cregit-Linux how code gets into the kernel

Release 4.14 drivers/mtd/mtdpart.c

Directory: drivers/mtd
/*
 * Simple MTD partitioning layer
 *
 * Copyright © 2000 Nicolas Pitre <nico@fluxnic.net>
 * Copyright © 2002 Thomas Gleixner <gleixner@linutronix.de>
 * Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/kmod.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/err.h>

#include "mtdcore.h"

/* Our partition linked list */
static LIST_HEAD(mtd_partitions);
static DEFINE_MUTEX(mtd_partitions_mutex);

/**
 * struct mtd_part - our partition node structure
 *
 * @mtd: struct holding partition details
 * @parent: parent mtd - flash device or another partition
 * @offset: partition offset relative to the *flash device*
 */

struct mtd_part {
	
struct mtd_info mtd;
	
struct mtd_info *parent;
	
uint64_t offset;
	
struct list_head list;
};

/*
 * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
 * the pointer to that structure.
 */

static inline struct mtd_part *mtd_to_part(const struct mtd_info *mtd) { return container_of(mtd, struct mtd_part, mtd); }

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Brian Norris2492.31%150.00%
Linus Torvalds (pre-git)27.69%150.00%
Total26100.00%2100.00%

/* * MTD methods which simply translate the effective address and pass through * to the _real_ device. */
static int part_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { struct mtd_part *part = mtd_to_part(mtd); struct mtd_ecc_stats stats; int res; stats = part->parent->ecc_stats; res = part->parent->_read(part->parent, from + part->offset, len, retlen, buf); if (unlikely(mtd_is_eccerr(res))) mtd->ecc_stats.failed += part->parent->ecc_stats.failed - stats.failed; else mtd->ecc_stats.corrected += part->parent->ecc_stats.corrected - stats.corrected; return res; }

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PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5140.80%112.50%
Yauhen Kharuzhy2923.20%112.50%
Thomas Gleixner2419.20%112.50%
Mike Dunn1310.40%225.00%
Rafał Miłecki54.00%112.50%
Brian Norris32.40%225.00%
Total125100.00%8100.00%


static int part_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, void **virt, resource_size_t *phys) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_point(part->parent, from + part->offset, len, retlen, virt, phys); }

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PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4669.70%116.67%
Jared Hulbert913.64%116.67%
David Woodhouse46.06%116.67%
Mike Dunn46.06%116.67%
Rafał Miłecki23.03%116.67%
Brian Norris11.52%116.67%
Total66100.00%6100.00%


static int part_unpoint(struct mtd_info *mtd, loff_t from, size_t len) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_unpoint(part->parent, from + part->offset, len); }

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PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3268.09%116.67%
David Woodhouse510.64%116.67%
Mike Dunn48.51%116.67%
Artem B. Bityutskiy36.38%116.67%
Rafał Miłecki24.26%116.67%
Brian Norris12.13%116.67%
Total47100.00%6100.00%


static unsigned long part_get_unmapped_area(struct mtd_info *mtd, unsigned long len, unsigned long offset, unsigned long flags) { struct mtd_part *part = mtd_to_part(mtd); offset += part->offset; return part->parent->_get_unmapped_area(part->parent, len, offset, flags); }

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David Howells5187.93%125.00%
Mike Dunn46.90%125.00%
Rafał Miłecki23.45%125.00%
Brian Norris11.72%125.00%
Total58100.00%4100.00%


static int part_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) { struct mtd_part *part = mtd_to_part(mtd); int res; if (from >= mtd->size) return -EINVAL; if (ops->datbuf && from + ops->len > mtd->size) return -EINVAL; /* * If OOB is also requested, make sure that we do not read past the end * of this partition. */ if (ops->oobbuf) { size_t len, pages; len = mtd_oobavail(mtd, ops); pages = mtd_div_by_ws(mtd->size, mtd); pages -= mtd_div_by_ws(from, mtd); if (ops->ooboffs + ops->ooblen > pages * len) return -EINVAL; } res = part->parent->_read_oob(part->parent, from + part->offset, ops); if (unlikely(res)) { if (mtd_is_bitflip(res)) mtd->ecc_stats.corrected++; if (mtd_is_eccerr(res)) mtd->ecc_stats.failed++; } return res; }

