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Subject[PATCH 1/2] vfs: factor sb iteration out of do_emergency_remount
Date
The intent is to reduce code duplication with other code
iterating the list.

No functional changes.

Signed-off-by: Mateusz Guzik <mguzik@redhat.com>
---
fs/super.c | 61 ++++++++++++++++++++++++++++++++++++-------------------------
1 file changed, 36 insertions(+), 25 deletions(-)

diff --git a/fs/super.c b/fs/super.c
index 166c4ee..fd9c02f 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -574,6 +574,28 @@ void drop_super_exclusive(struct super_block *sb)
}
EXPORT_SYMBOL(drop_super_exclusive);

+static void __iterate_supers(void (*f)(struct super_block *))
+{
+ struct super_block *sb, *p = NULL;
+
+ spin_lock(&sb_lock);
+ list_for_each_entry(sb, &super_blocks, s_list) {
+ if (hlist_unhashed(&sb->s_instances))
+ continue;
+ sb->s_count++;
+ spin_unlock(&sb_lock);
+
+ f(sb);
+
+ spin_lock(&sb_lock);
+ if (p)
+ __put_super(p);
+ p = sb;
+ }
+ if (p)
+ __put_super(p);
+ spin_unlock(&sb_lock);
+}
/**
* iterate_supers - call function for all active superblocks
* @f: function to call
@@ -881,33 +903,22 @@ int do_remount_sb(struct super_block *sb, int sb_flags, void *data, int force)
return retval;
}

-static void do_emergency_remount(struct work_struct *work)
+static void do_emergency_remount_callback(struct super_block *sb)
{
- struct super_block *sb, *p = NULL;
-
- spin_lock(&sb_lock);
- list_for_each_entry(sb, &super_blocks, s_list) {
- if (hlist_unhashed(&sb->s_instances))
- continue;
- sb->s_count++;
- spin_unlock(&sb_lock);
- down_write(&sb->s_umount);
- if (sb->s_root && sb->s_bdev && (sb->s_flags & SB_BORN) &&
- !sb_rdonly(sb)) {
- /*
- * What lock protects sb->s_flags??
- */
- do_remount_sb(sb, SB_RDONLY, NULL, 1);
- }
- up_write(&sb->s_umount);
- spin_lock(&sb_lock);
- if (p)
- __put_super(p);
- p = sb;
+ down_write(&sb->s_umount);
+ if (sb->s_root && sb->s_bdev && (sb->s_flags & SB_BORN) &&
+ !sb_rdonly(sb)) {
+ /*
+ * What lock protects sb->s_flags??
+ */
+ do_remount_sb(sb, SB_RDONLY, NULL, 1);
}
- if (p)
- __put_super(p);
- spin_unlock(&sb_lock);
+ up_write(&sb->s_umount);
+}
+
+static void do_emergency_remount(struct work_struct *work)
+{
+ __iterate_supers(do_emergency_remount_callback);
kfree(work);
printk("Emergency Remount complete\n");
}
--
1.8.3.1
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