| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * This file contains vfs inode ops for the 9P2000.L protocol. |
| * |
| * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
| * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
| */ |
| |
| #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/namei.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 int |
| v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir, |
| struct dentry *dentry, umode_t omode, dev_t rdev); |
| |
| /** |
| * v9fs_get_fsgid_for_create - Helper function to get the gid for a new object |
| * @dir_inode: The directory inode |
| * |
| * 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 kgid_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(); |
| } |
| |
| static int v9fs_test_inode_dotl(struct inode *inode, void *data) |
| { |
| struct v9fs_inode *v9inode = V9FS_I(inode); |
| struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; |
| |
| /* don't match inode of different type */ |
| if (inode_wrong_type(inode, st->st_mode)) |
| return 0; |
| |
| if (inode->i_generation != st->st_gen) |
| 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; |
| } |
| |
| /* Always get a new inode */ |
| static int v9fs_test_new_inode_dotl(struct inode *inode, void *data) |
| { |
| return 0; |
| } |
| |
| static int v9fs_set_inode_dotl(struct inode *inode, void *data) |
| { |
| struct v9fs_inode *v9inode = V9FS_I(inode); |
| struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; |
| |
| memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); |
| inode->i_generation = st->st_gen; |
| return 0; |
| } |
| |
| static struct inode *v9fs_qid_iget_dotl(struct super_block *sb, |
| struct p9_qid *qid, |
| struct p9_fid *fid, |
| struct p9_stat_dotl *st, |
| int new) |
| { |
| int retval; |
| unsigned long i_ino; |
| struct inode *inode; |
| struct v9fs_session_info *v9ses = sb->s_fs_info; |
| int (*test)(struct inode *inode, void *data); |
| |
| if (new) |
| test = v9fs_test_new_inode_dotl; |
| else |
| test = v9fs_test_inode_dotl; |
| |
| i_ino = v9fs_qid2ino(qid); |
| inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, 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; |
| retval = v9fs_init_inode(v9ses, inode, |
| st->st_mode, new_decode_dev(st->st_rdev)); |
| if (retval) |
| goto error; |
| |
| v9fs_stat2inode_dotl(st, inode, 0); |
| v9fs_cache_inode_get_cookie(inode); |
| retval = v9fs_get_acl(inode, fid); |
| if (retval) |
| goto error; |
| |
| unlock_new_inode(inode); |
| return inode; |
| error: |
| iget_failed(inode); |
| return ERR_PTR(retval); |
| |
| } |
| |
| struct inode * |
| v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
| struct super_block *sb, int new) |
| { |
| struct p9_stat_dotl *st; |
| struct inode *inode = NULL; |
| |
| st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN); |
| if (IS_ERR(st)) |
| return ERR_CAST(st); |
| |
| inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new); |
| kfree(st); |
| return inode; |
| } |
| |
| struct dotl_openflag_map { |
| int open_flag; |
| int dotl_flag; |
| }; |
| |
| static int v9fs_mapped_dotl_flags(int flags) |
| { |
| int i; |
| int rflags = 0; |
| struct dotl_openflag_map dotl_oflag_map[] = { |
| { O_CREAT, P9_DOTL_CREATE }, |
| { O_EXCL, P9_DOTL_EXCL }, |
| { O_NOCTTY, P9_DOTL_NOCTTY }, |
| { O_APPEND, P9_DOTL_APPEND }, |
| { O_NONBLOCK, P9_DOTL_NONBLOCK }, |
| { O_DSYNC, P9_DOTL_DSYNC }, |
| { FASYNC, P9_DOTL_FASYNC }, |
| { O_DIRECT, P9_DOTL_DIRECT }, |
| { O_LARGEFILE, P9_DOTL_LARGEFILE }, |
| { O_DIRECTORY, P9_DOTL_DIRECTORY }, |
| { O_NOFOLLOW, P9_DOTL_NOFOLLOW }, |
| { O_NOATIME, P9_DOTL_NOATIME }, |
| { O_CLOEXEC, P9_DOTL_CLOEXEC }, |
| { O_SYNC, P9_DOTL_SYNC}, |
| }; |
| for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { |
