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Message-ID: <20251002203121.182395-3-sergeybashirov@gmail.com>
Date: Thu, 2 Oct 2025 23:31:12 +0300
From: Sergey Bashirov <sergeybashirov@...il.com>
To: Chuck Lever <chuck.lever@...cle.com>,
Christoph Hellwig <hch@...radead.org>,
Dai Ngo <Dai.Ngo@...cle.com>,
Jeff Layton <jlayton@...nel.org>,
NeilBrown <neil@...wn.name>,
Olga Kornievskaia <okorniev@...hat.com>,
Tom Talpey <tom@...pey.com>
Cc: linux-nfs@...r.kernel.org,
linux-kernel@...r.kernel.org,
Sergey Bashirov <sergeybashirov@...il.com>
Subject: [PATCH v2 2/4] NFSD/blocklayout: Extract extent mapping from proc_layoutget
No changes in functionality. Split the proc_layoutget function to
create a helper function that maps single extent to the requested
range. This helper function is then used to implement support for
multiple extents per LAYOUTGET.
Signed-off-by: Sergey Bashirov <sergeybashirov@...il.com>
---
fs/nfsd/blocklayout.c | 115 ++++++++++++++++++++++++------------------
1 file changed, 66 insertions(+), 49 deletions(-)
diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c
index 425648565ab2..35a95501db63 100644
--- a/fs/nfsd/blocklayout.c
+++ b/fs/nfsd/blocklayout.c
@@ -17,68 +17,44 @@
#define NFSDDBG_FACILITY NFSDDBG_PNFS
+/*
+ * Get an extent from the file system that starts at offset or below
+ * and may be shorter than the requested length.
+ */
static __be32
-nfsd4_block_proc_layoutget(struct svc_rqst *rqstp, struct inode *inode,
- const struct svc_fh *fhp, struct nfsd4_layoutget *args)
+nfsd4_block_map_extent(struct inode *inode, const struct svc_fh *fhp,
+ u64 offset, u64 length, u32 iomode, u64 minlength,
+ struct pnfs_block_extent *bex)
{
- struct nfsd4_layout_seg *seg = &args->lg_seg;
struct super_block *sb = inode->i_sb;
- u64 length;
- u32 block_size = i_blocksize(inode);
- struct pnfs_block_extent *bex;
struct iomap iomap;
u32 device_generation = 0;
int error;
- if (locks_in_grace(SVC_NET(rqstp)))
- return nfserr_grace;
-
- if (seg->offset & (block_size - 1)) {
- dprintk("pnfsd: I/O misaligned\n");
- goto out_layoutunavailable;
- }
-
- /*
- * Some clients barf on non-zero block numbers for NONE or INVALID
- * layouts, so make sure to zero the whole structure.
- */
- error = -ENOMEM;
- bex = kzalloc(sizeof(*bex), GFP_KERNEL);
- if (!bex)
- goto out_error;
- args->lg_content = bex;
-
- error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length,
- &iomap, seg->iomode != IOMODE_READ,
- &device_generation);
+ error = sb->s_export_op->map_blocks(inode, offset, length, &iomap,
+ iomode != IOMODE_READ, &device_generation);
if (error) {
if (error == -ENXIO)
- goto out_layoutunavailable;
- goto out_error;
- }
-
- length = iomap.offset + iomap.length - seg->offset;
- if (length < args->lg_minlength) {
- dprintk("pnfsd: extent smaller than minlength\n");
- goto out_layoutunavailable;
+ return nfserr_layoutunavailable;
+ return nfserrno(error);
}
switch (iomap.type) {
case IOMAP_MAPPED:
- if (seg->iomode == IOMODE_READ)
+ if (iomode == IOMODE_READ)
bex->es = PNFS_BLOCK_READ_DATA;
else
bex->es = PNFS_BLOCK_READWRITE_DATA;
bex->soff = iomap.addr;
break;
case IOMAP_UNWRITTEN:
- if (seg->iomode & IOMODE_RW) {
+ if (iomode & IOMODE_RW) {
/*
* Crack monkey special case from section 2.3.1.
*/
- if (args->lg_minlength == 0) {
+ if (minlength == 0) {
dprintk("pnfsd: no soup for you!\n");
- goto out_layoutunavailable;
+ return nfserr_layoutunavailable;
}
bex->es = PNFS_BLOCK_INVALID_DATA;
@@ -87,7 +63,7 @@ nfsd4_block_proc_layoutget(struct svc_rqst *rqstp, struct inode *inode,
}
fallthrough;
case IOMAP_HOLE:
- if (seg->iomode == IOMODE_READ) {
+ if (iomode == IOMODE_READ) {
bex->es = PNFS_BLOCK_NONE_DATA;
break;
}
@@ -95,27 +71,68 @@ nfsd4_block_proc_layoutget(struct svc_rqst *rqstp, struct inode *inode,
case IOMAP_DELALLOC:
default:
WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type);
- goto out_layoutunavailable;
+ return nfserr_layoutunavailable;
}
error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation);
if (error)
- goto out_error;
+ return nfserrno(error);
+
bex->foff = iomap.offset;
bex->len = iomap.length;
+ return nfs_ok;
+}
+
+static __be32
+nfsd4_block_proc_layoutget(struct svc_rqst *rqstp, struct inode *inode,
+ const struct svc_fh *fhp, struct nfsd4_layoutget *args)
+{
+ struct nfsd4_layout_seg *seg = &args->lg_seg;
+ struct pnfs_block_extent *bex;
+ u64 length;
+ u32 block_size = i_blocksize(inode);
+ __be32 nfserr;
+
+ if (locks_in_grace(SVC_NET(rqstp)))
+ return nfserr_grace;
- seg->offset = iomap.offset;
- seg->length = iomap.length;
+ nfserr = nfserr_layoutunavailable;
+ if (seg->offset & (block_size - 1)) {
+ dprintk("pnfsd: I/O misaligned\n");
+ goto out_error;
+ }
+
+ /*
+ * Some clients barf on non-zero block numbers for NONE or INVALID
+ * layouts, so make sure to zero the whole structure.
+ */
+ nfserr = nfserrno(-ENOMEM);
+ bex = kzalloc(sizeof(*bex), GFP_KERNEL);
+ if (!bex)
+ goto out_error;
+ args->lg_content = bex;
+
+ nfserr = nfsd4_block_map_extent(inode, fhp, seg->offset, seg->length,
+ seg->iomode, args->lg_minlength, bex);
+ if (nfserr != nfs_ok)
+ goto out_error;
+
+ nfserr = nfserr_layoutunavailable;
+ length = bex->foff + bex->len - seg->offset;
+ if (length < args->lg_minlength) {
+ dprintk("pnfsd: extent smaller than minlength\n");
+ goto out_error;
+ }
+
+ seg->offset = bex->foff;
+ seg->length = bex->len;
dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es);
- return 0;
+ return nfs_ok;
out_error:
seg->length = 0;
- return nfserrno(error);
-out_layoutunavailable:
- seg->length = 0;
- return nfserr_layoutunavailable;
+ return nfserr;
}
static __be32
--
2.43.0
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