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PersonTokensPropCommitsCommitProp
Artem B. Bityutskiy5630.11%19.09%
Thomas Gleixner5227.96%218.18%
Linus Torvalds (pre-git)3719.89%19.09%
David Woodhouse1910.22%19.09%
Brian Norris73.76%218.18%
Boris Brezillon52.69%19.09%
Mike Dunn42.15%19.09%
Vitaly Wool42.15%19.09%
Rafał Miłecki21.08%19.09%
Total186100.00%11100.00%


static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_read_user_prot_reg(part->parent, from, len, retlen, buf); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3360.00%120.00%
David Woodhouse1527.27%120.00%
Mike Dunn47.27%120.00%
Rafał Miłecki23.64%120.00%
Brian Norris11.82%120.00%
Total55100.00%5100.00%


static int part_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, struct otp_info *buf) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_get_user_prot_info(part->parent, len, retlen, buf); }

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PersonTokensPropCommitsCommitProp
Nico Pitre3364.71%120.00%
Christian Riesch1121.57%120.00%
Mike Dunn47.84%120.00%
Rafał Miłecki23.92%120.00%
Brian Norris11.96%120.00%
Total51100.00%5100.00%


static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_read_fact_prot_reg(part->parent, from, len, retlen, buf); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3360.00%120.00%
David Woodhouse1527.27%120.00%
Mike Dunn47.27%120.00%
Rafał Miłecki23.64%120.00%
Brian Norris11.82%120.00%
Total55100.00%5100.00%


static int part_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen, struct otp_info *buf) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_get_fact_prot_info(part->parent, len, retlen, buf); }

Contributors

PersonTokensPropCommitsCommitProp
Nico Pitre3364.71%120.00%
Christian Riesch1121.57%120.00%
Mike Dunn47.84%120.00%
Rafał Miłecki23.92%120.00%
Brian Norris11.96%120.00%
Total51100.00%5100.00%


static int part_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_write(part->parent, to + part->offset, len, retlen, buf); }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse3253.33%120.00%
Linus Torvalds2135.00%120.00%
Mike Dunn46.67%120.00%
Rafał Miłecki23.33%120.00%
Brian Norris11.67%120.00%
Total60100.00%5100.00%


static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_panic_write(part->parent, to + part->offset, len, retlen, buf); }

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PersonTokensPropCommitsCommitProp
Richard Purdie5388.33%125.00%
Mike Dunn46.67%125.00%
Rafał Miłecki23.33%125.00%
Brian Norris11.67%125.00%
Total60100.00%4100.00%


static int part_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops) { struct mtd_part *part = mtd_to_part(mtd); if (to >= mtd->size) return -EINVAL; if (ops->datbuf && to + ops->len > mtd->size) return -EINVAL; return part->parent->_write_oob(part->parent, to + part->offset, ops); }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse5770.37%116.67%
Thomas Gleixner1316.05%116.67%
Mike Dunn44.94%116.67%
Vitaly Wool44.94%116.67%
Rafał Miłecki22.47%116.67%
Brian Norris11.23%116.67%
Total81100.00%6100.00%


static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_write_user_prot_reg(part->parent, from, len, retlen, buf); }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse4887.27%125.00%
Mike Dunn47.27%125.00%
Rafał Miłecki23.64%125.00%
Brian Norris11.82%125.00%
Total55100.00%4100.00%


static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_lock_user_prot_reg(part->parent, from, len); }

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PersonTokensPropCommitsCommitProp
Nico Pitre3683.72%125.00%
Mike Dunn49.30%125.00%
Rafał Miłecki24.65%125.00%
Brian Norris12.33%125.00%
Total43100.00%4100.00%


static int part_writev(struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_writev(part->parent, vecs, count, to + part->offset, retlen); }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse5487.10%120.00%
Mike Dunn46.45%120.00%
Rafał Miłecki23.23%120.00%
Brian Norris11.61%120.00%
Al Viro11.61%120.00%
Total62100.00%5100.00%


static int part_erase(struct mtd_info *mtd, struct erase_info *instr) { struct mtd_part *part = mtd_to_part(mtd); int ret; instr->addr += part->offset; ret = part->parent->_erase(part->parent, instr); if (ret) { if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) instr->fail_addr -= part->offset; instr->addr -= part->offset; } return ret; }

