Re: [patch 4/8] fs, exportfs: Add export_encode_inode_fh helper
From: Aneesh Kumar K.V <hidden>
Date: 2012-08-20 14:19:23
Also in:
lkml
Cyrill Gorcunov [off-list ref] writes:
To provide fsnotify object inodes being watched without binding to alphabetical path we need to encode them with exportfs help. This patch adds a helper which operates with plain inodes directly.
doesn't name_to_handle_at() work for you ? It also allows to get a file handle using file descriptor.
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Signed-off-by: Cyrill Gorcunov <redacted> Acked-by: Pavel Emelyanov <redacted> CC: Al Viro <viro@ZenIV.linux.org.uk> CC: Alexey Dobriyan <redacted> CC: Andrew Morton <akpm@linux-foundation.org> CC: James Bottomley <redacted> --- fs/exportfs/expfs.c | 19 +++++++++++++++++++ include/linux/exportfs.h | 2 ++ 2 files changed, 21 insertions(+) Index: linux-2.6.git/fs/exportfs/expfs.c ===================================================================--- linux-2.6.git.orig/fs/exportfs/expfs.c +++ linux-2.6.git/fs/exportfs/expfs.c@@ -302,6 +302,25 @@ out: return error; } +int export_encode_inode_fh(struct inode *inode, struct fid *fid, int *max_len) +{ + int len = *max_len; + int type = FILEID_INO32_GEN; + + if (len < 2) { + *max_len = 2; + return 255; + } + + len = 2; + fid->i32.ino = inode->i_ino; + fid->i32.gen = inode->i_generation; + *max_len = len; + + return type; +} +EXPORT_SYMBOL_GPL(export_encode_inode_fh); +
If you are looking at getting file handle, that may not be sufficient. Some file system put more info in file handle (btrfs)
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/** * export_encode_fh - default export_operations->encode_fh function * @inode: the object to encode Index: linux-2.6.git/include/linux/exportfs.h ===================================================================--- linux-2.6.git.orig/include/linux/exportfs.h +++ linux-2.6.git/include/linux/exportfs.h@@ -177,6 +177,8 @@ struct export_operations { int (*commit_metadata)(struct inode *inode); }; +extern int export_encode_inode_fh(struct inode *inode, struct fid *fid, int *max_len); + extern int exportfs_encode_fh(struct dentry *dentry, struct fid *fid, int *max_len, int connectable); extern struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid,
-aneesh