diff options
Diffstat (limited to 'fs/9p/vfs_inode.c')
| -rw-r--r-- | fs/9p/vfs_inode.c | 1338 |
1 files changed, 1338 insertions, 0 deletions
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c new file mode 100644 index 000000000000..0c13fc600049 --- /dev/null +++ b/fs/9p/vfs_inode.c @@ -0,0 +1,1338 @@ +/* + * 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 as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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 "conv.h" +#include "fid.h" + +static struct inode_operations v9fs_dir_inode_operations; +static struct inode_operations v9fs_dir_inode_operations_ext; +static struct inode_operations v9fs_file_inode_operations; +static 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; +} + +/** + * v9fs_blank_mistat - helper function to setup a 9P stat structure + * @v9ses: 9P session info (for determining extended mode) + * @mistat: structure to initialize + * + */ + +static void +v9fs_blank_mistat(struct v9fs_session_info *v9ses, struct v9fs_stat *mistat) +{ + mistat->type = ~0; + mistat->dev = ~0; + mistat->qid.type = ~0; + mistat->qid.version = ~0; + *((long long *)&mistat->qid.path) = ~0; + mistat->mode = ~0; + mistat->atime = ~0; + mistat->mtime = ~0; + mistat->length = ~0; + mistat->name = mistat->data; + mistat->uid = mistat->data; + mistat->gid = mistat->data; + mistat->muid = mistat->data; + if (v9ses->extended) { + mistat->n_uid = ~0; + mistat->n_gid = ~0; + mistat->n_muid = ~0; + mistat->extension = mistat->data; + } + *mistat->data = 0; +} + +/** + * v9fs_mistat2unix - convert mistat to unix stat + * @mistat: Plan 9 metadata (mistat) structure + * @buf: unix metadata (stat) structure to populate + * @sb: superblock + * + */ + +static void +v9fs_mistat2unix(struct v9fs_stat *mistat, struct stat *buf, + struct super_block *sb) +{ + struct v9fs_session_info *v9ses = sb ? sb->s_fs_info : NULL; + + buf->st_nlink = 1; + + buf->st_atime = mistat->atime; + buf->st_mtime = mistat->mtime; + buf->st_ctime = mistat->mtime; + + buf->st_uid = (unsigned short)-1; + buf->st_gid = (unsigned short)-1; + + if (v9ses && v9ses->extended) { + /* TODO: string to uid mapping via user-space daemon */ + if (mistat->n_uid != -1) + sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid); + + if (mistat->n_gid != -1) + sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid); + } + + if (buf->st_uid == (unsigned short)-1) + buf->st_uid = v9ses->uid; + if (buf->st_gid == (unsigned short)-1) + buf->st_gid = v9ses->gid; + + buf->st_mode = p9mode2unixmode(v9ses, mistat->mode); + if ((S_ISBLK(buf->st_mode)) || (S_ISCHR(buf->st_mode))) { + char type = 0; + int major = -1; + int minor = -1; + sscanf(mistat->extension, "%c %u %u", &type, &major, &minor); + switch (type) { + case 'c': + buf->st_mode &= ~S_IFBLK; + buf->st_mode |= S_IFCHR; + break; + case 'b': + break; + default: + dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n", + type, mistat->extension); + }; + buf->st_rdev = MKDEV(major, minor); + } else + buf->st_rdev = 0; + + buf->st_size = mistat->length; + + buf->st_blksize = sb->s_blocksize; + buf->st_blocks = + (buf->st_size + buf->st_blksize - 1) >> sb->s_blocksize_bits; +} + +/** + * 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 = NULL; + 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_blksize = sb->s_blocksize; + inode->i_blocks = 0; + inode->i_rdev = 0; + inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; + + 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: + inode->i_nlink++; + 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; +} + +/** + * v9fs_create - helper function to create files and directories + * @dir: directory inode file is being created in + * @file_dentry: dentry file is being created in + * @perm: permissions file is being created with + * @open_mode: resulting open mode for file + * + */ + +static int +v9fs_create(struct inode *dir, + struct dentry *file_dentry, + unsigned int perm, unsigned int open_mode) +{ + struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); + struct super_block *sb = dir->i_sb; + struct v9fs_fid *dirfid = + v9fs_fid_lookup(file_dentry->d_parent, FID_WALK); + struct v9fs_fid *fid = NULL; + struct inode *file_inode = NULL; + struct v9fs_fcall *fcall = NULL; + struct v9fs_qid qid; + struct stat newstat; + int dirfidnum = -1; + long newfid = -1; + int result = 0; + unsigned int iounit = 0; + + perm = unixmode2p9mode(v9ses, perm); + + dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir, + file_dentry, perm, open_mode); + + if (!dirfid) + return -EBADF; + + dirfidnum = dirfid->fid; + if (dirfidnum < 0) { + dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n", + dir->i_ino); + return -EBADF; + } + + if (file_dentry->d_inode) { + dprintk(DEBUG_ERROR, + "Odd. There is an inode for dir %lu, name :%s:\n", + dir->i_ino, file_dentry->d_name.name); + return -EEXIST; + } + + newfid = v9fs_get_idpool(&v9ses->fidpool); + if (newfid < 0) { + eprintk(KERN_WARNING, "no free fids available\n"); + return -ENOSPC; + } + + result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall); + if (result < 0) { + dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall)); + v9fs_put_idpool(newfid, &v9ses->fidpool); + newfid = 0; + goto CleanUpFid; + } + + kfree(fcall); + + result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name, + perm, open_mode, &fcall); + if (result < 0) { + dprintk(DEBUG_ERROR, "create fails: %s(%d)\n", + FCALL_ERROR(fcall), result); + + goto CleanUpFid; + } + + iounit = fcall->params.rcreate.iounit; + qid = fcall->params.rcreate.qid; + kfree(fcall); + + fid = v9fs_fid_create(file_dentry); + if (!fid) { + result = -ENOMEM; + goto CleanUpFid; + } + + fid->fid = newfid; + fid->fidopen = 0; + fid->fidcreate = 1; + fid->qid = qid; + fid->iounit = iounit; + fid->rdir_pos = 0; + fid->rdir_fcall = NULL; + fid->v9ses = v9ses; + + if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) || + (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) || + (perm & V9FS_DMDEVICE)) + return 0; + + result = v9fs_t_stat(v9ses, newfid, &fcall); + if (result < 0) { + dprintk(DEBUG_ERROR, "stat error: %s(%d)\n", FCALL_ERROR(fcall), + result); + goto CleanUpFid; + } + + v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); + + file_inode = v9fs_get_inode(sb, newstat.st_mode); + if ((!file_inode) || IS_ERR(file_inode)) { + dprintk(DEBUG_ERROR, "create inode failed\n"); + result = -EBADF; + goto CleanUpFid; + } + + v9fs_mistat2inode(fcall->params.rstat.stat, file_inode, sb); + kfree(fcall); + d_instantiate(file_dentry, file_inode); + + if (perm & V9FS_DMDIR) { + if (v9fs_t_clunk(v9ses, newfid, &fcall)) + dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n", + FCALL_ERROR(fcall)); + + v9fs_put_idpool(newfid, &v9ses->fidpool); + kfree(fcall); + fid->fidopen = 0; + fid->fidcreate = 0; + d_drop(file_dentry); + } + + return 0; + + CleanUpFid: + kfree(fcall); + + if (newfid) { + if (v9fs_t_clunk(v9ses, newfid, &fcall)) + dprintk(DEBUG_ERROR, "clunk failed: %s\n", + FCALL_ERROR(fcall)); + + v9fs_put_idpool(newfid, &v9ses->fidpool); + kfree(fcall); + } + return result; +} + +/** + * 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_lookup(file, FID_OP); + + if (!v9fid) { + dprintk(DEBUG_ERROR, + "no v9fs_fid\n"); + return -EBADF; + } + + 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) + dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n", + FCALL_ERROR(fcall), result); + else { + v9fs_put_idpool(fid, &v9ses->fidpool); + v9fs_fid_destroy(v9fid); + } + + kfree(fcall); + return result; +} + +/** + * v9fs_vfs_create - VFS hook to create files + * @inode: directory inode that is being deleted + * @dentry: dentry that is being deleted + * @perm: create permissions + * @nd: path information + * + */ + +static int +v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm, + struct nameidata *nd) +{ + return v9fs_create(inode, dentry, perm, O_RDWR); +} + +/** + * 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 *inode, struct dentry *dentry, int mode) +{ + return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY); +} + +/** + * 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; + struct stat newstat; + int dirfidnum = -1; + int newfid = -1; + int result = 0; + + dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", + dir, dentry->d_iname, dentry, nameidata); + + sb = dir->i_sb; + v9ses = v9fs_inode2v9ses(dir); + dirfid = v9fs_fid_lookup(dentry->d_parent, FID_WALK); + + if (!dirfid) { + dprintk(DEBUG_ERROR, "no dirfid\n"); + return ERR_PTR(-EINVAL); + } + + dirfidnum = dirfid->fid; + + if (dirfidnum < 0) { + dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n", + dir, dir->i_ino); + return ERR_PTR(-EBADF); + } + + newfid = v9fs_get_idpool(&v9ses->fidpool); + if (newfid < 0) { + eprintk(KERN_WARNING, "newfid fails!