From: Fred Isaman <iisaman@xxxxxxxxxxxxxx>
Signed-off-by: Fred Isaman <iisaman@xxxxxxxxxxxxxx>
[pnfsblock: fix bug getting pnfs_layout_type in translate_devid().]
Signed-off-by: Tao Guo <guotao@xxxxxxxxxxxx>
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
Signed-off-by: Zhang Jingwang <Jingwang.Zhang@xxxxxxx>
---
fs/nfs/blocklayout/blocklayout.c | 39 +++++++++++++++++++++++++++++-----
fs/nfs/blocklayout/blocklayout.h | 6 +++++
fs/nfs/blocklayout/blocklayoutdev.c | 8 +++++++
3 files changed, 47 insertions(+), 6 deletions(-)
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 4ca0838..992fd31 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -110,16 +110,43 @@ static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode,
return &bl->bl_layout;
}
-static void
-bl_free_lseg(struct pnfs_layout_segment *lseg)
+static void bl_free_lseg(struct pnfs_layout_segment *lseg)
{
+ dprintk("%s enter\n", __func__);
+ kfree(lseg);
}
-static struct pnfs_layout_segment *
-bl_alloc_lseg(struct pnfs_layout_hdr *lo,
- struct nfs4_layoutget_res *lgr, gfp_t gfp_flags)
+/* Because the generic infrastructure does not correctly merge layouts,
+ * we pretty much ignore lseg, and store all data layout wide, so we
+ * can correctly merge. Eventually we should push some correct merge
+ * behavior up to the generic code, as the current behavior tends to
+ * cause lots of unnecessary overlapping LAYOUTGET requests.
+ */
+static struct pnfs_layout_segment *bl_alloc_lseg(struct pnfs_layout_hdr *lo,
+ struct nfs4_layoutget_res *lgr,
+ gfp_t gfp_flags)
{
- return NULL;
+ struct pnfs_layout_segment *lseg;
+ int status;
+
+ dprintk("%s enter\n", __func__);
+ lseg = kzalloc(sizeof(*lseg) + 0, gfp_flags);
+ if (!lseg)
+ return NULL;
+ status = nfs4_blk_process_layoutget(lo, lgr, gfp_flags);
+ if (status) {
+ /* We don't want to call the full-blown bl_free_lseg,
+ * since on error extents were not touched.
+ */
+ /* STUB - we really want to distinguish between 2 error
+ * conditions here. This lseg failed, but lo data structures
+ * are OK, or we hosed the lo data structures. The calling
+ * code probably needs to distinguish this too.
+ */
+ kfree(lseg);
+ return ERR_PTR(status);
+ }
+ return lseg;
}
static void
diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h
index 839b81d..5c1ccc1 100644
--- a/fs/nfs/blocklayout/blocklayout.h
+++ b/fs/nfs/blocklayout/blocklayout.h
@@ -93,6 +93,12 @@ static inline struct pnfs_block_layout *BLK_LO2EXT(struct pnfs_layout_hdr *lo)
return container_of(lo, struct pnfs_block_layout, bl_layout);
}
+static inline struct pnfs_block_layout *
+BLK_LSEG2EXT(struct pnfs_layout_segment *lseg)
+{
+ return BLK_LO2EXT(lseg->pls_layout);
+}
+
/* blocklayoutdev.c */
struct block_device *nfs4_blkdev_get(dev_t dev);
int nfs4_blkdev_put(struct block_device *bdev);
diff --git a/fs/nfs/blocklayout/blocklayoutdev.c b/fs/nfs/blocklayout/blocklayoutdev.c
index 9a65a66..0fedf50 100644
--- a/fs/nfs/blocklayout/blocklayoutdev.c
+++ b/fs/nfs/blocklayout/blocklayoutdev.c
@@ -149,3 +149,11 @@ out_err:
kfree(msg);
return NULL;
}
+
+int
+nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo,
+ struct nfs4_layoutget_res *lgr, gfp_t gfp_flags)
+{
+ /* STUB */
+ return -EIO;
+}
--
1.7.4.1
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