* [PATCH 1/2] jffs2: fix ignoring mounting options problem during remounting
@ 2020-10-14 6:54 Zhe Li
2020-10-14 6:54 ` [PATCH 2/2] jffs2: fix can't set rp_size to zero " Zhe Li
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Zhe Li @ 2020-10-14 6:54 UTC (permalink / raw)
To: dwmw2, richard
Cc: lizhe67, wangfangpeng1, zhongjubin, linux-kernel, linux-mtd,
qiuxi1, chenjie6
From: lizhe <lizhe67@huawei.com>
The jffs2 mount options will be ignored when remounting jffs2.
It can be easily reproduced with the steps listed below.
1. mount -t jffs2 -o compr=none /dev/mtdblockx /mnt
2. mount -o remount compr=zlib /mnt
Since ec10a24f10c8, the option parsing happens before fill_super and
then pass fc, which contains the options parsing results, to function
jffs2_reconfigure during remounting. But function jffs2_reconfigure do
not update c->mount_opts.
This patch add a function jffs2_update_mount_opts to fix this problem.
By the way, I notice that tmpfs use the same way to update remounting
options. If it is necessary to unify them?
Signed-off-by: lizhe <lizhe67@huawei.com>
---
fs/jffs2/super.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index 05d7878dfad1..4fd297bdf0f3 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -215,11 +215,28 @@ static int jffs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
return 0;
}
+static inline void jffs2_update_mount_opts(struct fs_context *fc)
+{
+ struct jffs2_sb_info *new_c = fc->s_fs_info;
+ struct jffs2_sb_info *c = JFFS2_SB_INFO(fc->root->d_sb);
+
+ mutex_lock(&c->alloc_sem);
+ if (new_c->mount_opts.override_compr) {
+ c->mount_opts.override_compr = new_c->mount_opts.override_compr;
+ c->mount_opts.compr = new_c->mount_opts.compr;
+ }
+ if (new_c->mount_opts.rp_size)
+ c->mount_opts.rp_size = new_c->mount_opts.rp_size;
+ mutex_unlock(&c->alloc_sem);
+}
+
static int jffs2_reconfigure(struct fs_context *fc)
{
struct super_block *sb = fc->root->d_sb;
sync_filesystem(sb);
+ jffs2_update_mount_opts(fc);
+
return jffs2_do_remount_fs(sb, fc);
}
--
2.12.3
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^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH 2/2] jffs2: fix can't set rp_size to zero during remounting
2020-10-14 6:54 [PATCH 1/2] jffs2: fix ignoring mounting options problem during remounting Zhe Li
@ 2020-10-14 6:54 ` Zhe Li
2020-11-19 2:50 ` Zhe Li
2020-11-06 2:30 ` [PATCH 1/2] jffs2: fix ignoring mounting options problem " Zhe Li
2020-11-10 21:34 ` Richard Weinberger
2 siblings, 1 reply; 6+ messages in thread
From: Zhe Li @ 2020-10-14 6:54 UTC (permalink / raw)
To: dwmw2, richard
Cc: lizhe67, wangfangpeng1, zhongjubin, linux-kernel, linux-mtd,
qiuxi1, chenjie6
From: lizhe <lizhe67@huawei.com>
Set rp_size to zero will be ignore during remounting.
The method to identify whether we input a remounting option of
rp_size is to check if the rp_size input is zero. It can not work
well if we pass "rp_size=0".
This patch add a bool variable "set_rp_size" to fix this problem.
By the way, the problem of NULL pointer dereference in rp_size
fs option parsing showed at
https://lore.kernel.org/linux-mtd/20201012131204.59102-1-jamie@nuviainc.com/T/#u
should be applyed before this patch to make sure it works well.
