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- /*
- * 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
- *
- */
- #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/smp_lock.h>
- #include <linux/inet.h>
- #include <linux/namei.h>
- #include <linux/idr.h>
- #include "debug.h"
- #include "v9fs.h"
- #include "9p.h"
- #include "v9fs_vfs.h"
- #include "fid.h"
- static const struct inode_operations v9fs_dir_inode_operations;
- static const struct inode_operations v9fs_dir_inode_operations_ext;
- 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 int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
- {
- int res;
- res = mode & 0777;
- if (S_ISDIR(mode))
- res |= V9FS_DMDIR;
- if (v9ses->extended) {
- if (S_ISLNK(mode))
- res |= V9FS_DMSYMLINK;
- if (v9ses->nodev == 0) {
- if (S_ISSOCK(mode))
- res |= V9FS_DMSOCKET;
- if (S_ISFIFO(mode))
- res |= V9FS_DMNAMEDPIPE;
- if (S_ISBLK(mode))
- res |= V9FS_DMDEVICE;
- if (S_ISCHR(mode))
- res |= V9FS_DMDEVICE;
- }
- if ((mode & S_ISUID) == S_ISUID)
- res |= V9FS_DMSETUID;
- if ((mode & S_ISGID) == S_ISGID)
- res |= V9FS_DMSETGID;
- if ((mode & V9FS_DMLINK))
- res |= V9FS_DMLINK;
- }
- return res;
- }
- /**
- * p9mode2unixmode- convert plan9 mode bits to unix mode bits
- * @v9ses: v9fs session information
- * @mode: mode to convert
- *
- */
- static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
- {
- int res;
- res = mode & 0777;
- if ((mode & V9FS_DMDIR) == V9FS_DMDIR)
- res |= S_IFDIR;
- else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended))
- res |= S_IFLNK;
- else if ((mode & V9FS_DMSOCKET) && (v9ses->extended)
- && (v9ses->nodev == 0))
- res |= S_IFSOCK;
- else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended)
- && (v9ses->nodev == 0))
- res |= S_IFIFO;
- else if ((mode & V9FS_DMDEVICE) && (v9ses->extended)
- && (v9ses->nodev == 0))
- res |= S_IFBLK;
- else
- res |= S_IFREG;
- if (v9ses->extended) {
- if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID)
- res |= S_ISUID;
- if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID)
- res |= S_ISGID;
- }
- return res;
- }
- int v9fs_uflags2omode(int uflags)
- {
- int ret;
- ret = 0;
- switch (uflags&3) {
- default:
- case O_RDONLY:
- ret = V9FS_OREAD;
- break;
- case O_WRONLY:
- ret = V9FS_OWRITE;
- break;
- case O_RDWR:
- ret = V9FS_ORDWR;
- break;
- }
- if (uflags & O_EXCL)
- ret |= V9FS_OEXCL;
- if (uflags & O_TRUNC)
- ret |= V9FS_OTRUNC;
- if (uflags & O_APPEND)
- ret |= V9FS_OAPPEND;
- return ret;
- }
- /**
- * v9fs_blank_wstat - helper function to setup a 9P stat structure
- * @v9ses: 9P session info (for determining extended mode)
- * @wstat: structure to initialize
- *
- */
- static void
- v9fs_blank_wstat(struct v9fs_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 = ~0;
- wstat->n_gid = ~0;
- wstat->n_muid = ~0;
- wstat->extension = NULL;
- }
- /**
- * 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, int mode)
- {
- struct inode *inode;
- struct v9fs_session_info *v9ses = sb->s_fs_info;
- dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
- inode = new_inode(sb);
- if (inode) {
- inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
- inode->i_blocks = 0;
- inode->i_rdev = 0;
- inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
- 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(!v9ses->extended) {
- dprintk(DEBUG_ERROR, "special files without extended mode\n");
- return ERR_PTR(-EINVAL);
- }
