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)  * Ceph cache definitions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *  Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *  Written by Milosz Tanski (milosz@adfin.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/ceph/ceph_debug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/fs_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include "super.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include "cache.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) struct ceph_aux_inode {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 	u64 	version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	u64	mtime_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	u64	mtime_nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) struct fscache_netfs ceph_cache_netfs = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	.name		= "ceph",
^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) static DEFINE_MUTEX(ceph_fscache_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) static LIST_HEAD(ceph_fscache_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) struct ceph_fscache_entry {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	struct fscache_cookie *fscache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	size_t uniq_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	/* The following members must be last */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	struct ceph_fsid fsid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	char uniquifier[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) static const struct fscache_cookie_def ceph_fscache_fsid_object_def = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	.name		= "CEPH.fsid",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	.type		= FSCACHE_COOKIE_TYPE_INDEX,
^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) int __init ceph_fscache_register(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	return fscache_register_netfs(&ceph_cache_netfs);
^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 ceph_fscache_unregister(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	fscache_unregister_netfs(&ceph_cache_netfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	const struct ceph_fsid *fsid = &fsc->client->fsid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	const char *fscache_uniq = fsc->mount_options->fscache_uniq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	size_t uniq_len = fscache_uniq ? strlen(fscache_uniq) : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	struct ceph_fscache_entry *ent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	mutex_lock(&ceph_fscache_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	list_for_each_entry(ent, &ceph_fscache_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		if (memcmp(&ent->fsid, fsid, sizeof(*fsid)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		if (ent->uniq_len != uniq_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		if (uniq_len && memcmp(ent->uniquifier, fscache_uniq, uniq_len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		errorfc(fc, "fscache cookie already registered for fsid %pU, use fsc=<uniquifier> option",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		       fsid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		err = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	ent = kzalloc(sizeof(*ent) + uniq_len, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	if (!ent) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	memcpy(&ent->fsid, fsid, sizeof(*fsid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (uniq_len > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		memcpy(&ent->uniquifier, fscache_uniq, uniq_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		ent->uniq_len = uniq_len;
^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) 	fsc->fscache = fscache_acquire_cookie(ceph_cache_netfs.primary_index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 					      &ceph_fscache_fsid_object_def,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 					      &ent->fsid, sizeof(ent->fsid) + uniq_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 					      NULL, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 					      fsc, 0, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	if (fsc->fscache) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		ent->fscache = fsc->fscache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		list_add_tail(&ent->list, &ceph_fscache_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		kfree(ent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		errorfc(fc, "unable to register fscache cookie for fsid %pU",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		       fsid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		/* all other fs ignore this error */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	mutex_unlock(&ceph_fscache_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	return err;
^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) static enum fscache_checkaux ceph_fscache_inode_check_aux(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	void *cookie_netfs_data, const void *data, uint16_t dlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	loff_t object_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	struct ceph_aux_inode aux;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	struct ceph_inode_info* ci = cookie_netfs_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	struct inode* inode = &ci->vfs_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	if (dlen != sizeof(aux) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	    i_size_read(inode) != object_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		return FSCACHE_CHECKAUX_OBSOLETE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	memset(&aux, 0, sizeof(aux));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	aux.version = ci->i_version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	aux.mtime_sec = inode->i_mtime.tv_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	aux.mtime_nsec = inode->i_mtime.tv_nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	if (memcmp(data, &aux, sizeof(aux)) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		return FSCACHE_CHECKAUX_OBSOLETE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	dout("ceph inode 0x%p cached okay\n", ci);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	return FSCACHE_CHECKAUX_OKAY;
^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) static const struct fscache_cookie_def ceph_fscache_inode_object_def = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	.name		= "CEPH.inode",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	.type		= FSCACHE_COOKIE_TYPE_DATAFILE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	.check_aux	= ceph_fscache_inode_check_aux,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) void ceph_fscache_register_inode_cookie(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	struct ceph_inode_info *ci = ceph_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	struct ceph_aux_inode aux;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	/* No caching for filesystem */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	if (!fsc->fscache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	/* Only cache for regular files that are read only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	if (!S_ISREG(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	inode_lock_nested(inode, I_MUTEX_CHILD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	if (!ci->fscache) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		memset(&aux, 0, sizeof(aux));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		aux.version = ci->i_version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		aux.mtime_sec = inode->i_mtime.tv_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		aux.mtime_nsec = inode->i_mtime.tv_nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		ci->fscache = fscache_acquire_cookie(fsc->fscache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 						     &ceph_fscache_inode_object_def,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 						     &ci->i_vino, sizeof(ci->i_vino),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 						     &aux, sizeof(aux),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 						     ci, i_size_read(inode), false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	