| /* |
| * linux/fs/9p/vfs_inode.c |
| * |
| * This file contains vfs inode ops for the 9P2000 protocol. |
| * |
| * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
| * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
| * |
| * 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 |
| * |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/module.h> |
| #include <linux/errno.h> |
| #include <linux/fs.h> |
| #include <linux/file.h> |
| #include <linux/pagemap.h> |
| #include <linux/stat.h> |
| #include <linux/string.h> |
| #include <linux/inet.h> |
| #include <linux/namei.h> |
| #include <linux/idr.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/xattr.h> |
| #include <linux/posix_acl.h> |
| #include <net/9p/9p.h> |
| #include <net/9p/client.h> |
| |
| #include "v9fs.h" |
| #include "v9fs_vfs.h" |
| #include "fid.h" |
| #include "cache.h" |
| #include "xattr.h" |
| #include "acl.h" |
| |
| static const struct inode_operations v9fs_dir_inode_operations; |
| static const struct inode_operations v9fs_dir_inode_operations_dotu; |
| static const struct inode_operations v9fs_file_inode_operations; |
| static const struct inode_operations v9fs_symlink_inode_operations; |
| |
| /** |
| * unixmode2p9mode - convert unix mode bits to plan 9 |
| * @v9ses: v9fs session information |
| * @mode: mode to convert |
| * |
| */ |
| |
| static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode) |
| { |
| int res; |
| res = mode & 0777; |
| if (S_ISDIR(mode)) |
| res |= P9_DMDIR; |
| if (v9fs_proto_dotu(v9ses)) { |
| if (v9ses->nodev == 0) { |
| if (S_ISSOCK(mode)) |
| res |= P9_DMSOCKET; |
| if (S_ISFIFO(mode)) |
| res |= P9_DMNAMEDPIPE; |
| if (S_ISBLK(mode)) |
| res |= P9_DMDEVICE; |
| if (S_ISCHR(mode)) |
| res |= P9_DMDEVICE; |
| } |
| |
| if ((mode & S_ISUID) == S_ISUID) |
| res |= P9_DMSETUID; |
| if ((mode & S_ISGID) == S_ISGID) |
| res |= P9_DMSETGID; |
| if ((mode & S_ISVTX) == S_ISVTX) |
| res |= P9_DMSETVTX; |
| } |
| return res; |
| } |
| |
| /** |
| * p9mode2perm- convert plan9 mode bits to unix permission bits |
| * @v9ses: v9fs session information |
| * @stat: p9_wstat from which mode need to be derived |
| * |
| */ |
| static int p9mode2perm(struct v9fs_session_info *v9ses, |
| struct p9_wstat *stat) |
| { |
| int res; |
| int mode = stat->mode; |
| |
| res = mode & S_IALLUGO; |
| if (v9fs_proto_dotu(v9ses)) { |
| if ((mode & P9_DMSETUID) == P9_DMSETUID) |
| res |= S_ISUID; |
| |
| if ((mode & P9_DMSETGID) == P9_DMSETGID) |
| res |= S_ISGID; |
| |
| if ((mode & P9_DMSETVTX) == P9_DMSETVTX) |
| res |= S_ISVTX; |
| } |
| return res; |
| } |
| |
| /** |
| * p9mode2unixmode- convert plan9 mode bits to unix mode bits |
| * @v9ses: v9fs session information |
| * @stat: p9_wstat from which mode need to be derived |
| * @rdev: major number, minor number in case of device files. |
| * |
| */ |
| static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses, |
| struct p9_wstat *stat, dev_t *rdev) |
| { |
| int res; |
| u32 mode = stat->mode; |
| |
| *rdev = 0; |
| res = p9mode2perm(v9ses, stat); |
| |
| if ((mode & P9_DMDIR) == P9_DMDIR) |
| res |= S_IFDIR; |
| else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) |
| res |= S_IFLNK; |
| else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) |
| && (v9ses->nodev == 0)) |
| res |= S_IFSOCK; |
| else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) |
| && (v9ses->nodev == 0)) |
| res |= S_IFIFO; |
| else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) |
| && (v9ses->nodev == 0)) { |
| char type = 0, ext[32]; |
| int major = -1, minor = -1; |
| |
| strlcpy(ext, stat->extension, sizeof(ext)); |
| sscanf(ext, "%c %i %i", &type, &major, &minor); |
| switch (type) { |
| case 'c': |
| res |= S_IFCHR; |
| break; |
| case 'b': |
| res |= S_IFBLK; |
| break; |
| default: |
| p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n", |
| type, stat->extension); |
| }; |
| *rdev = MKDEV(major, minor); |
| } else |
| res |= S_IFREG; |
| |
| return res; |
| } |
| |
| /** |
| * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits |
| * @uflags: flags to convert |
| * @extended: if .u extensions are active |
| */ |
| |
| int v9fs_uflags2omode(int uflags, int extended) |
| { |
| int ret; |
| |
| ret = 0; |
| switch (uflags&3) { |
| default: |
| case O_RDONLY: |
| ret = P9_OREAD; |
| break; |
| |
| case O_WRONLY: |
| ret = P9_OWRITE; |
| break; |
| |
| case O_RDWR: |
| ret = P9_ORDWR; |
| break; |
| } |
| |
| if (extended) { |
| if (uflags & O_EXCL) |
| ret |= P9_OEXCL; |
| |
| if (uflags & O_APPEND) |
| ret |= P9_OAPPEND; |
| } |
| |
| return ret; |
| } |
| |
| /** |
| * v9fs_blank_wstat - helper function to setup a 9P stat structure |
