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fs: Provide infrastructure for dynamic BDIs in filesystems

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Provide helper functions for setting up dynamically allocated
backing_dev_info structures for filesystems and cleaning them up on
superblock destruction.

CC: [email protected]
CC: [email protected]
CC: Petr Vandrovec <[email protected]>
CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: [email protected]
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jan Kara <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jan Kara 2017-04-12 12:24:28 +02:00 • committed by Jens Axboe
commit fca39346a5
3 changed files with 56 additions and 1 deletions
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49
fs/super.c
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@ -446,6 +446,11 @@ void generic_shutdown_super(struct super_block *sb)
hlist_del_init(&sb->s_instances);
spin_unlock(&sb_lock);
up_write(&sb->s_umount);
if (sb->s_iflags & SB_I_DYNBDI) {
bdi_put(sb->s_bdi);
sb->s_bdi = &noop_backing_dev_info;
sb->s_iflags &= ~SB_I_DYNBDI;
}
}
EXPORT_SYMBOL(generic_shutdown_super);
@ -1255,6 +1260,50 @@ out:
return ERR_PTR(error);
}
/*
* Setup private BDI for given superblock. It gets automatically cleaned up
* in generic_shutdown_super().
*/
int super_setup_bdi_name(struct super_block *sb, char *fmt, ...)
{
struct backing_dev_info *bdi;
int err;
va_list args;
bdi = bdi_alloc(GFP_KERNEL);
if (!bdi)
return -ENOMEM;
bdi->name = sb->s_type->name;
va_start(args, fmt);
err = bdi_register_va(bdi, NULL, fmt, args);
va_end(args);
if (err) {
bdi_put(bdi);
return err;
}
WARN_ON(sb->s_bdi != &noop_backing_dev_info);
sb->s_bdi = bdi;
sb->s_iflags |= SB_I_DYNBDI;
return 0;
}
EXPORT_SYMBOL(super_setup_bdi_name);
/*
* Setup private BDI for given superblock. I gets automatically cleaned up
* in generic_shutdown_super().
*/
int super_setup_bdi(struct super_block *sb)
{
static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0);
return super_setup_bdi_name(sb, "%.28s-%ld", sb->s_type->name,
atomic_long_inc_return(&bdi_seq));
}
EXPORT_SYMBOL(super_setup_bdi);
/*
* This is an internal function, please use sb_end_{write,pagefault,intwrite}
* instead.