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Add scoutfs_unmounting()

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Add a quick helper that can be used to avoid doing work if we know that
we're already shutting down.  This can be a single coarser indicator
than adding functions to each subsystem to track that we're shutting
down.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2021-08-18 11:29:38 -07:00
parent 36fcc4665d
commit 5bc95fac7d
2 changed files with 20 additions and 1 deletions
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7
kmod/src/super.c
View File

@@ -661,7 +661,12 @@ static struct dentry *scoutfs_mount(struct file_system_type *fs_type, int flags,
*/
static void scoutfs_kill_sb(struct super_block *sb)
{
trace_scoutfs_kill_sb(sb);
struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
if (sbi) {
sbi->unmounting = true;
smp_wmb();
}
if (SCOUTFS_HAS_SBI(sb))
scoutfs_lock_unmount_begin(sb);

14
kmod/src/super.h
View File

@@ -89,6 +89,7 @@ struct scoutfs_sb_info {
struct dentry *debug_root;
bool forced_unmount;
bool unmounting;
unsigned long corruption_messages_once[SC_NR_LONGS];
};
@@ -117,6 +118,19 @@ static inline bool scoutfs_forcing_unmount(struct super_block *sb)
return sbi->forced_unmount;
}
/*
* True if we're shutting down the system and can be used as a coarse
* indicator that we can avoid doing some work that no longer makes
* sense.
*/
static inline bool scoutfs_unmounting(struct super_block *sb)
{
struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
smp_rmb();
return !sbi || sbi->unmounting;
}
/*
* A small string embedded in messages that's used to identify a
* specific mount. It's the three most significant bytes of the fsid