[PATCH v2 3/8] btrfs: zoned: only allow one process to add pages to a relocation inode
From: Johannes Thumshirn <hidden>
Date: 2021-09-08 16:19:48
Subsystem:
btrfs file system, filesystems (vfs and infrastructure), the rest · Maintainers:
Chris Mason, David Sterba, Alexander Viro, Christian Brauner, Linus Torvalds
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 <redacted> --- fs/btrfs/extent_io.c | 7 +++++++ 1 file changed, 7 insertions(+)
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);
--
2.32.0