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| author | Trond Myklebust <trond.myklebust@primarydata.com> | 2016-11-21 18:56:38 +0300 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2016-12-20 01:29:55 +0300 |
| commit | e71708d4df1d4b81427badb9ac4bc4a813338b17 (patch) | |
| tree | 2562e1b009f4903ab37d836d85d303a498f2d722 /fs/nfs/pnfs.c | |
| parent | b6808145ad2aa625b962fc55f30484091d5e8fe7 (diff) | |
| download | linux-e71708d4df1d4b81427badb9ac4bc4a813338b17.tar.xz | |
pNFS: Return RW layouts on OPEN_DOWNGRADE
If the client holds no more writeable open state, and does not hold a
write delegation, then send a layoutreturn as part of the OPEN_DOWNGRADE.
We do this only for writes, since some layout drivers may require you to
also hold a read layout if you are doing a R/W workload.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/pnfs.c')
| -rw-r--r-- | fs/nfs/pnfs.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index 896df7bdf85f..59554f3adf29 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -1251,6 +1251,7 @@ bool pnfs_roc(struct inode *ino, nfs4_stateid stateid; enum pnfs_iomode iomode = 0; bool layoutreturn = false, roc = false; + bool skip_read = false; if (!nfs_have_layout(ino)) return false; @@ -1270,18 +1271,27 @@ retry: } /* no roc if we hold a delegation */ - if (nfs4_check_delegation(ino, FMODE_READ)) - goto out_noroc; + if (nfs4_check_delegation(ino, FMODE_READ)) { + if (nfs4_check_delegation(ino, FMODE_WRITE)) + goto out_noroc; + skip_read = true; + } list_for_each_entry(ctx, &nfsi->open_files, list) { state = ctx->state; + if (state == NULL) + continue; /* Don't return layout if there is open file state */ - if (state != NULL && state->state != 0) + if (state->state & FMODE_WRITE) goto out_noroc; + if (state->state & FMODE_READ) + skip_read = true; } list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) { + if (skip_read && lseg->pls_range.iomode == IOMODE_READ) + continue; /* If we are sending layoutreturn, invalidate all valid lsegs */ if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags)) continue; |