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btrfs: zoned: only allow one process to add pages to a relocation inode

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Don't allow more than one process to add pages to a relocation inode on
a zoned filesystem, otherwise we cannot guarantee the sequential write
rule once we're filling preallocated extents on a zoned filesystem.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2021-09-09 01:19:27 +09:00 committed by David Sterba
parent c2707a2556
commit 35156d8527
1 changed files with 11 additions and 0 deletions
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11
fs/btrfs/extent_io.c
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@ -5132,6 +5132,9 @@ int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
int extent_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct inode *inode = mapping->host;
const bool data_reloc = btrfs_is_data_reloc_root(BTRFS_I(inode)->root);
const bool zoned = btrfs_is_zoned(BTRFS_I(inode)->root->fs_info);
int ret = 0;
struct extent_page_data epd = {
.bio_ctrl = { 0 },
@ -5139,7 +5142,15 @@ int extent_writepages(struct address_space *mapping,
.sync_io = wbc->sync_mode == WB_SYNC_ALL,
};
/*
* Allow only a single thread to do the reloc work in zoned mode to
* protect the write pointer updates.
*/
if (data_reloc && zoned)
btrfs_inode_lock(inode, 0);
ret = extent_write_cache_pages(mapping, wbc, &epd);
if (data_reloc && zoned)
btrfs_inode_unlock(inode, 0);
ASSERT(ret <= 0);
if (ret < 0) {
end_write_bio(&epd, ret);