| if (flags & dotl_oflag_map[i].open_flag) |
| rflags |= dotl_oflag_map[i].dotl_flag; |
| } |
| return rflags; |
| } |
| |
| /** |
| * v9fs_open_to_dotl_flags- convert Linux specific open flags to |
| * plan 9 open flag. |
| * @flags: flags to convert |
| */ |
| int v9fs_open_to_dotl_flags(int flags) |
| { |
| int rflags = 0; |
| |
| /* |
| * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY |
| * and P9_DOTL_NOACCESS |
| */ |
| rflags |= flags & O_ACCMODE; |
| rflags |= v9fs_mapped_dotl_flags(flags); |
| |
| return rflags; |
| } |
| |
| /** |
| * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. |
| * @idmap: The user namespace of the mount |
| * @dir: directory inode that is being created |
| * @dentry: dentry that is being deleted |
| * @omode: create permissions |
| * @excl: True if the file must not yet exist |
| * |
| */ |
| static int |
| v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir, |
| struct dentry *dentry, umode_t omode, bool excl) |
| { |
| return v9fs_vfs_mknod_dotl(idmap, dir, dentry, omode, 0); |
| } |
| |
| static int |
| v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, |
| struct file *file, unsigned int flags, umode_t omode) |
| { |
| int err = 0; |
| kgid_t gid; |
| umode_t mode; |
| int p9_omode = v9fs_open_to_dotl_flags(flags); |
| const unsigned char *name = NULL; |
| struct p9_qid qid; |
| struct inode *inode; |
| struct p9_fid *fid = NULL; |
| struct p9_fid *dfid = NULL, *ofid = NULL; |
| struct v9fs_session_info *v9ses; |
| struct posix_acl *pacl = NULL, *dacl = NULL; |
| 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); |
| |
| v9ses = v9fs_inode2v9ses(dir); |
| |
| name = dentry->d_name.name; |
| p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n", |
| name, flags, omode); |
| |
| dfid = v9fs_parent_fid(dentry); |
| if (IS_ERR(dfid)) { |
| err = PTR_ERR(dfid); |
| p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| goto out; |
| } |
| |
| /* 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); |
| goto out; |
| } |
| |
| 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_debug(P9_DEBUG_VFS, "Failed to get acl values in create %d\n", |
| err); |
| goto out; |
| } |
| |
| if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) { |
| p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR; |
| p9_debug(P9_DEBUG_CACHE, |
| "write-only file with writeback enabled, creating w/ O_RDWR\n"); |
| } |
| err = p9_client_create_dotl(ofid, name, p9_omode, mode, gid, &qid); |
| if (err < 0) { |
| p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n", |
| err); |
| goto out; |
| } |
| v9fs_invalidate_inode_attr(dir); |
| |
| /* 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_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
| goto out; |
| } |
| 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 out; |
| } |
| /* Now set the ACL based on the default value */ |
| v9fs_set_create_acl(inode, fid, dacl, pacl); |
| |
| v9fs_fid_add(dentry, &fid); |
| d_instantiate(dentry, inode); |
| |
| /* Since we are opening a file, assign the open fid to the file */ |
| err = finish_open(file, dentry, generic_file_open); |
| if (err) |
| goto out; |
| file->private_data = ofid; |
| #ifdef CONFIG_9P_FSCACHE |
| if (v9ses->cache & CACHE_FSCACHE) { |
| struct v9fs_inode *v9inode = V9FS_I(inode); |
| fscache_use_cookie(v9fs_inode_cookie(v9inode), |
| file->f_mode & FMODE_WRITE); |
| } |
| #endif |
| v9fs_fid_add_modes(ofid, v9ses->flags, v9ses->cache, flags); |
| v9fs_open_fid_add(inode, &ofid); |
| file->f_mode |= FMODE_CREATED; |
| out: |
| p9_fid_put(dfid); |
| p9_fid_put(ofid); |
| p9_fid_put(fid); |
| v9fs_put_acl(dacl, pacl); |
| dput(res); |
| return err; |
| } |
| |
| /** |
| * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory |
| * @idmap: The idmap of the mount |
