Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *  linux/fs/9p/vfs_super.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * This file contians superblock ops for 9P2000. It is intended that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * you mount this file system on directories.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/idr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/statfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/magic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <net/9p/9p.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <net/9p/client.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include "v9fs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include "v9fs_vfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include "fid.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include "xattr.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include "acl.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  * v9fs_set_super - set the superblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  * @s: super block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  * @data: file system specific data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static int v9fs_set_super(struct super_block *s, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	s->s_fs_info = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	return set_anon_super(s, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  * v9fs_fill_super - populate superblock with info
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  * @sb: superblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  * @v9ses: session information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55)  * @flags: flags propagated from v9fs_mount()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	sb->s_maxbytes = MAX_LFS_FILESIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	sb->s_blocksize = 1 << sb->s_blocksize_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	sb->s_magic = V9FS_MAGIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	if (v9fs_proto_dotl(v9ses)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		sb->s_op = &v9fs_super_ops_dotl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		sb->s_xattr = v9fs_xattr_handlers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		sb->s_op = &v9fs_super_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		sb->s_time_max = U32_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	sb->s_time_min = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	ret = super_setup_bdi(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (!v9ses->cache) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		sb->s_bdi->ra_pages = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		sb->s_bdi->io_pages = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	sb->s_flags |= SB_ACTIVE | SB_DIRSYNC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	if (!v9ses->cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		sb->s_flags |= SB_SYNCHRONOUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) #ifdef CONFIG_9P_FS_POSIX_ACL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		sb->s_flags |= SB_POSIXACL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)  * v9fs_mount - mount a superblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)  * @fs_type: file system type
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)  * @flags: mount flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)  * @dev_name: device name that was mounted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)  * @data: mount options
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		       const char *dev_name, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	struct super_block *sb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	struct inode *inode = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	struct dentry *root = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	struct v9fs_session_info *v9ses = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	umode_t mode = S_IRWXUGO | S_ISVTX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	struct p9_fid *fid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	int retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	p9_debug(P9_DEBUG_VFS, "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	if (!v9ses)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	fid = v9fs_session_init(v9ses, dev_name, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	if (IS_ERR(fid)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		retval = PTR_ERR(fid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		goto free_session;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	sb = sget(fs_type, NULL, v9fs_set_super, flags, v9ses);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	if (IS_ERR(sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		retval = PTR_ERR(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		goto clunk_fid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	retval = v9fs_fill_super(sb, v9ses, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		goto release_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		sb->s_d_op = &v9fs_cached_dentry_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		sb->s_d_op = &v9fs_dentry_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	inode = v9fs_get_inode(sb, S_IFDIR | mode, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	if (IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		retval = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		goto release_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	root = d_make_root(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	if (!root) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		retval = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		goto release_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	sb->s_root = root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	if (v9fs_proto_dotl(v9ses)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		struct p9_stat_dotl *st = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		if (IS_ERR(st)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 			retval = PTR_ERR(st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 			goto release_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		v9fs_stat2inode_dotl(st, d_inode(root), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		kfree(st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		struct p9_wstat *st = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		st = p9_client_stat(fid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		if (IS_ERR(st)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 			retval = PTR_ERR(st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 			goto release_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		v9fs_stat2inode(st, d_inode(root), sb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		p9stat_free(st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		kfree(st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	retval = v9fs_get_acl(inode, fid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		goto release_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	v9fs_fid_add(root, fid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	return dget(sb->s_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) clunk_fid:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	p9_client_clunk(fid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	v9fs_session_close(v9ses);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) free_session:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	kfree(v9ses);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	return ERR_PTR(retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) release_sb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	 * we will do the session_close and root dentry release
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	 * in the below call. But we need to clunk fid, because we haven't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	 * attached the fid to dentry so it won't get clunked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	 * automatically.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	p9_client_clunk(fid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	deactivate_locked_super(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	return ERR_PTR(retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)  * v9fs_kill_super - Kill Superblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)  * @s: superblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static void v9fs_kill_super(struct super_block *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	struct v9fs_session_info *v9ses = s->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	p9_debug(P9_DEBUG_VFS, " %p\n", s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	kill_anon_super(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	v9fs_session_cancel(v9ses);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	v9fs_session_close(v9ses);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	kfree(v9ses);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	s->s_fs_info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	p9_debug(P9_DEBUG_VFS, "exiting kill_super\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) v9fs_umount_begin(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	struct v9fs_session_info *v9ses;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	v9ses = sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	v9fs_session_begin_cancel(v9ses);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	struct v9fs_session_info *v9ses;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	struct p9_fid *fid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	struct p9_rstatfs rs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	fid = v9fs_fid_lookup(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	if (IS_ERR(fid)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		res = PTR_ERR(fid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	v9ses = v9fs_dentry2v9ses(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	if (v9fs_proto_dotl(v9ses)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		res = p9_client_statfs(fid, &rs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		if (res == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 			buf->f_type = rs.type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 			buf->f_bsize = rs.bsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 			buf->f_blocks = rs.blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			buf->f_bfree = rs.bfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 			buf->f_bavail = rs.bavail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 			buf->f_files = rs.files;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			buf->f_ffree = rs.ffree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 			buf->f_fsid = u64_to_fsid(rs.fsid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 			buf->f_namelen = rs.namelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		if (res != -ENOSYS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 			goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	res = simple_statfs(dentry, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) static int v9fs_drop_inode(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	struct v9fs_session_info *v9ses;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	v9ses = v9fs_inode2v9ses(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		return generic_drop_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	 * in case of non cached mode always drop the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	 * the inode because we want the inode attribute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	 * to always match that on the server.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) static int v9fs_write_inode(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 			    struct writeback_control *wbc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	struct p9_wstat wstat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	struct v9fs_inode *v9inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	 * send an fsync request to server irrespective of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	 * wbc->sync_mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	v9inode = V9FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	if (!v9inode->writeback_fid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	v9fs_blank_wstat(&wstat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	ret = p9_client_wstat(v9inode->writeback_fid, &wstat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) static int v9fs_write_inode_dotl(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 				 struct writeback_control *wbc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	struct v9fs_inode *v9inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	 * send an fsync request to server irrespective of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	 * wbc->sync_mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	v9inode = V9FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	p9_debug(P9_DEBUG_VFS, "%s: inode %p, writeback_fid %p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		 __func__, inode, v9inode->writeback_fid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	if (!v9inode->writeback_fid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	ret = p9_client_fsync(v9inode->writeback_fid, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) static const struct super_operations v9fs_super_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	.alloc_inode = v9fs_alloc_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	.free_inode = v9fs_free_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	.statfs = simple_statfs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	.evict_inode = v9fs_evict_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	.show_options = v9fs_show_options,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	.umount_begin = v9fs_umount_begin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	.write_inode = v9fs_write_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) static const struct super_operations v9fs_super_ops_dotl = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	.alloc_inode = v9fs_alloc_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	.free_inode = v9fs_free_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	.statfs = v9fs_statfs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	.drop_inode = v9fs_drop_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	.evict_inode = v9fs_evict_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	.show_options = v9fs_show_options,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	.umount_begin = v9fs_umount_begin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	.write_inode = v9fs_write_inode_dotl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) struct file_system_type v9fs_fs_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	.name = "9p",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	.mount = v9fs_mount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	.kill_sb = v9fs_kill_super,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	.owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	.fs_flags = FS_RENAME_DOES_D_MOVE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) MODULE_ALIAS_FS("9p");