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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id n72sm97432pfd.8.2021.06.15.14.21.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Jun 2021 14:21:24 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Christoph Hellwig , Al Viro , gmpy.liaowx@gmail.com, Anton Vorontsov , Colin Cross , Tony Luck , Jonathan Corbet , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , linux-doc@vger.kernel.org, linux-mtd@lists.infradead.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v2 3/4] pstore/blk: Include zone in pstore_device_info Date: Tue, 15 Jun 2021 14:21:20 -0700 Message-Id: <20210615212121.1200820-4-keescook@chromium.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210615212121.1200820-1-keescook@chromium.org> References: <20210615212121.1200820-1-keescook@chromium.org> MIME-Version: 1.0 X-Patch-Hashes: v=1; h=sha256; g=efcf5526fe13766bd98acae29e0115d24b07d210; i=OzHp+/X5c8B1qT+xdnUXKoWwSY89uY95adXbT6Ztj74=; m=WOqt0d4utZlTaiUKpB0qyaFAJBWPe3VuJCNaOBLEDLw=; p=GZLcj+Pw6pTB7TcSUO0TjvUzZzwmL6Y5LQQOOEKli3E= X-Patch-Sig: m=pgp; i=keescook@chromium.org; s=0x0x8972F4DFDC6DC026; b=iQIzBAABCgAdFiEEpcP2jyKd1g9yPm4TiXL039xtwCYFAmDJGdAACgkQiXL039xtwCYcLQ/9Fvd Nj3Ll/zeOLGt4PGGxze7JbJepy6cH2wDJQu1BGatCL+4bWg4QpvEe+csymzkSrAQMNFJ0AQdds7V4 T03C0ur2CxGfQHjbXlsbY3fy+kXqQrpPhsy9lacKCIgVqyhHsneOQy5xinFCW8zAetopb+NA+1Z7E P3nl32yC7gccP3/r1ssROCOI2WECYoalwccWeJrVgPgqmf35b0DrGeLWQEQo5t4SwS4B70WW4vcRM E/Po3vNo9kJuV97hOWqHZD+XTyZY9/CQ0uODLRHOJbKUoLHAa3FJhLuLJm+uymdKNBhJsC8pQhltX fMK5pC1nt7djnQSf/HgiqoOYrv5xGyu10iNJodPdzqZ23txGygAOzNQlrguzMD3g7p1YZSBgtJSSL vl6D1uJiwOk4eaoAmciNSJRJc5K6zuLkpYj8zVoz5iOtLixKuI+EZtWC9GF2Zeru4MmoGSNNx6qow Qxeu2bjjjP5W9oWn6Nh0zUmf+foxqIeO9adkx2Eyzr83Uo6hgDyABe99QNrsIaOXg+T6nY7AWIC1V ysKqB+ppSsmq2R5RNUMk/neYiE5hDXOatnAVEqcDpBsqVQis/TYgYa0BB9kNEoLMuQ8gng+8q2M8g 1b2AifpUOmoQQsNqq8F71g3E7qFwMgIRNhi+csIJIkMJB42qKu6bwaxYjG5CWsBM= Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Information was redundant between struct pstore_zone_info and struct pstore_device_info. Use struct pstore_zone_info, with member name "zone". Additionally untangle the logic for the "best effort" block device instance. Signed-off-by: Kees Cook --- drivers/mtd/mtdpstore.c | 10 +-- fs/pstore/blk.c | 141 ++++++++++++++++++------------------- include/linux/pstore_blk.h | 27 +------ 3 files changed, 75 insertions(+), 103 deletions(-) diff --git a/drivers/mtd/mtdpstore.c b/drivers/mtd/mtdpstore.c index a3ae8778f6a9..e13d42c0acb0 100644 --- a/drivers/mtd/mtdpstore.c +++ b/drivers/mtd/mtdpstore.c @@ -423,13 +423,13 @@ static void mtdpstore_notify_add(struct mtd_info *mtd) longcnt = BITS_TO_LONGS(div_u64(mtd->size, mtd->erasesize)); cxt->badmap = kcalloc(longcnt, sizeof(long), GFP_KERNEL); - cxt->dev.total_size = mtd->size; /* just support dmesg right now */ cxt->dev.flags = PSTORE_FLAGS_DMESG; - cxt->dev.read = mtdpstore_read; - cxt->dev.write = mtdpstore_write; - cxt->dev.erase = mtdpstore_erase; - cxt->dev.panic_write = mtdpstore_panic_write; + cxt->dev.zone.read = mtdpstore_read; + cxt->dev.zone.write = mtdpstore_write; + cxt->dev.zone.erase = mtdpstore_erase; + cxt->dev.zone.panic_write = mtdpstore_panic_write; + cxt->dev.zone.total_size = mtd->size; ret = register_pstore_device(&cxt->dev); if (ret) { diff --git a/fs/pstore/blk.c b/fs/pstore/blk.c index 8f5bd656cc2d..e5ed118683b1 100644 --- a/fs/pstore/blk.c +++ b/fs/pstore/blk.c @@ -92,7 +92,7 @@ MODULE_PARM_DESC(blkdev, "block device for pstore storage"); */ static DEFINE_MUTEX(pstore_blk_lock); static struct file *psblk_file; -static struct pstore_zone_info *pstore_zone_info; +static struct pstore_device_info *pstore_device_info; #define check_size(name, alignsize) ({ \ long _##name_ = (name); \ @@ -105,68 +105,60 @@ static struct pstore_zone_info *pstore_zone_info; _##name_; \ }) +#define verify_size(name, alignsize, enabled) { \ + long _##name_; \ + if (enabled) \ + _##name_ = check_size(name, alignsize); \ + else \ + _##name_ = 0; \ + /* synchronize visible module parameters to result. */ \ + name = _##name_ / 1024; \ + dev->zone.name = _##name_; \ + } + static int __register_pstore_device(struct pstore_device_info *dev) { int ret; lockdep_assert_held(&pstore_blk_lock); - if (!dev || !dev->total_size || !dev->read || !dev->write) { + if (!dev || !dev->zone.total_size || !dev->zone.read || !dev->zone.write) { if (!dev) - pr_err("NULL device info\n"); + pr_err("NULL pstore_device_info\n"); else { - if (!dev->total_size) + if (!dev->zone.total_size) pr_err("zero sized device\n"); - if (!dev->read) + if (!dev->zone.read) pr_err("no read handler for device\n"); - if (!dev->write) + if (!dev->zone.write) pr_err("no write handler for device\n"); } return -EINVAL; } /* someone already registered before */ - if (pstore_zone_info) + if (pstore_device_info) return -EBUSY; - pstore_zone_info = kzalloc(sizeof(struct pstore_zone_info), GFP_KERNEL); - if (!pstore_zone_info) - return -ENOMEM; - /* zero means not limit on which backends to attempt to store. */ if (!dev->flags) dev->flags = UINT_MAX; -#define verify_size(name, alignsize, enabled) { \ - long _##name_; \ - if (enabled) \ - _##name_ = check_size(name, alignsize); \ - else \ - _##name_ = 0; \ - name = _##name_ / 1024; \ - pstore_zone_info->name = _##name_; \ - } - + /* Copy in module parameters. */ verify_size(kmsg_size, 4096, dev->flags & PSTORE_FLAGS_DMESG); verify_size(pmsg_size, 4096, dev->flags & PSTORE_FLAGS_PMSG); verify_size(console_size, 4096, dev->flags & PSTORE_FLAGS_CONSOLE); verify_size(ftrace_size, 4096, dev->flags & PSTORE_FLAGS_FTRACE); -#undef verify_size - - pstore_zone_info->total_size = dev->total_size; - pstore_zone_info->max_reason = max_reason; - pstore_zone_info->read = dev->read; - pstore_zone_info->write = dev->write; - pstore_zone_info->erase = dev->erase; - pstore_zone_info->panic_write = dev->panic_write; - pstore_zone_info->name = KBUILD_MODNAME; - pstore_zone_info->owner = THIS_MODULE; - - ret = register_pstore_zone(pstore_zone_info); - if (ret) { - kfree(pstore_zone_info); - pstore_zone_info = NULL; - } + dev->zone.max_reason = max_reason; + + /* Initialize required zone ownership details. */ + dev->zone.name = KBUILD_MODNAME; + dev->zone.owner = THIS_MODULE; + + ret = register_pstore_zone(&dev->zone); + if (ret == 0) + pstore_device_info = dev; + return ret; } /** @@ -193,10 +185,9 @@ EXPORT_SYMBOL_GPL(register_pstore_device); static void __unregister_pstore_device(struct pstore_device_info *dev) { lockdep_assert_held(&pstore_blk_lock); - if (pstore_zone_info && pstore_zone_info->read == dev->read) { - unregister_pstore_zone(pstore_zone_info); - kfree(pstore_zone_info); - pstore_zone_info = NULL; + if (pstore_device_info && pstore_device_info == dev) { + unregister_pstore_zone(&dev->zone); + pstore_device_info = NULL; } } @@ -230,12 +221,9 @@ static ssize_t psblk_generic_blk_write(const char *buf, size_t bytes, /* * This takes its configuration only from the module parameters now. */ -static int __register_pstore_blk(const char *devpath) +static int __register_pstore_blk(struct pstore_device_info *dev, + const char *devpath) { - struct pstore_device_info dev = { - .read = psblk_generic_blk_read, - .write = psblk_generic_blk_write, - }; int ret = -ENODEV; lockdep_assert_held(&pstore_blk_lock); @@ -252,9 +240,9 @@ static int __register_pstore_blk(const char *devpath) goto err_fput; } - dev.total_size = i_size_read(I_BDEV(psblk_file->f_mapping->host)->bd_inode); + dev->zone.total_size = i_size_read(I_BDEV(psblk_file->f_mapping->host)->bd_inode); - ret = __register_pstore_device(&dev); + ret = __register_pstore_device(dev); if (ret) goto err_fput; @@ -268,18 +256,6 @@ static int __register_pstore_blk(const char *devpath) return ret; } -static void __unregister_pstore_blk(struct file *device) -{ - struct pstore_device_info dev = { .read = psblk_generic_blk_read }; - - lockdep_assert_held(&pstore_blk_lock); - if (psblk_file && psblk_file == device) { - __unregister_pstore_device(&dev); - fput(psblk_file); - psblk_file = NULL; - } -} - /* get information of pstore/blk */ int pstore_blk_get_config(struct pstore_blk_config *info) { @@ -329,13 +305,27 @@ static int __init pstore_blk_init(void) int ret = 0; mutex_lock(&pstore_blk_lock); - if (!pstore_zone_info && best_effort && blkdev[0]) { - ret = __register_pstore_blk(early_boot_devpath(blkdev)); - if (ret == 0 && pstore_zone_info) - pr_info("attached %s:%s (%zu) (no dedicated panic_write!)\n", - pstore_zone_info->name, blkdev, - pstore_zone_info->total_size); + if (!pstore_device_info && best_effort && blkdev[0]) { + struct pstore_device_info *best_effort_dev; + + best_effort_dev = kzalloc(sizeof(*best_effort_dev), GFP_KERNEL); + if (!best_effort) { + ret = -ENOMEM; + goto unlock; + } + best_effort_dev->zone.read = psblk_generic_blk_read; + best_effort_dev->zone.write = psblk_generic_blk_write; + + ret = __register_pstore_blk(best_effort_dev, + early_boot_devpath(blkdev)); + if (ret) + kfree(best_effort_dev); + else + pr_info("attached %s (%zu) (no dedicated panic_write!)\n", + blkdev, best_effort_dev->zone.total_size); } + +unlock: mutex_unlock(&pstore_blk_lock); return ret; @@ -345,15 +335,18 @@ late_initcall(pstore_blk_init); static void __exit pstore_blk_exit(void) { mutex_lock(&pstore_blk_lock); - if (psblk_file) - __unregister_pstore_blk(psblk_file); - else { - struct pstore_device_info dev = { }; - - if (pstore_zone_info) - dev.read = pstore_zone_info->read; - __unregister_pstore_device(&dev); + /* Unregister and free the best_effort device. */ + if (psblk_file) { + struct pstore_device_info *dev = pstore_device_info; + + __unregister_pstore_device(dev); + kfree(dev); + fput(psblk_file); + psblk_file = NULL; } + /* If we've been asked to unload, unregister any registered device. */ + if (pstore_device_info) + __unregister_pstore_device(pstore_device_info); mutex_unlock(&pstore_blk_lock); } module_exit(pstore_blk_exit); diff --git a/include/linux/pstore_blk.h b/include/linux/pstore_blk.h index 99564f93d774..924ca07aafbd 100644 --- a/include/linux/pstore_blk.h +++ b/include/linux/pstore_blk.h @@ -10,36 +10,15 @@ /** * struct pstore_device_info - back-end pstore/blk driver structure. * - * @total_size: The total size in bytes pstore/blk can use. It must be greater - * than 4096 and be multiple of 4096. * @flags: Refer to macro starting with PSTORE_FLAGS defined in * linux/pstore.h. It means what front-ends this device support. * Zero means all backends for compatible. - * @read: The general read operation. Both of the function parameters - * @size and @offset are relative value to bock device (not the - * whole disk). - * On success, the number of bytes should be returned, others - * means error. - * @write: The same as @read, but the following error number: - * -EBUSY means try to write again later. - * -ENOMSG means to try next zone. - * @erase: The general erase operation for device with special removing - * job. Both of the function parameters @size and @offset are - * relative value to storage. - * Return 0 on success and others on failure. - * @panic_write:The write operation only used for panic case. It's optional - * if you do not care panic log. The parameters are relative - * value to storage. - * On success, the number of bytes should be returned, others - * excluding -ENOMSG mean error. -ENOMSG means to try next zone. + * @zone: The struct pstore_zone_info details. + * */ struct pstore_device_info { - unsigned long total_size; unsigned int flags; - pstore_zone_read_op read; - pstore_zone_write_op write; - pstore_zone_erase_op erase; - pstore_zone_write_op panic_write; + struct pstore_zone_info zone; }; int register_pstore_device(struct pstore_device_info *dev);