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pNFS: Fix the pnfs block driver's calculation of layoutget size

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[ Upstream commit 8a6291bf3b ]

Instead of relying on the value of the 'bytes_left' field, we should
calculate the layout size based on the offset of the request that is
being written out.

Reported-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Fixes: 954998b60c ("NFS: Fix error handling for O_DIRECT write scheduling")
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Tested-by: Benjamin Coddington <bcodding@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Trond Myklebust 2023-11-17 06:25:13 -05:00 committed by Greg Kroah-Hartman
parent b10370b1ea
commit a058f0c432
4 changed files with 8 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
fs/nfs/blocklayout/blocklayout.c
View File

@ -895,10 +895,9 @@ bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
}
if (pgio->pg_dreq == NULL)
wb_size = pnfs_num_cont_bytes(pgio->pg_inode,
req->wb_index);
wb_size = pnfs_num_cont_bytes(pgio->pg_inode, req->wb_index);
else
wb_size = nfs_dreq_bytes_left(pgio->pg_dreq);
wb_size = nfs_dreq_bytes_left(pgio->pg_dreq, req_offset(req));
pnfs_generic_pg_init_write(pgio, req, wb_size);

5
fs/nfs/direct.c
View File

@ -195,9 +195,10 @@ static void nfs_direct_req_release(struct nfs_direct_req *dreq)
kref_put(&dreq->kref, nfs_direct_req_free);
}
ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq)
ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq, loff_t offset)
{
return dreq->bytes_left;
loff_t start = offset - dreq->io_start;
return dreq->max_count - start;
}
EXPORT_SYMBOL_GPL(nfs_dreq_bytes_left);

2
fs/nfs/internal.h
View File

@ -640,7 +640,7 @@ extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
/* direct.c */
void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
struct nfs_direct_req *dreq);
extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq, loff_t offset);
/* nfs4proc.c */
extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,

3
fs/nfs/pnfs.c
View File

@ -2729,7 +2729,8 @@ pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *r
if (pgio->pg_dreq == NULL)
rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
else
rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
rd_size = nfs_dreq_bytes_left(pgio->pg_dreq,
req_offset(req));
pgio->pg_lseg =
pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),