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Tue, 4 Jul 2023 12:22:25 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id fiTSDwEPpGQQMAAAMHmgww (envelope-from ); Tue, 04 Jul 2023 12:22:25 +0000 Received: by quack3.suse.cz (Postfix, from userid 1000) id 97B9EA0763; Tue, 4 Jul 2023 14:22:24 +0200 (CEST) From: Jan Kara To: Cc: , Jens Axboe , Christoph Hellwig , Jan Kara , Alasdair Kergon , Andrew Morton , Anna Schumaker , Chao Yu , Christian Borntraeger , "Darrick J. Wong" , Dave Kleikamp , David Sterba , dm-devel@redhat.com, drbd-dev@lists.linbit.com, Gao Xiang , Jack Wang , Jaegeuk Kim , jfs-discussion@lists.sourceforge.net, Joern Engel , Joseph Qi , Kent Overstreet , linux-bcache@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-mm@kvack.org, linux-mtd@lists.infradead.org, linux-nfs@vger.kernel.org, linux-nilfs@vger.kernel.org, linux-nvme@lists.infradead.org, linux-pm@vger.kernel.org, linux-raid@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-xfs@vger.kernel.org, "Md. Haris Iqbal" , Mike Snitzer , Minchan Kim , ocfs2-devel@oss.oracle.com, reiserfs-devel@vger.kernel.org, Sergey Senozhatsky , Song Liu , Sven Schnelle , target-devel@vger.kernel.org, Ted Tso , Trond Myklebust , xen-devel@lists.xenproject.org Subject: [PATCH 01/32] block: Provide blkdev_get_handle_* functions Date: Tue, 4 Jul 2023 14:21:28 +0200 Message-Id: <20230704122224.16257-1-jack@suse.cz> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230629165206.383-1-jack@suse.cz> References: <20230629165206.383-1-jack@suse.cz> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=5599; i=jack@suse.cz; h=from:subject; bh=repJSb0/C5PfG8Cx5q/n/kNJZOabhc2tYWxiICNNTtg=; b=owGbwMvMwME4Z+4qdvsUh5uMp9WSGFKW8J3uuK2gorZt+knOzhX81snTGX/57phWXzfXM3w+50Xl rfb7OxmNWRgYORhkxRRZVkde1L42z6hra6iGDMwgViaQKQxcnAIwERsLDobphetsJoi99quKYIut26 wgv/K+lUS+secym02t85epsOp8rtu3acJMN1WFRiX1irKCnSu+LXh+rVyp65RAEGttl+XcP32mOR0n ZJYFm7orF8YFnhVftYzZjm2Rva3I0oqXdap/bUJr8qNjVVfHnBRiFEv0Ocgpck1jlTHfEWUu71NrKu 8EXrbnsfD7wm1qKHDqnnnD21y1n9OFHn8/7qJz4O19panPLvMxrOrNn970IcH6rnhQsq0ZS1v6JUfN RS5ah5XMXNI/c14+vVlVkPVI9n2HQNZlEfdsO13VFx17Z7f0vKnN9UZZ3Zii6WbsWS81/qefFs1Ljl +dK1sZIpSRdXfx+jksz9T4il4AAA== X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C X-Rspamd-Queue-Id: 40D061C0025 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: p88c8jatxw65n61kxnp4oqb8brhhinsr X-HE-Tag: 1688473346-710850 X-HE-Meta: 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 t08nvMbO 