Baokun Li (2): erofs: fix lockdep false positives on initializing erofs_pseudo_mnt erofs: get rid of erofs_fs_context
Christian Brauner (1): erofs: reliably distinguish block based and fscache mode
Gao Xiang (1): erofs: drop experimental warning for FSDAX
fs/erofs/fscache.c | 15 ++++- fs/erofs/internal.h | 8 --- fs/erofs/super.c | 155 ++++++++++++++++---------------------------- 3 files changed, 70 insertions(+), 108 deletions(-)
From: Gao Xiang hsiangkao@linux.alibaba.com
mainline inclusion from mainline-v6.9-rc2 commit a97b59ed796804612468a3fb0ac2a5567a100a7a category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9LL1P
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
--------------------------------
As EXT4/XFS filesystems, FSDAX functionality is considered to be stable. Let's drop this warning.
Reviewed-by: Jingbo Xu jefflexu@linux.alibaba.com Signed-off-by: Gao Xiang hsiangkao@linux.alibaba.com Link: https://lore.kernel.org/r/20240325005116.106351-1-hsiangkao@linux.alibaba.co... Signed-off-by: Baokun Li libaokun1@huawei.com --- fs/erofs/super.c | 1 - 1 file changed, 1 deletion(-)
diff --git a/fs/erofs/super.c b/fs/erofs/super.c index 4e1ca3698768..b0a98dbbdf79 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -427,7 +427,6 @@ static bool erofs_fc_set_dax_mode(struct fs_context *fc, unsigned int mode)
switch (mode) { case EROFS_MOUNT_DAX_ALWAYS: - warnfc(fc, "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); set_opt(&ctx->opt, DAX_ALWAYS); clear_opt(&ctx->opt, DAX_NEVER); return true;
mainline inclusion from mainline-v6.9-rc1 commit 0f28be64d132aaf95d06375c8002ad9ecea69d71 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9LL1P
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Lockdep reported the following issue when mounting erofs with a domain_id:
============================================ WARNING: possible recursive locking detected 6.8.0-rc7-xfstests #521 Not tainted -------------------------------------------- mount/396 is trying to acquire lock: ffff907a8aaaa0e0 (&type->s_umount_key#50/1){+.+.}-{3:3}, at: alloc_super+0xe3/0x3d0
but task is already holding lock: ffff907a8aaa90e0 (&type->s_umount_key#50/1){+.+.}-{3:3}, at: alloc_super+0xe3/0x3d0
other info that might help us debug this: Possible unsafe locking scenario:
CPU0 ---- lock(&type->s_umount_key#50/1); lock(&type->s_umount_key#50/1);
*** DEADLOCK ***
May be due to missing lock nesting notation
2 locks held by mount/396: #0: ffff907a8aaa90e0 (&type->s_umount_key#50/1){+.+.}-{3:3}, at: alloc_super+0xe3/0x3d0 #1: ffffffffc00e6f28 (erofs_domain_list_lock){+.+.}-{3:3}, at: erofs_fscache_register_fs+0x3d/0x270 [erofs]
stack backtrace: CPU: 1 PID: 396 Comm: mount Not tainted 6.8.0-rc7-xfstests #521 Call Trace: <TASK> dump_stack_lvl+0x64/0xb0 validate_chain+0x5c4/0xa00 __lock_acquire+0x6a9/0xd50 lock_acquire+0xcd/0x2b0 down_write_nested+0x45/0xd0 alloc_super+0xe3/0x3d0 sget_fc+0x62/0x2f0 vfs_get_super+0x21/0x90 vfs_get_tree+0x2c/0xf0 fc_mount+0x12/0x40 vfs_kern_mount.part.0+0x75/0x90 kern_mount+0x24/0x40 erofs_fscache_register_fs+0x1ef/0x270 [erofs] erofs_fc_fill_super+0x213/0x380 [erofs]
This is because the file_system_type of both erofs and the pseudo-mount point of domain_id is erofs_fs_type, so two successive calls to alloc_super() are considered to be using the same lock and trigger the warning above.
Therefore add a nodev file_system_type called erofs_anon_fs_type in fscache.c to silence this complaint. Because kern_mount() takes a pointer to struct file_system_type, not its (string) name. So we don't need to call register_filesystem(). In addition, call init_pseudo() in erofs_anon_init_fs_context() as suggested by Al Viro, so that we can remove erofs_fc_fill_pseudo_super(), erofs_fc_anon_get_tree(), and erofs_anon_context_ops.
