From: Rodrigo Freire <rfreire@redhat.com> To: "Jörn Engel" <joern@logfs.org> Cc: dwmw2@infradead.org, Felix Fietkau <nbd@openwrt.org>, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, Herton Krzesinski <hkrzesin@redhat.com> Subject: [RESEND PATCH V2] mtd: block2mtd: Present block2mtd timely on boot time Date: Thu, 9 Oct 2014 11:07:31 -0400 (EDT) [thread overview] Message-ID: <515696553.1577613.1412867251670.JavaMail.zimbra@redhat.com> (raw) In-Reply-To: <1807144344.40128259.1410985683342.JavaMail.zimbra@redhat.com> From: Felix Fietkau <nbd@openwrt.org> mtd: block2mtd: Ensure that block2mtd is presented in a timely fashion Currently, a block MTD device is not presented to the system on time, in order to start mounting the filesystems. This patch ensures that block2mtd is presented at the right time, so filesystems can be mounted on boot time. This issue was seen on BCM2835 (Raspberry Pi) systems when mounting JFFS2 block2mtd filesystems. This patchset also adds a MTD device name and a timeout option to the driver. Original patchset: https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.12/440-block2mtd_init.patch?rev=40444 https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.12/441-block2mtd_probe.patch?rev=40444 Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: Rodrigo Freire <rfreire@redhat.com> Signed-off-by: Herton Krzesinski <herton@redhat.com> --- V2: Uses kstrdup, removed PAGE_MASK. --- a/drivers/mtd/devices/block2mtd.c 2014-09-16 21:38:12.543952627 -0300 +++ b/drivers/mtd/devices/block2mtd.c 2014-09-17 17:43:21.424944394 -0300 @@ -9,7 +9,15 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +/* +* When the first attempt at device initialization fails, we may need to +* wait a little bit and retry. This timeout, by default 3 seconds, gives +* device time to start up. Required on BCM2708 and a few other chipsets. +*/ +#define MTD_DEFAULT_TIMEOUT 3 + #include <linux/module.h> +#include <linux/delay.h> #include <linux/fs.h> #include <linux/blkdev.h> #include <linux/bio.h> @@ -17,6 +25,7 @@ #include <linux/list.h> #include <linux/init.h> #include <linux/mtd/mtd.h> +#include <linux/mtd/partitions.h> #include <linux/mutex.h> #include <linux/mount.h> #include <linux/slab.h> @@ -209,12 +218,14 @@ static void block2mtd_free_device(struct } -static struct block2mtd_dev *add_device(char *devname, int erase_size) +static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname, int timeout) { const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL; - struct block_device *bdev; + struct block_device *bdev = ERR_PTR(-ENODEV); struct block2mtd_dev *dev; + struct mtd_partition *part; char *name; + int i; if (!devname) return NULL; @@ -225,15 +236,28 @@ static struct block2mtd_dev *add_device( /* Get a handle on the device */ bdev = blkdev_get_by_path(devname, mode, dev); -#ifndef MODULE - if (IS_ERR(bdev)) { - /* We might not have rootfs mounted at this point. Try - to resolve the device name by other means. */ - - dev_t devt = name_to_dev_t(devname); - if (devt) - bdev = blkdev_get_by_dev(devt, mode, dev); +#ifndef MODULE +/* +* We might not have the root device mounted at this point. +* Try to resolve the device name by other means. +*/ + for (i = 0; IS_ERR(bdev) && i <= timeout; i++) { + dev_t devt; + + if (i) + /* + * Calling wait_for_device_probe in the first loop + * was not enough, sleep for a bit in subsequent + * go-arounds. + */ + msleep(1000); + wait_for_device_probe(); + + devt = name_to_dev_t(devname); + if (!devt) + continue; + bdev = blkdev_get_by_dev(devt, mode, dev); } #endif @@ -257,13 +281,14 @@ static struct block2mtd_dev *add_device( /* Setup the MTD structure */ /* make the name contain the block device in */ - name = kasprintf(GFP_KERNEL, "block2mtd: %s", devname); + if (!mtdname) + mtdname = devname; + name = kstrdup (mtdname, GFP_KERNEL); if (!name) goto