| * @dir: inode that is being unlinked |
| * @dentry: dentry that is being unlinked |
| * @omode: mode for new directory |
| * |
| */ |
| |
| static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap, |
| struct inode *dir, struct dentry *dentry, |
| umode_t omode) |
| { |
| int err; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid = NULL, *dfid = NULL; |
| kgid_t gid; |
| const unsigned char *name; |
| umode_t mode; |
| struct inode *inode; |
| struct p9_qid qid; |
| struct posix_acl *dacl = NULL, *pacl = NULL; |
| |
| p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); |
| v9ses = v9fs_inode2v9ses(dir); |
| |
| omode |= S_IFDIR; |
| if (dir->i_mode & S_ISGID) |
| omode |= S_ISGID; |
| |
| dfid = v9fs_parent_fid(dentry); |
| if (IS_ERR(dfid)) { |
| err = PTR_ERR(dfid); |
| p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| 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_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", |
| err); |
| goto error; |
| } |
| name = dentry->d_name.name; |
| err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); |
| if (err < 0) |
| goto error; |
| 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); |
| goto error; |
| } |
| |
| /* instantiate inode and assign the unopened fid to the dentry */ |
| if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { |
| 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); |
| v9fs_set_create_acl(inode, fid, dacl, pacl); |
| d_instantiate(dentry, inode); |
| err = 0; |
| } 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, 0); |
| if (IS_ERR(inode)) { |
| err = PTR_ERR(inode); |
| goto error; |
| } |
| v9fs_set_create_acl(inode, fid, dacl, pacl); |
| d_instantiate(dentry, inode); |
| } |
| inc_nlink(dir); |
| v9fs_invalidate_inode_attr(dir); |
| error: |
| p9_fid_put(fid); |
| v9fs_put_acl(dacl, pacl); |
| p9_fid_put(dfid); |
| return err; |
| } |
| |
| static int |
| v9fs_vfs_getattr_dotl(struct mnt_idmap *idmap, |
| 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 inode *inode = d_inode(dentry); |
| struct p9_stat_dotl *st; |
| |
| p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); |
| v9ses = v9fs_dentry2v9ses(dentry); |
| if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { |
| generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); |
| return 0; |
| } else if (v9ses->cache) { |
| if (S_ISREG(inode->i_mode)) { |
| int retval = filemap_fdatawrite(inode->i_mapping); |
| |
| if (retval) |
| p9_debug(P9_DEBUG_ERROR, |
| "flushing writeback during getattr returned %d\n", retval); |
| } |
| } |
| 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); |
| p9_fid_put(fid); |
| if (IS_ERR(st)) |
| return PTR_ERR(st); |
| |
| v9fs_stat2inode_dotl(st, d_inode(dentry), 0); |
| generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat); |
| /* Change block size to what the server returned */ |
| stat->blksize = st->st_blksize; |
| |
| kfree(st); |
| return 0; |
| } |
| |
| /* |
| * Attribute flags. |
| */ |
| #define P9_ATTR_MODE (1 << 0) |
| #define P9_ATTR_UID (1 << 1) |
| #define P9_ATTR_GID (1 << 2) |
| #define P9_ATTR_SIZE (1 << 3) |
| #define P9_ATTR_ATIME (1 << 4) |
| #define P9_ATTR_MTIME (1 << 5) |
| #define P9_ATTR_CTIME (1 << 6) |
| #define P9_ATTR_ATIME_SET (1 << 7) |
| #define P9_ATTR_MTIME_SET (1 << 8) |
| |
| struct dotl_iattr_map { |
| int iattr_valid; |
| int p9_iattr_valid; |
| }; |
| |
| static int v9fs_mapped_iattr_valid(int iattr_valid) |
| { |
| int i; |
| int p9_iattr_valid = 0; |
| struct dotl_iattr_map dotl_iattr_map[] = { |
| { ATTR_MODE, P9_ATTR_MODE }, |
| { ATTR_UID, P9_ATTR_UID }, |
| { ATTR_GID, P9_ATTR_GID }, |
| { ATTR_SIZE, P9_ATTR_SIZE }, |
| { ATTR_ATIME, P9_ATTR_ATIME }, |
| { ATTR_MTIME, P9_ATTR_MTIME }, |
| { ATTR_CTIME, P9_ATTR_CTIME }, |
| { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, |
| { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, |
| }; |
| for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { |
| if (iattr_valid & dotl_iattr_map[i].iattr_valid) |
| p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; |
| } |
| return p9_iattr_valid; |
| } |
| |
| /** |
| * v9fs_vfs_setattr_dotl - set file metadata |
| * @idmap: idmap of the mount |
| * @dentry: file whose metadata to set |
| * @iattr: metadata assignment structure |
| * |
| */ |
| |
| int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap, |
| struct dentry *dentry, struct iattr *iattr) |
| { |
| int retval, use_dentry = 0; |
| struct inode *inode = d_inode(dentry); |
| struct v9fs_session_info __maybe_unused *v9ses; |
| struct p9_fid *fid = NULL; |
| struct p9_iattr_dotl p9attr = { |
| .uid = INVALID_UID, |
| .gid = INVALID_GID, |
| }; |
| |
| p9_debug(P9_DEBUG_VFS, "\n"); |
| |
| retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr); |
| if (retval) |
| return retval; |
| |
| v9ses = v9fs_dentry2v9ses(dentry); |
| |
| p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); |
| if (iattr->ia_valid & ATTR_MODE) |
| p9attr.mode = iattr->ia_mode; |
| if (iattr->ia_valid & ATTR_UID) |
| p9attr.uid = iattr->ia_uid; |
| if (iattr->ia_valid & ATTR_GID) |
| p9attr.gid = iattr->ia_gid; |
| if (iattr->ia_valid & ATTR_SIZE) |
| p9attr.size = iattr->ia_size; |
| if (iattr->ia_valid & ATTR_ATIME_SET) { |
| p9attr.atime_sec = iattr->ia_atime.tv_sec; |
| p9attr.atime_nsec = iattr->ia_atime.tv_nsec; |
| } |
| if (iattr->ia_valid & ATTR_MTIME_SET) { |
| p9attr.mtime_sec = iattr->ia_mtime.tv_sec; |
| p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; |
| } |
| |
| if (iattr->ia_valid & ATTR_FILE) { |
| fid = iattr->ia_file->private_data; |
| WARN_ON(!fid); |
| } |
| if (!fid) { |
| fid = v9fs_fid_lookup(dentry); |
| use_dentry = 1; |
| } |
| if (IS_ERR(fid)) |
| return PTR_ERR(fid); |
| |
| /* Write all dirty data */ |
| if (S_ISREG(inode->i_mode)) { |
| retval = filemap_fdatawrite(inode->i_mapping); |
| if (retval < 0) |
| p9_debug(P9_DEBUG_ERROR, |
| "Flushing file prior to setattr failed: %d\n", retval); |
| } |
| |
| retval = p9_client_setattr(fid, &p9attr); |
| if (retval < 0) { |
| if (use_dentry) |
| p9_fid_put(fid); |
| return retval; |
| } |
| |
| if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size != |
| i_size_read(inode)) { |
| truncate_setsize(inode, iattr->ia_size); |
| truncate_pagecache(inode, iattr->ia_size); |
| |
| #ifdef CONFIG_9P_FSCACHE |
| if (v9ses->cache & CACHE_FSCACHE) |
| fscache_resize_cookie(v9fs_inode_cookie(V9FS_I(inode)), |
| iattr->ia_size); |
| #endif |
| } |
| |
| v9fs_invalidate_inode_attr(inode); |
| setattr_copy(&nop_mnt_idmap, inode, iattr); |
| mark_inode_dirty(inode); |
| if (iattr->ia_valid & ATTR_MODE) { |
| /* We also want to update ACL when we update mode bits */ |
| retval = v9fs_acl_chmod(inode, fid); |
| if (retval < 0) { |
| if (use_dentry) |
| p9_fid_put(fid); |
| return retval; |
| } |
| } |
| if (use_dentry) |
| p9_fid_put(fid); |
| |
| return 0; |
| } |
| |
| /** |
| * v9fs_stat2inode_dotl - populate an inode structure with stat info |
| * @stat: stat structure |
| * @inode: inode to populate |
| * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) |
| * |
| */ |
| |
| void |
| v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, |
| unsigned int flags) |
| { |
| umode_t mode; |
| struct v9fs_inode *v9inode = V9FS_I(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_set_ctime(inode, stat->st_ctime_sec, |
| stat->st_ctime_nsec); |
| inode->i_uid = stat->st_uid; |
| inode->i_gid = stat->st_gid; |
| set_nlink(inode, stat->st_nlink); |
| |
| mode = stat->st_mode & S_IALLUGO; |
| mode |= inode->i_mode & ~S_IALLUGO; |