| * @wstat: structure to initialize |
| * |
| */ |
| |
| void |
| v9fs_blank_wstat(struct p9_wstat *wstat) |
| { |
| wstat->type = ~0; |
| wstat->dev = ~0; |
| wstat->qid.type = ~0; |
| wstat->qid.version = ~0; |
| *((long long *)&wstat->qid.path) = ~0; |
| wstat->mode = ~0; |
| wstat->atime = ~0; |
| wstat->mtime = ~0; |
| wstat->length = ~0; |
| wstat->name = NULL; |
| wstat->uid = NULL; |
| wstat->gid = NULL; |
| wstat->muid = NULL; |
| wstat->n_uid = INVALID_UID; |
| wstat->n_gid = INVALID_GID; |
| wstat->n_muid = INVALID_UID; |
| wstat->extension = NULL; |
| } |
| |
| /** |
| * v9fs_alloc_inode - helper function to allocate an inode |
| * |
| */ |
| struct inode *v9fs_alloc_inode(struct super_block *sb) |
| { |
| struct v9fs_inode *v9inode; |
| v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache, |
| GFP_KERNEL); |
| if (!v9inode) |
| return NULL; |
| #ifdef CONFIG_9P_FSCACHE |
| v9inode->fscache = NULL; |
| mutex_init(&v9inode->fscache_lock); |
| #endif |
| v9inode->writeback_fid = NULL; |
| v9inode->cache_validity = 0; |
| mutex_init(&v9inode->v_mutex); |
| return &v9inode->vfs_inode; |
| } |
| |
| /** |
| * v9fs_destroy_inode - destroy an inode |
| * |
| */ |
| |
| static void v9fs_i_callback(struct rcu_head *head) |
| { |
| struct inode *inode = container_of(head, struct inode, i_rcu); |
| kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); |
| } |
| |
| void v9fs_destroy_inode(struct inode *inode) |
| { |
| call_rcu(&inode->i_rcu, v9fs_i_callback); |
| } |
| |
| int v9fs_init_inode(struct v9fs_session_info *v9ses, |
| struct inode *inode, umode_t mode, dev_t rdev) |
| { |
| int err = 0; |
| |
| inode_init_owner(inode, NULL, mode); |
| inode->i_blocks = 0; |
| inode->i_rdev = rdev; |
| inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
| inode->i_mapping->a_ops = &v9fs_addr_operations; |
| |
| switch (mode & S_IFMT) { |
| case S_IFIFO: |
| case S_IFBLK: |
| case S_IFCHR: |
| case S_IFSOCK: |
| if (v9fs_proto_dotl(v9ses)) { |
| inode->i_op = &v9fs_file_inode_operations_dotl; |
| } else if (v9fs_proto_dotu(v9ses)) { |
| inode->i_op = &v9fs_file_inode_operations; |
| } else { |
| p9_debug(P9_DEBUG_ERROR, |
| "special files without extended mode\n"); |
| err = -EINVAL; |
| goto error; |
| } |
| init_special_inode(inode, inode->i_mode, inode->i_rdev); |
| break; |
| case S_IFREG: |
| if (v9fs_proto_dotl(v9ses)) { |
| inode->i_op = &v9fs_file_inode_operations_dotl; |
| if (v9ses->cache == CACHE_LOOSE || |
| v9ses->cache == CACHE_FSCACHE) |
| inode->i_fop = |
| &v9fs_cached_file_operations_dotl; |
| else if (v9ses->cache == CACHE_MMAP) |
| inode->i_fop = &v9fs_mmap_file_operations_dotl; |
| else |
| inode->i_fop = &v9fs_file_operations_dotl; |
| } else { |
| inode->i_op = &v9fs_file_inode_operations; |
| if (v9ses->cache == CACHE_LOOSE || |
| v9ses->cache == CACHE_FSCACHE) |
| inode->i_fop = |
| &v9fs_cached_file_operations; |
| else if (v9ses->cache == CACHE_MMAP) |
| inode->i_fop = &v9fs_mmap_file_operations; |
| else |
| inode->i_fop = &v9fs_file_operations; |
| } |
| |
| break; |
| case S_IFLNK: |
| if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { |
| p9_debug(P9_DEBUG_ERROR, |
| "extended modes used with legacy protocol\n"); |
| err = -EINVAL; |
| goto error; |
| } |
| |
| if (v9fs_proto_dotl(v9ses)) |
| inode->i_op = &v9fs_symlink_inode_operations_dotl; |
| else |
| inode->i_op = &v9fs_symlink_inode_operations; |
| |
| break; |
| case S_IFDIR: |
| inc_nlink(inode); |
| if (v9fs_proto_dotl(v9ses)) |
| inode->i_op = &v9fs_dir_inode_operations_dotl; |
| else if (v9fs_proto_dotu(v9ses)) |
| inode->i_op = &v9fs_dir_inode_operations_dotu; |
| else |
| inode->i_op = &v9fs_dir_inode_operations; |
| |
| if (v9fs_proto_dotl(v9ses)) |
| inode->i_fop = &v9fs_dir_operations_dotl; |
| else |
| inode->i_fop = &v9fs_dir_operations; |
| |
| break; |
| default: |
| p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", |
| mode, mode & S_IFMT); |
| err = -EINVAL; |
| goto error; |
| } |
| error: |
| return err; |
| |
| } |
| |
| /** |
| * v9fs_get_inode - helper function to setup an inode |
| * @sb: superblock |
| * @mode: mode to setup inode with |
| * |
| */ |
| |
| struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) |
| { |
| int err; |
| struct inode *inode; |
| struct v9fs_session_info *v9ses = sb->s_fs_info; |
| |
| p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); |
| |
| inode = new_inode(sb); |
| if (!inode) { |
| pr_warn("%s (%d): Problem allocating inode\n", |
| __func__, task_pid_nr(current)); |
| return ERR_PTR(-ENOMEM); |
| } |
| err = v9fs_init_inode(v9ses, inode, mode, rdev); |
| if (err) { |
| iput(inode); |
| return ERR_PTR(err); |
| } |
