From: Benny Halevy Subject: [PATCH v2 07/35] pnfsd: define pnfs_export_operations Date: Mon, 7 Dec 2009 11:31:17 +0200 Message-ID: <1260178277-14887-1-git-send-email-bhalevy@panasas.com> References: <4B1CCA52.8020900@panasas.com> Cc: linux-nfs@vger.kernel.org, pnfs@linux-nfs.org, linux-fsdevel@vger.kernel.org, Benny Halevy , Fred Isaman To: " J. Bruce Fields" Return-path: In-Reply-To: <4B1CCA52.8020900@panasas.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: struct pnfs_export_operations defines the VFS level API for pNFS, not including callbacks. A pnfs-exportable filesystem sets a pointer to its pnfs export vector in its struct super_block.s_pnfs_op. The file system provides the per-superblock layout_type method that determines if it supports pnfs for the filesystem identified by the superblock, and if so, with which layout type (only one per-sb is supported). Device ops: get_device_iter is used to fill-in the device list for GETDEVICELIST and get_device_info is used to encode the device info for GETDEVICEINFO. Layout ops: layout_get, layout_commit, and layout_return implement the file system- and layout type- specific parts of their respective protocol operations: LAYOUTGET, LAYOUTCOMMIT, and LAYOUTRETURN. Note: define pnfs export operations in a stub form in this patch. Actual operations are defined along with their usage. Note: the following methods are mandatory to be implemented: layout_type, get_device_info, and layout_get. [pnfsd: provide default no-op operations] Signed-off-by: Benny Halevy [pnfsd: compile fixes for pnfsd branch] Signed-off-by: Fred Isaman [gfs2: set pnfs_dlm_export_ops only for CONFIG_PNFSD] [pnfsd: handle s_pnfs_op==NULL] Signed-off-by: Benny Halevy --- fs/nfsd/export.c | 1 + include/linux/fs.h | 2 ++ include/linux/nfsd/nfsd4_pnfs.h | 14 ++++++++++++++ 3 files changed, 17 insertions(+), 0 deletions(-) diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c index cd377a7..f82ed90 100644 --- a/fs/nfsd/export.c +++ b/fs/nfsd/export.c @@ -18,6 +18,7 @@ #include #include +#include #include #include diff --git a/include/linux/fs.h b/include/linux/fs.h index 2620a8c..9a9beb8 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -382,6 +382,7 @@ struct inodes_stat_t { #include struct export_operations; +struct pnfs_export_operations; struct hd_geometry; struct iovec; struct nameidata; @@ -1325,6 +1326,7 @@ struct super_block { const struct dquot_operations *dq_op; const struct quotactl_ops *s_qcop; const struct export_operations *s_export_op; + const struct pnfs_export_operations *s_pnfs_op; unsigned long s_flags; unsigned long s_magic; struct dentry *s_root; diff --git a/include/linux/nfsd/nfsd4_pnfs.h b/include/linux/nfsd/nfsd4_pnfs.h index 9e7d95e..ff6613e 100644 --- a/include/linux/nfsd/nfsd4_pnfs.h +++ b/include/linux/nfsd/nfsd4_pnfs.h @@ -34,4 +34,18 @@ #ifndef _LINUX_NFSD_NFSD4_PNFS_H #define _LINUX_NFSD_NFSD4_PNFS_H +/* + * pNFS export operations vector. + * + * The filesystem must implement the following methods: + * layout_type + * get_device_info + * layout_get + * + * All other methods are optional and can be set to NULL if not implemented. + */ +struct pnfs_export_operations { + /* stub */ +}; + #endif /* _LINUX_NFSD_NFSD4_PNFS_H */ -- 1.6.5.1