| inode->i_mode = mode; |
| |
| if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) |
| v9fs_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_set_ctime(inode, stat->st_ctime_sec, |
| 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) |
| set_nlink(inode, stat->st_nlink); |
| if (stat->st_result_mask & P9_STATS_MODE) { |
| mode = stat->st_mode & S_IALLUGO; |
| mode |= inode->i_mode & ~S_IALLUGO; |
| inode->i_mode = mode; |
| } |
| if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) && |
| stat->st_result_mask & P9_STATS_SIZE) |
| v9fs_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. |
| */ |
| v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; |
| } |
| |
| static int |
| v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir, |
| struct dentry *dentry, const char *symname) |
| { |
| int err; |
| kgid_t gid; |
| const unsigned char *name; |
| struct p9_qid qid; |
| struct inode *inode; |
| struct p9_fid *dfid; |
| struct p9_fid *fid = NULL; |
| struct v9fs_session_info *v9ses; |
| |
| name = dentry->d_name.name; |
| p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); |
| v9ses = v9fs_inode2v9ses(dir); |
| |
| 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; |
| } |
| |
| 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, symname, gid, &qid); |
| |
| if (err < 0) { |
| p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); |
| goto error; |
| } |
| |
| v9fs_invalidate_inode_attr(dir); |
| if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { |
| /* 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_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", |
| err); |
| goto error; |
| } |
| |
| /* instantiate inode and assign the unopened fid to 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); |
| err = 0; |
| } else { |
| /* Not in cached mode. No need to populate inode with stat */ |
| inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); |
| if (IS_ERR(inode)) { |
| err = PTR_ERR(inode); |
| goto error; |
| } |
| d_instantiate(dentry, inode); |
| } |
| |
| error: |
| p9_fid_put(fid); |
| p9_fid_put(dfid); |
| 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; |
| struct v9fs_session_info *v9ses; |
| |
| p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n", |
| dir->i_ino, old_dentry, dentry); |
| |
| v9ses = v9fs_inode2v9ses(dir); |
| dfid = v9fs_parent_fid(dentry); |
| if (IS_ERR(dfid)) |
| return PTR_ERR(dfid); |
| |
| oldfid = v9fs_fid_lookup(old_dentry); |
| if (IS_ERR(oldfid)) { |
| p9_fid_put(dfid); |
| return PTR_ERR(oldfid); |
| } |
| |
| err = p9_client_link(dfid, oldfid, dentry->d_name.name); |
| |
| p9_fid_put(dfid); |
| p9_fid_put(oldfid); |
| if (err < 0) { |
| p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); |
| return err; |
| } |
| |
| v9fs_invalidate_inode_attr(dir); |
| if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { |
| /* Get the latest stat info from server. */ |
| struct p9_fid *fid; |
| |
| fid = v9fs_fid_lookup(old_dentry); |
| if (IS_ERR(fid)) |
| return PTR_ERR(fid); |
| |
| v9fs_refresh_inode_dotl(fid, d_inode(old_dentry)); |
| p9_fid_put(fid); |
| } |
| ihold(d_inode(old_dentry)); |
| d_instantiate(dentry, d_inode(old_dentry)); |
| |
| return err; |
| } |
| |
| /** |
| * v9fs_vfs_mknod_dotl - create a special file |
| * @idmap: The idmap of the mount |
| * @dir: inode destination for new link |
| * @dentry: dentry for file |
| * @omode: mode for creation |
| * @rdev: device associated with special file |
| * |
| */ |
| static int |
| v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir, |
| struct dentry *dentry, umode_t omode, dev_t rdev) |
| { |
| int err; |
| kgid_t gid; |
| const unsigned char *name; |
| umode_t mode; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid = NULL, *dfid = NULL; |
| struct inode *inode; |