| return inode; |
| } |
| |
| /* |
| static struct v9fs_fid* |
| v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) |
| { |
| int err; |
| int nfid; |
| struct v9fs_fid *ret; |
| struct v9fs_fcall *fcall; |
| |
| nfid = v9fs_get_idpool(&v9ses->fidpool); |
| if (nfid < 0) { |
| eprintk(KERN_WARNING, "no free fids available\n"); |
| return ERR_PTR(-ENOSPC); |
| } |
| |
| err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
| &fcall); |
| |
| if (err < 0) { |
| if (fcall && fcall->id == RWALK) |
| goto clunk_fid; |
| |
| PRINT_FCALL_ERROR("walk error", fcall); |
| v9fs_put_idpool(nfid, &v9ses->fidpool); |
| goto error; |
| } |
| |
| kfree(fcall); |
| fcall = NULL; |
| ret = v9fs_fid_create(v9ses, nfid); |
| if (!ret) { |
| err = -ENOMEM; |
| goto clunk_fid; |
| } |
| |
| err = v9fs_fid_insert(ret, dentry); |
| if (err < 0) { |
| v9fs_fid_destroy(ret); |
| goto clunk_fid; |
| } |
| |
| return ret; |
| |
| clunk_fid: |
| v9fs_t_clunk(v9ses, nfid); |
| |
| error: |
| kfree(fcall); |
| return ERR_PTR(err); |
| } |
| */ |
| |
| |
| /** |
| * v9fs_clear_inode - release an inode |
| * @inode: inode to release |
| * |
| */ |
| void v9fs_evict_inode(struct inode *inode) |
| { |
| struct v9fs_inode *v9inode = V9FS_I(inode); |
| |
| truncate_inode_pages_final(&inode->i_data); |
| clear_inode(inode); |
| filemap_fdatawrite(&inode->i_data); |
| |
| v9fs_cache_inode_put_cookie(inode); |
| /* clunk the fid stashed in writeback_fid */ |
| if (v9inode->writeback_fid) { |
| p9_client_clunk(v9inode->writeback_fid); |
| v9inode->writeback_fid = NULL; |
| } |
| } |
| |
| static int v9fs_test_inode(struct inode *inode, void *data) |
| { |
| int umode; |
| dev_t rdev; |
| struct v9fs_inode *v9inode = V9FS_I(inode); |
| struct p9_wstat *st = (struct p9_wstat *)data; |
| struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); |
| |
| umode = p9mode2unixmode(v9ses, st, &rdev); |
| /* don't match inode of different type */ |
| if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) |
| return 0; |
| |
| /* compare qid details */ |
| if (memcmp(&v9inode->qid.version, |
| &st->qid.version, sizeof(v9inode->qid.version))) |
| return 0; |
| |
| if (v9inode->qid.type != st->qid.type) |
| return 0; |
| |
| if (v9inode->qid.path != st->qid.path) |
| return 0; |
| return 1; |
| } |
| |
| static int v9fs_test_new_inode(struct inode *inode, void *data) |
| { |
| return 0; |
| } |
| |
| static int v9fs_set_inode(struct inode *inode, void *data) |
| { |
| struct v9fs_inode *v9inode = V9FS_I(inode); |
| struct p9_wstat *st = (struct p9_wstat *)data; |
| |
| memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); |
| return 0; |
| } |
| |
| static struct inode *v9fs_qid_iget(struct super_block *sb, |
| struct p9_qid *qid, |
| struct p9_wstat *st, |
| int new) |
| { |
| dev_t rdev; |
| int retval; |
| umode_t umode; |
| unsigned long i_ino; |
| struct inode *inode; |
| struct v9fs_session_info *v9ses = sb->s_fs_info; |
| int (*test)(struct inode *, void *); |
| |
| if (new) |
| test = v9fs_test_new_inode; |
| else |
| test = v9fs_test_inode; |
| |
| i_ino = v9fs_qid2ino(qid); |
| inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); |
| if (!inode) |
| return ERR_PTR(-ENOMEM); |
| if (!(inode->i_state & I_NEW)) |
| return inode; |
| /* |
| * initialize the inode with the stat info |
| * FIXME!! we may need support for stale inodes |
| * later. |
| */ |
| inode->i_ino = i_ino; |
| umode = p9mode2unixmode(v9ses, st, &rdev); |
| retval = v9fs_init_inode(v9ses, inode, umode, rdev); |
| if (retval) |
| goto error; |
| |
| v9fs_stat2inode(st, inode, sb); |
| v9fs_cache_inode_get_cookie(inode); |
| unlock_new_inode(inode); |
| return inode; |
| error: |
| iget_failed(inode); |
| return ERR_PTR(retval); |
| |
| } |
| |
| struct inode * |
| v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
| struct super_block *sb, int new) |
| { |
| struct p9_wstat *st; |
| struct inode *inode = NULL; |
| |
| st = p9_client_stat(fid); |
| if (IS_ERR(st)) |
| return ERR_CAST(st); |
| |
| inode = v9fs_qid_iget(sb, &st->qid, st, new); |
| p9stat_free(st); |
| kfree(st); |
| return inode; |
| } |
| |
| /** |
| * v9fs_at_to_dotl_flags- convert Linux specific AT flags to |
| * plan 9 AT flag. |
| * @flags: flags to convert |
| */ |
| static int v9fs_at_to_dotl_flags(int flags) |
| { |
| int rflags = 0; |
| if (flags & AT_REMOVEDIR) |
| rflags |= P9_DOTL_AT_REMOVEDIR; |
| return rflags; |
| } |
| |
| /** |
| * v9fs_dec_count - helper functon to drop i_nlink. |
| * |
| * If a directory had nlink <= 2 (including . and ..), then we should not drop |
| * the link count, which indicates the underlying exported fs doesn't maintain |
| * nlink accurately. e.g. |
