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)  * V9FS cache definitions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *  Copyright (C) 2009 by Abhishek Kulkarni <adkulkar@umail.iu.edu>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <net/9p/9p.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include "v9fs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include "cache.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #define CACHETAG_LEN  11
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) struct fscache_netfs v9fs_cache_netfs = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	.name 		= "9p",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	.version 	= 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  * v9fs_random_cachetag - Generate a random tag to be associated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  *			  with a new cache session.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  * The value of jiffies is used for a fairly randomly cache tag.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) static
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) int v9fs_random_cachetag(struct v9fs_session_info *v9ses)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	v9ses->cachetag = kmalloc(CACHETAG_LEN, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	if (!v9ses->cachetag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	return scnprintf(v9ses->cachetag, CACHETAG_LEN, "%lu", jiffies);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) const struct fscache_cookie_def v9fs_cache_session_index_def = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	.name		= "9P.session",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	.type		= FSCACHE_COOKIE_TYPE_INDEX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	/* If no cache session tag was specified, we generate a random one. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	if (!v9ses->cachetag) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		if (v9fs_random_cachetag(v9ses) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 			v9ses->fscache = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 			kfree(v9ses->cachetag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 			v9ses->cachetag = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 			return;
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	v9ses->fscache = fscache_acquire_cookie(v9fs_cache_netfs.primary_index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 						&v9fs_cache_session_index_def,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 						v9ses->cachetag,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 						strlen(v9ses->cachetag),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 						NULL, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 						v9ses, 0, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	p9_debug(P9_DEBUG_FSC, "session %p get cookie %p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		 v9ses, v9ses->fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) void v9fs_cache_session_put_cookie(struct v9fs_session_info *v9ses)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	p9_debug(P9_DEBUG_FSC, "session %p put cookie %p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		 v9ses, v9ses->fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	fscache_relinquish_cookie(v9ses->fscache, NULL, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	v9ses->fscache = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) static enum
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) fscache_checkaux v9fs_cache_inode_check_aux(void *cookie_netfs_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 					    const void *buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 					    uint16_t buflen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 					    loff_t object_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	const struct v9fs_inode *v9inode = cookie_netfs_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	if (buflen != sizeof(v9inode->qid.version))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		return FSCACHE_CHECKAUX_OBSOLETE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	if (memcmp(buffer, &v9inode->qid.version,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		   sizeof(v9inode->qid.version)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		return FSCACHE_CHECKAUX_OBSOLETE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	return FSCACHE_CHECKAUX_OKAY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) const struct fscache_cookie_def v9fs_cache_inode_index_def = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	.name		= "9p.inode",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	.type		= FSCACHE_COOKIE_TYPE_DATAFILE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	.check_aux	= v9fs_cache_inode_check_aux,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) void v9fs_cache_inode_get_cookie(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	struct v9fs_inode *v9inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	struct v9fs_session_info *v9ses;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	if (!S_ISREG(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	v9inode = V9FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	if (v9inode->fscache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	v9ses = v9fs_inode2v9ses(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	v9inode->fscache = fscache_acquire_cookie(v9ses->fscache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 						  &v9fs_cache_inode_index_def,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 						  &v9inode->qid.path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 						  sizeof(v9inode->qid.path),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 						  &v9inode->qid.version,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 						  sizeof(v9inode->qid.version),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 						  v9inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 						  i_size_read(&v9inode->vfs_inode),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 						  true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	p9_debug(P9_DEBUG_FSC, "inode %p get cookie %p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		 inode, v9inode->fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) void v9fs_cache_inode_put_cookie(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	struct v9fs_inode *v9inode = V9FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	if (!v9inode->fscache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	p9_debug(P9_DEBUG_FSC, "inode %p put cookie %p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		 inode, v9inode->fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	fscache_relinquish_cookie(v9inode->fscache, &v9inode->qid.version,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 				  false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	v9inode->fscache = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) void v9fs_cache_inode_flush_cookie(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	struct v9fs_inode *v9inode = V9FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	if (!v9inode->fscache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	p9_debug(P9_DEBUG_FSC, "inode %p flush cookie %p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		 inode, v9inode->fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	fscache_relinquish_cookie(v9inode->fscache, NULL, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	v9inode->fscache = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) void v9fs_cache_inode_set_cookie(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	struct v9fs_inode *v9inode = V9FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	if (!v9inode->fscache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	mutex_lock(&v9inode->fscache_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		v9fs_cache_inode_flush_cookie(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		v9fs_cache_inode_get_cookie(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	