/* * linux/fs/9p/vfs_inode_dotl.c * * This file contains vfs inode ops for the 9P2000.L protocol. * * Copyright (C) 2004 by Eric Van Hensbergen * Copyright (C) 2002 by Ron Minnich * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to: * Free Software Foundation * 51 Franklin Street, Fifth Floor * Boston, MA 02111-1301 USA * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "v9fs.h" #include "v9fs_vfs.h" #include "fid.h" #include "cache.h" #include "xattr.h" #include "acl.h" static int v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode, dev_t rdev); /** * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a * new file system object. This checks the S_ISGID to determine the owning * group of the new file system object. */ static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode) { BUG_ON(dir_inode == NULL); if (dir_inode->i_mode & S_ISGID) { /* set_gid bit is set.*/ return dir_inode->i_gid; } return current_fsgid(); } /** * v9fs_dentry_from_dir_inode - helper function to get the dentry from * dir inode. * */ static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode) { struct dentry *dentry; spin_lock(&inode->i_lock); /* Directory should have only one entry. */ BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry)); dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias); spin_unlock(&inode->i_lock); return dentry; } struct inode * v9fs_inode_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, struct super_block *sb) { struct inode *ret = NULL; int err; struct p9_stat_dotl *st; st = p9_client_getattr_dotl(fid, P9_STATS_BASIC); if (IS_ERR(st)) return ERR_CAST(st); ret = v9fs_get_inode(sb, st->st_mode); if (IS_ERR(ret)) { err = PTR_ERR(ret); goto error; } v9fs_stat2inode_dotl(st, ret); ret->i_ino = v9fs_qid2ino(&st->qid); #ifdef CONFIG_9P_FSCACHE v9fs_vcookie_set_qid(ret, &st->qid); v9fs_cache_inode_get_cookie(ret); #endif err = v9fs_get_acl(ret, fid); if (err) { iput(ret); goto error; } kfree(st); return ret; error: kfree(st); return ERR_PTR(err); } /** * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. * @dir: directory inode that is being created * @dentry: dentry that is being deleted * @mode: create permissions * @nd: path information * */ static int v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode, struct nameidata *nd) { int err = 0; char *name = NULL; gid_t gid; int flags; mode_t mode; struct v9fs_session_info *v9ses; struct p9_fid *fid = NULL; struct p9_fid *dfid, *ofid; struct file *filp; struct p9_qid qid; struct inode *inode; struct posix_acl *pacl = NULL, *dacl = NULL; v9ses = v9fs_inode2v9ses(dir); if (nd && nd->flags & LOOKUP_OPEN) flags = nd->intent.open.flags - 1; else { /* * create call without LOOKUP_OPEN is due * to mknod of regular files. So use mknod * operation. */ return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0); } name = (char *) dentry->d_name.name; P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x " "mode:0x%x\n", name, flags, omode); dfid = v9fs_fid_lookup(dentry->d_parent); if (IS_ERR(dfid)) { err = PTR_ERR(dfid); P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); return err; } /* clone a fid to use for creation */ ofid = p9_client_walk(dfid, 0, NULL, 1); if (IS_ERR(ofid)) { err = PTR_ERR(ofid); P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); return err; } gid = v9fs_get_fsgid_for_create(dir); mode = omode; /* Update mode based on ACL value */ err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); if (err) { P9_DPRINTK(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n", err); goto error; } err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid); if (err < 0) { P9_DPRINTK(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n", err); goto error; } /* instantiate inode and assign the unopened fid to the dentry */ fid = p9_client_walk(dfid, 1, &name, 1); if (IS_ERR(fid)) { err = PTR_ERR(fid); P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); fid = NULL; goto error; } inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); if (IS_ERR(inode)) { err = PTR_ERR(inode); P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); goto error; } d_instantiate(dentry, inode); err = v9fs_fid_add(dentry, fid); if (err < 0) goto error; /* Now set the ACL based on the default value */ v9fs_set_create_acl(dentry, dacl, pacl); /* Since we are opening a file, assign the open fid to the file */ filp = lookup_instantiate_filp(nd, dentry, generic_file_open); if (IS_ERR(filp)) { p9_client_clunk(ofid); return PTR_ERR(filp); } filp->private_data = ofid; return 0; error: if (ofid) p9_client_clunk(ofid); if (fid) p9_client_clunk(fid); return err; } /** * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory * @dir: inode that is being unlinked * @dentry: dentry that is being unlinked * @mode: mode for new directory * */ static int v9fs_vfs_mkdir_dotl(struct inode *dir, struct dentry *dentry, int omode) { int err; struct v9fs_session_info *v9ses; struct p9_fid *fid = NULL, *dfid = NULL; gid_t gid; char *name; mode_t mode; struct inode *inode; struct p9_qid qid; struct dentry *dir_dentry; struct posix_acl *dacl = NULL, *pacl = NULL; P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); err = 0; v9ses = v9fs_inode2v9ses(dir); omode |= S_IFDIR; if (dir->i_mode & S_ISGID) omode |= S_ISGID; dir_dentry = v9fs_dentry_from_dir_inode(dir); dfid = v9fs_fid_lookup(dir_dentry); if (IS_ERR(dfid)) { err = PTR_ERR(dfid); P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); dfid = NULL; goto error; } gid = v9fs_get_fsgid_for_create(dir); mode = omode; /* Update mode based on ACL value */ err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); if (err) { P9_DPRINTK(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", err); goto error; } name = (char *) dentry->d_name.name; err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); if (err < 0) goto error; /* instantiate inode and assign the unopened fid to the dentry */ if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { fid = p9_client_walk(dfid, 1, &name, 1); if (IS_ERR(fid)) { err = PTR_ERR(fid); P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); fid = NULL; goto error; } inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); if (IS_ERR(inode)) { err = PTR_ERR(inode); P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); goto error; } d_instantiate(dentry, inode); err = v9fs_fid_add(dentry, fid); if (err < 0) goto error; fid = NULL; } else { /* * Not in cached mode. No need to populate * inode with stat. We need to get an inode * so that we can set the acl with dentry */ inode = v9fs_get_inode(dir->i_sb, mode); if (IS_ERR(inode)) { err = PTR_ERR(inode); goto error; } d_instantiate(dentry, inode); } /* Now set the ACL based on the default value */ v9fs_set_create_acl(dentry, dacl, pacl); error: if (fid) p9_client_clunk(fid); return err; } static int v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) { int err; struct v9fs_session_info *v9ses; struct p9_fid *fid; struct p9_stat_dotl *st; P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); err = -EPERM; v9ses = v9fs_inode2v9ses(dentry->d_inode); if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) return simple_getattr(mnt, dentry, stat); fid = v9fs_fid_lookup(dentry); if (IS_ERR(fid)) return PTR_ERR(fid); /* Ask for all the fields in stat structure. Server will return * whatever it supports */ st = p9_client_getattr_dotl(fid, P9_STATS_ALL); if (IS_ERR(st)) return PTR_ERR(st); v9fs_stat2inode_dotl(st, dentry->d_inode); generic_fillattr(dentry->d_inode, stat); /* Change block size to what the server returned */ stat->blksize = st->st_blksize; kfree(st); return 0; } /** * v9fs_vfs_setattr_dotl - set file metadata * @dentry: file whose metadata to set * @iattr: metadata assignment structure * */ int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) { int retval; struct v9fs_session_info *v9ses; struct p9_fid *fid; struct p9_iattr_dotl p9attr; P9_DPRINTK(P9_DEBUG_VFS, "\n"); retval = inode_change_ok(dentry->d_inode, iattr); if (retval) return retval; p9attr.valid = iattr->ia_valid; p9attr.mode = iattr->ia_mode; p9attr.uid = iattr->ia_uid; p9attr.gid = iattr->ia_gid; p9attr.size = iattr->ia_size; p9attr.atime_sec = iattr->ia_atime.tv_sec; p9attr.atime_nsec = iattr->ia_atime.tv_nsec; p9attr.mtime_sec = iattr->ia_mtime.tv_sec; p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; retval = -EPERM; v9ses = v9fs_inode2v9ses(dentry->d_inode); fid = v9fs_fid_lookup(dentry); if (IS_ERR(fid)) return PTR_ERR(fid); retval = p9_client_setattr(fid, &p9attr); if (retval < 0) return retval; if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size != i_size_read(dentry->d_inode)) { retval = vmtruncate(dentry->d_inode, iattr->ia_size); if (retval) return retval; } setattr_copy(dentry->d_inode, iattr); mark_inode_dirty(dentry->d_inode); if (iattr->ia_valid & ATTR_MODE) { /* We also want to update ACL when we update mode bits */ retval = v9fs_acl_chmod(dentry); if (retval < 0) return retval; } return 0; } /** * v9fs_stat2inode_dotl - populate an inode structure with stat info * @stat: stat structure * @inode: inode to populate * @sb: superblock of