| * - overlayfs sets nlink to 1 for merged dir |
| * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more |
| * than EXT4_LINK_MAX (65000) links. |
| * |
| * @inode: inode whose nlink is being dropped |
| */ |
| static void v9fs_dec_count(struct inode *inode) |
| { |
| if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) |
| drop_nlink(inode); |
| } |
| |
| /** |
| * v9fs_remove - helper function to remove files and directories |
| * @dir: directory inode that is being deleted |
| * @dentry: dentry that is being deleted |
| * @flags: removing a directory |
| * |
| */ |
| |
| static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) |
| { |
| struct inode *inode; |
| int retval = -EOPNOTSUPP; |
| struct p9_fid *v9fid, *dfid; |
| struct v9fs_session_info *v9ses; |
| |
| p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", |
| dir, dentry, flags); |
| |
| v9ses = v9fs_inode2v9ses(dir); |
| inode = d_inode(dentry); |
| dfid = v9fs_parent_fid(dentry); |
| if (IS_ERR(dfid)) { |
| retval = PTR_ERR(dfid); |
| p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); |
| return retval; |
| } |
| if (v9fs_proto_dotl(v9ses)) |
| retval = p9_client_unlinkat(dfid, dentry->d_name.name, |
| v9fs_at_to_dotl_flags(flags)); |
| if (retval == -EOPNOTSUPP) { |
| /* Try the one based on path */ |
| v9fid = v9fs_fid_clone(dentry); |
| if (IS_ERR(v9fid)) |
| return PTR_ERR(v9fid); |
| retval = p9_client_remove(v9fid); |
| } |
| if (!retval) { |
| /* |
| * directories on unlink should have zero |
| * link count |
| */ |
| if (flags & AT_REMOVEDIR) { |
| clear_nlink(inode); |
| v9fs_dec_count(dir); |
| } else |
| v9fs_dec_count(inode); |
| |
| v9fs_invalidate_inode_attr(inode); |
| v9fs_invalidate_inode_attr(dir); |
| } |
| return retval; |
| } |
| |
| /** |
| * v9fs_create - Create a file |
| * @v9ses: session information |
| * @dir: directory that dentry is being created in |
| * @dentry: dentry that is being created |
| * @extension: 9p2000.u extension string to support devices, etc. |
| * @perm: create permissions |
| * @mode: open mode |
| * |
| */ |
| static struct p9_fid * |
| v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, |
| struct dentry *dentry, char *extension, u32 perm, u8 mode) |
| { |
| int err; |
| const unsigned char *name; |
| struct p9_fid *dfid, *ofid, *fid; |
| struct inode *inode; |
| |
| p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); |
| |
| err = 0; |
| ofid = NULL; |
| fid = NULL; |
| name = dentry->d_name.name; |
| dfid = v9fs_parent_fid(dentry); |
| if (IS_ERR(dfid)) { |
| err = PTR_ERR(dfid); |
| p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| return ERR_PTR(err); |
| } |
| |
| /* clone a fid to use for creation */ |
| ofid = clone_fid(dfid); |
| if (IS_ERR(ofid)) { |
| err = PTR_ERR(ofid); |
| p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
| return ERR_PTR(err); |
| } |
| |
| err = p9_client_fcreate(ofid, name, perm, mode, extension); |
| if (err < 0) { |
| p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); |
| goto error; |
| } |
| |
| if (!(perm & P9_DMLINK)) { |
| /* now walk from the parent so we can get unopened fid */ |
| fid = p9_client_walk(dfid, 1, &name, 1); |
| if (IS_ERR(fid)) { |
| err = PTR_ERR(fid); |
| p9_debug(P9_DEBUG_VFS, |
| "p9_client_walk failed %d\n", err); |
| fid = NULL; |
| goto error; |
| } |
| /* |
| * instantiate inode and assign the unopened fid to the dentry |
| */ |
| inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); |
| if (IS_ERR(inode)) { |
| err = PTR_ERR(inode); |
| p9_debug(P9_DEBUG_VFS, |
| "inode creation failed %d\n", err); |
| goto error; |
| } |
| v9fs_fid_add(dentry, fid); |
| d_instantiate(dentry, inode); |
| } |
| return ofid; |
| error: |
| if (ofid) |
| p9_client_clunk(ofid); |
| |
| if (fid) |
| p9_client_clunk(fid); |
| |
| return ERR_PTR(err); |
| } |
| |
| /** |
| * v9fs_vfs_create - VFS hook to create a regular file |
| * |
| * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called |
| * for mknod(2). |
| * |
| * @dir: directory inode that is being created |
| * @dentry: dentry that is being deleted |
| * @mode: create permissions |
| * |
| */ |
| |
| static int |
| v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
| bool excl) |
| { |
| struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); |
| u32 perm = unixmode2p9mode(v9ses, mode); |
| struct p9_fid *fid; |
| |
| /* P9_OEXCL? */ |
| fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); |
| if (IS_ERR(fid)) |
| return PTR_ERR(fid); |
| |
| v9fs_invalidate_inode_attr(dir); |
| p9_client_clunk(fid); |
| |
| return 0; |
| } |
| |
| /** |
