* [PATCH] f2fs: expose resizable_tail feature via sysfs
@ 2026-10-14 15:21 ` Daeho Jeong
0 siblings, 0 replies; 4+ messages in thread
From: Daeho Jeong @ 2026-10-14 15:21 UTC (permalink / raw)
To: linux-kernel, linux-f2fs-devel, kernel-team; +Cc: Daeho Jeong, stable
From: Daeho Jeong <daehojeong@google.com>
Userspace has no way to know whether the kernel supports the
resizable_tail_secno mount option before mounting. Passing it to a
kernel without the support fails the mount with -EINVAL, and checking
/sys/fs/f2fs/<disk>/pinned_area_max_secno requires an f2fs instance
to be mounted already.
Export /sys/fs/f2fs/features/resizable_tail so that userspace can check
the support before formatting or mounting a filesystem that relies on
resizable_tail_secno, e.g. a filesystem whose tail is going to be shrunk
online later.
Fixes: c966d29e01bb ("f2fs: support resizable tail section and unify pinned allocation")
Cc: stable@vger.kernel.org
Signed-off-by: Daeho Jeong <daehojeong@google.com>
---
Documentation/ABI/testing/sysfs-fs-f2fs | 2 +-
fs/f2fs/sysfs.c | 2 ++
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index c4746c416ac..8df18b5d479 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -271,7 +271,7 @@ Description: Shows all enabled kernel features.
inode_crtime, lost_found, verity, sb_checksum,
casefold, readonly, compression, test_dummy_encryption_v2,
atomic_write, pin_file, encrypted_casefold, linear_lookup,
- fserror.
+ fserror, resizable_tail.
What: /sys/fs/f2fs/<disk>/inject_rate
Date: May 2016
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 9749da70089..8b844a8b0bf 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -1421,6 +1421,7 @@ F2FS_FEATURE_RO_ATTR(linear_lookup);
#endif
F2FS_FEATURE_RO_ATTR(packed_ssa);
F2FS_FEATURE_RO_ATTR(fserror);
+F2FS_FEATURE_RO_ATTR(resizable_tail);
#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
static struct attribute *f2fs_attrs[] = {
@@ -1592,6 +1593,7 @@ static struct attribute *f2fs_feat_attrs[] = {
#endif
BASE_ATTR_LIST(packed_ssa),
BASE_ATTR_LIST(fserror),
+ BASE_ATTR_LIST(resizable_tail),
NULL,
};
ATTRIBUTE_GROUPS(f2fs_feat);
--
2.56.0.385.gd3acb90ef8-goog
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [f2fs-dev] [PATCH] f2fs: expose resizable_tail feature via sysfs
@ 2026-10-14 15:21 ` Daeho Jeong
0 siblings, 0 replies; 4+ messages in thread
From: Daeho Jeong @ 2026-10-14 15:21 UTC (permalink / raw)
To: linux-kernel, linux-f2fs-devel, kernel-team; +Cc: Daeho Jeong, stable
From: Daeho Jeong <daehojeong@google.com>
Userspace has no way to know whether the kernel supports the
resizable_tail_secno mount option before mounting. Passing it to a
kernel without the support fails the mount with -EINVAL, and checking
/sys/fs/f2fs/<disk>/pinned_area_max_secno requires an f2fs instance
to be mounted already.
Export /sys/fs/f2fs/features/resizable_tail so that userspace can check
the support before formatting or mounting a filesystem that relies on
resizable_tail_secno, e.g. a filesystem whose tail is going to be shrunk
online later.
Fixes: c966d29e01bb ("f2fs: support resizable tail section and unify pinned allocation")
Cc: stable@vger.kernel.org
Signed-off-by: Daeho Jeong <daehojeong@google.com>
---
Documentation/ABI/testing/sysfs-fs-f2fs | 2 +-
fs/f2fs/sysfs.c | 2 ++
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index c4746c416ac..8df18b5d479 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -271,7 +271,7 @@ Description: Shows all enabled kernel features.
inode_crtime, lost_found, verity, sb_checksum,
casefold, readonly, compression, test_dummy_encryption_v2,
atomic_write, pin_file, encrypted_casefold, linear_lookup,
- fserror.
+ fserror, resizable_tail.
What: /sys/fs/f2fs/<disk>/inject_rate
Date: May 2016
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 9749da70089..8b844a8b0bf 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -1421,6 +1421,7 @@ F2FS_FEATURE_RO_ATTR(linear_lookup);
#endif
F2FS_FEATURE_RO_ATTR(packed_ssa);
F2FS_FEATURE_RO_ATTR(fserror);
+F2FS_FEATURE_RO_ATTR(resizable_tail);
#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
static struct attribute *f2fs_attrs[] = {
@@ -1592,6 +1593,7 @@ static struct attribute *f2fs_feat_attrs[] = {
#endif
BASE_ATTR_LIST(packed_ssa),
BASE_ATTR_LIST(fserror),
+ BASE_ATTR_LIST(resizable_tail),
NULL,
};
ATTRIBUTE_GROUPS(f2fs_feat);
--
2.56.0.385.gd3acb90ef8-goog
_______________________________________________
Linux-f2fs-devel mailing list
Linux-f2fs-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] f2fs: expose resizable_tail feature via sysfs
2026-10-14 15:21 ` [f2fs-dev] " Daeho Jeong
@ 2026-10-14 21:03 ` Daeho Jeong
-1 siblings, 0 replies; 4+ messages in thread
From: Daeho Jeong @ 2026-10-14 21:03 UTC (permalink / raw)
To: linux-kernel, linux-f2fs-devel, kernel-team
Cc: Daeho Jeong, stable, Daniel Zheng
+ cc: zhengdaniel@google.com
On Wed, Oct 14, 2026 at 8:21 AM Daeho Jeong <daeho43@gmail.com> wrote:
>
> From: Daeho Jeong <daehojeong@google.com>
>
> Userspace has no way to know whether the kernel supports the
> resizable_tail_secno mount option before mounting. Passing it to a
> kernel without the support fails the mount with -EINVAL, and checking
> /sys/fs/f2fs/<disk>/pinned_area_max_secno requires an f2fs instance
> to be mounted already.
