From b57102841846d9840dcb1b8b308f6d7369b8e5c5 Mon Sep 17 00:00:00 2001 From: Corentin Chary Date: Mon, 28 Sep 2009 21:10:11 +0200 Subject: [PATCH 1/6] UBI: Add ubi_open_volume_path Add an 'ubi_open_volume_path(path, mode)' function which works like 'open_bdev_exclusive(path, mode, ...)' where path is the special file representing the UBI volume, typically /dev/ubi0_0. This is needed to teach UBIFS being able to mount UBI character devices. [Comments and the patch were amended a bit by Artem] Signed-off-by: Corentin Chary Signed-off-by: Artem Bityutskiy --- drivers/mtd/ubi/kapi.c | 40 ++++++++++++++++++++++++++++++++++++++++ include/linux/mtd/ubi.h | 2 ++ 2 files changed, 42 insertions(+) diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c index 88a72e9c8be..277786ebaa2 100644 --- a/drivers/mtd/ubi/kapi.c +++ b/drivers/mtd/ubi/kapi.c @@ -22,6 +22,8 @@ #include #include +#include +#include #include #include "ubi.h" @@ -279,6 +281,44 @@ struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name, } EXPORT_SYMBOL_GPL(ubi_open_volume_nm); +/** + * ubi_open_volume_path - open UBI volume by its character device node path. + * @pathname: volume character device node path + * @mode: open mode + * + * This function is similar to 'ubi_open_volume()', but opens a volume the path + * to its character device node. + */ +struct ubi_volume_desc *ubi_open_volume_path(const char *pathname, int mode) +{ + int error, ubi_num, vol_id; + struct ubi_volume_desc *ret; + struct inode *inode; + struct path path; + + dbg_gen("open volume %s, mode %d", pathname, mode); + + if (!pathname || !*pathname) + return ERR_PTR(-EINVAL); + + error = kern_path(pathname, LOOKUP_FOLLOW, &path); + if (error) + return ERR_PTR(error); + + inode = path.dentry->d_inode; + ubi_num = ubi_major2num(imajor(inode)); + vol_id = iminor(inode) - 1; + + if (vol_id >= 0 && ubi_num >= 0) + ret = ubi_open_volume(ubi_num, vol_id, mode); + else + ret = ERR_PTR(-ENODEV); + + path_put(&path); + return ret; +} +EXPORT_SYMBOL_GPL(ubi_open_volume_path); + /** * ubi_close_volume - close UBI volume. * @desc: volume descriptor diff --git a/include/linux/mtd/ubi.h b/include/linux/mtd/ubi.h index 6913b71d9ab..b31bd9e9bca 100644 --- a/include/linux/mtd/ubi.h +++ b/include/linux/mtd/ubi.h @@ -174,6 +174,8 @@ void ubi_get_volume_info(struct ubi_volume_desc *desc, struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode); struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name, int mode); +struct ubi_volume_desc *ubi_open_volume_path(const char *pathname, int mode); + int ubi_register_volume_notifier(struct notifier_block *nb, int ignore_existing); int ubi_unregister_volume_notifier(struct notifier_block *nb); From 9722324e65a017ea0ce39236a2f87c649bb7c39d Mon Sep 17 00:00:00 2001 From: Corentin Chary Date: Mon, 28 Sep 2009 21:10:12 +0200 Subject: [PATCH 2/6] UBIFS: support mounting of UBI volume character devices This patch makes it possible to mount UBI character device nodes, and use something like: $ mount -t ubifs /dev/ubi_volume_name /mnt/ubifs instead of the old restrictive 'nodev' semantics: $ mount -t ubifs ubi0_0 /mnt/ubifs [Comments and the patch were amended a bit by Artem] Signed-off-by: Corentin Chary Signed-off-by: Artem Bityutskiy --- fs/ubifs/super.