From ee154f01bf0bdb5e85524c518c19964272d33cd9 Mon Sep 17 00:00:00 2001 From: Brian Behlendorf Date: Wed, 26 Jan 2011 12:08:24 -0800 Subject: [PATCH] Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors. --- module/zfs/zpl_inode.c | 331 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 331 insertions(+) create mode 100644 module/zfs/zpl_inode.c diff --git a/module/zfs/zpl_inode.c b/module/zfs/zpl_inode.c new file mode 100644 index 000000000..e866dcd4d --- /dev/null +++ b/module/zfs/zpl_inode.c @@ -0,0 +1,331 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright (c) 2011, Lawrence Livermore National Security, LLC. + */ + + +#include +#include +#include +#include + + +static struct dentry * +zpl_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) +{ + struct inode *ip; + cred_t *cr; + int error; + + cr = (cred_t *)get_current_cred(); + error = -zfs_lookup(dir, dname(dentry), &ip, 0, cr, NULL, NULL); + ASSERT3S(error, <=, 0); + put_cred(cr); + + if (error) { + if (error == -ENOENT) + return d_splice_alias(NULL, dentry); + else + return ERR_PTR(error); + } + + return d_splice_alias(ip, dentry); +} + +static int +zpl_create(struct inode *dir, struct dentry *dentry, int mode, + struct nameidata *nd) +{ + const struct cred *cred; + struct inode *ip; + vattr_t *vap; + int error; + + cred = get_current_cred(); + vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP); + vap->va_mode = mode; + vap->va_mask = ATTR_MODE; + vap->va_uid = current_fsuid(); + vap->va_gid = current_fsgid(); + + error = -zfs_create(dir, (char *)dentry->d_name.name, + vap, 0, mode, &ip, (struct cred *)cred, 0, NULL); + if (error) + goto out; + + d_instantiate(dentry, ip); +out: + kmem_free(vap, sizeof(vattr_t)); + put_cred(cred); + ASSERT3S(error, <=, 0); + + return (error); +} + +static int +zpl_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) +{ + const struct cred *cred; + struct inode *ip; + vattr_t *vap; + int error; + + cred = get_current_cred(); + vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP); + vap->va_mode = mode; + vap->va_mask = ATTR_MODE; + vap->va_rdev = rdev; + vap->va_uid = current_fsuid(); + vap->va_gid = current_fsgid(); + + error = -zfs_create(dir, (char *)dentry->d_name.name, + vap, 0, mode, &ip, (struct cred *)cred, 0, NULL); + if (error) + goto out; + + d_instantiate(dentry, ip); +out: + kmem_free(vap, sizeof(vattr_t)); + put_cred(cred); + ASSERT3S(error, <=, 0); + + return (-error); +} + +static int +zpl_unlink(struct inode *dir, struct dentry *dentry) +{ + cred_t *cr; + int error; + + cr = (cred_t *)get_current_cred(); + error = -zfs_remove(dir, dname(dentry), cr); + put_cred(cr); + ASSERT3S(error, <=, 0); + + return (error); +} + +static int +zpl_mkdir(struct inode *dir, struct dentry *dentry, int mode) +{ + cred_t *cr; + vattr_t *vap; + struct inode *ip; + int error; + + cr = (cred_t *)get_current_cred(); + vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP); + vap->va_mode = S_IFDIR | mode; + vap->va_mask = ATTR_MODE; + vap->va_uid = current_fsuid(); + vap->va_gid = current_fsgid(); + + error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL); + if (error) + goto out; + + d_instantiate(dentry, ip); +out: + kmem_free(vap, sizeof(vattr_t)); + put_cred(cr); + ASSERT3S(error, <=, 0); + + return (error); +} + +static int +zpl_rmdir(struct inode * dir, struct dentry *dentry) +{ + cred_t *cr; + int error; + + cr = (cred_t *)get_current_cred(); + error = -zfs_rmdir(dir, dname(dentry), NULL, cr, 