>
> Export /sys/fs/f2fs/features/resizable_tail so that userspace can check
> the support before formatting or mounting a filesystem that relies on
> resizable_tail_secno, e.g. a filesystem whose tail is going to be shrunk
> online later.
>
> Fixes: c966d29e01bb ("f2fs: support resizable tail section and unify pinned allocation")
> Cc: stable@vger.kernel.org
> Signed-off-by: Daeho Jeong <daehojeong@google.com>
> ---
> Documentation/ABI/testing/sysfs-fs-f2fs | 2 +-
> fs/f2fs/sysfs.c | 2 ++
> 2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> index c4746c416ac..8df18b5d479 100644
> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> @@ -271,7 +271,7 @@ Description: Shows all enabled kernel features.
> inode_crtime, lost_found, verity, sb_checksum,
> casefold, readonly, compression, test_dummy_encryption_v2,
> atomic_write, pin_file, encrypted_casefold, linear_lookup,
> - fserror.
> + fserror, resizable_tail.
>
> What: /sys/fs/f2fs/<disk>/inject_rate
> Date: May 2016
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index 9749da70089..8b844a8b0bf 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -1421,6 +1421,7 @@ F2FS_FEATURE_RO_ATTR(linear_lookup);
> #endif
> F2FS_FEATURE_RO_ATTR(packed_ssa);
> F2FS_FEATURE_RO_ATTR(fserror);
> +F2FS_FEATURE_RO_ATTR(resizable_tail);
>
> #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
> static struct attribute *f2fs_attrs[] = {
> @@ -1592,6 +1593,7 @@ static struct attribute *f2fs_feat_attrs[] = {
> #endif
> BASE_ATTR_LIST(packed_ssa),
> BASE_ATTR_LIST(fserror),
> + BASE_ATTR_LIST(resizable_tail),
> NULL,
> };
> ATTRIBUTE_GROUPS(f2fs_feat);
> --
> 2.56.0.385.gd3acb90ef8-goog
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [f2fs-dev] [PATCH] f2fs: expose resizable_tail feature via sysfs
@ 2026-10-14 21:03 ` Daeho Jeong
0 siblings, 0 replies; 4+ messages in thread
From: Daeho Jeong @ 2026-10-14 21:03 UTC (permalink / raw)
To: linux-kernel, linux-f2fs-devel, kernel-team
Cc: Daeho Jeong, stable, Daniel Zheng
+ cc: zhengdaniel@google.com
On Wed, Oct 14, 2026 at 8:21 AM Daeho Jeong <daeho43@gmail.com> wrote:
>
> From: Daeho Jeong <daehojeong@google.com>
>
> Userspace has no way to know whether the kernel supports the
> resizable_tail_secno mount option before mounting. Passing it to a
> kernel without the support fails the mount with -EINVAL, and checking
> /sys/fs/f2fs/<disk>/pinned_area_max_secno requires an f2fs instance
> to be mounted already.
>
> Export /sys/fs/f2fs/features/resizable_tail so that userspace can check
> the support before formatting or mounting a filesystem that relies on
> resizable_tail_secno, e.g. a filesystem whose tail is going to be shrunk
> online later.
>
> Fixes: c966d29e01bb ("f2fs: support resizable tail section and unify pinned allocation")
> Cc: stable@vger.kernel.org
> Signed-off-by: Daeho Jeong <daehojeong@google.com>
> ---
> Documentation/ABI/testing/sysfs-fs-f2fs | 2 +-
> fs/f2fs/sysfs.c | 2 ++
> 2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> index c4746c416ac..8df18b5d479 100644
> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> @@ -271,7 +271,7 @@ Description: Shows all enabled kernel features.
> inode_crtime, lost_found, verity, sb_checksum,
> casefold, readonly, compression, test_dummy_encryption_v2,
> atomic_write, pin_file, encrypted_casefold, linear_lookup,
> - fserror.
> + fserror, resizable_tail.
>
> What: /sys/fs/f2fs/<disk>/inject_rate
> Date: May 2016
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index 9749da70089..8b844a8b0bf 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -1421,6 +1421,7 @@ F2FS_FEATURE_RO_ATTR(linear_lookup);
> #endif
> F2FS_FEATURE_RO_ATTR(packed_ssa);
> F2FS_FEATURE_RO_ATTR(fserror);
> +F2FS_FEATURE_RO_ATTR(resizable_tail);
>
> #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
> static struct attribute *f2fs_attrs[] = {
> @@ -1592,6 +1593,7 @@ static struct attribute *f2fs_feat_attrs[] = {
> #endif
> BASE_ATTR_LIST(packed_ssa),
> BASE_ATTR_LIST(fserror),
> + BASE_ATTR_LIST(resizable_tail),
> NULL,
> };
> ATTRIBUTE_GROUPS(f2fs_feat);
> --
> 2.56.0.385.gd3acb90ef8-goog
>
_______________________________________________
Linux-f2fs-devel mailing list
Linux-f2fs-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2026-10-14 21:03 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2026-10-14 15:21 [PATCH] f2fs: expose resizable_tail feature via sysfs Daeho Jeong
2026-10-14 15:21 ` [f2fs-dev] " Daeho Jeong
2026-10-14 21:03 ` Daeho Jeong
2026-10-14 21:03 ` [f2fs-dev] " Daeho Jeong
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