_FS
@@ -1309,6 +1310,7 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(warm_data_age_threshold),
ATTR_LIST(last_age_weight),
ATTR_LIST(max_read_extent_count),
ATTR_LIST(carve_out),
NULL,
};
ATTRIBUTE_GROUPS(f2fs);