diff options
| author | Trond Myklebust <trond.myklebust@hammerspace.com> | 2020-12-01 01:03:19 +0300 |
|---|---|---|
| committer | Chuck Lever <chuck.lever@oracle.com> | 2020-12-09 17:39:38 +0300 |
| commit | 01cbf3853959feec40ec9b9a399e12a021cd4d81 (patch) | |
| tree | 08d0a82ebf7f276dccc2c3d45792effffbd1b14f | |
| parent | 2e19d10c1438241de32467637a2a411971547991 (diff) | |
| download | linux-01cbf3853959feec40ec9b9a399e12a021cd4d81.tar.xz | |
nfsd: Set PF_LOCAL_THROTTLE on local filesystems only
Don't set PF_LOCAL_THROTTLE on remote filesystems like NFS, since they
aren't expected to ever be subject to double buffering.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
| -rw-r--r-- | fs/nfs/export.c | 3 | ||||
| -rw-r--r-- | fs/nfsd/vfs.c | 13 | ||||
| -rw-r--r-- | include/linux/exportfs.h | 1 |
3 files changed, 14 insertions, 3 deletions
diff --git a/fs/nfs/export.c b/fs/nfs/export.c index 5428713af5fe..48b879cfe6e3 100644 --- a/fs/nfs/export.c +++ b/fs/nfs/export.c @@ -171,5 +171,6 @@ const struct export_operations nfs_export_ops = { .encode_fh = nfs_encode_fh, .fh_to_dentry = nfs_fh_to_dentry, .get_parent = nfs_get_parent, - .flags = EXPORT_OP_NOWCC|EXPORT_OP_NOSUBTREECHK|EXPORT_OP_CLOSE_BEFORE_UNLINK, + .flags = EXPORT_OP_NOWCC|EXPORT_OP_NOSUBTREECHK| + EXPORT_OP_CLOSE_BEFORE_UNLINK|EXPORT_OP_REMOTE_FS, }; diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 79cba942087e..04937e51de56 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -978,18 +978,25 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfsd_file *nf, __be32 *verf) { struct file *file = nf->nf_file; + struct super_block *sb = file_inode(file)->i_sb; struct svc_export *exp; struct iov_iter iter; __be32 nfserr; int host_err; int use_wgather; loff_t pos = offset; + unsigned long exp_op_flags = 0; unsigned int pflags = current->flags; rwf_t flags = 0; + bool restore_flags = false; trace_nfsd_write_opened(rqstp, fhp, offset, *cnt); - if (test_bit(RQ_LOCAL, &rqstp->rq_flags)) + if (sb->s_export_op) + exp_op_flags = sb->s_export_op->flags; + + if (test_bit(RQ_LOCAL, &rqstp->rq_flags) && + !(exp_op_flags & EXPORT_OP_REMOTE_FS)) { /* * We want throttling in balance_dirty_pages() * and shrink_inactive_list() to only consider @@ -998,6 +1005,8 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfsd_file *nf, * the client's dirty pages or its congested queue. */ current->flags |= PF_LOCAL_THROTTLE; + restore_flags = true; + } exp = fhp->fh_export; use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); @@ -1049,7 +1058,7 @@ out_nfserr: trace_nfsd_write_err(rqstp, fhp, offset, host_err); nfserr = nfserrno(host_err); } - if (test_bit(RQ_LOCAL, &rqstp->rq_flags)) + if (restore_flags) current_restore_flags(pflags, PF_LOCAL_THROTTLE); return nfserr; } diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h index 846df3c96730..d93e8a6737bb 100644 --- a/include/linux/exportfs.h +++ b/include/linux/exportfs.h @@ -216,6 +216,7 @@ struct export_operations { #define EXPORT_OP_NOWCC (0x1) /* don't collect v3 wcc data */ #define EXPORT_OP_NOSUBTREECHK (0x2) /* no subtree checking */ #define EXPORT_OP_CLOSE_BEFORE_UNLINK (0x4) /* close files before unlink */ +#define EXPORT_OP_REMOTE_FS (0x8) /* Filesystem is remote */ unsigned long flags; }; |