Reported-by: Jubin Zhong <zhongjubin@huawei.com>
Signed-off-by: lizhe <lizhe67@huawei.com>
---
fs/jffs2/jffs2_fs_sb.h | 1 +
fs/jffs2/super.c | 7 +++++--
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/jffs2/jffs2_fs_sb.h b/fs/jffs2/jffs2_fs_sb.h
index 778275f48a87..5a7091746f68 100644
--- a/fs/jffs2/jffs2_fs_sb.h
+++ b/fs/jffs2/jffs2_fs_sb.h
@@ -38,6 +38,7 @@ struct jffs2_mount_opts {
* users. This is implemented simply by means of not allowing the
* latter users to write to the file system if the amount if the
* available space is less then 'rp_size'. */
+ bool set_rp_size;
unsigned int rp_size;
};
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index 4fd297bdf0f3..c523adaca79f 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -88,7 +88,7 @@ static int jffs2_show_options(struct seq_file *s, struct dentry *root)
if (opts->override_compr)
seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr));
- if (opts->rp_size)
+ if (opts->set_rp_size)
seq_printf(s, ",rp_size=%u", opts->rp_size / 1024);
return 0;
@@ -206,6 +206,7 @@ static int jffs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
if (opt > c->mtd->size)
return invalf(fc, "jffs2: Too large reserve pool specified, max is %llu KB",
c->mtd->size / 1024);
+ c->mount_opts.set_rp_size = true;
c->mount_opts.rp_size = opt;
break;
default:
@@ -225,8 +226,10 @@ static inline void jffs2_update_mount_opts(struct fs_context *fc)
c->mount_opts.override_compr = new_c->mount_opts.override_compr;
c->mount_opts.compr = new_c->mount_opts.compr;
}
- if (new_c->mount_opts.rp_size)
+ if (new_c->mount_opts.set_rp_size) {
+ c->mount_opts.set_rp_size = new_c->mount_opts.set_rp_size;
c->mount_opts.rp_size = new_c->mount_opts.rp_size;
+ }
mutex_unlock(&c->alloc_sem);
}
--
2.12.3
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^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH 1/2] jffs2: fix ignoring mounting options problem during remounting
2020-10-14 6:54 [PATCH 1/2] jffs2: fix ignoring mounting options problem during remounting Zhe Li
2020-10-14 6:54 ` [PATCH 2/2] jffs2: fix can't set rp_size to zero " Zhe Li
@ 2020-11-06 2:30 ` Zhe Li
2020-11-10 21:34 ` Richard Weinberger
2 siblings, 0 replies; 6+ messages in thread
From: Zhe Li @ 2020-11-06 2:30 UTC (permalink / raw)
To: linux-mtd, lizhe67, dwmw2, richard
Cc: zhongjubin, wangfangpeng1, linux-kernel, qiuxi1, chenjie6
Maintainer ping?
Zhe
On Tue, 13 Oct 2020 15:22:37 +0800, Zhe Li wrote:
>
>The jffs2 mount options will be ignored when remounting jffs2.
>It can be easily reproduced with the steps listed below.
>1. mount -t jffs2 -o compr=none /dev/mtdblockx /mnt
>2. mount -o remount compr=zlib /mnt
>
>Since ec10a24f10c8, the option parsing happens before fill_super and
>then pass fc, which contains the options parsing results, to function
>jffs2_reconfigure during remounting. But function jffs2_reconfigure do
>not update c->mount_opts.
>
>This patch add a function jffs2_update_mount_opts to fix this problem.
>
>By the way, I notice that tmpfs use the same way to update remounting
>options. If it is necessary to unify them?