err_destroy_mutex; dev->mtd.name = name; - - dev->mtd.size = dev->blkdev->bd_inode->i_size & PAGE_MASK; + dev->mtd.size = dev->blkdev->bd_inode->i_size & ~(erase_size - 1); dev->mtd.erasesize = erase_size; dev->mtd.writesize = 1; dev->mtd.writebufsize = PAGE_SIZE; @@ -276,15 +301,19 @@ static struct block2mtd_dev *add_device( dev->mtd.priv = dev; dev->mtd.owner = THIS_MODULE; - if (mtd_device_register(&dev->mtd, NULL, 0)) { + part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL); + part->name = name; + part->offset = 0; + part->size = dev->mtd.size; + if (mtd_device_register(&dev->mtd, part, 1)) { /* Device didn't get added, so free the entry */ goto err_destroy_mutex; } + list_add(&dev->list, &blkmtd_device_list); pr_info("mtd%d: [%s] erase_size = %dKiB [%d]\n", dev->mtd.index, - dev->mtd.name + strlen("block2mtd: "), - dev->mtd.erasesize >> 10, dev->mtd.erasesize); + mtdname, dev->mtd.erasesize >> 10, dev->mtd.erasesize); return dev; err_destroy_mutex: @@ -353,11 +382,12 @@ static char block2mtd_paramline[80 + 12] static int block2mtd_setup2(const char *val) { - char buf[80 + 12]; /* 80 for device, 12 for erase size */ + char buf[80 + 12 + 80 + 8]; /* 80 for device, 12 for erase size, 80 for name, 8 for timeout */ char *str = buf; - char *token[2]; + char *token[4]; char *name; size_t erase_size = PAGE_SIZE; + unsigned long timeout = MTD_DEFAULT_TIMEOUT; int i, ret; if (strnlen(val, sizeof(buf)) >= sizeof(buf)) { @@ -368,7 +398,7 @@ static int block2mtd_setup2(const char * strcpy(str, val); kill_final_newline(str); - for (i = 0; i < 2; i++) + for (i = 0; i < 4; i++) token[i] = strsep(&str, ","); if (str) { @@ -395,7 +425,13 @@ static int block2mtd_setup2(const char * } } - add_device(name, erase_size); + if (token[2] && (strlen(token[2]) + 1 > 80)) + pr_err("mtd device name too long"); + + + if (token[3] && kstrtoul(token[3], 0, &timeout)) + pr_err("invalid timeout"); + add_device(name, erase_size, token[2], timeout); return 0; } @@ -429,7 +465,7 @@ static int block2mtd_setup(const char *v module_param_call(block2mtd, block2mtd_setup, NULL, NULL, 0200); -MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>]\""); +MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>[,<name>[,<timeout>]]]\""); static int __init block2mtd_init(void) { @@ -463,8 +499,7 @@ static void block2mtd_exit(void) } } - -module_init(block2mtd_init); +late_initcall(block2mtd_init); module_exit(block2mtd_exit); MODULE_LICENSE("GPL"); --- 1.7.1
WARNING: multiple messages have this Message-ID (diff)
From: Rodrigo Freire <rfreire@redhat.com> To: "Jörn Engel" <joern@logfs.org> Cc: linux-mtd@lists.infradead.org, Felix Fietkau <nbd@openwrt.org>, dwmw2@infradead.org, linux-kernel@vger.kernel.org, Herton Krzesinski <hkrzesin@redhat.com> Subject: [RESEND PATCH V2] mtd: block2mtd: Present block2mtd timely on boot time Date: Thu, 9 Oct 2014 11:07:31 -0400 (EDT) [thread overview] Message-ID: <515696553.1577613.1412867251670.JavaMail.zimbra@redhat.com> (raw) In-Reply-To: <1807144344.40128259.1410985683342.JavaMail.zimbra@redhat.com> From: Felix Fietkau <nbd@openwrt.org> mtd: block2mtd: Ensure that block2mtd is presented in a timely fashion Currently, a block MTD device is not presented to the system on time, in order to start mounting the filesystems. This patch ensures that block2mtd is presented at the right time, so filesystems can be mounted on boot time. This issue was seen on BCM2835 (Raspberry Pi) systems when mounting JFFS2 block2mtd filesystems. This patchset also adds a MTD device name and a timeout option to the driver. Original patchset: https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.12/440-block2mtd_init.patch?rev=40444 https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.12/441-block2mtd_probe.patch?rev=40444 Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: Rodrigo Freire <rfreire@redhat.com> Signed-off-by: Herton