| struct p9_qid qid; |
| struct posix_acl *dacl = NULL, *pacl = NULL; |
| |
| p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n", |
| dir->i_ino, dentry, omode, |
| MAJOR(rdev), MINOR(rdev)); |
| |
| v9ses = v9fs_inode2v9ses(dir); |
| dfid = v9fs_parent_fid(dentry); |
| if (IS_ERR(dfid)) { |
| err = PTR_ERR(dfid); |
| p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| 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_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", |
| err); |
| goto error; |
| } |
| name = dentry->d_name.name; |
| |
| err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); |
| if (err < 0) |
| goto error; |
| |
| v9fs_invalidate_inode_attr(dir); |
| 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); |
| goto error; |
| } |
| |
| /* instantiate inode and assign the unopened fid to the dentry */ |
| if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { |
| 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_set_create_acl(inode, fid, dacl, pacl); |
| v9fs_fid_add(dentry, &fid); |
| d_instantiate(dentry, inode); |
| err = 0; |
| } 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, rdev); |
| if (IS_ERR(inode)) { |
| err = PTR_ERR(inode); |
| goto error; |
| } |
| v9fs_set_create_acl(inode, fid, dacl, pacl); |
| d_instantiate(dentry, inode); |
| } |
| error: |
| p9_fid_put(fid); |
| v9fs_put_acl(dacl, pacl); |
| p9_fid_put(dfid); |
| |
| return err; |
| } |
| |
| /** |
| * v9fs_vfs_get_link_dotl - follow a symlink path |
| * @dentry: dentry for symlink |
| * @inode: inode for symlink |
| * @done: destructor for return value |
| */ |
| |
| static const char * |
| v9fs_vfs_get_link_dotl(struct dentry *dentry, |
| struct inode *inode, |
| struct delayed_call *done) |
| { |
| struct p9_fid *fid; |
| char *target; |
| int retval; |
| |
| if (!dentry) |
| return ERR_PTR(-ECHILD); |
| |
| p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); |
| |
| fid = v9fs_fid_lookup(dentry); |
| if (IS_ERR(fid)) |
| return ERR_CAST(fid); |
| retval = p9_client_readlink(fid, &target); |
| p9_fid_put(fid); |
| if (retval) |
| return ERR_PTR(retval); |
| set_delayed_call(done, kfree_link, target); |
| return target; |
| } |
| |
| int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) |
| { |
| struct p9_stat_dotl *st; |
| struct v9fs_session_info *v9ses; |
| unsigned int flags; |
| |
| v9ses = v9fs_inode2v9ses(inode); |
| st = p9_client_getattr_dotl(fid, P9_STATS_ALL); |
| if (IS_ERR(st)) |
| return PTR_ERR(st); |
| /* |
| * Don't update inode if the file type is different |
| */ |
| if (inode_wrong_type(inode, st->st_mode)) |
| goto out; |
| |
| /* |
| * We don't want to refresh inode->i_size, |
| * because we may have cached data |
| */ |
| flags = (v9ses->cache & CACHE_LOOSE) ? |
| V9FS_STAT2INODE_KEEP_ISIZE : 0; |
| v9fs_stat2inode_dotl(st, inode, flags); |
| out: |
| kfree(st); |
| return 0; |
| } |
| |
| const struct inode_operations v9fs_dir_inode_operations_dotl = { |
| .create = v9fs_vfs_create_dotl, |
| .atomic_open = v9fs_vfs_atomic_open_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, |
| .listxattr = v9fs_listxattr, |
| .get_inode_acl = v9fs_iop_get_inode_acl, |
| .get_acl = v9fs_iop_get_acl, |
| .set_acl = v9fs_iop_set_acl, |
| }; |
| |
| const struct inode_operations v9fs_file_inode_operations_dotl = { |
| .getattr = v9fs_vfs_getattr_dotl, |
| .setattr = v9fs_vfs_setattr_dotl, |
| .listxattr = v9fs_listxattr, |
| .get_inode_acl = v9fs_iop_get_inode_acl, |
| .get_acl = v9fs_iop_get_acl, |
| .set_acl = v9fs_iop_set_acl, |
| }; |
| |
| const struct inode_operations v9fs_symlink_inode_operations_dotl = { |
| .get_link = v9fs_vfs_get_link_dotl, |
| .getattr = v9fs_vfs_getattr_dotl, |
| .setattr = v9fs_vfs_setattr_dotl, |
| .listxattr = v9fs_listxattr, |
| }; |