- init_special_inode(inode, inode->i_mode,
- inode->i_rdev);
- break;
- case S_IFREG:
- inode->i_op = &v9fs_file_inode_operations;
- inode->i_fop = &v9fs_file_operations;
- break;
- case S_IFLNK:
- if(!v9ses->extended) {
- dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n");
- return ERR_PTR(-EINVAL);
- }
- inode->i_op = &v9fs_symlink_inode_operations;
- break;
- case S_IFDIR:
- inc_nlink(inode);
- if(v9ses->extended)
- inode->i_op = &v9fs_dir_inode_operations_ext;
- else
- inode->i_op = &v9fs_dir_inode_operations;
- inode->i_fop = &v9fs_dir_operations;
- break;
- default:
- dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
- mode, mode & S_IFMT);
- return ERR_PTR(-EINVAL);
- }
- } else {
- eprintk(KERN_WARNING, "Problem allocating inode\n");
- return ERR_PTR(-ENOMEM);
- }
- return inode;
- }
- static int
- v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name, u32 perm,
- u8 mode, char *extension, u32 *fidp, struct v9fs_qid *qid, u32 *iounit)
- {
- int fid;
- int err;
- struct v9fs_fcall *fcall;
- fid = v9fs_get_idpool(&v9ses->fidpool);
- if (fid < 0) {
- eprintk(KERN_WARNING, "no free fids available\n");
- return -ENOSPC;
- }
- err = v9fs_t_walk(v9ses, pfid, fid, NULL, &fcall);
- if (err < 0) {
- PRINT_FCALL_ERROR("clone error", fcall);
- if (fcall && fcall->id == RWALK)
- goto clunk_fid;
- else
- goto put_fid;
- }
- kfree(fcall);
- err = v9fs_t_create(v9ses, fid, name, perm, mode, extension, &fcall);
- if (err < 0) {
- PRINT_FCALL_ERROR("create fails", fcall);
- goto clunk_fid;
- }
- if (iounit)
- *iounit = fcall->params.rcreate.iounit;
- if (qid)
- *qid = fcall->params.rcreate.qid;
- if (fidp)
- *fidp = fid;
- kfree(fcall);
- return 0;
- clunk_fid:
- v9fs_t_clunk(v9ses, fid);
- fid = V9FS_NOFID;
- put_fid:
- if (fid != V9FS_NOFID)
- v9fs_put_idpool(fid, &v9ses->fidpool);
- kfree(fcall);
- return err;
- }
- 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);
- }
- static struct inode *
- v9fs_inode_from_fid(struct v9fs_session_info *v9ses, u32 fid,
- struct super_block *sb)
- {
- int err, umode;
- struct inode *ret;
- struct v9fs_fcall *fcall;
- ret = NULL;
- err = v9fs_t_stat(v9ses, fid, &fcall);
- if (err) {
- PRINT_FCALL_ERROR("stat error", fcall);
- goto error;
- }
- umode = p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode);
- ret = v9fs_get_inode(sb, umode);
- if (IS_ERR(ret)) {
- err = PTR_ERR(ret);
- ret = NULL;
- goto error;
- }
- v9fs_stat2inode(&fcall->params.rstat.stat, ret, sb);
- kfree(fcall);
- return ret;
- error:
- kfree(fcall);
- if (ret)
- iput(ret);
- return ERR_PTR(err);
- }
- /**
- * v9fs_remove - helper function to remove files and directories
- * @dir: directory inode that is being deleted
- * @file: dentry that is being deleted
- * @rmdir: removing a directory
- *
- */
- static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
- {
- struct v9fs_fcall *fcall = NULL;
- struct super_block *sb = NULL;
- struct v9fs_session_info *v9ses = NULL;
- struct v9fs_fid *v9fid = NULL;
- struct inode *file_inode = NULL;
- int fid = -1;
- int result = 0;
- dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
- rmdir);
- file_inode = file->d_inode;
- sb = file_inode->i_sb;
- v9ses = v9fs_inode2v9ses(file_inode);
- v9fid = v9fs_fid_clone(file);
- if(IS_ERR(v9fid))
- return PTR_ERR(v9fid);
- fid = v9fid->fid;
- if (fid < 0) {
- dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n",
- file_inode->i_ino);
- return -EBADF;
- }
