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NFSv4.1/pnfs: Separate out metadata and data consistency for pNFS

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The LAYOUTCOMMIT operation means different things to different layout types.
For blocks and objects, it is both a data and metadata consistency operation.
For files and flexfiles, it is only a metadata consistency operation.

This patch separates out the 2 cases, allowing the files/flexfiles layout
drivers to optimise away the data consistency calls to layoutcommit.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust
2015-03-25 14:14:42 -04:00
parent 7140171ea9
commit 5bb89b4702
9 changed files with 47 additions and 8 deletions
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18
fs/nfs/pnfs.h
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@@ -155,6 +155,8 @@ struct pnfs_layoutdriver_type {
int how,
struct nfs_commit_info *cinfo);
int (*sync)(struct inode *inode, bool datasync);
/*
* Return PNFS_ATTEMPTED to indicate the layout code has attempted
* I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
@@ -267,6 +269,8 @@ bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task);
void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
int pnfs_generic_sync(struct inode *inode, bool datasync);
int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
int _pnfs_return_layout(struct inode *);
int pnfs_commit_and_return_layout(struct inode *);
void pnfs_ld_write_done(struct nfs_pgio_header *);
@@ -488,6 +492,14 @@ pnfs_ld_read_whole_page(struct inode *inode)
return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
}
static inline int
pnfs_sync_inode(struct inode *inode, bool datasync)
{
if (!pnfs_enabled_sb(NFS_SERVER(inode)))
return 0;
return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
}
static inline bool
pnfs_layoutcommit_outstanding(struct inode *inode)
{
@@ -570,6 +582,12 @@ pnfs_ld_read_whole_page(struct inode *inode)
return false;
}
static inline int
pnfs_sync_inode(struct inode *inode, bool datasync)
{
return 0;
}
static inline bool
pnfs_roc(struct inode *ino)
{