Change from v1:
Instead of moving the i_lock protected region around, store last written
byte for block layouts on struct pnfs_block_layout and use that when
encoding LAYOUTCOMMIT.
8<------------------------------------------------------------------------
Block/SCSI layout write completion may add committable extents to the
extent tree before updating the layout's last-written byte under the inode
lock. If a sync happens before this value is updated, then
prepare_layoutcommit may find and encode these extents which would produce
a LAYOUTCOMMIT request whose encoded extents are larger than the request's
loca_length.
Fix this by using a last-written byte value that is updated atomically with
the extent tree.
Signed-off-by: Benjamin Coddington <bcodding@xxxxxxxxxx>
---
fs/nfs/blocklayout/blocklayout.c | 2 +-
fs/nfs/blocklayout/blocklayout.h | 3 ++-
fs/nfs/blocklayout/extent_tree.c | 8 +++++---
3 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 17a42e4eb872..25cdd559831c 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -344,7 +344,7 @@ static void bl_write_cleanup(struct work_struct *work)
PAGE_SIZE - 1) & (loff_t)PAGE_MASK;
ext_tree_mark_written(bl, start >> SECTOR_SHIFT,
- (end - start) >> SECTOR_SHIFT);
+ (end - start) >> SECTOR_SHIFT, end);
}
pnfs_ld_write_done(hdr);
diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h
index 18e6fd0b9506..efc007f00742 100644
--- a/fs/nfs/blocklayout/blocklayout.h
+++ b/fs/nfs/blocklayout/blocklayout.h
@@ -141,6 +141,7 @@ struct pnfs_block_layout {
struct rb_root bl_ext_ro;
spinlock_t bl_ext_lock; /* Protects list manipulation */
bool bl_scsi_layout;
+ u64 bl_lwb;
};
static inline struct pnfs_block_layout *
@@ -182,7 +183,7 @@ int ext_tree_insert(struct pnfs_block_layout *bl,
int ext_tree_remove(struct pnfs_block_layout *bl, bool rw, sector_t start,
sector_t end);
int ext_tree_mark_written(struct pnfs_block_layout *bl, sector_t start,
- sector_t len);
+ sector_t len, u64 lwb);
bool ext_tree_lookup(struct pnfs_block_layout *bl, sector_t isect,
struct pnfs_block_extent *ret, bool rw);
int ext_tree_prepare_commit(struct nfs4_layoutcommit_args *arg);
diff --git a/fs/nfs/blocklayout/extent_tree.c b/fs/nfs/blocklayout/extent_tree.c
index 992bcb19c11e..8d08dfe1e057 100644
--- a/fs/nfs/blocklayout/extent_tree.c
+++ b/fs/nfs/blocklayout/extent_tree.c
@@ -402,7 +402,7 @@ ext_tree_split(struct rb_root *root, struct pnfs_block_extent *be,
int
ext_tree_mark_written(struct pnfs_block_layout *bl, sector_t start,
- sector_t len)
+ sector_t len, u64 lwb)
{
struct rb_root *root = &bl->bl_ext_rw;
sector_t end = start + len;
@@ -471,6 +471,7 @@ ext_tree_mark_written(struct pnfs_block_layout *bl, sector_t start,
}
}
out:
+ bl->bl_lwb = lwb;
spin_unlock(&bl->bl_ext_lock);
__ext_put_deviceids(&tmp);
@@ -518,7 +519,7 @@ static __be32 *encode_scsi_range(struct pnfs_block_extent *be, __be32 *p)
}
static int ext_tree_encode_commit(struct pnfs_block_layout *bl, __be32 *p,
- size_t buffer_size, size_t *count)
+ size_t buffer_size, size_t *count, __u64 *lastbyte)
{
struct pnfs_block_extent *be;
int ret = 0;
@@ -541,6 +542,7 @@ static int ext_tree_encode_commit(struct pnfs_block_layout *bl, __be32 *p,
else
p = encode_block_extent(be, p);
be->be_tag = EXTENT_COMMITTING;
+ *lastbyte = bl->bl_lwb - 1;
}
spin_unlock(&bl->bl_ext_lock);
@@ -564,7 +566,7 @@ ext_tree_prepare_commit(struct nfs4_layoutcommit_args *arg)
arg->layoutupdate_pages = &arg->layoutupdate_page;
retry:
- ret = ext_tree_encode_commit(bl, start_p + 1, buffer_size, &count);
+ ret = ext_tree_encode_commit(bl, start_p + 1, buffer_size, &count, &arg->lastbytewritten);
if (unlikely(ret)) {
ext_tree_free_commitdata(arg, buffer_size);
--
2.5.5
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