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nfsd: Ensure exclusion between CLONE and WRITE errors 

Ensure that we can distinguish between synchronous CLONE and
WRITE errors, and that we can assign them correctly.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2020-01-06 13:40:33 -05:00 committed by J. Bruce Fields
parent b66ae6dd0c
commit 1b28d756b2
1 changed files with 18 additions and 7 deletions
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25
fs/nfsd/vfs.c
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@ -536,22 +536,33 @@ __be32 nfsd4_clone_file_range(struct nfsd_file *nf_src, u64 src_pos,
struct file *src = nf_src->nf_file;
struct file *dst = nf_dst->nf_file;
loff_t cloned;
__be32 ret = 0;
down_write(&nf_dst->nf_rwsem);
cloned = vfs_clone_file_range(src, src_pos, dst, dst_pos, count, 0);
if (cloned < 0)
return nfserrno(cloned);
if (count && cloned != count)
return nfserrno(-EINVAL);
if (cloned < 0) {
ret = nfserrno(cloned);
goto out_err;
}
if (count && cloned != count) {
ret = nfserrno(-EINVAL);
goto out_err;
}
if (sync) {
loff_t dst_end = count ? dst_pos + count - 1 : LLONG_MAX;
int status = vfs_fsync_range(dst, dst_pos, dst_end, 0);
if (!status)
status = commit_inode_metadata(file_inode(src));
if (status < 0)
return nfserrno(status);
if (status < 0) {
nfsd_reset_boot_verifier(net_generic(nf_dst->nf_net,
nfsd_net_id));
ret = nfserrno(status);
}
}
return 0;
out_err:
up_write(&nf_dst->nf_rwsem);
return ret;
}
ssize_t nfsd_copy_file_range(struct file *src, u64 src_pos, struct file *dst,