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| author | Trond Myklebust | 2015-08-25 23:38:25 +0200 |
|---|---|---|
| committer | Trond Myklebust | 2015-08-26 01:42:43 +0200 |
| commit | 0762ed2ced40bfe648378ef0e1635cf4d3a6fb76 (patch) | |
| tree | 53329ba229bf0d7bc73c433a664ea551828444c9 /fs/nfs/pnfs.h | |
| parent | NFSv4.1/pnfs: Allow pNFS device drivers to customise layout segment insertion (diff) | |
| download | kernel-qcow2-linux-0762ed2ced40bfe648378ef0e1635cf4d3a6fb76.tar.gz kernel-qcow2-linux-0762ed2ced40bfe648378ef0e1635cf4d3a6fb76.tar.xz kernel-qcow2-linux-0762ed2ced40bfe648378ef0e1635cf4d3a6fb76.zip | |
NFSv4.1/flexfiles: Allow coalescing of new layout segments and existing ones
In order to ensure atomicity of updates, we merge the old layout segments
into the new ones, and then invalidate the old ones.
Also ensure that we order the list of layout segments so that
RO segments are preferred over RW.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/pnfs.h')
| -rw-r--r-- | fs/nfs/pnfs.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h index 869069d8b996..78c9351ff117 100644 --- a/fs/nfs/pnfs.h +++ b/fs/nfs/pnfs.h @@ -539,6 +539,22 @@ pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src, nfss->pnfs_curr_ld->id == src->l_type); } +static inline u64 +pnfs_calc_offset_end(u64 offset, u64 len) +{ + if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset) + return NFS4_MAX_UINT64; + return offset + len - 1; +} + +static inline u64 +pnfs_calc_offset_length(u64 offset, u64 end) +{ + if (end == NFS4_MAX_UINT64 || end <= offset) + return NFS4_MAX_UINT64; + return 1 + end - offset; +} + extern unsigned int layoutstats_timer; #ifdef NFS_DEBUG |