Suggested-by: Al Viro viro@zeniv.linux.org.uk Fixes: a9849560c55e ("erofs: introduce a pseudo mnt to manage shared cookies") Signed-off-by: Baokun Li libaokun1@huawei.com Reviewed-and-tested-by: Jingbo Xu jefflexu@linux.alibaba.com Reviewed-by: Yang Erkun yangerkun@huawei.com Link: https://lore.kernel.org/r/20240307101018.2021925-1-libaokun1@huawei.com Signed-off-by: Gao Xiang hsiangkao@linux.alibaba.com Signed-off-by: Baokun Li libaokun1@huawei.com --- fs/erofs/fscache.c | 15 ++++++++++++++- fs/erofs/internal.h | 1 - fs/erofs/super.c | 30 +----------------------------- 3 files changed, 15 insertions(+), 31 deletions(-)
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c index 1052f75d1dfa..afc37c9029ce 100644 --- a/fs/erofs/fscache.c +++ b/fs/erofs/fscache.c @@ -3,6 +3,7 @@ * Copyright (C) 2022, Alibaba Cloud * Copyright (C) 2022, Bytedance Inc. All rights reserved. */ +#include <linux/pseudo_fs.h> #include <linux/fscache.h> #include "internal.h"
@@ -12,6 +13,18 @@ static LIST_HEAD(erofs_domain_list); static LIST_HEAD(erofs_domain_cookies_list); static struct vfsmount *erofs_pseudo_mnt;
+static int erofs_anon_init_fs_context(struct fs_context *fc) +{ + return init_pseudo(fc, EROFS_SUPER_MAGIC) ? 0 : -ENOMEM; +} + +static struct file_system_type erofs_anon_fs_type = { + .owner = THIS_MODULE, + .name = "pseudo_erofs", + .init_fs_context = erofs_anon_init_fs_context, + .kill_sb = kill_anon_super, +}; + struct erofs_fscache_request { struct erofs_fscache_request *primary; struct netfs_cache_resources cache_resources; @@ -381,7 +394,7 @@ static int erofs_fscache_init_domain(struct super_block *sb) goto out;
if (!erofs_pseudo_mnt) { - struct vfsmount *mnt = kern_mount(&erofs_fs_type); + struct vfsmount *mnt = kern_mount(&erofs_anon_fs_type); if (IS_ERR(mnt)) { err = PTR_ERR(mnt); goto out; diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index eb062f19b766..1a4fe9f60295 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -385,7 +385,6 @@ struct erofs_map_dev { unsigned int m_deviceid; };
-extern struct file_system_type erofs_fs_type; extern const struct super_operations erofs_sops;
extern const struct address_space_operations erofs_raw_access_aops; diff --git a/fs/erofs/super.c b/fs/erofs/super.c index b0a98dbbdf79..f4184cde9dd1 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -574,13 +574,6 @@ static const struct export_operations erofs_export_ops = { .get_parent = erofs_get_parent, };
-static int erofs_fc_fill_pseudo_super(struct super_block *sb, struct fs_context *fc) -{ - static const struct tree_descr empty_descr = {""}; - - return simple_fill_super(sb, EROFS_SUPER_MAGIC, &empty_descr); -} - static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc) { struct inode *inode; @@ -707,11 +700,6 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc) return 0; }
-static int erofs_fc_anon_get_tree(struct fs_context *fc) -{ - return get_tree_nodev(fc, erofs_fc_fill_pseudo_super); -} - static int erofs_fc_get_tree(struct fs_context *fc) { struct erofs_fs_context *ctx = fc->fs_private; @@ -784,20 +772,10 @@ static const struct fs_context_operations erofs_context_ops = { .free = erofs_fc_free, };
-static const struct fs_context_operations erofs_anon_context_ops = { - .get_tree = erofs_fc_anon_get_tree, -}; - static int erofs_init_fs_context(struct fs_context *fc) { struct erofs_fs_context *ctx;
- /* pseudo mount for anon inodes */ - if (fc->sb_flags & SB_KERNMOUNT) { - fc->ops = &erofs_anon_context_ops; - return 0; - } - ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); if (!ctx) return -ENOMEM; @@ -819,12 +797,6 @@ static void erofs_kill_sb(struct super_block *sb) { struct erofs_sb_info *sbi;
- /* pseudo mount for anon inodes */ - if (sb->s_flags & SB_KERNMOUNT) { - kill_anon_super(sb); - return; - } - if (erofs_is_fscache_mode(sb)) kill_anon_super(sb); else @@ -863,7 +835,7 @@ static void erofs_put_super(struct super_block *sb) erofs_fscache_unregister_fs(sb); }
-struct file_system_type erofs_fs_type = { +static struct file_system_type erofs_fs_type = { .owner = THIS_MODULE, .name = "erofs", .init_fs_context = erofs_init_fs_context,
mainline inclusion from mainline-v6.9-rc7 commit 07abe43a28b2c660f726d66f5470f7f114f9643a category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9LL1P
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
--------------------------------
Instead of allocating the erofs_sb_info in fill_super() allocate it during erofs_init_fs_context() and ensure that erofs can always have the info available during erofs_kill_sb(). After this erofs_fs_context is no longer needed, replace ctx with sbi, no functional changes.