inode_unlock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	struct fscache_cookie* cookie;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if ((cookie = ci->fscache) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	ci->fscache = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	fscache_uncache_all_inode_pages(cookie, &ci->vfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	fscache_relinquish_cookie(cookie, &ci->i_vino, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) static bool ceph_fscache_can_enable(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	struct inode *inode = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	return !inode_is_open_for_write(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	struct ceph_inode_info *ci = ceph_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (!fscache_cookie_valid(ci->fscache))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	if (inode_is_open_for_write(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		dout("fscache_file_set_cookie %p %p disabling cache\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		     inode, filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		fscache_disable_cookie(ci->fscache, &ci->i_vino, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		fscache_uncache_all_inode_pages(ci->fscache, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		fscache_enable_cookie(ci->fscache, &ci->i_vino, i_size_read(inode),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 				      ceph_fscache_can_enable, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		if (fscache_cookie_enabled(ci->fscache)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 			dout("fscache_file_set_cookie %p %p enabling cache\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			     inode, filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) static void ceph_readpage_from_fscache_complete(struct page *page, void *data, int error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) static inline bool cache_valid(struct ceph_inode_info *ci)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	return ci->i_fscache_gen == ci->i_rdcache_gen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) /* Atempt to read from the fscache,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)  * This function is called from the readpage_nounlock context. DO NOT attempt to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)  * unlock the page here (or in the callback).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) int ceph_readpage_from_fscache(struct inode *inode, struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	struct ceph_inode_info *ci = ceph_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	if (!cache_valid(ci))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	ret = fscache_read_or_alloc_page(ci->fscache, page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 					 ceph_readpage_from_fscache_complete, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 					 GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	switch (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		case 0: /* Page found */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 			dout("page read submitted\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		case -ENOBUFS: /* Pages were not found, and can't be */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		case -ENODATA: /* Pages were not found */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 			dout("page/inode not in cache\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 			dout("%s: unknown error ret = %i\n", __func__, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 			return ret;
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) int ceph_readpages_from_fscache(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 				  struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 				  struct list_head *pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 				  unsigned *nr_pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	struct ceph_inode_info *ci = ceph_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	if (!cache_valid(ci))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	ret = fscache_read_or_alloc_pages(ci->fscache, mapping, pages, nr_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 					  ceph_readpage_from_fscache_complete,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 					  NULL, mapping_gfp_mask(mapping));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	switch (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		case 0: /* All pages found */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 			dout("all-page read submitted\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		case -ENOBUFS: /* Some pages were not found, and can't be */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		case -ENODATA: /* some pages were not found */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 			dout("page/inode not in cache\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 			dout("%s: unknown error ret = %i\n", __func__, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) void ceph_readpage_to_fscache(struct inode *inode, struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	struct ceph_inode_info *ci = ceph_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	if (!PageFsCache(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	if (!cache_valid(ci))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	ret = fscache_write_page(ci->fscache, page, i_size_read(inode),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 				 GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		 fscache_uncache_page(ci->fscache, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) void ceph_invalidate_fscache_page(struct inode* inode, struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	struct ceph_inode_info *ci = ceph_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	if (!PageFsCache(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	fscache_wait_on_page_write(ci->fscache, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	fscache_uncache_page(ci->fscache, page);
^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) void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	if (fscache_cookie_valid(fsc->fscache)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		struct ceph_fscache_entry *ent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		bool found = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		mutex_lock(&ceph_fscache_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		list_for_each_entry(ent, &ceph_fscache_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 			if (ent->fscache == fsc->fscache) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 				list_del(&ent->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 				kfree(ent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 				found = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		WARN_ON_ONCE(!found);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		mutex_unlock(&ceph_fscache_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		__fscache_relinquish_cookie(fsc->fscache, NULL, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	fsc->fscache = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)  * caller should hold CEPH_CAP_FILE_{RD,CACHE}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) void ceph_fscache_revalidate_cookie(struct ceph_inode_info *ci)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	if (cache_valid(ci))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	/* resue i_truncate_mutex. There should be no pending
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	 * truncate while the caller holds CEPH_CAP_FILE_RD */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	mutex_lock(&ci->i_truncate_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	if (!cache_valid(ci)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 		if (fscache_check_consistency(ci->fscache, &ci->i_vino))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 			fscache_invalidate(ci->fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		spin_lock(&ci->i_ceph_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		ci->i_fscache_gen = ci->i_rdcache_gen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		spin_unlock(&ci->i_ceph_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	mutex_unlock(&ci->i_truncate_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) }