filesystem * */ void v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode) { if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { inode->i_atime.tv_sec = stat->st_atime_sec; inode->i_atime.tv_nsec = stat->st_atime_nsec; inode->i_mtime.tv_sec = stat->st_mtime_sec; inode->i_mtime.tv_nsec = stat->st_mtime_nsec; inode->i_ctime.tv_sec = stat->st_ctime_sec; inode->i_ctime.tv_nsec = stat->st_ctime_nsec; inode->i_uid = stat->st_uid; inode->i_gid = stat->st_gid; inode->i_nlink = stat->st_nlink; inode->i_mode = stat->st_mode; inode->i_rdev = new_decode_dev(stat->st_rdev); if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) init_special_inode(inode, inode->i_mode, inode->i_rdev); i_size_write(inode, stat->st_size); inode->i_blocks = stat->st_blocks; } else { if (stat->st_result_mask & P9_STATS_ATIME) { inode->i_atime.tv_sec = stat->st_atime_sec; inode->i_atime.tv_nsec = stat->st_atime_nsec; } if (stat->st_result_mask & P9_STATS_MTIME) { inode->i_mtime.tv_sec = stat->st_mtime_sec; inode->i_mtime.tv_nsec = stat->st_mtime_nsec; } if (stat->st_result_mask & P9_STATS_CTIME) { inode->i_ctime.tv_sec = stat->st_ctime_sec; inode->i_ctime.tv_nsec = stat->st_ctime_nsec; } if (stat->st_result_mask & P9_STATS_UID) inode->i_uid = stat->st_uid; if (stat->st_result_mask & P9_STATS_GID) inode->i_gid = stat->st_gid; if (stat->st_result_mask & P9_STATS_NLINK) inode->i_nlink = stat->st_nlink; if (stat->st_result_mask & P9_STATS_MODE) { inode->i_mode = stat->st_mode; if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) init_special_inode(inode, inode->i_mode, inode->i_rdev); } if (stat->st_result_mask & P9_STATS_RDEV) inode->i_rdev = new_decode_dev(stat->st_rdev); if (stat->st_result_mask & P9_STATS_SIZE) i_size_write(inode, stat->st_size); if (stat->st_result_mask & P9_STATS_BLOCKS) inode->i_blocks = stat->st_blocks; } if (stat->st_result_mask & P9_STATS_GEN) inode->i_generation = stat->st_gen; /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION * because the inode structure does not have fields for them. */ } static int v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, const char *symname) { struct v9fs_session_info *v9ses; struct p9_fid *dfid; struct p9_fid *fid = NULL; struct inode *inode; struct p9_qid qid; char *name; int err; gid_t gid; name = (char *) dentry->d_name.name; P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n", dir->i_ino, name, symname); v9ses = v9fs_inode2v9ses(dir); dfid = v9fs_fid_lookup(dentry->d_parent); if (IS_ERR(dfid)) { err = PTR_ERR(dfid); P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); return err; } gid = v9fs_get_fsgid_for_create(dir); /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid); if (err < 0) { P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); goto error; } if (v9ses->cache) { /* Now walk from the parent so we can get an unopened fid. */ fid = p9_client_walk(dfid, 1, &name, 1); if (IS_ERR(fid)) { err = PTR_ERR(fid); P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); fid = NULL; goto error; } /* instantiate inode and assign the unopened fid to dentry */ inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); if (IS_ERR(inode)) { err = PTR_ERR(inode); P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); goto error; } d_instantiate(dentry, inode); err = v9fs_fid_add(dentry, fid); if (err < 0) goto error; fid = NULL; } else { /* Not in cached mode. No need to populate inode with stat */ inode = v9fs_get_inode(dir->i_sb, S_IFLNK); if (IS_ERR(inode)) { err = PTR_ERR(inode); goto error; } d_instantiate(dentry, inode); } error: if (fid) p9_client_clunk(fid); return err; } /** * v9fs_vfs_link_dotl - create a hardlink for dotl * @old_dentry: dentry for file to link to * @dir: inode destination for new link * @dentry: dentry for link * */ static int v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) { int err; struct p9_fid *dfid, *oldfid; char *name; struct v9fs_session_info *v9ses; struct dentry *dir_dentry; P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n", dir->i_ino, old_dentry->d_name.name, dentry->d_name.name); v9ses = v9fs_inode2v9ses(dir); dir_dentry = v9fs_dentry_from_dir_inode(dir); dfid = v9fs_fid_lookup(dir_dentry); if (IS_ERR(dfid)) return PTR_ERR(dfid); oldfid = v9fs_fid_lookup(old_dentry); if (IS_ERR(oldfid)) return PTR_ERR(oldfid); name = (char *) dentry->d_name.name; err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name); if (err < 0) { P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); return err; } if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { /* Get the latest