| * v9fs_vfs_mkdir - 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(struct inode *dir, struct dentry *dentry, umode_t mode) |
| { |
| int err; |
| u32 perm; |
| struct p9_fid *fid; |
| struct v9fs_session_info *v9ses; |
| |
| p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); |
| err = 0; |
| v9ses = v9fs_inode2v9ses(dir); |
| perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
| fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
| if (IS_ERR(fid)) { |
| err = PTR_ERR(fid); |
| fid = NULL; |
| } else { |
| inc_nlink(dir); |
| v9fs_invalidate_inode_attr(dir); |
| } |
| |
| if (fid) |
| p9_client_clunk(fid); |
| |
| return err; |
| } |
| |
| /** |
| * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode |
| * @dir: inode that is being walked from |
| * @dentry: dentry that is being walked to? |
| * @flags: lookup flags (unused) |
| * |
| */ |
| |
| struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, |
| unsigned int flags) |
| { |
| struct dentry *res; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *dfid, *fid; |
| struct inode *inode; |
| const unsigned char *name; |
| |
| p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", |
| dir, dentry, dentry, flags); |
| |
| if (dentry->d_name.len > NAME_MAX) |
| return ERR_PTR(-ENAMETOOLONG); |
| |
| v9ses = v9fs_inode2v9ses(dir); |
| /* We can walk d_parent because we hold the dir->i_mutex */ |
| dfid = v9fs_parent_fid(dentry); |
| if (IS_ERR(dfid)) |
| return ERR_CAST(dfid); |
| |
| /* |
| * Make sure we don't use a wrong inode due to parallel |
| * unlink. For cached mode create calls request for new |
| * inode. But with cache disabled, lookup should do this. |
| */ |
| name = dentry->d_name.name; |
| fid = p9_client_walk(dfid, 1, &name, 1); |
| if (fid == ERR_PTR(-ENOENT)) |
| inode = NULL; |
| else if (IS_ERR(fid)) |
| inode = ERR_CAST(fid); |
| else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
| inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); |
| else |
| inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); |
| /* |
| * If we had a rename on the server and a parallel lookup |
| * for the new name, then make sure we instantiate with |
| * the new name. ie look up for a/b, while on server somebody |
| * moved b under k and client parallely did a lookup for |
| * k/b. |
| */ |
| res = d_splice_alias(inode, dentry); |
| if (!IS_ERR(fid)) { |
| if (!res) |
| v9fs_fid_add(dentry, fid); |
| else if (!IS_ERR(res)) |
| v9fs_fid_add(res, fid); |
| else |
| p9_client_clunk(fid); |
| } |
| return res; |
| } |
| |
| static int |
| v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, |
| struct file *file, unsigned flags, umode_t mode, |
| int *opened) |
| { |
| int err; |
| u32 perm; |
| struct v9fs_inode *v9inode; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid, *inode_fid; |
| struct dentry *res = NULL; |
| |
| if (d_in_lookup(dentry)) { |
| res = v9fs_vfs_lookup(dir, dentry, 0); |
| if (IS_ERR(res)) |
| return PTR_ERR(res); |
| |
| if (res) |
| dentry = res; |
| } |
| |
| /* Only creates */ |
| if (!(flags & O_CREAT) || d_really_is_positive(dentry)) |
| return finish_no_open(file, res); |
| |
| err = 0; |
| |
| v9ses = v9fs_inode2v9ses(dir); |
| perm = unixmode2p9mode(v9ses, mode); |
| fid = v9fs_create(v9ses, dir, dentry, NULL, perm, |
| v9fs_uflags2omode(flags, |
| v9fs_proto_dotu(v9ses))); |
| if (IS_ERR(fid)) { |
| err = PTR_ERR(fid); |
| fid = NULL; |
| goto error; |
| } |
| |
| v9fs_invalidate_inode_attr(dir); |
| v9inode = V9FS_I(d_inode(dentry)); |
| mutex_lock(&v9inode->v_mutex); |
| if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && |
| !v9inode->writeback_fid && |
| ((flags & O_ACCMODE) != O_RDONLY)) { |
| /* |
| * clone a fid and add it to writeback_fid |
| * we do it during open time instead of |
| * page dirty time via write_begin/page_mkwrite |
| * because we want write after unlink usecase |
| * to work. |
| */ |
| inode_fid = v9fs_writeback_fid(dentry); |
| if (IS_ERR(inode_fid)) { |
| err = PTR_ERR(inode_fid); |
| mutex_unlock(&v9inode->v_mutex); |
| goto error; |
| } |
| v9inode->writeback_fid = (void *) inode_fid; |
| } |
| mutex_unlock(&v9inode->v_mutex); |
| err = finish_open(file, dentry, generic_file_open); |
| if (err) |
| goto error; |
| |
| file->private_data = fid; |
| if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
| v9fs_cache_inode_set_cookie(d_inode(dentry), file); |
| |
| file->f_mode |= FMODE_CREATED; |
| out: |
| dput(res); |
| return err; |
| |
| error: |
| if (fid) |
| p9_client_clunk(fid); |
| goto out; |
| } |
| |
| /** |
| * v9fs_vfs_unlink - VFS unlink hook to delete an inode |
| * @i: inode that is being unlinked |
| * @d: dentry that is being unlinked |
| * |
| */ |
| |