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PersonTokensPropCommitsCommitProp
David Woodhouse4856.47%337.50%
Adrian Hunter3035.29%225.00%
Mike Dunn44.71%112.50%
Rafał Miłecki22.35%112.50%
Brian Norris11.18%112.50%
Total85100.00%8100.00%


void mtd_erase_callback(struct erase_info *instr) { if (instr->mtd->_erase == part_erase) { struct mtd_part *part = mtd_to_part(instr->mtd); if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) instr->fail_addr -= part->offset; instr->addr -= part->offset; } if (instr->callback) instr->callback(instr); }

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PersonTokensPropCommitsCommitProp
David Woodhouse6895.77%350.00%
Adrian Hunter11.41%116.67%
Artem B. Bityutskiy11.41%116.67%
Brian Norris11.41%116.67%
Total71100.00%6100.00%

EXPORT_SYMBOL_GPL(mtd_erase_callback);
static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_lock(part->parent, ofs + part->offset, len); }

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PersonTokensPropCommitsCommitProp
David Woodhouse3982.98%120.00%
Mike Dunn48.51%120.00%
Rafał Miłecki24.26%120.00%
Adrian Hunter12.13%120.00%
Brian Norris12.13%120.00%
Total47100.00%5100.00%


static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_unlock(part->parent, ofs + part->offset, len); }

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PersonTokensPropCommitsCommitProp
David Woodhouse3982.98%120.00%
Mike Dunn48.51%120.00%
Rafał Miłecki24.26%120.00%
Adrian Hunter12.13%120.00%
Brian Norris12.13%120.00%
Total47100.00%5100.00%


static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_is_locked(part->parent, ofs + part->offset, len); }

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Richard Cochran4085.11%125.00%
Mike Dunn48.51%125.00%
Rafał Miłecki24.26%125.00%
Brian Norris12.13%125.00%
Total47100.00%4100.00%


static void part_sync(struct mtd_info *mtd) { struct mtd_part *part = mtd_to_part(mtd); part->parent->_sync(part->parent); }

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PersonTokensPropCommitsCommitProp
David Woodhouse2578.12%125.00%
Mike Dunn412.50%125.00%
Rafał Miłecki26.25%125.00%
Brian Norris13.12%125.00%
Total32100.00%4100.00%


static int part_suspend(struct mtd_info *mtd) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_suspend(part->parent); }

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PersonTokensPropCommitsCommitProp
David Woodhouse2266.67%120.00%
Mike Dunn412.12%120.00%
Linus Torvalds412.12%120.00%
Rafał Miłecki26.06%120.00%
Brian Norris13.03%120.00%
Total33100.00%5100.00%


static void part_resume(struct mtd_info *mtd) { struct mtd_part *part = mtd_to_part(mtd); part->parent->_resume(part->parent); }

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PersonTokensPropCommitsCommitProp
Linus Torvalds2578.12%125.00%
Mike Dunn412.50%125.00%
Rafał Miłecki26.25%125.00%
Brian Norris13.12%125.00%
Total32100.00%4100.00%


static int part_block_isreserved(struct mtd_info *mtd, loff_t ofs) { struct mtd_part *part = mtd_to_part(mtd); ofs += part->offset; return part->parent->_block_isreserved(part->parent, ofs); }

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PersonTokensPropCommitsCommitProp
Ezequiel García4193.18%133.33%
Rafał Miłecki24.55%133.33%
Brian Norris12.27%133.33%
Total44100.00%3100.00%


static int part_block_isbad(struct mtd_info *mtd, loff_t ofs) { struct mtd_part *part = mtd_to_part(mtd); ofs += part->offset; return part->parent->_block_isbad(part->parent, ofs); }

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PersonTokensPropCommitsCommitProp
David Woodhouse3784.09%125.00%
Mike Dunn49.09%125.00%
Rafał Miłecki24.55%125.00%
Brian Norris12.27%125.00%
Total44100.00%4100.00%


static int part_block_markbad(struct mtd_info *mtd, loff_t ofs) { struct mtd_part *part = mtd_to_part(mtd); int res; ofs += part->offset; res = part->parent->_block_markbad(part->parent, ofs); if (!res) mtd->ecc_stats.badblocks++; return res; }

