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fs/writeback: in wait_sb_inodes(), skip wait for AS_WRITEBACK_INDETERMINATE mappings

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For filesystems with the AS_WRITEBACK_INDETERMINATE flag set, writeback
operations may take an indeterminate time to complete.  For example,
writing data back to disk in FUSE filesystems depends on the userspace
server successfully completing writeback.

In this commit, wait_sb_inodes() skips waiting on writeback if the inode's
mapping has AS_WRITEBACK_INDETERMINATE set, else sync(2) may take an
indeterminate amount of time to complete.

If the caller wishes to ensure the data for a mapping with the
AS_WRITEBACK_INDETERMINATE flag set has actually been written back to
disk, they should use fsync(2)/fdatasync(2) instead.

Link: https://lkml.kernel.org/r/20241122232359.429647-4-joannelkoong@gmail.com
Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com>
Acked-by: Miklos Szeredi <mszeredi@redhat.com>
Cc: Bernd Schubert <bernd.schubert@fastmail.fm>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Joanne Koong 2024-11-22 15:23:57 -08:00 committed by Andrew Morton
parent 26942ed372
commit 0da1c1a78d
1 changed files with 3 additions and 0 deletions
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3
fs/fs-writeback.c
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@ -2681,6 +2681,9 @@ static void wait_sb_inodes(struct super_block *sb)
if (!mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK))
continue;
if (mapping_writeback_indeterminate(mapping))
continue;
spin_unlock_irq(&sb->s_inode_wblist_lock);
spin_lock(&inode->i_lock);