| int v9fs_vfs_unlink(struct inode *i, struct dentry *d) |
| { |
| return v9fs_remove(i, d, 0); |
| } |
| |
| /** |
| * v9fs_vfs_rmdir - VFS unlink hook to delete a directory |
| * @i: inode that is being unlinked |
| * @d: dentry that is being unlinked |
| * |
| */ |
| |
| int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) |
| { |
| return v9fs_remove(i, d, AT_REMOVEDIR); |
| } |
| |
| /** |
| * v9fs_vfs_rename - VFS hook to rename an inode |
| * @old_dir: old dir inode |
| * @old_dentry: old dentry |
| * @new_dir: new dir inode |
| * @new_dentry: new dentry |
| * |
| */ |
| |
| int |
| v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| struct inode *new_dir, struct dentry *new_dentry, |
| unsigned int flags) |
| { |
| int retval; |
| struct inode *old_inode; |
| struct inode *new_inode; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *oldfid; |
| struct p9_fid *olddirfid; |
| struct p9_fid *newdirfid; |
| struct p9_wstat wstat; |
| |
| if (flags) |
| return -EINVAL; |
| |
| p9_debug(P9_DEBUG_VFS, "\n"); |
| retval = 0; |
| old_inode = d_inode(old_dentry); |
| new_inode = d_inode(new_dentry); |
| v9ses = v9fs_inode2v9ses(old_inode); |
| oldfid = v9fs_fid_lookup(old_dentry); |
| if (IS_ERR(oldfid)) |
| return PTR_ERR(oldfid); |
| |
| olddirfid = clone_fid(v9fs_parent_fid(old_dentry)); |
| if (IS_ERR(olddirfid)) { |
| retval = PTR_ERR(olddirfid); |
| goto done; |
| } |
| |
| newdirfid = clone_fid(v9fs_parent_fid(new_dentry)); |
| if (IS_ERR(newdirfid)) { |
| retval = PTR_ERR(newdirfid); |
| goto clunk_olddir; |
| } |
| |
| down_write(&v9ses->rename_sem); |
| if (v9fs_proto_dotl(v9ses)) { |
| retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, |
| newdirfid, new_dentry->d_name.name); |
| if (retval == -EOPNOTSUPP) |
| retval = p9_client_rename(oldfid, newdirfid, |
| new_dentry->d_name.name); |
| if (retval != -EOPNOTSUPP) |
| goto clunk_newdir; |
| } |
| if (old_dentry->d_parent != new_dentry->d_parent) { |
| /* |
| * 9P .u can only handle file rename in the same directory |
| */ |
| |
| p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); |
| retval = -EXDEV; |
| goto clunk_newdir; |
| } |
| v9fs_blank_wstat(&wstat); |
| wstat.muid = v9ses->uname; |
| wstat.name = new_dentry->d_name.name; |
| retval = p9_client_wstat(oldfid, &wstat); |
| |
| clunk_newdir: |
| if (!retval) { |
| if (new_inode) { |
| if (S_ISDIR(new_inode->i_mode)) |
| clear_nlink(new_inode); |
| else |
| v9fs_dec_count(new_inode); |
| } |
| if (S_ISDIR(old_inode->i_mode)) { |
| if (!new_inode) |
| inc_nlink(new_dir); |
| v9fs_dec_count(old_dir); |
| } |
| v9fs_invalidate_inode_attr(old_inode); |
| v9fs_invalidate_inode_attr(old_dir); |
| v9fs_invalidate_inode_attr(new_dir); |
| |
| /* successful rename */ |
| d_move(old_dentry, new_dentry); |
| } |
| up_write(&v9ses->rename_sem); |
| p9_client_clunk(newdirfid); |
| |
| clunk_olddir: |
| p9_client_clunk(olddirfid); |
| |
| done: |
| return retval; |
| } |
| |
| /** |
| * v9fs_vfs_getattr - retrieve file metadata |
| * @path: Object to query |
| * @stat: metadata structure to populate |
| * @request_mask: Mask of STATX_xxx flags indicating the caller's interests |
| * @flags: AT_STATX_xxx setting |
| * |
| */ |
| |
| static int |
| v9fs_vfs_getattr(const struct path *path, struct kstat *stat, |
| u32 request_mask, unsigned int flags) |
| { |
| struct dentry *dentry = path->dentry; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid; |
| struct p9_wstat *st; |
| |
| p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); |
| v9ses = v9fs_dentry2v9ses(dentry); |
| if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { |
| generic_fillattr(d_inode(dentry), stat); |
| return 0; |
| } |
| fid = v9fs_fid_lookup(dentry); |
| if (IS_ERR(fid)) |
| return PTR_ERR(fid); |
| |
| st = p9_client_stat(fid); |
| if (IS_ERR(st)) |
| return PTR_ERR(st); |
| |
| v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb); |
| generic_fillattr(d_inode(dentry), stat); |
| |
| p9stat_free(st); |
| kfree(st); |
| return 0; |
| } |
| |
| /** |
| * v9fs_vfs_setattr - set file metadata |
| * @dentry: file whose metadata to set |
| * @iattr: metadata assignment structure |
| * |
| */ |
| |
| static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) |
| { |
| int retval; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid; |
| struct p9_wstat wstat; |
| |
| p9_debug(P9_DEBUG_VFS, "\n"); |
| retval = setattr_prepare(dentry, iattr); |
| if (retval) |
| return retval; |
| |
| retval = -EPERM; |
| v9ses = v9fs_dentry2v9ses(dentry); |
| fid = v9fs_fid_lookup(dentry); |
| if(IS_ERR(fid)) |
| return PTR_ERR(fid); |
| |
| v9fs_blank_wstat(&wstat); |
| if (iattr->ia_valid & ATTR_MODE) |
| wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
| |
| if (iattr->ia_valid & ATTR_MTIME) |
| wstat.mtime = iattr->ia_mtime.tv_sec; |
| |
| if (iattr->ia_valid & ATTR_ATIME) |
| wstat.atime = iattr->ia_atime.tv_sec; |
| |
| if (iattr->ia_valid & ATTR_SIZE) |
| wstat.length = iattr->ia_size; |
| |
| if (v9fs_proto_dotu(v9ses)) { |
| if (iattr->ia_valid & ATTR_UID) |
| wstat.n_uid = iattr->ia_uid; |
| |
| if (iattr->ia_valid & ATTR_GID) |
| wstat.n_gid = iattr->ia_gid; |
| } |
| |
| /* Write all dirty data */ |
| if (d_is_reg(dentry)) |
| filemap_write_and_wait(d_inode(dentry)->i_mapping); |
| |
| retval = p9_client_wstat(fid, &wstat); |
| if (retval < 0) |
| return retval; |
| |
| if ((iattr->ia_valid & ATTR_SIZE) && |
| iattr->ia_size != i_size_read(d_inode(dentry))) |
| truncate_setsize(d_inode(dentry), iattr->ia_size); |
| |
| v9fs_invalidate_inode_attr(d_inode(dentry)); |
| |
| setattr_copy(d_inode(dentry), iattr); |
| mark_inode_dirty(d_inode(dentry)); |
| return 0; |
| } |
| |
| /** |
| * v9fs_stat2inode - populate an inode structure with mistat info |
| * @stat: Plan 9 metadata (mistat) structure |
| * @inode: inode to populate |
| * @sb: superblock of filesystem |
| * |
| */ |
| |
| void |
| v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
| struct super_block *sb) |
| { |
| umode_t mode; |
| char ext[32]; |
| char tag_name[14]; |
| unsigned int i_nlink; |
| struct v9fs_session_info *v9ses = sb->s_fs_info; |
| struct v9fs_inode *v9inode = V9FS_I(inode); |
| |
| set_nlink(inode, 1); |
| |
| inode->i_atime.tv_sec = stat->atime; |
| inode->i_mtime.tv_sec = stat->mtime; |
| inode->i_ctime.tv_sec = stat->mtime; |
| |
| inode->i_uid = v9ses->dfltuid; |
| inode->i_gid = v9ses->dfltgid; |
| |
| if (v9fs_proto_dotu(v9ses)) { |
| inode->i_uid = stat->n_uid; |
| inode->i_gid = stat->n_gid; |
| } |
| if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { |
| if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { |
| /* |
| * Hadlink support got added later to |
| * to the .u extension. So there can be |
| * server out there that doesn't support |
| * this even with .u extension. So check |
| * for non NULL stat->extension |
| */ |
| strlcpy(ext, stat->extension, sizeof(ext)); |
| /* HARDLINKCOUNT %u */ |
| sscanf(ext, "%13s %u", tag_name, &i_nlink); |
| if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) |
| set_nlink(inode, i_nlink); |
| } |
| } |
| mode = p9mode2perm(v9ses, stat); |
| mode |= inode->i_mode & ~S_IALLUGO; |
| inode->i_mode = mode; |
| i_size_write(inode, stat->length); |
| |
| /* not real number of blocks, but 512 byte ones ... */ |
| inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; |
| v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; |
| } |
| |
| /** |
| * v9fs_qid2ino - convert qid into inode number |
| * @qid: qid to hash |
| * |
| * BUG: potential for inode number collisions? |
| */ |
| |
| ino_t v9fs_qid2ino(struct p9_qid *qid) |
| { |
| u64 path = qid->path + 2; |
| ino_t i = 0; |
| |
| if (sizeof(ino_t) == sizeof(path)) |
| memcpy(&i, &path, sizeof(ino_t)); |
| else |
| i = (ino_t) (path ^ (path >> 32)); |
| |
| return i; |
| } |
| |
| /** |
| * v9fs_vfs_get_link - follow a symlink path |
| * @dentry: dentry for symlink |
| * @inode: inode for symlink |
| * @done: delayed call for when we are done with the return value |
| */ |
| |
| static const char *v9fs_vfs_get_link(struct dentry *dentry, |
| struct inode *inode, |
| struct delayed_call *done) |
| { |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid; |
| struct p9_wstat *st; |
| char *res; |
| |
| if (!dentry) |
| return ERR_PTR(-ECHILD); |
| |
| v9ses = v9fs_dentry2v9ses(dentry); |
| fid = v9fs_fid_lookup(dentry); |
| p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); |
| |
| if (IS_ERR(fid)) |
| return ERR_CAST(fid); |
| |
| if (!v9fs_proto_dotu(v9ses)) |
| return ERR_PTR(-EBADF); |
| |
| st = p9_client_stat(fid); |
| if (IS_ERR(st)) |
| return ERR_CAST(st); |
| |
| if (!(st->mode & P9_DMSYMLINK)) { |
| p9stat_free(st); |
| kfree(st); |
| return ERR_PTR(-EINVAL); |
| } |
| res = st->extension; |
| st->extension = NULL; |
| if (strlen(res) >= PATH_MAX) |
| res[PATH_MAX - 1] = '\0'; |
| |
| p9stat_free(st); |
| kfree(st); |
| set_delayed_call(done, kfree_link, res); |
| return res; |
| } |
| |
| /** |
| * v9fs_vfs_mkspecial - create a special file |
| * @dir: inode to create special file in |
| * @dentry: dentry to create |
| * @perm: mode to create special file |
| * @extension: 9p2000.u format extension string representing special file |
| * |
| */ |
| |
| static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
| u32 perm, const char *extension) |
| { |
| struct p9_fid *fid; |