Krzesinski <herton@redhat.com> --- V2: Uses kstrdup, removed PAGE_MASK. --- a/drivers/mtd/devices/block2mtd.c 2014-09-16 21:38:12.543952627 -0300 +++ b/drivers/mtd/devices/block2mtd.c 2014-09-17 17:43:21.424944394 -0300 @@ -9,7 +9,15 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +/* +* When the first attempt at device initialization fails, we may need to +* wait a little bit and retry. This timeout, by default 3 seconds, gives +* device time to start up. Required on BCM2708 and a few other chipsets. +*/ +#define MTD_DEFAULT_TIMEOUT 3 + #include <linux/module.h> +#include <linux/delay.h> #include <linux/fs.h> #include <linux/blkdev.h> #include <linux/bio.h> @@ -17,6 +25,7 @@ #include <linux/list.h> #include <linux/init.h> #include <linux/mtd/mtd.h> +#include <linux/mtd/partitions.h> #include <linux/mutex.h> #include <linux/mount.h> #include <linux/slab.h> @@ -209,12 +218,14 @@ static void block2mtd_free_device(struct } -static struct block2mtd_dev *add_device(char *devname, int erase_size) +static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname, int timeout) { const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL; - struct block_device *bdev; + struct block_device *bdev = ERR_PTR(-ENODEV); struct block2mtd_dev *dev; + struct mtd_partition *part; char *name; + int i; if (!devname) return NULL; @@ -225,15 +236,28 @@ static struct block2mtd_dev *add_device( /* Get a handle on the device */ bdev = blkdev_get_by_path(devname, mode, dev); -#ifndef MODULE - if (IS_ERR(bdev)) { - /* We might not have rootfs mounted at this point. Try - to resolve the device name by other means. */ - - dev_t devt = name_to_dev_t(devname); - if (devt) - bdev = blkdev_get_by_dev(devt, mode, dev); +#ifndef MODULE +/* +* We might not have the root device mounted at this point. +* Try to resolve the device name by other means. +*/ + for (i = 0; IS_ERR(bdev) && i <= timeout; i++) { + dev_t devt; + + if (i) + /* + * Calling wait_for_device_probe in the first loop + * was not enough, sleep for a bit in subsequent + * go-arounds. + */ + msleep(1000); + wait_for_device_probe(); + + devt = name_to_dev_t(devname); + if (!devt) + continue; + bdev = blkdev_get_by_dev(devt, mode, dev); } #endif @@ -257,13 +281,14 @@ static struct block2mtd_dev *add_device( /* Setup the MTD structure */ /* make the name contain the block device in */ - name = kasprintf(GFP_KERNEL, "block2mtd: %s", devname); + if (!mtdname) + mtdname = devname; + name = kstrdup (mtdname, GFP_KERNEL); if (!name) goto err_destroy_mutex; dev->mtd.name = name; - - dev->mtd.size = dev->blkdev->bd_inode->i_size & PAGE_MASK; + dev->mtd.size = dev->blkdev->bd_inode->i_size & ~(erase_size - 1); dev->mtd.erasesize = erase_size; dev->mtd.writesize = 1; dev->mtd.writebufsize = PAGE_SIZE; @@ -276,15 +301,19 @@ static struct block2mtd_dev *add_device( dev->mtd.priv = dev; dev->mtd.owner = THIS_MODULE; - if (mtd_device_register(&dev->mtd, NULL, 0)) { + part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL); + part->name = name; + part->offset = 0; + part->size = dev->mtd.size; + if (mtd_device_register(&dev->mtd, part, 1)) { /* Device didn't get added, so free the entry */ goto err_destroy_mutex; } + list_add(&dev->list, &blkmtd_device_list); pr_info("mtd%d: [%s] erase_size = %dKiB [%d]\n", dev->mtd.index, - dev->mtd.name + strlen("block2mtd: "), - dev->mtd.erasesize >> 10, dev->mtd.erasesize); + mtdname, dev->mtd.erasesize >> 10, dev->mtd.erasesize); return dev; err_destroy_mutex: @@ -353,11 +382,12 @@ static char block2mtd_paramline[80 + 12] static int block2mtd_setup2(const char *val) { - char buf[80 + 12]; /* 80 for device, 12 for erase size */ + char buf[80 + 12 + 80 + 8]; /* 80 for device, 12 for erase size, 80 for name, 8 for timeout */ char *str = buf; - char *token[2]; + char *token[4]; char *name; size_t erase_size = PAGE_SIZE; + unsigned long timeout = MTD_DEFAULT_TIMEOUT; int i, ret; if (strnlen(val, sizeof(buf)) >= sizeof(buf)) { @@ -368,7 +398,7 @@ static int block2mtd_setup2(const char * strcpy(str, val); kill_final_newline(str); - for (i = 0; i < 2; i++) + for (i = 0; i < 4; i++) token[i] = strsep(&str, ","); if (str) { @@ -395,7 +425,13 @@ static int block2mtd_setup2(const char * } } - add_device(name, erase_size); + if (token[2] && (strlen(token[2]) + 1 > 80)) + pr_err("mtd device name too long"); + + + if (token[3] && kstrtoul(token[3], 0, &timeout)) + pr_err("invalid timeout"); + add_device(name, erase_size, token[2], timeout); return 0; } @@ -429,7 +465,7 @@ static int block2mtd_setup(const char *v module_param_call(block2mtd, block2mtd_setup, NULL, NULL, 0200); -MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>]\""); +MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>[,<name>[,<timeout>]]]\""); static int __init block2mtd_init(void) { @@ -463,8 +499,7 @@ static void block2mtd_exit(void) } } - -module_init(block2mtd_init); +late_initcall(block2mtd_init); module_exit(block2mtd_exit); MODULE_LICENSE("GPL"); --- 1.7.1
next prev parent reply other threads:[~2014-10-09 15:08 UTC|newest] Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <371358190.34795877.1410204429882.JavaMail.zimbra@redhat.com> 2014-09-08 20:04 ` [PATCH] block2mtd: mtd: Present block2mtd timely on boot time Rodrigo Freire 2014-09-09 17:02 ` Jörn Engel 2014-09-09 17:02 ` Jörn Engel 2014-09-17 20:18 ` Rodrigo Freire 2014-09-17 20:18 ` Rodrigo Freire 2014-09-17 20:28 ` [PATCH V2] mtd: block2mtd: " Rodrigo Freire 2014-09-17 20:28 ` Rodrigo Freire 2014-09-17 21:21 ` Ezequiel Garcia 2014-09-17 21:21 ` Ezequiel Garcia 2014-09-17 21:41 ` Rodrigo Freire 2014-09-17 21:41 ` Rodrigo Freire 2014-10-09 15:07 ` Rodrigo Freire [this message] 2014-10-09 15:07 ` [RESEND PATCH " Rodrigo Freire 2014-11-01 13:33 ` Rodrigo Freire 2014-11-01 13:33 ` Rodrigo Freire 2014-11-07 9:44 ` Artem Bityutskiy 2014-11-07 9:44 ` Artem Bityutskiy 2014-11-07 20:05 ` Brian Norris 2014-11-07 20:05 ` Brian Norris 2014-11-05 20:01 ` Brian Norris 2014-11-05 20:01 ` Brian Norris 2014-11-05 20:23 ` [PATCH " Brian Norris 2014-11-05 20:23 ` Brian Norris 2014-11-07 14:59 ` Artem Bityutskiy 2014-11-07 14:59 ` Artem Bityutskiy 2014-11-07 15:20 ` Felix Fietkau 2014-11-07 15:20 ` Felix Fietkau 2014-11-07 15:30 ` Artem Bityutskiy 2014-11-07 15:30 ` Artem Bityutskiy 2014-11-09 12:18 ` Rodrigo Freire 2014-11-09 12:18 ` Rodrigo Freire 2014-11-26 3:33 ` Brian Norris 2014-11-26 3:33 ` Brian Norris 2014-11-26 13:32 ` Rodrigo Freire 2014-11-26 13:32 ` Rodrigo Freire 2015-02-11 15:09 ` Rodrigo Freire 2015-02-11 15:09 ` Rodrigo Freire 2014-11-09 12:18 ` [PATCH v3 0/3] mtd: block2mtd: wait for device enumeration, add name support Rodrigo Freire 2014-11-09 12:18 ` Rodrigo Freire 2014-11-09 12:21 ` [PATCH v3 1/3] mtd: block2mtd: Ensure that block2mtd is triggered after block devices are presented Rodrigo Freire 2014-11-09 12:21 ` Rodrigo Freire 2015-02-24 7:45 ` Brian Norris 2015-02-24 7:45 ` Brian Norris 2014-11-09 12:22 ` [PATCH v3 2/3] mtd: block2mtd: Adds a mtd name and a block device timeout option Rodrigo Freire 2014-11-09 12:22 ` Rodrigo Freire 2015-02-24 8:05 ` Brian Norris 2015-02-24 8:05 ` Brian Norris 2014-11-09 12:23 ` [PATCH v3 3/3] mtd: block2mtd: Removes PAGE_MASK as a index to partition size Rodrigo Freire 2014-11-09 12:23 ` Rodrigo Freire 2014-11-26 7:21 ` Brian Norris 2014-11-26 7:21 ` Brian Norris 2014-11-26 13:19 ` Rodrigo Freire 2014-11-26 13:19 ` Rodrigo Freire 2015-02-24 8:07 ` Brian Norris 2015-02-24 8:07 ` Brian Norris 2015-02-24 8:20 ` Felix Fietkau 2015-02-24 8:20 ` Felix Fietkau 2015-02-24 8:27 ` Brian Norris 2015-02-24 8:27 ` Brian Norris 2015-02-24 8:30 ` Felix Fietkau 2015-02-24 8:30 ` Felix Fietkau 2015-02-24 8:40 ` Brian Norris 2015-02-24 8:40 ` Brian Norris
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