6MR0lAhTr7SwoOBw8poJ2hO5nPP2gJgOZsBYPo+D/5hZ4CcFfn869DVY5Hc9XS6LupTFqEye3nQQAbQtYg5B3yQy0lvDs7dFrn7zfp6Xtc3NFoI02mbedHNWfACTUMB2bEmeG4u0mwuypjGOSIrIm8tTOvbc5l+F4FGzOilwWul/Kn36WMZ8D2JALlgV1IDbHN/mmpqZGJwOo7F+1RKFjzy5J4SFxLFOCZZF4XwBvASRGPsj9yqtD5T+MKr7HAMLDC3JrnW7KuYwFcg8D1AQ9fWPoUSwhKRh35Rlh3w4li7PRp9nPK68fFw7Wklv8ntRqjT0yB9L+dk78HH/RlPPabpHMJcnWpFcGGA6hg9A1u2y/w4t1OUndpuIJZiFYzBLcZ3UwvHswGxiuP8FVhx4nOz8SPpBBQLNJQBil9ixImREdI7HeeN9+gKsUoI1tRkTKlsXiIhONU/txTeoKL2gjE9xA994244fclkbegvwrlu1ILxHUXtIDC3Ucc8C9Evbs99uXm9TkLRIyt47Rrad/YC+HrgaTYe4t0+SMzFHlGDUz1MnV8Z0z+6Bo/D+YbUSdJetcPHrNRveRhWJBa/THlFQD2UUTDZal8wO7NCJLguSQsh+Jd0OhBsBC2//OKPWu7T5mOdS/zbl7GLN6joLpK4lgVzuEHPdpCVk5nqIEAAIXsDOP5IRjshmFCZbMPFTfxXtKjypGiOHlA8ZOQ1rAKR43pcFBWlkFoE/VtGQpqQei/zPWUIAuT4+FD1gEy3hqMn9yRYrgCTnl9E3ag/RJmdXudLMmzO1OwrDFFW+4cnfrhUV/Ko8QA3+ai2PLZ0aaprJOROOaUaExsU+4ZHM5a652FIbyZuWa6D0VxDDSF2JuPlmiAUvHnghQ2TnW3OWjFI0hjl3bzBeH6QKDppAFqRLnxtp1/Xbe/YzP+9USvusaFlqedw/ebzJ2wSq+u6fzfZJiSJ/jWFQsvnvIHz6LQMT0ediU 49i/w+24 6JjL4MF/DU2nN+6X9CBD9jvvH4fTESnCa2d2FE7G4YlI835naieZU1uDj5VGhKK/6LV1DyuJYq2OH81j8B/xHcUZLTINw8Q3xfg5zoEmyUtiy5WLAXu11oAhUoHov9lCyLpyZ6pCnx3aamojcDzulnWuvodxmd7/RNkjIUgeJsuh2AjqximB7g== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Create struct bdev_handle that contains all parameters that need to be passed to blkdev_put() and provide blkdev_get_handle_* functions that return this structure instead of plain bdev pointer. This will eventually allow us to pass one more argument to blkdev_put() without too much hassle. CC: Alasdair Kergon CC: Andrew Morton CC: Anna Schumaker CC: Chao Yu CC: Christian Borntraeger CC: Coly Li CC: Dave Kleikamp CC: David Sterba CC: dm-devel@redhat.com CC: drbd-dev@lists.linbit.com CC: Gao Xiang CC: Jack Wang CC: Jaegeuk Kim CC: jfs-discussion@lists.sourceforge.net CC: Joern Engel CC: Joseph Qi CC: Kent Overstreet CC: linux-bcache@vger.kernel.org CC: linux-btrfs@vger.kernel.org CC: linux-erofs@lists.ozlabs.org CC: CC: linux-f2fs-devel@lists.sourceforge.net CC: linux-mm@kvack.org CC: linux-mtd@lists.infradead.org CC: linux-nfs@vger.kernel.org CC: linux-nilfs@vger.kernel.org CC: linux-nvme@lists.infradead.org CC: linux-pm@vger.kernel.org CC: linux-raid@vger.kernel.org CC: linux-s390@vger.kernel.org CC: linux-scsi@vger.kernel.org CC: linux-xfs@vger.kernel.org CC: "Md. Haris Iqbal" CC: Mike Snitzer CC: Minchan Kim CC: ocfs2-devel@oss.oracle.com CC: reiserfs-devel@vger.kernel.org CC: Sergey Senozhatsky CC: Song Liu CC: Sven Schnelle CC: target-devel@vger.kernel.org CC: Ted Tso CC: Trond Myklebust CC: xen-devel@lists.xenproject.org Signed-off-by: Jan Kara --- block/bdev.c | 47 ++++++++++++++++++++++++++++++++++++++++++ include/linux/blkdev.h | 10 +++++++++ 2 files changed, 57 insertions(+) diff --git a/block/bdev.c b/block/bdev.c index 979e28a46b98..c75de5cac2bc 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -846,6 +846,24 @@ struct block_device *blkdev_get_by_dev(dev_t dev, blk_mode_t mode, void *holder, } EXPORT_SYMBOL(blkdev_get_by_dev); +struct bdev_handle *blkdev_get_handle_by_dev(dev_t dev, blk_mode_t mode, + void *holder, const struct blk_holder_ops *hops) +{ + struct bdev_handle *handle = kmalloc(sizeof(struct bdev_handle), + GFP_KERNEL); + struct block_device *bdev; + + if (!handle) + return ERR_PTR(-ENOMEM); + bdev = blkdev_get_by_dev(dev, mode, holder, hops); + if (IS_ERR(bdev)) + return ERR_CAST(bdev); + handle->bdev = bdev; + handle->holder = holder; + return handle; +} +EXPORT_SYMBOL(blkdev_get_handle_by_dev); + /** * blkdev_get_by_path - open a block device by name * @path: path to the block device to open @@ -884,6 +902,28 @@ struct block_device *blkdev_get_by_path(const char *path, blk_mode_t mode, } EXPORT_SYMBOL(blkdev_get_by_path); +struct bdev_handle *blkdev_get_handle_by_path(const char *path, blk_mode_t mode, + void *holder, const struct blk_holder_ops *hops) +{ + struct bdev_handle *handle; + dev_t dev; + int error; + + error = lookup_bdev(path, &dev); + if (error) + return ERR_PTR(error); + + handle = blkdev_get_handle_by_dev(dev, mode, holder, hops); + if (!IS_ERR(handle) && (mode & BLK_OPEN_WRITE) && + bdev_read_only(handle->bdev)) { + blkdev_handle_put(handle); + return ERR_PTR(-EACCES); + } + + return handle; +} +EXPORT_SYMBOL(blkdev_get_handle_by_path); + void blkdev_put(struct block_device *bdev, void *holder) { struct gendisk *disk = bdev->bd_disk; @@ -920,6 +960,13 @@ void blkdev_put(struct block_device *bdev, void *holder) } EXPORT_SYMBOL(blkdev_put); +void blkdev_handle_put(struct bdev_handle *handle) +{ + blkdev_put(handle->bdev, handle->holder); + kfree(handle); +} +EXPORT_SYMBOL(blkdev_handle_put); + /** * lookup_bdev() - Look up a struct block_device by name. * @pathname: Name of the block device in the filesystem. diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index ed44a997f629..a910e9997ddd 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1471,14 +1471,24 @@ struct blk_holder_ops { #define sb_open_mode(flags) \ (BLK_OPEN_READ | (((flags) & SB_RDONLY) ? 0 : BLK_OPEN_WRITE)) +struct bdev_handle { + struct block_device *bdev; + void *holder; +}; + struct block_device *blkdev_get_by_dev(dev_t dev, blk_mode_t mode, void *holder, const struct blk_holder_ops *hops); struct block_device *blkdev_get_by_path(const char *path, blk_mode_t mode, void *holder, const struct blk_holder_ops *hops); +struct bdev_handle *blkdev_get_handle_by_dev(dev_t dev, blk_mode_t mode, + void *holder, const struct blk_holder_ops *hops); +struct bdev_handle *blkdev_get_handle_by_path(const char *path, blk_mode_t mode, + void *holder, const struct blk_holder_ops *hops); int bd_prepare_to_claim(struct block_device *bdev, void *holder, const struct blk_holder_ops *hops); void bd_abort_claiming(struct block_device *bdev, void *holder); void blkdev_put(struct block_device *bdev, void *holder); +void blkdev_handle_put(struct bdev_handle *handle); /* just for blk-cgroup, don't use elsewhere */ struct block_device *blkdev_get_no_open(dev_t dev);