>
>Signed-off-by: lizhe <lizhe67@huawei.com>
>---
> fs/jffs2/super.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
>diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
>index 05d7878dfad1..4fd297bdf0f3 100644
>--- a/fs/jffs2/super.c
>+++ b/fs/jffs2/super.c
>@@ -215,11 +215,28 @@ static int jffs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
> return 0;
> }
>
>+static inline void jffs2_update_mount_opts(struct fs_context *fc)
>+{
>+ struct jffs2_sb_info *new_c = fc->s_fs_info;
>+ struct jffs2_sb_info *c = JFFS2_SB_INFO(fc->root->d_sb);
>+
>+ mutex_lock(&c->alloc_sem);
>+ if (new_c->mount_opts.override_compr) {
>+ c->mount_opts.override_compr = new_c->mount_opts.override_compr;
>+ c->mount_opts.compr = new_c->mount_opts.compr;
>+ }
>+ if (new_c->mount_opts.rp_size)
>+ c->mount_opts.rp_size = new_c->mount_opts.rp_size;
>+ mutex_unlock(&c->alloc_sem);
>+}
>+
> static int jffs2_reconfigure(struct fs_context *fc)
> {
> struct super_block *sb = fc->root->d_sb;
>
> sync_filesystem(sb);
>+ jffs2_update_mount_opts(fc);
>+
> return jffs2_do_remount_fs(sb, fc);
> }
>
>--
>2.12.3
>
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH 1/2] jffs2: fix ignoring mounting options problem during remounting
2020-10-14 6:54 [PATCH 1/2] jffs2: fix ignoring mounting options problem during remounting Zhe Li
2020-10-14 6:54 ` [PATCH 2/2] jffs2: fix can't set rp_size to zero " Zhe Li
2020-11-06 2:30 ` [PATCH 1/2] jffs2: fix ignoring mounting options problem " Zhe Li
@ 2020-11-10 21:34 ` Richard Weinberger
2 siblings, 0 replies; 6+ messages in thread
From: Richard Weinberger @ 2020-11-10 21:34 UTC (permalink / raw)
To: Zhe Li
Cc: qiuxi1, Richard Weinberger, LKML, linux-mtd, wangfangpeng1,
zhongjubin, David Woodhouse, chenjie6
On Wed, Oct 14, 2020 at 9:01 AM Zhe Li <lizhe67@huawei.com> wrote:
>
> From: lizhe <lizhe67@huawei.com>
>
> The jffs2 mount options will be ignored when remounting jffs2.
> It can be easily reproduced with the steps listed below.
> 1. mount -t jffs2 -o compr=none /dev/mtdblockx /mnt
> 2. mount -o remount compr=zlib /mnt
>
> Since ec10a24f10c8, the option parsing happens before fill_super and
> then pass fc, which contains the options parsing results, to function
> jffs2_reconfigure during remounting. But function jffs2_reconfigure do
> not update c->mount_opts.
>
> This patch add a function jffs2_update_mount_opts to fix this problem.
Oh, a regression. Thanks for fixing.
> By the way, I notice that tmpfs use the same way to update remounting
> options. If it is necessary to unify them?
If possible, sure. Maybe you can find a way to put the logic into fs/libfs.c
--
Thanks,
//richard
______________________________________________________
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http://lists.infradead.org/mailman/listinfo/linux-mtd/
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH 2/2] jffs2: fix can't set rp_size to zero during remounting
2020-10-14 6:54 ` [PATCH 2/2] jffs2: fix can't set rp_size to zero " Zhe Li
@ 2020-11-19 2:50 ` Zhe Li
2020-11-23 8:18 ` Richard Weinberger
0 siblings, 1 reply; 6+ messages in thread
From: Zhe Li @ 2020-11-19 2:50 UTC (permalink / raw)
To: lizhe67, richard, dwmw2
Cc: qiuxi1, zhongjubin, linux-kernel, linux-mtd, wangfangpeng1, chenjie6
Maintainer ping?
Zhe
On Tue, 13 Oct 2020 19:41:30 +0800, Zhe Li wrote:
>
>Set rp_size to zero will be ignore during remounting.
>
>The method to identify whether we input a remounting option of
>rp_size is to check if the rp_size input is zero. It can not work
>well if we pass "rp_size=0".
>
>This patch add a bool variable "set_rp_size" to fix this problem.
