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fs: explicitly unregister per-superblock BDIs
Add a new SB_I_ flag to mark superblocks that have an ephemeral bdi associated with them, and unregister it when the superblock is shut down. Link: https://lkml.kernel.org/r/20211021124441.668816-4-hch@lst.de Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Miquel Raynal <miquel.raynal@bootlin.com> Cc: Richard Weinberger <richard@nod.at> Cc: Vignesh Raghavendra <vigneshr@ti.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -476,6 +476,8 @@ void generic_shutdown_super(struct super_block *sb)
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spin_unlock(&sb_lock);
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up_write(&sb->s_umount);
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if (sb->s_bdi != &noop_backing_dev_info) {
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if (sb->s_iflags & SB_I_PERSB_BDI)
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bdi_unregister(sb->s_bdi);
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bdi_put(sb->s_bdi);
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sb->s_bdi = &noop_backing_dev_info;
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}
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@ -1562,6 +1564,7 @@ int super_setup_bdi_name(struct super_block *sb, char *fmt, ...)
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}
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WARN_ON(sb->s_bdi != &noop_backing_dev_info);
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sb->s_bdi = bdi;
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sb->s_iflags |= SB_I_PERSB_BDI;
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return 0;
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}
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@ -1443,6 +1443,7 @@ extern int send_sigurg(struct fown_struct *fown);
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#define SB_I_UNTRUSTED_MOUNTER 0x00000040
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#define SB_I_SKIP_SYNC 0x00000100 /* Skip superblock at global sync */
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#define SB_I_PERSB_BDI 0x00000200 /* has a per-sb bdi */
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/* Possible states of 'frozen' field */
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enum {
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