- result = v9fs_t_remove(v9ses, fid, &fcall);
- if (result < 0) {
- PRINT_FCALL_ERROR("remove fails", fcall);
- goto Error;
- }
- v9fs_put_idpool(fid, &v9ses->fidpool);
- v9fs_fid_destroy(v9fid);
- Error:
- kfree(fcall);
- return result;
- }
- static int
- v9fs_open_created(struct inode *inode, struct file *file)
- {
- return 0;
- }
- /**
- * v9fs_vfs_create - VFS hook to create files
- * @inode: directory inode that is being deleted
- * @dentry: dentry that is being deleted
- * @mode: create permissions
- * @nd: path information
- *
- */
- static int
- v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
- struct nameidata *nd)
- {
- int err;
- u32 fid, perm, iounit;
- int flags;
- struct v9fs_session_info *v9ses;
- struct v9fs_fid *dfid, *vfid, *ffid;
- struct inode *inode;
- struct v9fs_qid qid;
- struct file *filp;
- inode = NULL;
- vfid = NULL;
- v9ses = v9fs_inode2v9ses(dir);
- dfid = v9fs_fid_clone(dentry->d_parent);
- if(IS_ERR(dfid)) {
- err = PTR_ERR(dfid);
- goto error;
- }
- perm = unixmode2p9mode(v9ses, mode);
- if (nd && nd->flags & LOOKUP_OPEN)
- flags = nd->intent.open.flags - 1;
- else
- flags = O_RDWR;
- err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
- perm, v9fs_uflags2omode(flags), NULL, &fid, &qid, &iounit);
- if (err)
- goto clunk_dfid;
- vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
- v9fs_fid_clunk(v9ses, dfid);
- if (IS_ERR(vfid)) {
- err = PTR_ERR(vfid);
- vfid = NULL;
- goto error;
- }
- inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- inode = NULL;
- goto error;
- }
- if(v9ses->cache)
- dentry->d_op = &v9fs_cached_dentry_operations;
- else
- dentry->d_op = &v9fs_dentry_operations;
- d_instantiate(dentry, inode);
- if (nd && nd->flags & LOOKUP_OPEN) {
- ffid = v9fs_fid_create(v9ses, fid);
- if (!ffid)
- return -ENOMEM;
- filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
- if (IS_ERR(filp)) {
- v9fs_fid_destroy(ffid);
- return PTR_ERR(filp);
- }
- ffid->rdir_pos = 0;
- ffid->rdir_fcall = NULL;
- ffid->fidopen = 1;
- ffid->iounit = iounit;
- ffid->filp = filp;
- filp->private_data = ffid;
- }
- return 0;
- clunk_dfid:
- v9fs_fid_clunk(v9ses, dfid);
- error:
- if (vfid)
- v9fs_fid_destroy(vfid);
- return err;
- }
- /**
- * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
- * @inode: 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, int mode)
- {
- int err;
- u32 fid, perm;
- struct v9fs_session_info *v9ses;
- struct v9fs_fid *dfid, *vfid;
- struct inode *inode;
- inode = NULL;
- vfid = NULL;
- v9ses = v9fs_inode2v9ses(dir);
- dfid = v9fs_fid_clone(dentry->d_parent);
- if(IS_ERR(dfid)) {
- err = PTR_ERR(dfid);
- goto error;
- }
- perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
- err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
- perm, V9FS_OREAD, NULL, &fid, NULL, NULL);
- if (err) {
- dprintk(DEBUG_ERROR, "create error %d\n", err);
- goto clean_up_dfid;
- }
- vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
- if (IS_ERR(vfid)) {
- err = PTR_ERR(vfid);
- vfid = NULL;
- goto clean_up_dfid;
- }
- v9fs_fid_clunk(v9ses, dfid);
- inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- inode = NULL;
- v9fs_fid_destroy(vfid);
- goto error;
- }
- if(v9ses->cache)
- dentry->d_op = &v9fs_cached_dentry_operations;
- else
- dentry->d_op = &v9fs_dentry_operations;
- d_instantiate(dentry, inode);
- return 0;
- clean_up_dfid:
- v9fs_fid_clunk(v9ses, dfid);
- error:
- 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?