>
>By the way, the problem of NULL pointer dereference in rp_size
>fs option parsing showed at
>https://lore.kernel.org/linux-mtd/20201012131204.59102-1-jamie@nuviainc.com/T/#u
>should be applyed before this patch to make sure it works well.
>
>Reported-by: Jubin Zhong <zhongjubin@huawei.com>
>Signed-off-by: lizhe <lizhe67@huawei.com>
>---
> fs/jffs2/jffs2_fs_sb.h | 1 +
> fs/jffs2/super.c | 7 +++++--
> 2 files changed, 6 insertions(+), 2 deletions(-)
>
>diff --git a/fs/jffs2/jffs2_fs_sb.h b/fs/jffs2/jffs2_fs_sb.h
>index 778275f48a87..5a7091746f68 100644
>--- a/fs/jffs2/jffs2_fs_sb.h
>+++ b/fs/jffs2/jffs2_fs_sb.h
>@@ -38,6 +38,7 @@ struct jffs2_mount_opts {
> * users. This is implemented simply by means of not allowing the
> * latter users to write to the file system if the amount if the
> * available space is less then 'rp_size'. */
>+ bool set_rp_size;
> unsigned int rp_size;
> };
>
>diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
>index 4fd297bdf0f3..c523adaca79f 100644
>--- a/fs/jffs2/super.c
>+++ b/fs/jffs2/super.c
>@@ -88,7 +88,7 @@ static int jffs2_show_options(struct seq_file *s, struct dentry *root)
>
> if (opts->override_compr)
> seq_printf(s, ",compr=%s", jffs2_compr_name(opts->compr));
>- if (opts->rp_size)
>+ if (opts->set_rp_size)
> seq_printf(s, ",rp_size=%u", opts->rp_size / 1024);
>
> return 0;
>@@ -206,6 +206,7 @@ static int jffs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
> if (opt > c->mtd->size)
> return invalf(fc, "jffs2: Too large reserve pool specified, max is %llu KB",
> c->mtd->size / 1024);
>+ c->mount_opts.set_rp_size = true;
> c->mount_opts.rp_size = opt;
> break;
> default:
>@@ -225,8 +226,10 @@ static inline void jffs2_update_mount_opts(struct fs_context *fc)
> c->mount_opts.override_compr = new_c->mount_opts.override_compr;
> c->mount_opts.compr = new_c->mount_opts.compr;
> }
>- if (new_c->mount_opts.rp_size)
>+ if (new_c->mount_opts.set_rp_size) {
>+ c->mount_opts.set_rp_size = new_c->mount_opts.set_rp_size;
> c->mount_opts.rp_size = new_c->mount_opts.rp_size;
>+ }
> mutex_unlock(&c->alloc_sem);
> }
>
>--
>2.12.3
>
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH 2/2] jffs2: fix can't set rp_size to zero during remounting
2020-11-19 2:50 ` Zhe Li
@ 2020-11-23 8:18 ` Richard Weinberger
0 siblings, 0 replies; 6+ messages in thread
From: Richard Weinberger @ 2020-11-23 8:18 UTC (permalink / raw)
To: Zhe Li
Cc: wangfangpeng1, Richard Weinberger, LKML, linux-mtd, qiuxi1,
zhongjubin, David Woodhouse, chenjie6
On Thu, Nov 19, 2020 at 3:59 AM Zhe Li <lizhe67@huawei.com> wrote:
>
> Maintainer ping?
Didn't I reply to this series?
/me double checks sent folder.
--
Thanks,
//richard
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^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2020-11-23 8:20 UTC | newest]
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2020-10-14 6:54 [PATCH 1/2] jffs2: fix ignoring mounting options problem during remounting Zhe Li
2020-10-14 6:54 ` [PATCH 2/2] jffs2: fix can't set rp_size to zero " Zhe Li
2020-11-19 2:50 ` Zhe Li
2020-11-23 8:18 ` Richard Weinberger
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