Suggested-by: Jingbo Xu jefflexu@linux.alibaba.com Signed-off-by: Baokun Li libaokun1@huawei.com Reviewed-by: Jingbo Xu jefflexu@linux.alibaba.com Reviewed-by: Gao Xiang hsiangkao@linux.alibaba.com Reviewed-by: Chao Yu chao@kernel.org Link: https://lore.kernel.org/r/20240419123611.947084-2-libaokun1@huawei.com Signed-off-by: Gao Xiang hsiangkao@linux.alibaba.com Signed-off-by: Baokun Li libaokun1@huawei.com --- fs/erofs/internal.h | 7 --- fs/erofs/super.c | 116 ++++++++++++++++++++------------------------ 2 files changed, 53 insertions(+), 70 deletions(-)
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index 1a4fe9f60295..787cc9ff9029 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -82,13 +82,6 @@ struct erofs_dev_context { bool flatdev; };
-struct erofs_fs_context { - struct erofs_mount_opts opt; - struct erofs_dev_context *devs; - char *fsid; - char *domain_id; -}; - /* all filesystem-wide lz4 configurations */ struct erofs_sb_lz4_info { /* # of pages needed for EROFS lz4 rolling decompression */ diff --git a/fs/erofs/super.c b/fs/erofs/super.c index f4184cde9dd1..693d03cffb11 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -367,18 +367,18 @@ static int erofs_read_superblock(struct super_block *sb) return ret; }
-static void erofs_default_options(struct erofs_fs_context *ctx) +static void erofs_default_options(struct erofs_sb_info *sbi) { #ifdef CONFIG_EROFS_FS_ZIP - ctx->opt.cache_strategy = EROFS_ZIP_CACHE_READAROUND; - ctx->opt.max_sync_decompress_pages = 3; - ctx->opt.sync_decompress = EROFS_SYNC_DECOMPRESS_AUTO; + sbi->opt.cache_strategy = EROFS_ZIP_CACHE_READAROUND; + sbi->opt.max_sync_decompress_pages = 3; + sbi->opt.sync_decompress = EROFS_SYNC_DECOMPRESS_AUTO; #endif #ifdef CONFIG_EROFS_FS_XATTR - set_opt(&ctx->opt, XATTR_USER); + set_opt(&sbi->opt, XATTR_USER); #endif #ifdef CONFIG_EROFS_FS_POSIX_ACL - set_opt(&ctx->opt, POSIX_ACL); + set_opt(&sbi->opt, POSIX_ACL); #endif }
@@ -423,16 +423,16 @@ static const struct fs_parameter_spec erofs_fs_parameters[] = { static bool erofs_fc_set_dax_mode(struct fs_context *fc, unsigned int mode) { #ifdef CONFIG_FS_DAX - struct erofs_fs_context *ctx = fc->fs_private; + struct erofs_sb_info *sbi = fc->s_fs_info;
switch (mode) { case EROFS_MOUNT_DAX_ALWAYS: - set_opt(&ctx->opt, DAX_ALWAYS); - clear_opt(&ctx->opt, DAX_NEVER); + set_opt(&sbi->opt, DAX_ALWAYS); + clear_opt(&sbi->opt, DAX_NEVER); return true; case EROFS_MOUNT_DAX_NEVER: - set_opt(&ctx->opt, DAX_NEVER); - clear_opt(&ctx->opt, DAX_ALWAYS); + set_opt(&sbi->opt, DAX_NEVER); + clear_opt(&sbi->opt, DAX_ALWAYS); return true; default: DBG_BUGON(1); @@ -447,7 +447,7 @@ static bool erofs_fc_set_dax_mode(struct fs_context *fc, unsigned int mode) static int erofs_fc_parse_param(struct fs_context *fc, struct fs_parameter *param) { - struct erofs_fs_context *ctx = fc->fs_private; + struct erofs_sb_info *sbi = fc->s_fs_info; struct fs_parse_result result; struct erofs_device_info *dif; int opt, ret; @@ -460,9 +460,9 @@ static int erofs_fc_parse_param(struct fs_context *fc, case Opt_user_xattr: #ifdef CONFIG_EROFS_FS_XATTR if (result.boolean) - set_opt(&ctx->opt, XATTR_USER); + set_opt(&sbi->opt, XATTR_USER); else - clear_opt(&ctx->opt, XATTR_USER); + clear_opt(&sbi->opt, XATTR_USER); #else errorfc(fc, "{,no}user_xattr options not supported"); #endif @@ -470,16 +470,16 @@ static int erofs_fc_parse_param(struct fs_context *fc, case Opt_acl: #ifdef CONFIG_EROFS_FS_POSIX_ACL if (result.boolean) - set_opt(&ctx->opt, POSIX_ACL); + set_opt(&sbi->opt, POSIX_ACL); else - clear_opt(&ctx->opt, POSIX_ACL); + clear_opt(&sbi->opt, POSIX_ACL); #else errorfc(fc, "{,no}acl options not supported"); #endif break; case Opt_cache_strategy: #ifdef CONFIG_EROFS_FS_ZIP - ctx->opt.cache_strategy = result.uint_32; + sbi->opt.cache_strategy = result.uint_32; #else errorfc(fc, "compression not supported, cache_strategy ignored"); #endif @@ -501,27 +501,27 @@ static int erofs_fc_parse_param(struct fs_context *fc, kfree(dif); return -ENOMEM; } - down_write(&ctx->devs->rwsem); - ret = idr_alloc(&ctx->devs->tree, dif, 0, 0, GFP_KERNEL); - up_write(&ctx->devs->rwsem); + down_write(&sbi->devs->rwsem); + ret = idr_alloc(&sbi->devs->tree, dif, 0, 0, GFP_KERNEL); + up_write(&sbi->devs->rwsem); if (ret < 0) { kfree(dif->path); kfree(dif); return ret; } - ++ctx->devs->extra_devices; + ++sbi->devs->extra_devices; break; #ifdef CONFIG_EROFS_FS_ONDEMAND case Opt_fsid: - kfree(ctx->fsid); - ctx->fsid = kstrdup(param->string, GFP_KERNEL); - if (!ctx->fsid) + kfree(sbi->fsid); + sbi->fsid = kstrdup(param->string, GFP_KERNEL); + if (!sbi->fsid) return -ENOMEM; break; case Opt_domain_id: - kfree(ctx->domain_id); - ctx->domain_id = kstrdup(param->string, GFP_KERNEL); - if (!ctx->domain_id) + kfree(sbi->domain_id); + sbi->domain_id = kstrdup(param->string, GFP_KERNEL); + if (!sbi->domain_id) return -ENOMEM; break; #else @@ -577,8 +577,7 @@ static const struct export_operations erofs_export_ops = { static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc) { struct inode *inode; - struct erofs_sb_info *sbi; - struct erofs_fs_context *ctx = fc->fs_private; + struct erofs_sb_info *sbi = EROFS_SB(sb); int err;
sb->s_magic = EROFS_SUPER_MAGIC; @@ -586,19 +585,6 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc) sb->s_maxbytes = MAX_LFS_FILESIZE; sb->s_op = &erofs_sops;
- sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); - if (!sbi) - return -ENOMEM; - - sb->s_fs_info = sbi; - sbi->opt = ctx->opt; - sbi->devs = ctx->devs; - ctx->devs = NULL; - sbi->fsid = ctx->fsid; - ctx->fsid = NULL; - sbi->domain_id = ctx->domain_id; - ctx->domain_id = NULL; - sbi->blkszbits = PAGE_SHIFT; if (erofs_is_fscache_mode(sb)) { sb->s_blocksize = PAGE_SIZE; @@ -702,9 +688,9 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
static int erofs_fc_get_tree(struct fs_context *fc) { - struct erofs_fs_context *ctx = fc->fs_private; + struct erofs_sb_info *sbi = fc->s_fs_info;
- if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && ctx->fsid) + if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && sbi->fsid) return get_tree_nodev(fc, erofs_fc_fill_super);
return get_tree_bdev(fc, erofs_fc_fill_super); @@ -714,19 +700,19 @@ static int erofs_fc_reconfigure(struct fs_context *fc) { struct super_block *sb = fc->root->d_sb; struct erofs_sb_info *sbi = EROFS_SB(sb); - struct erofs_fs_context *ctx = fc->fs_private; + struct erofs_sb_info *new_sbi = fc->s_fs_info;
DBG_BUGON(!sb_rdonly(sb));
- if (ctx->fsid || ctx->domain_id) + if (new_sbi->fsid || new_sbi->domain_id) erofs_info(sb, "ignoring reconfiguration for fsid|domain_id.");
- if (test_opt(&ctx->opt, POSIX_ACL)) + if (test_opt(&new_sbi->opt, POSIX_ACL)) fc->sb_flags |= SB_POSIXACL; else fc->sb_flags &= ~SB_POSIXACL;
- sbi->opt = ctx->opt; + sbi->opt = new_sbi->opt;
fc->sb_flags |= SB_RDONLY; return 0; @@ -757,12 +743,15 @@ static void erofs_free_dev_context(struct erofs_dev_context *devs)
static void erofs_fc_free(struct fs_context *fc) { - struct erofs_fs_context *ctx = fc->fs_private; + struct erofs_sb_info *sbi = fc->s_fs_info; + + if (!sbi) + return;