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PersonTokensPropCommitsCommitProp
David Woodhouse3657.14%120.00%
Thomas Gleixner2031.75%120.00%
Mike Dunn46.35%120.00%
Rafał Miłecki23.17%120.00%
Brian Norris11.59%120.00%
Total63100.00%5100.00%


static int part_get_device(struct mtd_info *mtd) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_get_device(part->parent); }

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Richard Weinberger3193.94%150.00%
Rafał Miłecki26.06%150.00%
Total33100.00%2100.00%


static void part_put_device(struct mtd_info *mtd) { struct mtd_part *part = mtd_to_part(mtd); part->parent->_put_device(part->parent); }

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Richard Weinberger3093.75%150.00%
Rafał Miłecki26.25%150.00%
Total32100.00%2100.00%


static int part_ooblayout_ecc(struct mtd_info *mtd, int section, struct mtd_oob_region *oobregion) { struct mtd_part *part = mtd_to_part(mtd); return mtd_ooblayout_ecc(part->parent, section, oobregion); }

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Boris Brezillon4097.56%150.00%
Rafał Miłecki12.44%150.00%
Total41100.00%2100.00%


static int part_ooblayout_free(struct mtd_info *mtd, int section, struct mtd_oob_region *oobregion) { struct mtd_part *part = mtd_to_part(mtd); return mtd_ooblayout_free(part->parent, section, oobregion); }

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Boris Brezillon4097.56%150.00%
Rafał Miłecki12.44%150.00%
Total41100.00%2100.00%

static const struct mtd_ooblayout_ops part_ooblayout_ops = { .ecc = part_ooblayout_ecc, .free = part_ooblayout_free, };
static int part_max_bad_blocks(struct mtd_info *mtd, loff_t ofs, size_t len) { struct mtd_part *part = mtd_to_part(mtd); return part->parent->_max_bad_blocks(part->parent, ofs + part->offset, len); }

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Jeff Westfahl4595.74%150.00%
Rafał Miłecki24.26%150.00%
Total47100.00%2100.00%


static inline void free_partition(struct mtd_part *p) { kfree(p->mtd.name); kfree(p); }

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Roman Tereshonkov26100.00%1100.00%
Total26100.00%1100.00%

/** * mtd_parse_part - parse MTD partition looking for subpartitions * * @slave: part that is supposed to be a container and should be parsed * @types: NULL-terminated array with names of partition parsers to try * * Some partitions are kind of containers with extra subpartitions (volumes). * There can be various formats of such containers. This function tries to use * specified parsers to analyze given partition and registers found * subpartitions on success. */
static int mtd_parse_part(struct mtd_part *slave, const char *const *types) { struct mtd_partitions parsed; int err; err = parse_mtd_partitions(&slave->mtd, types, &parsed, NULL); if (err) return err; else if (!parsed.nr_parts) return -ENOENT; err = add_mtd_partitions(&slave->mtd, parsed.parts, parsed.nr_parts); mtd_part_parser_cleanup(&parsed); return err; }

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Rafał Miłecki88100.00%1100.00%
Total88100.00%1100.00%


