diff options
Diffstat (limited to 'fs/exportfs/expfs.c')
| -rw-r--r-- | fs/exportfs/expfs.c | 41 |
1 files changed, 25 insertions, 16 deletions
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c index 35246531239..109ab5e44ec 100644 --- a/fs/exportfs/expfs.c +++ b/fs/exportfs/expfs.c @@ -1,4 +1,13 @@ - +/* + * Copyright (C) Neil Brown 2002 + * Copyright (C) Christoph Hellwig 2007 + * + * This file contains the code mapping from inodes to NFS file handles, + * and for mapping back from file handles to dentries. + * + * For details on why we do all the strange and hairy things in here + * take a look at Documentation/filesystems/Exporting. + */ #include <linux/exportfs.h> #include <linux/fs.h> #include <linux/file.h> @@ -9,19 +18,19 @@ #define dprintk(fmt, args...) do{}while(0) -static int get_name(struct dentry *dentry, char *name, +static int get_name(struct vfsmount *mnt, struct dentry *dentry, char *name, struct dentry *child); -static int exportfs_get_name(struct dentry *dir, char *name, - struct dentry *child) +static int exportfs_get_name(struct vfsmount *mnt, struct dentry *dir, + char *name, struct dentry *child) { const struct export_operations *nop = dir->d_sb->s_export_op; if (nop->get_name) return nop->get_name(dir, name, child); else - return get_name(dir, name, child); + return get_name(mnt, dir, name, child); } /* @@ -85,7 +94,7 @@ find_disconnected_root(struct dentry *dentry) * It may already be, as the flag isn't always updated when connection happens. */ static int -reconnect_path(struct super_block *sb, struct dentry *target_dir) +reconnect_path(struct vfsmount *mnt, struct dentry *target_dir) { char nbuf[NAME_MAX+1]; int noprogress = 0; @@ -108,7 +117,7 @@ reconnect_path(struct super_block *sb, struct dentry *target_dir) pd->d_flags &= ~DCACHE_DISCONNECTED; spin_unlock(&pd->d_lock); noprogress = 0; - } else if (pd == sb->s_root) { + } else if (pd == mnt->mnt_sb->s_root) { printk(KERN_ERR "export: Eeek filesystem root is not connected, impossible\n"); spin_lock(&pd->d_lock); pd->d_flags &= ~DCACHE_DISCONNECTED; @@ -134,8 +143,8 @@ reconnect_path(struct super_block *sb, struct dentry *target_dir) struct dentry *npd; mutex_lock(&pd->d_inode->i_mutex); - if (sb->s_export_op->get_parent) - ppd = sb->s_export_op->get_parent(pd); + if (mnt->mnt_sb->s_export_op->get_parent) + ppd = mnt->mnt_sb->s_export_op->get_parent(pd); mutex_unlock(&pd->d_inode->i_mutex); if (IS_ERR(ppd)) { @@ -148,7 +157,7 @@ reconnect_path(struct super_block *sb, struct dentry *target_dir) dprintk("%s: find name of %lu in %lu\n", __FUNCTION__, pd->d_inode->i_ino, ppd->d_inode->i_ino); - err = exportfs_get_name(ppd, nbuf, pd); + err = exportfs_get_name(mnt, ppd, nbuf, pd); if (err) { dput(ppd); dput(pd); @@ -238,8 +247,8 @@ static int filldir_one(void * __buf, const char * name, int len, * calls readdir on the parent until it finds an entry with * the same inode number as the child, and returns that. */ -static int get_name(struct dentry *dentry, char *name, - struct dentry *child) +static int get_name(struct vfsmount *mnt, struct dentry *dentry, + char *name, struct dentry *child) { struct inode *dir = dentry->d_inode; int error; @@ -255,7 +264,7 @@ static int get_name(struct dentry *dentry, char *name, /* * Open the directory ... */ - file = dentry_open(dget(dentry), NULL, O_RDONLY); + file = dentry_open(dget(dentry), mntget(mnt), O_RDONLY); error = PTR_ERR(file); if (IS_ERR(file)) goto out; @@ -372,7 +381,7 @@ struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid, * filesystem root. */ if (result->d_flags & DCACHE_DISCONNECTED) { - err = reconnect_path(mnt->mnt_sb, result); + err = reconnect_path(mnt, result); if (err) goto err_result; } @@ -424,7 +433,7 @@ struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid, * connected to the filesystem root. The VFS really doesn't * like disconnected directories.. */ - err = reconnect_path(mnt->mnt_sb, target_dir); + err = reconnect_path(mnt, target_dir); if (err) { dput(target_dir); goto err_result; @@ -435,7 +444,7 @@ struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid, * dentry for the inode we're after, make sure that our * inode is actually connected to the parent. */ - err = exportfs_get_name(target_dir, nbuf, result); + err = exportfs_get_name(mnt, target_dir, nbuf, result); if (!err) { mutex_lock(&target_dir->d_inode->i_mutex); nresult = lookup_one_len(nbuf, target_dir, |