- erofs_free_dev_context(ctx->devs); - kfree(ctx->fsid); - kfree(ctx->domain_id); - kfree(ctx); + erofs_free_dev_context(sbi->devs); + kfree(sbi->fsid); + kfree(sbi->domain_id); + kfree(sbi); }
static const struct fs_context_operations erofs_context_ops = { @@ -774,21 +763,22 @@ static const struct fs_context_operations erofs_context_ops = {
static int erofs_init_fs_context(struct fs_context *fc) { - struct erofs_fs_context *ctx; + struct erofs_sb_info *sbi;
- ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); - if (!ctx) + sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); + if (!sbi) return -ENOMEM; - ctx->devs = kzalloc(sizeof(struct erofs_dev_context), GFP_KERNEL); - if (!ctx->devs) { - kfree(ctx); + + sbi->devs = kzalloc(sizeof(struct erofs_dev_context), GFP_KERNEL); + if (!sbi->devs) { + kfree(sbi); return -ENOMEM; } - fc->fs_private = ctx; + fc->s_fs_info = sbi;
- idr_init(&ctx->devs->tree); - init_rwsem(&ctx->devs->rwsem); - erofs_default_options(ctx); + idr_init(&sbi->devs->tree); + init_rwsem(&sbi->devs->rwsem); + erofs_default_options(sbi); fc->ops = &erofs_context_ops; return 0; }
From: Christian Brauner brauner@kernel.org
mainline inclusion from mainline-v6.9-rc7 commit 7af2ae1b1531feab5d38ec9c8f472dc6cceb4606 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9LL1P
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
--------------------------------
When erofs_kill_sb() is called in block dev based mode, s_bdev may not have been initialised yet, and if CONFIG_EROFS_FS_ONDEMAND is enabled, it will be mistaken for fscache mode, and then attempt to free an anon_dev that has never been allocated, triggering the following warning:
============================================ ida_free called for id=0 which is not allocated. WARNING: CPU: 14 PID: 926 at lib/idr.c:525 ida_free+0x134/0x140 Modules linked in: CPU: 14 PID: 926 Comm: mount Not tainted 6.9.0-rc3-dirty #630 RIP: 0010:ida_free+0x134/0x140 Call Trace: <TASK> erofs_kill_sb+0x81/0x90 deactivate_locked_super+0x35/0x80 get_tree_bdev+0x136/0x1e0 vfs_get_tree+0x2c/0xf0 do_new_mount+0x190/0x2f0 [...] ============================================
Now when erofs_kill_sb() is called, erofs_sb_info must have been initialised, so use sbi->fsid to distinguish between the two modes.
Signed-off-by: Christian Brauner brauner@kernel.org Signed-off-by: Baokun Li libaokun1@huawei.com Reviewed-by: Jingbo Xu jefflexu@linux.alibaba.com Reviewed-by: Gao Xiang hsiangkao@linux.alibaba.com Reviewed-by: Chao Yu chao@kernel.org Link: https://lore.kernel.org/r/20240419123611.947084-3-libaokun1@huawei.com Signed-off-by: Gao Xiang hsiangkao@linux.alibaba.com Signed-off-by: Baokun Li libaokun1@huawei.com --- fs/erofs/super.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/fs/erofs/super.c b/fs/erofs/super.c index 693d03cffb11..5b9903f96b23 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -785,17 +785,13 @@ static int erofs_init_fs_context(struct fs_context *fc)
static void erofs_kill_sb(struct super_block *sb) { - struct erofs_sb_info *sbi; + struct erofs_sb_info *sbi = EROFS_SB(sb);
- if (erofs_is_fscache_mode(sb)) + if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && sbi->fsid) kill_anon_super(sb); else kill_block_super(sb);
- sbi = EROFS_SB(sb); - if (!sbi) - return; - erofs_free_dev_context(sbi->devs); fs_put_dax(sbi->dax_dev, NULL); erofs_fscache_unregister_fs(sb);
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