stat info from server. */ struct p9_fid *fid; struct p9_stat_dotl *st; fid = v9fs_fid_lookup(old_dentry); if (IS_ERR(fid)) return PTR_ERR(fid); st = p9_client_getattr_dotl(fid, P9_STATS_BASIC); if (IS_ERR(st)) return PTR_ERR(st); v9fs_stat2inode_dotl(st, old_dentry->d_inode); kfree(st); } else { /* Caching disabled. No need to get upto date stat info. * This dentry will be released immediately. So, just hold the * inode */ ihold(old_dentry->d_inode); } d_instantiate(dentry, old_dentry->d_inode); return err; } /** * v9fs_vfs_mknod_dotl - create a special file * @dir: inode destination for new link * @dentry: dentry for file * @mode: mode for creation * @rdev: device associated with special file * */ static int v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode, dev_t rdev) { int err; char *name; mode_t mode; struct v9fs_session_info *v9ses; struct p9_fid *fid = NULL, *dfid = NULL; struct inode *inode; gid_t gid; struct p9_qid qid; struct dentry *dir_dentry; struct posix_acl *dacl = NULL, *pacl = NULL; P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev)); if (!new_valid_dev(rdev)) return -EINVAL; v9ses = v9fs_inode2v9ses(dir); dir_dentry = v9fs_dentry_from_dir_inode(dir); dfid = v9fs_fid_lookup(dir_dentry); if (IS_ERR(dfid)) { err = PTR_ERR(dfid); P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); dfid = NULL; goto error; } gid = v9fs_get_fsgid_for_create(dir); mode = omode; /* Update mode based on ACL value */ err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); if (err) { P9_DPRINTK(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", err); goto error; } name = (char *) dentry->d_name.name; err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); if (err < 0) goto error; /* instantiate inode and assign the unopened fid to the dentry */ if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { fid = p9_client_walk(dfid, 1, &name, 1); if (IS_ERR(fid)) { err = PTR_ERR(fid); P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); fid = NULL; goto error; } inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); if (IS_ERR(inode)) { err = PTR_ERR(inode); P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); goto error; } d_instantiate(dentry, inode); err = v9fs_fid_add(dentry, fid); if (err < 0) goto error; fid = NULL; } else { /* * Not in cached mode. No need to populate inode with stat. * socket syscall returns a fd, so we need instantiate */ inode = v9fs_get_inode(dir->i_sb, mode); if (IS_ERR(inode)) { err = PTR_ERR(inode); goto error; } d_instantiate(dentry, inode); } /* Now set the ACL based on the default value */ v9fs_set_create_acl(dentry, dacl, pacl); error: if (fid) p9_client_clunk(fid); return err; } /** * v9fs_vfs_follow_link_dotl - follow a symlink path * @dentry: dentry for symlink * @nd: nameidata * */ static void * v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd) { int retval; struct p9_fid *fid; char *link = __getname(); char *target; P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name); if (!link) { link = ERR_PTR(-ENOMEM); goto ndset; } fid = v9fs_fid_lookup(dentry); if (IS_ERR(fid)) { __putname(link); link = ERR_PTR(PTR_ERR(fid)); goto ndset; } retval = p9_client_readlink(fid, &target); if (!retval) { strcpy(link, target); kfree(target); goto ndset; } __putname(link); link = ERR_PTR(retval); ndset: nd_set_link(nd, link); return NULL; } const struct inode_operations v9fs_dir_inode_operations_dotl = { .create = v9fs_vfs_create_dotl, .lookup = v9fs_vfs_lookup, .link = v9fs_vfs_link_dotl, .symlink = v9fs_vfs_symlink_dotl, .unlink = v9fs_vfs_unlink, .mkdir = v9fs_vfs_mkdir_dotl, .rmdir = v9fs_vfs_rmdir, .mknod = v9fs_vfs_mknod_dotl, .rename = v9fs_vfs_rename, .getattr = v9fs_vfs_getattr_dotl, .setattr = v9fs_vfs_setattr_dotl, .setxattr = generic_setxattr, .getxattr = generic_getxattr, .removexattr = generic_removexattr, .listxattr = v9fs_listxattr, .check_acl = v9fs_check_acl, }; const struct inode_operations v9fs_file_inode_operations_dotl = { .getattr = v9fs_vfs_getattr_dotl, .setattr = v9fs_vfs_setattr_dotl, .setxattr = generic_setxattr, .getxattr = generic_getxattr, .removexattr = generic_removexattr, .listxattr = v9fs_listxattr, .check_acl = v9fs_check_acl, }; const struct inode_operations v9fs_symlink_inode_operations_dotl = { .readlink = generic_readlink, .follow_link = v9fs_vfs_follow_link_dotl, .put_link = v9fs_vfs_put_link, .getattr = v9fs_vfs_getattr_dotl, .setattr = v9fs_vfs_setattr_dotl, .setxattr = generic_setxattr, .getxattr = generic_getxattr, .removexattr = generic_removexattr, .listxattr = v9fs_listxattr, };