\n"); + return ERR_PTR(-ENOSPC); + } + + result = + v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name, + NULL); + if (result < 0) { + v9fs_put_idpool(newfid, &v9ses->fidpool); + if (result == -ENOENT) { + d_add(dentry, NULL); + dprintk(DEBUG_ERROR, + "Return negative dentry %p count %d\n", + dentry, atomic_read(&dentry->d_count)); + return NULL; + } + dprintk(DEBUG_ERROR, "walk error:%d\n", result); + goto FreeFcall; + } + + result = v9fs_t_stat(v9ses, newfid, &fcall); + if (result < 0) { + dprintk(DEBUG_ERROR, "stat error\n"); + goto FreeFcall; + } + + v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); + inode = v9fs_get_inode(sb, newstat.st_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(dentry); + if (fid == NULL) { + dprintk(DEBUG_ERROR, "couldn't insert\n"); + result = -ENOMEM; + goto FreeFcall; + } + + fid->fid = newfid; + fid->fidopen = 0; + fid->v9ses = v9ses; + fid->qid = fcall->params.rstat.stat->qid; + + dentry->d_op = &v9fs_dentry_operations; + v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb); + + d_add(dentry, inode); + kfree(fcall); + + return NULL; + + 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, FID_WALK); + struct v9fs_fid *olddirfid = + v9fs_fid_lookup(old_dentry->d_parent, FID_WALK); + struct v9fs_fid *newdirfid = + v9fs_fid_lookup(new_dentry->d_parent, FID_WALK); + struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); + struct v9fs_fcall *fcall = NULL; + int fid = -1; + int olddirfidnum = -1; + int newdirfidnum = -1; + int retval = 0; + + dprintk(DEBUG_VFS, "\n"); + + if (!mistat) + return -ENOMEM; + + if ((!oldfid) || (!olddirfid) || (!newdirfid)) { + dprintk(DEBUG_ERROR, "problem with arguments\n"); + return -EBADF; + } + + /* 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 = -EPERM; + goto FreeFcallnBail; + } + + 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 FreeFcallnBail; + } + + v9fs_blank_mistat(v9ses, mistat); + + strcpy(mistat->data + 1, v9ses->name); + mistat->name = mistat->data + 1 + strlen(v9ses->name); + + if (new_dentry->d_name.len > + (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) { + dprintk(DEBUG_ERROR, "new name too long\n"); + goto FreeFcallnBail; + } + + strcpy(mistat->name, new_dentry->d_name.name); + retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall); + + FreeFcallnBail: + kfree(mistat); + + if (retval < 0) + dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", + FCALL_ERROR(fcall)); + + kfree(fcall); + return retval; +} + +/** + * v9fs_vfs_getattr - retreive 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_lookup(dentry, FID_OP); + int err = -EPERM; + + dprintk(DEBUG_VFS, "dentry: %p\n", dentry); + if (!fid) { + dprintk(DEBUG_ERROR, + "couldn't find fid associated with dentry\n"); + return -EBADF; + } + + err = v9fs_t_stat(v9ses, fid->fid, &fcall); + + if (err < 0) + dprintk(DEBUG_ERROR, "stat error\n"); + else { + v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode, + dentry->d_inode->i_sb); + generic_fillattr(dentry->d_inode, stat); + } + + kfree(fcall); + 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_lookup(dentry, FID_OP); + struct v9fs_fcall *fcall = NULL; + struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); + int res = -EPERM; + + dprintk(DEBUG_VFS, "\n"); + + if (!mistat) + return -ENOMEM; + + if (!fid) { + dprintk(DEBUG_ERROR, + "Couldn't find fid associated with dentry\n"); + return -EBADF; + } + + v9fs_blank_mistat(v9ses, mistat); + if (iattr->ia_valid & ATTR_MODE) + mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode); + + if (iattr->ia_valid & ATTR_MTIME) + mistat->mtime = iattr->ia_mtime.tv_sec; + + if (iattr->ia_valid & ATTR_ATIME) + mistat->atime = iattr->ia_atime.tv_sec; + + if (iattr->ia_valid & ATTR_SIZE) + mistat->length = iattr->ia_size; + + if (v9ses->extended) { + char *ptr = mistat->data+1; + + if (iattr->ia_valid & ATTR_UID) { + mistat->uid = ptr; + ptr += 1+sprintf(ptr, "%08x", iattr->ia_uid); + mistat->n_uid = iattr->ia_uid; + } + + if (iattr->ia_valid & ATTR_GID) { + mistat->gid = ptr; + ptr += 1+sprintf(ptr, "%08x", iattr->ia_gid); + mistat->n_gid = iattr->ia_gid; + } + } + + res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall); + + if (res < 0) + dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall)); + + kfree(mistat); + kfree(fcall); + + if (res >= 0) + res = inode_setattr(dentry->d_inode, iattr); + + return res; +} + +/** + * v9fs_mistat2inode - populate an inode structure with mistat info + * @mistat: Plan 9 metadata (mistat) structure + * @inode: inode to populate + * @sb: superblock of filesystem + * + */ + +void +v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode, + struct super_block *sb) +{ + struct v9fs_session_info *v9ses = sb->s_fs_info; + + inode->i_nlink = 1; + + inode->i_atime.tv_sec = mistat->atime; + inode->i_mtime.tv_sec = mistat->mtime; + inode->i_ctime.tv_sec = mistat->mtime; + + inode->i_uid = -1; + inode->i_gid = -1; + + if (v9ses->extended) { + /* TODO: string to uid mapping via user-space daemon */ + inode->i_uid = mistat->n_uid; + inode->i_gid = mistat->n_gid; + + if (mistat->n_uid == -1) + sscanf(mistat->uid, "%x", &inode->i_uid); + + if (mistat->n_gid == -1) + sscanf(mistat->gid, "%x", &inode->i_gid); + } + + if (inode->i_uid == -1) + inode->i_uid = v9ses->uid; + if (inode->i_gid == -1) + inode->i_gid = v9ses->gid; + + inode->i_mode = p9mode2unixmode(v9ses, mistat->mode); + if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { + char type = 0; + int major = -1; + int minor = -1; + sscanf(mistat->extension, "%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, mistat->extension); + }; + inode->i_rdev = MKDEV(major, minor); + } else + inode->i_rdev = 0; + + inode->i_size = mistat->length; + + inode->i_blksize = sb->s_blocksize; + inode->i_blocks = + (inode->i_size + inode->i_blksize - 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_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) +{ + int retval = -EPERM; + struct v9fs_fid *newfid; + struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); + struct v9fs_fcall *fcall = NULL; + struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); + + dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, + symname); + + if (!mistat) + return -ENOMEM; + + if (!v9ses->extended) { + dprintk(DEBUG_ERROR, "not extended\n"); + goto FreeFcall; + } + + /* issue a create */ + retval = v9fs_create(dir, dentry, S_IFLNK, 0); + if (retval != 0) + goto FreeFcall; + + newfid = v9fs_fid_lookup(dentry, FID_OP); + + /* issue a twstat */ + v9fs_blank_mistat(v9ses, mistat); + strcpy(mistat->data + 1, symname); + mistat->extension = mistat->data + 1; + retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); + if (retval < 0) { + dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", + FCALL_ERROR(fcall)); + goto FreeFcall; + } + + kfree(fcall); + + if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { + dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", + FCALL_ERROR(fcall)); + goto FreeFcall; + } + + d_drop(dentry); /* FID - will this also clunk? */ + + FreeFcall: + kfree(mistat); + kfree(fcall); + + return retval; +} + +/** + * 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_lookup(dentry, FID_OP); + + if (!fid) { + dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n"); + retval = -EBADF; + goto FreeFcall; + } + + if (!v9ses->extended) { + retval = -EBADF; + dprintk(DEBUG_ERROR, "not extended\n"); + goto FreeFcall; + } + + 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) + return -EIO; + + if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) { + retval = -EINVAL; + goto FreeFcall; + } + + /* copy extension buffer into buffer */ + if (strlen(fcall->params.rstat.stat->extension) < buflen) + buflen = strlen(fcall->params.rstat.stat->extension); + + memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1); + + retval = buflen; + + FreeFcall: + kfree(fcall); + + 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 (strlen(link) < buflen) + buflen = strlen(link); + + 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, strlen(link)); + + 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); +} + +/** + * 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 = -EPERM; + struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); + struct v9fs_fcall *fcall = NULL; + struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); + struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_OP); + struct v9fs_fid *newfid = NULL; + char *symname = __getname(); + + dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, + old_dentry->d_name.name); + + if (!v9ses->extended) { + dprintk(DEBUG_ERROR, "not extended\n"); + goto FreeMem; + } + + /* get fid of old_dentry */ + sprintf(symname, "hardlink(%d)\n", oldfid->fid); + + /* issue a create */ + retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0); + if (retval != 0) + goto FreeMem; + + newfid = v9fs_fid_lookup(dentry, FID_OP); + if (!newfid) { + dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n"); + goto FreeMem; + } + + /* issue a twstat */ + v9fs_blank_mistat(v9ses, mistat); + strcpy(mistat->data + 1, symname); + mistat->extension = mistat->data + 1; + retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); + if (retval < 0) { + dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", + FCALL_ERROR(fcall)); + goto FreeMem; + } + + kfree(fcall); + + if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { + dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", + FCALL_ERROR(fcall)); + goto FreeMem; + } + + d_drop(dentry); /* FID - will this also clunk? */ + + kfree(fcall); + fcall = NULL; + + FreeMem: + kfree(mistat); + kfree(fcall); + putname(symname); + 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 = -EPERM; + struct v9fs_fid *newfid; + struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); + struct v9fs_fcall *fcall = NULL; + struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); + char *symname = __getname(); + + 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 (!mistat) + return -ENOMEM; + + if (!new_valid_dev(rdev)) { + retval = -EINVAL; + goto FreeMem; + } + + if (!v9ses->extended) { + dprintk(DEBUG_ERROR, "not extended\n"); + goto FreeMem; + } + + /* issue a create */ + retval = v9fs_create(dir, dentry, mode, 0); + + if (retval != 0) + goto FreeMem; + + newfid = v9fs_fid_lookup(dentry, FID_OP); + if (!newfid) { + dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n"); + retval = -EINVAL; + goto FreeMem; + } + + /* build extension */ + if (S_ISBLK(mode)) + sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev)); + else if (S_ISCHR(mode)) + sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev)); + else if (S_ISFIFO(mode)) + ; /* DO NOTHING */ + else { + retval = -EINVAL; + goto FreeMem; + } + + if (!S_ISFIFO(mode)) { + /* issue a twstat */ + v9fs_blank_mistat(v9ses, mistat); + strcpy(mistat->data + 1, symname); + mistat->extension = mistat->data + 1; + retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); + if (retval < 0) { + dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", + FCALL_ERROR(fcall)); + goto FreeMem; + } + } + + /* need to update dcache so we show up */ + kfree(fcall); + + if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { + dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", + FCALL_ERROR(fcall)); + goto FreeMem; + } + + d_drop(dentry); /* FID - will this also clunk? */ + + FreeMem: + kfree(mistat); + kfree(fcall); + putname(symname); + + return retval; +} + +static 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 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 struct inode_operations v9fs_file_inode_operations = { + .getattr = v9fs_vfs_getattr, + .setattr = v9fs_vfs_setattr, +}; + +static 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, +}; |