- * @nameidata: path data
- *
- */
- static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
- struct nameidata *nameidata)
- {
- struct super_block *sb;
- struct v9fs_session_info *v9ses;
- struct v9fs_fid *dirfid;
- struct v9fs_fid *fid;
- struct inode *inode;
- struct v9fs_fcall *fcall = NULL;
- int dirfidnum = -1;
- int newfid = -1;
- int result = 0;
- dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
- dir, dentry->d_name.name, dentry, nameidata);
- sb = dir->i_sb;
- v9ses = v9fs_inode2v9ses(dir);
- dirfid = v9fs_fid_lookup(dentry->d_parent);
- if(IS_ERR(dirfid))
- return ERR_PTR(PTR_ERR(dirfid));
- dirfidnum = dirfid->fid;
- newfid = v9fs_get_idpool(&v9ses->fidpool);
- if (newfid < 0) {
- eprintk(KERN_WARNING, "newfid fails!\n");
- result = -ENOSPC;
- goto Release_Dirfid;
- }
- result = v9fs_t_walk(v9ses, dirfidnum, newfid,
- (char *)dentry->d_name.name, &fcall);
- up(&dirfid->lock);
- if (result < 0) {
- if (fcall && fcall->id == RWALK)
- v9fs_t_clunk(v9ses, newfid);
- else
- v9fs_put_idpool(newfid, &v9ses->fidpool);
- if (result == -ENOENT) {
- d_add(dentry, NULL);
- dprintk(DEBUG_VFS,
- "Return negative dentry %p count %d\n",
- dentry, atomic_read(&dentry->d_count));
- kfree(fcall);
- return NULL;
- }
- dprintk(DEBUG_ERROR, "walk error:%d\n", result);
- goto FreeFcall;
- }
- kfree(fcall);
- result = v9fs_t_stat(v9ses, newfid, &fcall);
- if (result < 0) {
- dprintk(DEBUG_ERROR, "stat error\n");
- goto FreeFcall;
- }
- inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses,
- fcall->params.rstat.stat.mode));
- if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
- eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
- PTR_ERR(inode));
- result = -ENOSPC;
- goto FreeFcall;
- }
- inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid);
- fid = v9fs_fid_create(v9ses, newfid);
- if (fid == NULL) {
- dprintk(DEBUG_ERROR, "couldn't insert\n");
- result = -ENOMEM;
- goto FreeFcall;
- }
- result = v9fs_fid_insert(fid, dentry);
- if (result < 0)
- goto FreeFcall;
- fid->qid = fcall->params.rstat.stat.qid;
- v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb);
- if((fid->qid.version)&&(v9ses->cache))
- dentry->d_op = &v9fs_cached_dentry_operations;
- else
- dentry->d_op = &v9fs_dentry_operations;
- d_add(dentry, inode);
- kfree(fcall);
- return NULL;
- Release_Dirfid:
- up(&dirfid->lock);
- FreeFcall:
- kfree(fcall);
- return ERR_PTR(result);
- }
- /**
- * v9fs_vfs_unlink - VFS unlink hook to delete an inode
- * @i: inode that is being unlinked
- * @d: dentry that is being unlinked
- *
- */
- static 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
- *
- */
- static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
- {
- return v9fs_remove(i, d, 1);
- }
- /**
- * 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
- *
- */
- static int
- v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry)
- {
- struct inode *old_inode = old_dentry->d_inode;
- struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode);
- struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
- struct v9fs_fid *olddirfid;
- struct v9fs_fid *newdirfid;
- struct v9fs_wstat wstat;
- struct v9fs_fcall *fcall = NULL;
- int fid = -1;
- int olddirfidnum = -1;
- int newdirfidnum = -1;
- int retval = 0;
- dprintk(DEBUG_VFS, "\n");
- if(IS_ERR(oldfid))
- return PTR_ERR(oldfid);
- olddirfid = v9fs_fid_clone(old_dentry->d_parent);
- if(IS_ERR(olddirfid)) {
- retval = PTR_ERR(olddirfid);
- goto Release_lock;
- }
- newdirfid = v9fs_fid_clone(new_dentry->d_parent);
- if(IS_ERR(newdirfid)) {
- retval = PTR_ERR(newdirfid);
- goto Clunk_olddir;
- }
- /* 9P can only handle file rename in the same directory */
- if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
- dprintk(DEBUG_ERROR, "old dir and new dir are different\n");
- retval = -EXDEV;
- goto Clunk_newdir;
- }
- fid = oldfid->fid;
- olddirfidnum = olddirfid->fid;
- newdirfidnum = newdirfid->fid;
- if (fid < 0) {
- dprintk(DEBUG_ERROR, "no fid for old file #%lu\n",
- old_inode->i_ino);
- retval = -EBADF;
- goto Clunk_newdir;
- }
- v9fs_blank_wstat(&wstat);
- wstat.muid = v9ses->name;
- wstat.name = (char *) new_dentry->d_name.name;
- retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall);
- if (retval < 0)
- PRINT_FCALL_ERROR("wstat error", fcall);
- kfree(fcall);
- Clunk_newdir:
- v9fs_fid_clunk(v9ses, newdirfid);
- Clunk_olddir:
- v9fs_fid_clunk(v9ses, olddirfid);
- Release_lock:
- up(&oldfid->lock);
- return retval;
- }
- /**
- * v9fs_vfs_getattr - retrieve file metadata
- * @mnt - mount information
- * @dentry - file to get attributes on
- * @stat - metadata structure to populate
- *
- */
- static int
- v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
- struct kstat *stat)
- {
- struct v9fs_fcall *fcall = NULL;
- struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
- struct v9fs_fid *fid = v9fs_fid_clone(dentry);
- int err = -EPERM;
- dprintk(DEBUG_VFS, "dentry: %p\n", dentry);
- if(IS_ERR(fid))
- return PTR_ERR(fid);
- err = v9fs_t_stat(v9ses, fid->fid, &fcall);
- if (err < 0)
- dprintk(DEBUG_ERROR, "stat error\n");
- else {
- v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode,
- dentry->d_inode->i_sb);
- generic_fillattr(dentry->d_inode, stat);
- }
- kfree(fcall);
- v9fs_fid_clunk(v9ses, fid);
- return err;
- }
- /**
- * 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)
- {
- struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
- struct v9fs_fid *fid = v9fs_fid_clone(dentry);
- struct v9fs_fcall *fcall = NULL;
- struct v9fs_wstat wstat;
- int res = -EPERM;
- dprintk(DEBUG_VFS, "\n");
- 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 (v9ses->extended) {
- if (iattr->ia_valid & ATTR_UID)
- wstat.n_uid = iattr->ia_uid;
- if (iattr->ia_valid & ATTR_GID)
- wstat.n_gid = iattr->ia_gid;
- }
- res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall);
- if (res < 0)
- PRINT_FCALL_ERROR("wstat error", fcall);
- kfree(fcall);
- if (res >= 0)
- res = inode_setattr(dentry->d_inode, iattr);
- v9fs_fid_clunk(v9ses, fid);
- return res;
- }
- /**
- * 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 v9fs_stat *stat, struct inode *inode,
- struct super_block *sb)
- {
- int n;
- char ext[32];
- struct v9fs_session_info *v9ses = sb->s_fs_info;
- inode->i_nlink = 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->uid;
- inode->i_gid = v9ses->gid;
- if (v9ses->extended) {
- inode->i_uid = stat->n_uid;
- inode->i_gid = stat->n_gid;
- }
- inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
- if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
- char type = 0;
- int major = -1;
- int minor = -1;
- n = stat->extension.len;
- if (n > sizeof(ext)-1)
- n = sizeof(ext)-1;
- memmove(ext, stat->extension.str, n);
- ext[n] = 0;
- sscanf(ext, "%c %u %u", &type, &major, &minor);
- switch (type) {
- case 'c':
- inode->i_mode &= ~S_IFBLK;
- inode->i_mode |= S_IFCHR;
- break;
- case 'b':
- break;
- default:
- dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n",
- type, stat->extension.len, stat->extension.str);
- };
- inode->i_rdev = MKDEV(major, minor);
- } else
- inode->i_rdev = 0;
- inode->i_size = stat->length;
- inode->i_blocks =
- (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
- }
- /**
- * v9fs_qid2ino - convert qid into inode number
- * @qid: qid to hash
- *
- * BUG: potential for inode number collisions?