| struct v9fs_session_info *v9ses; |
| |
| v9ses = v9fs_inode2v9ses(dir); |
| if (!v9fs_proto_dotu(v9ses)) { |
| p9_debug(P9_DEBUG_ERROR, "not extended\n"); |
| return -EPERM; |
| } |
| |
| fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
| P9_OREAD); |
| if (IS_ERR(fid)) |
| return PTR_ERR(fid); |
| |
| v9fs_invalidate_inode_attr(dir); |
| p9_client_clunk(fid); |
| return 0; |
| } |
| |
| /** |
| * v9fs_vfs_symlink - helper function to create symlinks |
| * @dir: directory inode containing symlink |
| * @dentry: dentry for symlink |
| * @symname: symlink data |
| * |
| * See Also: 9P2000.u RFC for more information |
| * |
| */ |
| |
| static int |
| v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
| { |
| p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", |
| dir->i_ino, dentry, symname); |
| |
| return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); |
| } |
| |
| #define U32_MAX_DIGITS 10 |
| |
| /** |
| * v9fs_vfs_link - create a hardlink |
| * @old_dentry: dentry for file to link to |
| * @dir: inode destination for new link |
| * @dentry: dentry for link |
| * |
| */ |
| |
| static int |
| v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, |
| struct dentry *dentry) |
| { |
| int retval; |
| char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ |
| struct p9_fid *oldfid; |
| |
| p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", |
| dir->i_ino, dentry, old_dentry); |
| |
| oldfid = v9fs_fid_clone(old_dentry); |
| if (IS_ERR(oldfid)) |
| return PTR_ERR(oldfid); |
| |
| sprintf(name, "%d\n", oldfid->fid); |
| retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
| if (!retval) { |
| v9fs_refresh_inode(oldfid, d_inode(old_dentry)); |
| v9fs_invalidate_inode_attr(dir); |
| } |
| p9_client_clunk(oldfid); |
| return retval; |
| } |
| |
| /** |
| * v9fs_vfs_mknod - 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(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
| { |
| struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); |
| int retval; |
| char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; |
| u32 perm; |
| |
| p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", |
| dir->i_ino, dentry, mode, |
| MAJOR(rdev), MINOR(rdev)); |
| |
| /* build extension */ |
| if (S_ISBLK(mode)) |
| sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
| else if (S_ISCHR(mode)) |
| sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
| else |
| *name = 0; |
| |
| perm = unixmode2p9mode(v9ses, mode); |
| retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); |
| |
| return retval; |
| } |
| |
| int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) |
| { |
| int umode; |
| dev_t rdev; |
| loff_t i_size; |
| struct p9_wstat *st; |
| struct v9fs_session_info *v9ses; |
| |
| v9ses = v9fs_inode2v9ses(inode); |
| st = p9_client_stat(fid); |
| if (IS_ERR(st)) |
| return PTR_ERR(st); |
| /* |
| * Don't update inode if the file type is different |
| */ |
| umode = p9mode2unixmode(v9ses, st, &rdev); |
| if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) |
| goto out; |
| |
| spin_lock(&inode->i_lock); |
| /* |
| * We don't want to refresh inode->i_size, |
| * because we may have cached data |
| */ |
| i_size = inode->i_size; |
| v9fs_stat2inode(st, inode, inode->i_sb); |
| if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
| inode->i_size = i_size; |
| spin_unlock(&inode->i_lock); |
| out: |
| p9stat_free(st); |
| kfree(st); |
| return 0; |
| } |
| |
| static const struct inode_operations v9fs_dir_inode_operations_dotu = { |
| .create = v9fs_vfs_create, |
| .lookup = v9fs_vfs_lookup, |
| .atomic_open = v9fs_vfs_atomic_open, |
| .symlink = v9fs_vfs_symlink, |
| .link = v9fs_vfs_link, |
| .unlink = v9fs_vfs_unlink, |
| .mkdir = v9fs_vfs_mkdir, |
| .rmdir = v9fs_vfs_rmdir, |
| .mknod = v9fs_vfs_mknod, |
| .rename = v9fs_vfs_rename, |
| .getattr = v9fs_vfs_getattr, |
| .setattr = v9fs_vfs_setattr, |
| }; |
| |
| static const struct inode_operations v9fs_dir_inode_operations = { |
| .create = v9fs_vfs_create, |
| .lookup = v9fs_vfs_lookup, |
| .atomic_open = v9fs_vfs_atomic_open, |
| .unlink = v9fs_vfs_unlink, |
| .mkdir = v9fs_vfs_mkdir, |
| .rmdir = v9fs_vfs_rmdir, |
| .mknod = v9fs_vfs_mknod, |
| .rename = v9fs_vfs_rename, |
| .getattr = v9fs_vfs_getattr, |
| .setattr = v9fs_vfs_setattr, |
| }; |
| |
| static const struct inode_operations v9fs_file_inode_operations = { |
| .getattr = v9fs_vfs_getattr, |
| .setattr = v9fs_vfs_setattr, |
| }; |
| |
| static const struct inode_operations v9fs_symlink_inode_operations = { |
| .get_link = v9fs_vfs_get_link, |
| .getattr = v9fs_vfs_getattr, |
| .setattr = v9fs_vfs_setattr, |
| }; |
| |