static struct mtd_part *allocate_partition(struct mtd_info *parent, const struct mtd_partition *part, int partno, uint64_t cur_offset) { int wr_alignment = (parent->flags & MTD_NO_ERASE) ? parent->writesize : parent->erasesize; struct mtd_part *slave; u32 remainder; char *name; u64 tmp; /* allocate the partition structure */ slave = kzalloc(sizeof(*slave), GFP_KERNEL); name = kstrdup(part->name, GFP_KERNEL); if (!name || !slave) { printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n", parent->name); kfree(name); kfree(slave); return ERR_PTR(-ENOMEM); } /* set up the MTD object for this partition */ slave->mtd.type = parent->type; slave->mtd.flags = parent->flags & ~part->mask_flags; slave->mtd.size = part->size; slave->mtd.writesize = parent->writesize; slave->mtd.writebufsize = parent->writebufsize; slave->mtd.oobsize = parent->oobsize; slave->mtd.oobavail = parent->oobavail; slave->mtd.subpage_sft = parent->subpage_sft; slave->mtd.pairing = parent->pairing; slave->mtd.name = name; slave->mtd.owner = parent->owner; /* NOTE: Historically, we didn't arrange MTDs as a tree out of * concern for showing the same data in multiple partitions. * However, it is very useful to have the master node present, * so the MTD_PARTITIONED_MASTER option allows that. The master * will have device nodes etc only if this is set, so make the * parent conditional on that option. Note, this is a way to * distinguish between the master and the partition in sysfs. */ slave->mtd.dev.parent = IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) || mtd_is_partition(parent) ? &parent->dev : parent->dev.parent; slave->mtd.dev.of_node = part->of_node; slave->mtd._read = part_read; slave->mtd._write = part_write; if (parent->_panic_write) slave->mtd._panic_write = part_panic_write; if (parent->_point && parent->_unpoint) { slave->mtd._point = part_point; slave->mtd._unpoint = part_unpoint; } if (parent->_get_unmapped_area) slave->mtd._get_unmapped_area = part_get_unmapped_area; if (parent->_read_oob) slave->mtd._read_oob = part_read_oob; if (parent->_write_oob) slave->mtd._write_oob = part_write_oob; if (parent->_read_user_prot_reg) slave->mtd._read_user_prot_reg = part_read_user_prot_reg; if (parent->_read_fact_prot_reg) slave->mtd._read_fact_prot_reg = part_read_fact_prot_reg; if (parent->_write_user_prot_reg) slave->mtd._write_user_prot_reg = part_write_user_prot_reg; if (parent->_lock_user_prot_reg) slave->mtd._lock_user_prot_reg = part_lock_user_prot_reg; if (parent->_get_user_prot_info) slave->mtd._get_user_prot_info = part_get_user_prot_info; if (parent->_get_fact_prot_info) slave->mtd._get_fact_prot_info = part_get_fact_prot_info; if (parent->_sync) slave->mtd._sync = part_sync; if (!partno && !parent->dev.class && parent->_suspend && parent->_resume) { slave->mtd._suspend = part_suspend; slave->mtd._resume = part_resume; } if (parent->_writev) slave->mtd._writev = part_writev; if (parent->_lock) slave->mtd._lock = part_lock; if (parent->_unlock) slave->mtd._unlock = part_unlock; if (parent->_is_locked) slave->mtd._is_locked = part_is_locked; if (parent->_block_isreserved) slave->mtd._block_isreserved = part_block_isreserved; if (parent->_block_isbad) slave->mtd._block_isbad = part_block_isbad; if (parent->_block_markbad) slave->mtd._block_markbad = part_block_markbad; if (parent->_max_bad_blocks) slave->mtd._max_bad_blocks = part_max_bad_blocks; if (parent->_get_device) slave->mtd._get_device = part_get_device; if (parent->_put_device) slave->mtd._put_device = part_put_device; slave->mtd._erase = part_erase; slave->parent = parent; slave->offset = part->offset; if (slave->offset == MTDPART_OFS_APPEND) slave->offset = cur_offset; if (slave->offset == MTDPART_OFS_NXTBLK) { tmp = cur_offset; slave->offset = cur_offset; remainder = do_div(tmp, wr_alignment); if (remainder) { slave->offset += wr_alignment - remainder; printk(KERN_NOTICE "Moving partition %d: " "0x%012llx -> 0x%012llx\n", partno, (unsigned long long)cur_offset, (unsigned long long)slave->offset); } } if (slave->offset == MTDPART_OFS_RETAIN) { slave->offset = cur_offset; if (parent->size - slave->offset >= slave->mtd.size) { slave->mtd.size = parent->size - slave->offset - slave->mtd.size; } else { printk(KERN_ERR "mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n", part->name, parent->size - slave->offset, slave->mtd.size); /* register to preserve ordering */ goto out_register; } } if (slave->mtd.size == MTDPART_SIZ_FULL) slave->mtd.size = parent->size - slave->offset; printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset, (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name); /* let's do some sanity checks */ if (slave->offset >= parent->size) { /* let's register it anyway to preserve ordering */ slave->offset = 0; slave->mtd.size = 0; printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n", part->name); goto out_register; } if (slave->offset + slave->mtd.size > parent->size) { slave->mtd.size = parent->size - slave->offset; printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n", part->name, parent->name, (unsigned long long)slave->mtd.size); } if (parent->numeraseregions > 1) { /* Deal with variable erase size stuff */ int i, max = parent->numeraseregions; u64 end = slave->offset + slave->mtd.size; struct mtd_erase_region_info *regions = parent->eraseregions; /* Find the first erase regions which is part of this * partition. */ for (i = 0; i < max && regions[i].offset <= slave->offset; i++) ; /* The loop searched for the region _behind_ the first one */ if (i > 0) i--; /* Pick biggest erasesize */ for (; i < max && regions[i].offset < end; i++) { if (slave->mtd.erasesize < regions[i].erasesize) { slave->mtd.erasesize = regions[i].erasesize; } } BUG_ON(slave->mtd.erasesize == 0); } else { /* Single erase size */ slave->mtd.erasesize = parent->erasesize; } /* * Slave erasesize might differ from the master one if the master * exposes several regions with different erasesize. Adjust * wr_alignment accordingly. */ if (!(slave->mtd.flags & MTD_NO_ERASE)) wr_alignment = slave->mtd.erasesize; tmp = slave->offset; remainder = do_div(tmp, wr_alignment); if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) { /* Doesn't start on a boundary of major erase size */ /* FIXME: Let it be writable if it is on a boundary of * _minor_ erase size though */ slave->mtd.flags &= ~MTD_WRITEABLE; printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n", part->name); } tmp = slave->mtd.size; remainder = do_div(tmp, wr_alignment); if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) { slave->mtd.flags &= ~MTD_WRITEABLE; printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n", part->name); } mtd_set_ooblayout(&slave->mtd, &part_ooblayout_ops); slave->mtd.ecc_step_size = parent->ecc_step_size; slave->mtd.ecc_strength = parent->ecc_strength; slave->mtd.bitflip_threshold = parent->bitflip_threshold; if (parent->_block_isbad) { uint64_t offs = 0; while (offs < slave->mtd.size) { if (mtd_block_isreserved(parent, offs + slave->offset)) slave->mtd.ecc_stats.bbtblocks++; else if (mtd_block_isbad(parent, offs + slave->offset)) slave->mtd.ecc_stats.badblocks++; offs += slave->mtd.erasesize; } } out_register: return slave; }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse43330.77%36.82%
Linus Torvalds (pre-git)16411.66%12.27%
Atsushi Nemoto876.18%49.09%
Dmitry Baryshkov825.83%12.27%
Chris Packham755.33%12.27%
Rafał Miłecki674.76%24.55%
Thomas Gleixner574.05%24.55%
Linus Torvalds543.84%24.55%
Artem B. Bityutskiy513.62%36.82%
Boris Brezillon382.70%49.09%
Adrian Hunter362.56%12.27%
Ezequiel García352.49%24.55%
Nico Pitre332.35%12.27%
Roman Tereshonkov302.13%12.27%
Richard Weinberger261.85%12.27%
Mike Dunn181.28%24.55%
David Howells151.07%12.27%
David Brownell130.92%12.27%
Jeff Westfahl130.92%12.27%
Sascha Hauer120.85%12.27%
Richard Purdie110.78%12.27%
Richard Cochran110.78%12.27%
Dan Ehrenberg100.71%12.27%
Anatolij Gustschin90.64%12.27%
Vitaly Wool90.64%12.27%
Huang Shijie90.64%12.27%
Roel Kluin60.43%12.27%
Jörn Engel20.14%12.27%
Burman Yan10.07%12.27%
Total1407100.00%44100.00%


