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f2fs: Add option to limit required GC for checkpoint=disable

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This extends the checkpoint option to allow checkpoint=disable:%u[%]
This allows you to specify what how much of the disk you are willing
to lose access to while mounting with checkpoint=disable. If the amount
lost would be higher, the mount will return -EAGAIN. This can be given
as a percent of total space, or in blocks.

Currently, we need to run garbage collection until the amount of holes
is smaller than the OVP space. With the new option, f2fs can mark
space as unusable up front instead of requiring garbage collection until
the number of holes is small enough.

Signed-off-by: Daniel Rosenberg <drosen@google.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Daniel Rosenberg
2019-05-29 17:49:06 -07:00
committed by Jaegeuk Kim
parent a4c3ecaaad
commit 4d3aed7090
6 changed files with 99 additions and 26 deletions
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16
fs/f2fs/sysfs.c
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@@ -68,6 +68,20 @@ static ssize_t dirty_segments_show(struct f2fs_attr *a,
(unsigned long long)(dirty_segments(sbi)));
}
static ssize_t unusable_show(struct f2fs_attr *a,
struct f2fs_sb_info *sbi, char *buf)
{
block_t unusable;
if (test_opt(sbi, DISABLE_CHECKPOINT))
unusable = sbi->unusable_block_count;
else
unusable = f2fs_get_unusable_blocks(sbi);
return snprintf(buf, PAGE_SIZE, "%llu\n",
(unsigned long long)unusable);
}
static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a,
struct f2fs_sb_info *sbi, char *buf)
{
@@ -440,6 +454,7 @@ F2FS_GENERAL_RO_ATTR(dirty_segments);
F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
F2FS_GENERAL_RO_ATTR(features);
F2FS_GENERAL_RO_ATTR(current_reserved_blocks);
F2FS_GENERAL_RO_ATTR(unusable);
#ifdef CONFIG_FS_ENCRYPTION
F2FS_FEATURE_RO_ATTR(encryption, FEAT_CRYPTO);
@@ -495,6 +510,7 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(inject_type),
#endif
ATTR_LIST(dirty_segments),
ATTR_LIST(unusable),
ATTR_LIST(lifetime_write_kbytes),
ATTR_LIST(features),
ATTR_LIST(reserved_blocks),