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[v2,3/8] btrfs: zoned: only allow one process to add pages to a relocation inode

Message ID 15fdddfffd14f3338f621ebd3210993ae7a55081.1631117101.git.johannes.thumshirn@wdc.com (mailing list archive)
State New, archived
Headers show
Series btrfs: zoned: unify relocation on a zoned and regular FS | expand

Commit Message

Johannes Thumshirn Sept. 8, 2021, 4:19 p.m. UTC 
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>
---
 fs/btrfs/extent_io.c | 7 +++++++
 1 file changed, 7 insertions(+)
diff mbox series

Patch

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 8959ac580f46..96ade32cad9b 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -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 +5142,11 @@  int extent_writepages(struct address_space *mapping,
 		.sync_io = wbc->sync_mode == WB_SYNC_ALL,
 	};
 
+	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);