- */
- ino_t v9fs_qid2ino(struct v9fs_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_readlink - read a symlink's location (internal version)
- * @dentry: dentry for symlink
- * @buffer: buffer to load symlink location into
- * @buflen: length of buffer
- *
- */
- static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
- {
- int retval = -EPERM;
- struct v9fs_fcall *fcall = NULL;
- struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
- struct v9fs_fid *fid = v9fs_fid_clone(dentry);
- if(IS_ERR(fid))
- return PTR_ERR(fid);
- if (!v9ses->extended) {
- retval = -EBADF;
- dprintk(DEBUG_ERROR, "not extended\n");
- goto ClunkFid;
- }
- dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name);
- retval = v9fs_t_stat(v9ses, fid->fid, &fcall);
- if (retval < 0) {
- dprintk(DEBUG_ERROR, "stat error\n");
- goto FreeFcall;
- }
- if (!fcall) {
- retval = -EIO;
- goto ClunkFid;
- }
- if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) {
- retval = -EINVAL;
- goto FreeFcall;
- }
- /* copy extension buffer into buffer */
- if (fcall->params.rstat.stat.extension.len < buflen)
- buflen = fcall->params.rstat.stat.extension.len + 1;
- memmove(buffer, fcall->params.rstat.stat.extension.str, buflen - 1);
- buffer[buflen-1] = 0;
- dprintk(DEBUG_ERROR, "%s -> %.*s (%s)\n", dentry->d_name.name, fcall->params.rstat.stat.extension.len,
- fcall->params.rstat.stat.extension.str, buffer);
- retval = buflen;
- FreeFcall:
- kfree(fcall);
- ClunkFid:
- v9fs_fid_clunk(v9ses, fid);
- return retval;
- }
- /**
- * v9fs_vfs_readlink - read a symlink's location
- * @dentry: dentry for symlink
- * @buf: buffer to load symlink location into
- * @buflen: length of buffer
- *
- */
- static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
- int buflen)
- {
- int retval;
- int ret;
- char *link = __getname();
- if (unlikely(!link))
- return -ENOMEM;
- if (buflen > PATH_MAX)
- buflen = PATH_MAX;
- dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
- retval = v9fs_readlink(dentry, link, buflen);
- if (retval > 0) {
- if ((ret = copy_to_user(buffer, link, retval)) != 0) {
- dprintk(DEBUG_ERROR, "problem copying to user: %d\n",
- ret);
- retval = ret;
- }
- }
- __putname(link);
- return retval;
- }
- /**
- * v9fs_vfs_follow_link - follow a symlink path
- * @dentry: dentry for symlink
- * @nd: nameidata
- *
- */
- static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
- {
- int len = 0;
- char *link = __getname();
- dprintk(DEBUG_VFS, "%s n", dentry->d_name.name);
- if (!link)
- link = ERR_PTR(-ENOMEM);
- else {
- len = v9fs_readlink(dentry, link, PATH_MAX);
- if (len < 0) {
- __putname(link);
- link = ERR_PTR(len);
- } else
- link[len] = 0;
- }
- nd_set_link(nd, link);
- return NULL;
- }
- /**
- * v9fs_vfs_put_link - release a symlink path
- * @dentry: dentry for symlink
- * @nd: nameidata
- *
- */
- static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
- {
- char *s = nd_get_link(nd);
- dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
- if (!IS_ERR(s))
- __putname(s);
- }
- static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
- int mode, const char *extension)
- {
- int err;
- u32 fid, perm;
- struct v9fs_session_info *v9ses;
- struct v9fs_fid *dfid, *vfid = NULL;
- struct inode *inode = NULL;
- v9ses = v9fs_inode2v9ses(dir);
- if (!v9ses->extended) {
- dprintk(DEBUG_ERROR, "not extended\n");
- return -EPERM;
- }
- dfid = v9fs_fid_clone(dentry->d_parent);
- if(IS_ERR(dfid)) {
- err = PTR_ERR(dfid);
