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authorRyusuke Konishi <konishi.ryusuke@gmail.com>2024-06-10 19:00:28 +0300
committerAndrew Morton <akpm@linux-foundation.org>2024-06-25 08:25:09 +0300
commit25fa5f9923383784bbf2423ccc84f75615e4b12d (patch)
tree98cadfcc6c86bbcf161078c975f23f296683d754 /fs
parentcda1c8e0c33d3e06ef8e912ab1b16f00e4d5d088 (diff)
downloadlinux-25fa5f9923383784bbf2423ccc84f75615e4b12d.tar.xz
nilfs2: prepare backing device folios for writing after adding checksums
Patch series "nilfs2: eliminate the call to inode_attach_wb()". This series eliminates the inode_attach_wb() call from nilfs2, which was introduced as a workaround for a kernel bug but is suspected of layer violation (in fact, it is undesirable since it exposes a reference to the backing device). Removal of the inode_attach_wb() call is done by simply using mark_buffer_dirty() on the backing device's buffers. To use it safely, this series will prepare it in patch 1/2, and perform the replacement itself in patch 2/2. This patch (of 2): In preparation for inode_attach_wb(), which is currently called when attaching the log writer, to be done via mark_buffer_dirty(), change the order of preparation for log writing. Specifically, the function call that adds checksums to segment summary and super root blocks, which correspond to the log header and trailer, is made before starting writeback of folios containing those blocks. The current steps are as follows: 1. Put the folios of segment summary blocks in writeback state. 2. Put the folios of data blocks, metadata file blocks, and btree node blocks (collectively called payload blocks) into writeback state. 3. Put the super root block folio in writeback state. 4. Add checksums. Change these as follows: 1. Put the folios of payload blocks in writeback state. 2. Add checksums. 3. Put the folios of segment summary blocks in writeback state. 4. Put the super root block folio in writeback state. In this order, the contents of segment summaries and super root block that directly use buffer/folio of the backing device can be determined including the addition of checksums, before preparing to write. Step (1), which puts the payload block folios in writeback state, is performed first because if there are memory-mapped data blocks, a valid checksum can only be calculated after step (1). Link: https://lkml.kernel.org/r/20240610160029.7673-2-konishi.ryusuke@gmail.com Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/nilfs2/segment.c85
1 files changed, 52 insertions, 33 deletions
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 6ea81f1d5094..a92609816bc9 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -1639,41 +1639,30 @@ static void nilfs_begin_folio_io(struct folio *folio)
folio_unlock(folio);
}
-static void nilfs_segctor_prepare_write(struct nilfs_sc_info *sci)
+/**
+ * nilfs_prepare_write_logs - prepare to write logs
+ * @logs: logs to prepare for writing
+ * @seed: checksum seed value
+ *
+ * nilfs_prepare_write_logs() adds checksums and prepares the block
+ * buffers/folios for writing logs. In order to stabilize folios of
+ * memory-mapped file blocks by putting them in writeback state before
+ * calculating the checksums, first prepare to write payload blocks other
+ * than segment summary and super root blocks in which the checksums will
+ * be embedded.
+ */
+static void nilfs_prepare_write_logs(struct list_head *logs, u32 seed)
{
struct nilfs_segment_buffer *segbuf;
struct folio *bd_folio = NULL, *fs_folio = NULL;
+ struct buffer_head *bh;
- list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
- struct buffer_head *bh;
-
- list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
- b_assoc_buffers) {
- if (bh->b_folio != bd_folio) {
- if (bd_folio) {
- folio_lock(bd_folio);
- folio_wait_writeback(bd_folio);
- folio_clear_dirty_for_io(bd_folio);
- folio_start_writeback(bd_folio);
- folio_unlock(bd_folio);
- }
- bd_folio = bh->b_folio;
- }
- }
-
+ /* Prepare to write payload blocks */
+ list_for_each_entry(segbuf, logs, sb_list) {
list_for_each_entry(bh, &segbuf->sb_payload_buffers,
b_assoc_buffers) {
- if (bh == segbuf->sb_super_root) {
- if (bh->b_folio != bd_folio) {
- folio_lock(bd_folio);
- folio_wait_writeback(bd_folio);
- folio_clear_dirty_for_io(bd_folio);
- folio_start_writeback(bd_folio);
- folio_unlock(bd_folio);
- bd_folio = bh->b_folio;
- }
+ if (bh == segbuf->sb_super_root)
break;
- }
set_buffer_async_write(bh);
if (bh->b_folio != fs_folio) {
nilfs_begin_folio_io(fs_folio);
@@ -1681,6 +1670,40 @@ static void nilfs_segctor_prepare_write(struct nilfs_sc_info *sci)
}
}
}
+ nilfs_begin_folio_io(fs_folio);
+
+ nilfs_add_checksums_on_logs(logs, seed);
+
+ /* Prepare to write segment summary blocks */
+ list_for_each_entry(segbuf, logs, sb_list) {
+ list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
+ b_assoc_buffers) {
+ if (bh->b_folio == bd_folio)
+ continue;
+ if (bd_folio) {
+ folio_lock(bd_folio);
+ folio_wait_writeback(bd_folio);
+ folio_clear_dirty_for_io(bd_folio);
+ folio_start_writeback(bd_folio);
+ folio_unlock(bd_folio);
+ }
+ bd_folio = bh->b_folio;
+ }
+ }
+
+ /* Prepare to write super root block */
+ bh = NILFS_LAST_SEGBUF(logs)->sb_super_root;
+ if (bh) {
+ if (bh->b_folio != bd_folio) {
+ folio_lock(bd_folio);
+ folio_wait_writeback(bd_folio);
+ folio_clear_dirty_for_io(bd_folio);
+ folio_start_writeback(bd_folio);
+ folio_unlock(bd_folio);
+ bd_folio = bh->b_folio;
+ }
+ }
+
if (bd_folio) {
folio_lock(bd_folio);
folio_wait_writeback(bd_folio);
@@ -1688,7 +1711,6 @@ static void nilfs_segctor_prepare_write(struct nilfs_sc_info *sci)
folio_start_writeback(bd_folio);
folio_unlock(bd_folio);
}
- nilfs_begin_folio_io(fs_folio);
}
static int nilfs_segctor_write(struct nilfs_sc_info *sci,
@@ -2070,10 +2092,7 @@ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
nilfs_segctor_update_segusage(sci, nilfs->ns_sufile);
/* Write partial segments */
- nilfs_segctor_prepare_write(sci);
-
- nilfs_add_checksums_on_logs(&sci->sc_segbufs,
- nilfs->ns_crc_seed);
+ nilfs_prepare_write_logs(&sci->sc_segbufs, nilfs->ns_crc_seed);
err = nilfs_segctor_write(sci, nilfs);
if (unlikely(err))