0); + put_cred(cr); + ASSERT3S(error, <=, 0); + + return (error); +} + +static int +zpl_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) +{ + cred_t *cr; + int error; + + cr = (cred_t *)get_current_cred(); + error = -zfs_getattr(dentry->d_inode, stat, 0, cr); + put_cred(cr); + ASSERT3S(error, <=, 0); + + return (error); +} + +static int +zpl_setattr(struct dentry *dentry, struct iattr *attr) +{ + cred_t *cr; + int error; + + error = inode_change_ok(dentry->d_inode, attr); + if (error) + return (error); + + cr = (cred_t *)get_current_cred(); + error = -zfs_setattr(dentry->d_inode, attr, 0, cr); + put_cred(cr); + ASSERT3S(error, <=, 0); + + return (-error); +} + +static int +zpl_rename(struct inode *sdip, struct dentry *sdentry, + struct inode *tdip, struct dentry *tdentry) +{ + cred_t *cr; + int error; + + cr = (cred_t *)get_current_cred(); + error = -zfs_rename(sdip, dname(sdentry), tdip, dname(tdentry), cr, 0); + put_cred(cr); + ASSERT3S(error, <=, 0); + + return (error); +} + +static int +zpl_symlink(struct inode *dir, struct dentry *dentry, const char *name) +{ + cred_t *cr; + vattr_t *vap; + struct inode *ip; + int error; + + cr = (cred_t *)get_current_cred(); + vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP); + vap->va_mode = S_IFLNK | S_IRWXUGO; + vap->va_mask = ATTR_MODE; + vap->va_uid = current_fsuid(); + vap->va_gid = current_fsgid(); + + error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0); + if (error) + goto out; + + d_instantiate(dentry, ip); +out: + kmem_free(vap, sizeof(vattr_t)); + put_cred(cr); + ASSERT3S(error, <=, 0); + + return (error); +} + +static void * +zpl_follow_link(struct dentry *dentry, struct nameidata *nd) +{ + (void) zfs_follow_link(dentry, nd); + return NULL; +} + +static void +zpl_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) +{ + char *link; + + link = nd_get_link(nd); + if (!IS_ERR(link)) + kmem_free(link, MAXPATHLEN + 1); +} + +static int +zpl_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) +{ + struct inode *ip = old_dentry->d_inode; + cred_t *cr; + int error; + + if (ip->i_nlink >= ZFS_LINK_MAX) + return -EMLINK; + + cr = (cred_t *)get_current_cred(); + ip->i_ctime = CURRENT_TIME_SEC; + igrab(ip); /* Use ihold() if available */ + + error = -zfs_link(dir, ip, dname(dentry), cr); + if (error) { + iput(ip); + goto out; + } + + d_instantiate(dentry, ip); +out: + put_cred(cr); + ASSERT3S(error, <=, 0); + + return (error); +} + +const struct inode_operations zpl_inode_operations = { + .check_acl = NULL, + .create = zpl_create, + .link = zpl_link, + .unlink = zpl_unlink, + .symlink = zpl_symlink, + .mkdir = zpl_mkdir, + .rmdir = zpl_rmdir, + .mknod = zpl_mknod, + .rename = zpl_rename, + .setattr = zpl_setattr, + .getattr = zpl_getattr, + .setxattr = generic_setxattr, + .getxattr = generic_getxattr, + .removexattr = generic_removexattr, + .listxattr = zpl_xattr_list, +}; + +const struct inode_operations zpl_dir_inode_operations = { + .check_acl = NULL, + .create = zpl_create, + .lookup = zpl_lookup, + .link = zpl_link, + .unlink = zpl_unlink, + .symlink = zpl_symlink, + .mkdir = zpl_mkdir, + .rmdir = zpl_rmdir, + .mknod = zpl_mknod, + .rename = zpl_rename, + .setattr = zpl_setattr, +}; + +const struct inode_operations zpl_symlink_inode_operations = { + .check_acl = NULL, + .readlink = generic_readlink, + .follow_link = zpl_follow_link, + .put_link = zpl_put_link, +}; + +const struct inode_operations zpl_special_inode_operations = { + .check_acl = NULL, +};