- goto error;
- }
- perm = unixmode2p9mode(v9ses, mode);
- err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
- perm, V9FS_OREAD, (char *) extension, &fid, NULL, NULL);
- if (err)
- goto clunk_dfid;
- err = v9fs_t_clunk(v9ses, fid);
- if (err)
- goto clunk_dfid;
- vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
- if (IS_ERR(vfid)) {
- err = PTR_ERR(vfid);
- vfid = NULL;
- goto clunk_dfid;
- }
- inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- inode = NULL;
- goto free_vfid;
- }
- if(v9ses->cache)
- dentry->d_op = &v9fs_cached_dentry_operations;
- else
- dentry->d_op = &v9fs_dentry_operations;
- d_instantiate(dentry, inode);
- return 0;
- free_vfid:
- v9fs_fid_destroy(vfid);
- clunk_dfid:
- v9fs_fid_clunk(v9ses, dfid);
- error:
- return err;
- }
- /**
- * v9fs_vfs_symlink - helper function to create symlinks
- * @dir: directory inode containing symlink
- * @dentry: dentry for symlink
- * @symname: symlink data
- *
- * See 9P2000.u RFC for more information
- *
- */
- static int
- v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
- {
- dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
- symname);
- return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
- }
- /**
- * v9fs_vfs_link - create a hardlink
- * @old_dentry: dentry for file to link to
- * @dir: inode destination for new link
- * @dentry: dentry for link
- *
- */
- /* XXX - lots of code dup'd from symlink and creates,
- * figure out a better reuse strategy
- */
- static int
- v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
- struct dentry *dentry)
- {
- int retval;
- struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
- struct v9fs_fid *oldfid;
- char *name;
- dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
- old_dentry->d_name.name);
- oldfid = v9fs_fid_clone(old_dentry);
- if(IS_ERR(oldfid))
- return PTR_ERR(oldfid);
- name = __getname();
- if (unlikely(!name)) {
- retval = -ENOMEM;
- goto clunk_fid;
- }
- sprintf(name, "%d\n", oldfid->fid);
- retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name);
- __putname(name);
- clunk_fid:
- v9fs_fid_clunk(v9ses, oldfid);
- return retval;
- }
- /**
- * v9fs_vfs_mknod - create a special file
- * @dir: inode destination for new link
- * @dentry: dentry for file
- * @mode: mode for creation
- * @dev_t: device associated with special file
- *
- */
- static int
- v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
- {
- int retval;
- char *name;
- dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
- dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
- if (!new_valid_dev(rdev))
- return -EINVAL;
- name = __getname();
- if (!name)
- return -ENOMEM;
- /* 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 if (S_ISFIFO(mode))
- *name = 0;
- else {
- __putname(name);
- return -EINVAL;
- }
- retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
- __putname(name);
- return retval;
- }
- static const struct inode_operations v9fs_dir_inode_operations_ext = {
- .create = v9fs_vfs_create,
- .lookup = v9fs_vfs_lookup,
- .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,
- .readlink = v9fs_vfs_readlink,
- .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,
- .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 = {
- .readlink = v9fs_vfs_readlink,
- .follow_link = v9fs_vfs_follow_link,
- .put_link = v9fs_vfs_put_link,
- .getattr = v9fs_vfs_getattr,
- .setattr = v9fs_vfs_setattr,
- };
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