mutex_unlock(&v9inode->fscache_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) void v9fs_cache_inode_reset_cookie(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	struct v9fs_inode *v9inode = V9FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	struct v9fs_session_info *v9ses;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	struct fscache_cookie *old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	if (!v9inode->fscache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	old = v9inode->fscache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	mutex_lock(&v9inode->fscache_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	fscache_relinquish_cookie(v9inode->fscache, NULL, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	v9ses = v9fs_inode2v9ses(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	v9inode->fscache = fscache_acquire_cookie(v9ses->fscache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 						  &v9fs_cache_inode_index_def,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 						  &v9inode->qid.path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 						  sizeof(v9inode->qid.path),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 						  &v9inode->qid.version,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 						  sizeof(v9inode->qid.version),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 						  v9inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 						  i_size_read(&v9inode->vfs_inode),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 						  true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	p9_debug(P9_DEBUG_FSC, "inode %p revalidating cookie old %p new %p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		 inode, old, v9inode->fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	mutex_unlock(&v9inode->fscache_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) int __v9fs_fscache_release_page(struct page *page, gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	struct inode *inode = page->mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	struct v9fs_inode *v9inode = V9FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	BUG_ON(!v9inode->fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	return fscache_maybe_release_page(v9inode->fscache, page, gfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) void __v9fs_fscache_invalidate_page(struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	struct inode *inode = page->mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	struct v9fs_inode *v9inode = V9FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	BUG_ON(!v9inode->fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (PageFsCache(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		fscache_wait_on_page_write(v9inode->fscache, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		BUG_ON(!PageLocked(page));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		fscache_uncache_page(v9inode->fscache, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) static void v9fs_vfs_readpage_complete(struct page *page, void *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 				       int error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)  * __v9fs_readpage_from_fscache - read a page from cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)  * Returns 0 if the pages are in cache and a BIO is submitted,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)  * 1 if the pages are not in cache and -error otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) int __v9fs_readpage_from_fscache(struct inode *inode, struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	const struct v9fs_inode *v9inode = V9FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	p9_debug(P9_DEBUG_FSC, "inode %p page %p\n", inode, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (!v9inode->fscache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	ret = fscache_read_or_alloc_page(v9inode->fscache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 					 page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 					 v9fs_vfs_readpage_complete,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 					 NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 					 GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	switch (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	case -ENOBUFS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	case -ENODATA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		p9_debug(P9_DEBUG_FSC, "page/inode not in cache %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		p9_debug(P9_DEBUG_FSC, "BIO submitted\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		p9_debug(P9_DEBUG_FSC, "ret %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)  * __v9fs_readpages_from_fscache - read multiple pages from cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)  * Returns 0 if the pages are in cache and a BIO is submitted,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)  * 1 if the pages are not in cache and -error otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) int __v9fs_readpages_from_fscache(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 				  struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 				  struct list_head *pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 				  unsigned *nr_pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	const struct v9fs_inode *v9inode = V9FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	p9_debug(P9_DEBUG_FSC, "inode %p pages %u\n", inode, *nr_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	if (!v9inode->fscache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	ret = fscache_read_or_alloc_pages(v9inode->fscache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 					  mapping, pages, nr_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 					  v9fs_vfs_readpage_complete,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 					  NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 					  mapping_gfp_mask(mapping));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	switch (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	case -ENOBUFS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	case -ENODATA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		p9_debug(P9_DEBUG_FSC, "pages/inodes not in cache %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		BUG_ON(!list_empty(pages));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		BUG_ON(*nr_pages != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		p9_debug(P9_DEBUG_FSC, "BIO submitted\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		p9_debug(P9_DEBUG_FSC, "ret %d\n", ret);
^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) }
^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)  * __v9fs_readpage_to_fscache - write a page to the cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) void __v9fs_readpage_to_fscache(struct inode *inode, struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	const struct v9fs_inode *v9inode = V9FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	p9_debug(P9_DEBUG_FSC, "inode %p page %p\n", inode, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	ret = fscache_write_page(v9inode->fscache, page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 				 i_size_read(&v9inode->vfs_inode), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	p9_debug(P9_DEBUG_FSC, "ret =  %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	if (ret != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		v9fs_uncache_page(inode, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)  * wait for a page to complete writing to the cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) void __v9fs_fscache_wait_on_page_write(struct inode *inode, struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	const struct v9fs_inode *v9inode = V9FS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	p9_debug(P9_DEBUG_FSC, "inode %p page %p\n", inode, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	if (PageFsCache(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		fscache_wait_on_page_write(v9inode->fscache, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) }