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mm,btrfs: add a filemap_flush_nr helper

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Abstract out the btrfs-specific behavior of kicking off I/O on a number
of pages on an address_space into a well-defined helper.

Note: there is no kerneldoc comment for the new function because it is
not part of the public API.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20251024080431.324236-7-hch@lst.de
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christoph Hellwig
2025-10-24 10:04:17 +02:00
committed by Christian Brauner
parent c9501112e3
commit 7fabcb7fba
3 changed files with 25 additions and 11 deletions
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13
fs/btrfs/inode.c
View File

@@ -8752,19 +8752,10 @@ static int start_delalloc_inodes(struct btrfs_root *root, long *nr_to_write,
btrfs_queue_work(root->fs_info->flush_workers,
&work->work);
} else {
struct writeback_control wbc = {
.nr_to_write = *nr_to_write,
.sync_mode = WB_SYNC_NONE,
.range_start = 0,
.range_end = LLONG_MAX,
};
ret = filemap_fdatawrite_wbc(tmp_inode->i_mapping,
&wbc);
ret = filemap_flush_nr(tmp_inode->i_mapping,
nr_to_write);
btrfs_add_delayed_iput(inode);
if (*nr_to_write != LONG_MAX)
*nr_to_write = wbc.nr_to_write;
if (ret || *nr_to_write <= 0)
goto out;
}

1
include/linux/pagemap.h
View File

@@ -38,6 +38,7 @@ int filemap_invalidate_pages(struct address_space *mapping,
int write_inode_now(struct inode *, int sync);
int filemap_fdatawrite(struct address_space *);
int filemap_flush(struct address_space *);
int filemap_flush_nr(struct address_space *mapping, long *nr_to_write);
int filemap_fdatawait_keep_errors(struct address_space *mapping);
int filemap_fdatawait_range(struct address_space *, loff_t lstart, loff_t lend);
int filemap_fdatawait_range_keep_errors(struct address_space *mapping,

22
mm/filemap.c
View File

@@ -474,6 +474,28 @@ int filemap_flush(struct address_space *mapping)
}
EXPORT_SYMBOL(filemap_flush);
/*
* Start writeback on @nr_to_write pages from @mapping. No one but the existing
* btrfs caller should be using this. Talk to linux-mm if you think adding a
* new caller is a good idea.
*/
int filemap_flush_nr(struct address_space *mapping, long *nr_to_write)
{
struct writeback_control wbc = {
.nr_to_write = *nr_to_write,
.sync_mode = WB_SYNC_NONE,
.range_start = 0,
.range_end = LLONG_MAX,
};
int ret;
ret = filemap_fdatawrite_wbc(mapping, &wbc);
if (!ret)
*nr_to_write = wbc.nr_to_write;
return ret;
}
EXPORT_SYMBOL_FOR_MODULES(filemap_flush_nr, "btrfs");
/**
* filemap_range_has_page - check if a page exists in range.
* @mapping: address space within which to check