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| author | Trond Myklebust <trond.myklebust@hammerspace.com> | 2021-12-19 04:38:01 +0300 |
|---|---|---|
| committer | Chuck Lever <chuck.lever@oracle.com> | 2022-01-08 22:42:02 +0300 |
| commit | 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb (patch) | |
| tree | 153fdbfe95cc5a1db17151d7e60ec132848e36ef /fs/nfsd/nfs4proc.c | |
| parent | f11ad7aa653130b71e2e89bed207f387718216d5 (diff) | |
| download | linux-555dbf1a9aac6d3150c8b52fa35f768a692f4eeb.tar.xz | |
nfsd: Replace use of rwsem with errseq_t
The nfsd_file nf_rwsem is currently being used to separate file write
and commit instances to ensure that we catch errors and apply them to
the correct write/commit.
We can improve scalability at the expense of a little accuracy (some
extra false positives) by replacing the nf_rwsem with more careful
use of the errseq_t mechanism to track errors across the different
operations.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
[ cel: rebased on zero-verifier fix ]
Diffstat (limited to 'fs/nfsd/nfs4proc.c')
| -rw-r--r-- | fs/nfsd/nfs4proc.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index a6dc5e18c498..56405fc58bfc 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1510,6 +1510,9 @@ static void nfsd4_init_copy_res(struct nfsd4_copy *copy, bool sync) static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy) { + struct file *dst = copy->nf_dst->nf_file; + struct file *src = copy->nf_src->nf_file; + errseq_t since; ssize_t bytes_copied = 0; u64 bytes_total = copy->cp_count; u64 src_pos = copy->cp_src_pos; @@ -1522,9 +1525,8 @@ static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy) do { if (kthread_should_stop()) break; - bytes_copied = nfsd_copy_file_range(copy->nf_src->nf_file, - src_pos, copy->nf_dst->nf_file, dst_pos, - bytes_total); + bytes_copied = nfsd_copy_file_range(src, src_pos, dst, dst_pos, + bytes_total); if (bytes_copied <= 0) break; bytes_total -= bytes_copied; @@ -1534,11 +1536,11 @@ static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy) } while (bytes_total > 0 && !copy->cp_synchronous); /* for a non-zero asynchronous copy do a commit of data */ if (!copy->cp_synchronous && copy->cp_res.wr_bytes_written > 0) { - down_write(©->nf_dst->nf_rwsem); - status = vfs_fsync_range(copy->nf_dst->nf_file, - copy->cp_dst_pos, + since = READ_ONCE(dst->f_wb_err); + status = vfs_fsync_range(dst, copy->cp_dst_pos, copy->cp_res.wr_bytes_written, 0); - up_write(©->nf_dst->nf_rwsem); + if (!status) + status = filemap_check_wb_err(dst->f_mapping, since); if (!status) copy->committed = true; } |