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index 333e181ee98..943ad562453 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -1842,22 +1842,32 @@ const struct super_operations ubifs_super_operations = { * @name: UBI volume name * @mode: UBI volume open mode * - * There are several ways to specify UBI volumes when mounting UBIFS: - * o ubiX_Y - UBI device number X, volume Y; - * o ubiY - UBI device number 0, volume Y; + * The primary method of mounting UBIFS is by specifying the UBI volume + * character device node path. However, UBIFS may also be mounted withoug any + * character device node using one of the following methods: + * + * o ubiX_Y - mount UBI device number X, volume Y; + * o ubiY - mount UBI device number 0, volume Y; * o ubiX:NAME - mount UBI device X, volume with name NAME; * o ubi:NAME - mount UBI device 0, volume with name NAME. * * Alternative '!' separator may be used instead of ':' (because some shells * like busybox may interpret ':' as an NFS host name separator). This function - * returns ubi volume object in case of success and a negative error code in - * case of failure. + * returns UBI volume description object in case of success and a negative + * error code in case of failure. */ static struct ubi_volume_desc *open_ubi(const char *name, int mode) { + struct ubi_volume_desc *ubi; int dev, vol; char *endptr; + /* First, try to open using the device node path method */ + ubi = ubi_open_volume_path(name, mode); + if (!IS_ERR(ubi)) + return ubi; + + /* Try the "nodev" method */ if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i') return ERR_PTR(-EINVAL); From 774888bcd646c7055ac69ad4fd0c0fff0827ee39 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 30 Sep 2009 22:17:16 +0200 Subject: [PATCH 3/6] UBIFS: remove manual O_SYNC handling generic_file_aio_write already calls into ->fsync to handle O_SYNC/O_DSYNC. Remove the duplicate call to ubifs_sync_wbufs_by_inode which is already covered by ubifs_fsync. Signed-off-by: Christoph Hellwig Signed-off-by: Artem Bityutskiy --- fs/ubifs/file.c | 13 +------------ 1 file changed, 1 insertion(+), 12 deletions(-) diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c index 1009adc8d60..39849f887e7 100644 --- a/fs/ubifs/file.c +++ b/fs/ubifs/file.c @@ -1389,7 +1389,6 @@ static ssize_t ubifs_aio_write(struct kiocb *iocb, const struct iovec *iov, unsigned long nr_segs, loff_t pos) { int err; - ssize_t ret; struct inode *inode = iocb->ki_filp->f_mapping->host; struct ubifs_info *c = inode->i_sb->s_fs_info; @@ -1397,17 +1396,7 @@ static ssize_t ubifs_aio_write(struct kiocb *iocb, const struct iovec *iov, if (err) return err; - ret = generic_file_aio_write(iocb, iov, nr_segs, pos); - if (ret < 0) - return ret; - - if (ret > 0 && (IS_SYNC(inode) || iocb->ki_filp->f_flags & O_SYNC)) { - err = ubifs_sync_wbufs_by_inode(c, inode); - if (err) - return err; - } - - return ret; + return generic_file_aio_write(iocb, iov, nr_segs, pos); } static int ubifs_set_page_dirty(struct page *page) From 949cb6232d5fc9fa77cfa441418e12d6f9de163e Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Tue, 20 Oct 2009 10:21:45 +0300 Subject: [PATCH 4/6] MAINTAINERS: change e-mail of Artem Bityutskiy Nowadays I have all my comunity-related stuff at gmail, so update my e-mail address. Signed-off-by: Artem Bityutskiy --- MAINTAINERS | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/MAINTAINERS b/MAINTAINERS index c824b4d6275..8a158e1a9c4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -5241,7 +5241,7 @@ S: Maintained F: drivers/scsi/u14-34f.c UBI FILE SYSTEM (UBIFS) -M: Artem Bityutskiy +M: Artem Bityutskiy M: Adrian Hunter L: linux-mtd@lists.infradead.org T: git git://git.infradead.org/ubifs-2.6.git @@ -5292,7 +5292,7 @@ F: drivers/cdrom/cdrom.c F: include/linux/cdrom.h UNSORTED BLOCK IMAGES (UBI) -M: Artem Bityutskiy +M: Artem Bityutskiy W: http://www.linux-mtd.infradead.org/ L: linux-mtd@lists.infradead.org T: git git://git.infradead.org/ubi-2.6.git From 6afaf8a484cbbfd2ccf58a4e5396d1f280469789 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Sun, 29 Nov 2009 19:46:02 +0100 Subject: [PATCH 5/6] UBI: flush wl before clearing update marker ubiupdatevol -t does the following: - ubi_start_update() - set_update_marker() - for all LEBs ubi_eba_unmap_leb() - clear_update_marker() - ubi_wl_flush() ubi_wl_flush() physically erases all PEB, once it returns all PEBs are empty. clear_update_marker() has the update marker written after return. If there is a power cut between the last two functions then the UBI volume has no longer the "update" marker set and may have some valid LEBs while some of them may be gone. If that volume in question happens to be a UBIFS volume, then mount will fail with |UBIFS error (pid 1361): ubifs_read_node: bad node type (255 but expected 6) |UBIFS error (pid 1361): ubifs_read_node: bad node at LEB 0:0 |Not a node, first 24 bytes: |00000000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff if there is at least one valid LEB and the wear-leveling worker managed to clear LEB 0. The patch waits for the wl worker to finish prior clearing the "update" marker on flash. The two new LEB which are scheduled for erasing after clear_update_marker() should not matter because they are only visible to UBI. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Artem Bityutskiy Cc: stable@kernel.org --- drivers/mtd/ubi/upd.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/drivers/mtd/ubi/upd.c b/drivers/mtd/ubi/upd.c index 74fdc40c862..c1d7b880c79 100644 --- a/drivers/mtd/ubi/upd.c +++ b/drivers/mtd/ubi/upd.c @@ -147,12 +147,14 @@ int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol, } if (bytes == 0) { + err = ubi_wl_flush(ubi); + if (err) + return err; + err = clear_update_marker(ubi, vol, 0); if (err) return err; - err = ubi_wl_flush(ubi); - if (!err) - vol->updating = 0; + vol->updating = 0; } vol->upd_buf = vmalloc(ubi->leb_size); @@ -362,16 +364,16 @@ int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol, ubi_assert(vol->upd_received <= vol->upd_bytes); if (vol->upd_received == vol->upd_bytes) { + err = ubi_wl_flush(ubi); + if (err) + return err; /* The update is finished, clear the update marker */ err = clear_update_marker(ubi, vol, vol->upd_bytes); if (err) return err; - err = ubi_wl_flush(ubi); - if (err == 0) { - vol->updating = 0; - err = to_write; - vfree(vol->upd_buf); - } + vol->updating = 0; + err = to_write; + vfree(vol->upd_buf); } return err; From b38882f5c066dc681679e90f1903eda323e605b1 Mon Sep 17 00:00:00 2001 From: Roel Kluin Date: Mon, 7 Dec 2009 14:21:45 +0100 Subject: [PATCH 6/6] UBIFS: fix return code in check_leaf Return the PTR_ERR of the correct pointer. This fixes the debugging code. Signed-off-by: Roel Kluin Signed-off-by: Artem Bityutskiy --- fs/ubifs/debug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c index dbc093afd94..8a771c59ac3 100644 --- a/fs/ubifs/debug.c +++ b/fs/ubifs/debug.c @@ -2014,7 +2014,7 @@ static int check_leaf(struct ubifs_info *c, struct ubifs_zbranch *zbr, inum = key_inum_flash(c, &dent->key); fscki1 = read_add_inode(c, priv, inum); if (IS_ERR(fscki1)) { - err = PTR_ERR(fscki); + err = PTR_ERR(fscki1); ubifs_err("error %d while processing entry node and " "trying to find parent inode node %lu", err, (unsigned long)inum);