linux/block/partitions/check.h, branch master

block: partitions: Replace pp_buf with struct seq_buf

2026-03-21T14:27:08Z

In preparation for removing the strlcat API[1], replace the char *pp_buf with a struct seq_buf, which tracks the current write position and remaining space internally. This allows for: - Direct use of seq_buf_printf() in place of snprintf()+strlcat() pairs, eliminating local tmp buffers throughout. - Adjacent strlcat() calls that build strings piece-by-piece (e.g., strlcat("["); strlcat(name); strlcat("]")) to be collapsed into single seq_buf_printf() calls. - Simpler call sites: seq_buf_puts() takes only the buffer and string, with no need to pass PAGE_SIZE at every call. The backing buffer allocation is unchanged (__get_free_page), and the output path uses seq_buf_str() to NUL-terminate before passing to printk(). Link: https://github.com/KSPP/linux/issues/370 [1] Cc: Andy Shevchenko Cc: Josh Law Signed-off-by: Kees Cook Reviewed-by: Josh Law Link: https://patch.msgid.link/20260321004840.work.670-kees@kernel.org Signed-off-by: Jens Axboe

block: add support for partition table defined in OF

2024-10-22T14:14:56Z

Add support for partition table defined in Device Tree. Similar to how it's done with MTD, add support for defining a fixed partition table in device tree. A common scenario for this is fixed block (eMMC) embedded devices that have no MBR or GPT partition table to save storage space. Bootloader access the block device with absolute address of data. This is to complete the functionality with an equivalent implementation with providing partition table with bootargs, for case where the booargs can't be modified and tweaking the Device Tree is the only solution to have an usabe partition table. The implementation follow the fixed-partitions parser used on MTD devices where a "partitions" node is expected to be declared with "fixed-partitions" compatible in the OF node of the disk device (mmc-card for eMMC for example) and each child node declare a label and a reg with offset and size. If label is not declared, the node name is used as fallback. Eventually is also possible to declare the read-only property to flag the partition as read-only. Signed-off-by: Christian Marangi Reviewed-by: Christoph Hellwig Link: https://lore.kernel.org/r/20241002221306.4403-6-ansuelsmth@gmail.com Signed-off-by: Jens Axboe

block: Convert read_part_sector() to use a folio

2022-08-02T16:34:03Z

This relatively straightforward converion saves a call to compound_head() hidden inside put_page(). Signed-off-by: Matthew Wilcox (Oracle)

block: remove genhd.h

2022-02-02T14:49:59Z

There is no good reason to keep genhd.h separate from the main blkdev.h header that includes it. So fold the contents of genhd.h into blkdev.h and remove genhd.h entirely. Signed-off-by: Christoph Hellwig Reviewed-by: Chaitanya Kulkarni Reviewed-by: Martin K. Petersen Link: https://lore.kernel.org/r/20220124093913.742411-4-hch@lst.de Signed-off-by: Jens Axboe

block: store a gendisk in struct parsed_partitions

2021-08-12T16:31:35Z

Partition scanning only happens on the whole device, so pass a struct gendisk instead of the whole device block_device to the scanners. This allows to simplify printing the device name in various places as the disk name is available in disk->name. Signed-off-by: Christoph Hellwig Reviewed-by: Stefan Haberland Link: https://lore.kernel.org/r/20210810154512.1809898-2-hch@lst.de Signed-off-by: Jens Axboe

block: move block layer internals out of include/linux/genhd.h

2020-03-25T15:50:08Z

None of this needs to be exposed to drivers. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

block: merge partition-generic.c and check.c

2020-03-24T13:57:08Z

Merge block/partition-generic.c and block/partitions/check.c into a single block/partitions/core.c as the content is closely related and both files are tiny. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

block: declare all partition detection routines in check.h

2020-03-24T13:57:08Z

There is no good reason to include one header per partition type in core.c. Instead move the prototypes for the detection routins to check.h, and remove all now empty headers in block/partitions/. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

block: remove warn_no_part

2020-03-24T13:57:08Z

The warn_no_part is initialized to 1 and never changed. Remove it and execute the code keyed off from it unconditionally. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

block: unexport read_dev_sector and put_dev_sector

2020-03-24T13:57:08Z

read_dev_sector and put_dev_sector are now only used by the partition parsing code. Remove the export for read_dev_sector and merge it into the only caller. Clean the mess up a bit by using goto labels and the SECTOR_SHIFT constant. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe