diff options
Diffstat (limited to 'fs/nfs/pnfs.h')
| -rw-r--r-- | fs/nfs/pnfs.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h index 5107d14db48..585023fabb5 100644 --- a/fs/nfs/pnfs.h +++ b/fs/nfs/pnfs.h @@ -45,6 +45,11 @@ struct pnfs_layout_segment { struct pnfs_layout_hdr *pls_layout; }; +enum pnfs_try_status { + PNFS_ATTEMPTED = 0, + PNFS_NOT_ATTEMPTED = 1, +}; + #ifdef CONFIG_NFS_V4_1 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4" @@ -70,6 +75,12 @@ struct pnfs_layoutdriver_type { /* test for nfs page cache coalescing */ int (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *); + + /* + * Return PNFS_ATTEMPTED to indicate the layout code has attempted + * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS + */ + enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data); }; struct pnfs_layout_hdr { @@ -157,6 +168,8 @@ pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx, enum pnfs_iomode access_type); void set_pnfs_layoutdriver(struct nfs_server *, u32 id); void unset_pnfs_layoutdriver(struct nfs_server *); +enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *, + const struct rpc_call_ops *); void pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *); int pnfs_layout_process(struct nfs4_layoutget *lgp); void pnfs_free_lseg_list(struct list_head *tmp_list); @@ -227,6 +240,13 @@ pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx, return NULL; } +static inline enum pnfs_try_status +pnfs_try_to_read_data(struct nfs_read_data *data, + const struct rpc_call_ops *call_ops) +{ + return PNFS_NOT_ATTEMPTED; +} + static inline bool pnfs_roc(struct inode *ino) { |