static ssize_t mtd_partition_offset_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mtd_info *mtd = dev_get_drvdata(dev); struct mtd_part *part = mtd_to_part(mtd); return snprintf(buf, PAGE_SIZE, "%lld\n", part->offset); }

Contributors

PersonTokensPropCommitsCommitProp
Dan Ehrenberg5398.15%150.00%
Brian Norris11.85%150.00%
Total54100.00%2100.00%

static DEVICE_ATTR(offset, S_IRUGO, mtd_partition_offset_show, NULL); static const struct attribute *mtd_partition_attrs[] = { &dev_attr_offset.attr, NULL };
static int mtd_add_partition_attrs(struct mtd_part *new) { int ret = sysfs_create_files(&new->mtd.dev.kobj, mtd_partition_attrs); if (ret) printk(KERN_WARNING "mtd: failed to create partition attrs, err=%d\n", ret); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Dan Ehrenberg43100.00%1100.00%
Total43100.00%1100.00%


int mtd_add_partition(struct mtd_info *parent, const char *name, long long offset, long long length) { struct mtd_partition part; struct mtd_part *new; int ret = 0; /* the direct offset is expected */ if (offset == MTDPART_OFS_APPEND || offset == MTDPART_OFS_NXTBLK) return -EINVAL; if (length == MTDPART_SIZ_FULL) length = parent->size - offset; if (length <= 0) return -EINVAL; memset(&part, 0, sizeof(part)); part.name = name; part.size = length; part.offset = offset; new = allocate_partition(parent, &part, -1, offset); if (IS_ERR(new)) return PTR_ERR(new); mutex_lock(&mtd_partitions_mutex); list_add(&new->list, &mtd_partitions); mutex_unlock(&mtd_partitions_mutex); add_mtd_device(&new->mtd); mtd_add_partition_attrs(new); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Roman Tereshonkov12270.11%116.67%
Atsushi Nemoto3017.24%116.67%
Brian Norris137.47%116.67%
Dan Ehrenberg52.87%116.67%
Rafał Miłecki31.72%116.67%
Geert Uytterhoeven10.57%116.67%
Total174100.00%6100.00%

EXPORT_SYMBOL_GPL(mtd_add_partition); /** * __mtd_del_partition - delete MTD partition * * @priv: internal MTD struct for partition to be deleted * * This function must be called with the partitions mutex locked. */
static int __mtd_del_partition(struct mtd_part *priv) { struct mtd_part *child, *next; int err; list_for_each_entry_safe(child, next, &mtd_partitions, list) { if (child->parent == &priv->mtd) { err = __mtd_del_partition(child); if (err) return err; } } sysfs_remove_files(&priv->mtd.dev.kobj, mtd_partition_attrs); err = del_mtd_device(&priv->mtd); if (err) return err; list_del(&priv->list); free_partition(priv); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Rafał Miłecki108100.00%3100.00%
Total108100.00%3100.00%

/* * This function unregisters and destroy all slave MTD objects which are * attached to the given MTD object. */
int del_mtd_partitions(struct mtd_info *mtd) { struct mtd_part *slave, *next; int ret, err = 0; mutex_lock(&mtd_partitions_mutex); list_for_each_entry_safe(slave, next, &mtd_partitions, list) if (slave->parent == mtd) { ret = __mtd_del_partition(slave); if (ret < 0) err = ret; } mutex_unlock(&mtd_partitions_mutex); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Rafał Miłecki77100.00%3100.00%
Total77100.00%3100.00%


int mtd_del_partition(struct mtd_info *mtd, int partno) { struct mtd_part *slave, *next; int ret = -EINVAL; mutex_lock(&mtd_partitions_mutex); list_for_each_entry_safe(slave, next, &mtd_partitions, list) if ((slave->parent == mtd) && (slave->mtd.index == partno)) { ret = __mtd_del_partition(slave); break; } mutex_unlock(&mtd_partitions_mutex); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Roman Tereshonkov7895.12%125.00%
Rafał Miłecki44.88%375.00%
Total82100.00%4100.00%

EXPORT_SYMBOL_GPL(mtd_del_partition); /* * This function, given a master MTD object and a partition table, creates * and registers slave MTD objects which are bound to the master according to * the partition definitions. * * For historical reasons, this function's caller only registers the master * if the MTD_PARTITIONED_MASTER config option is set. */
int add_mtd_partitions(struct mtd_info *master, const struct mtd_partition *parts, int nbparts) { struct mtd_part *slave; uint64_t cur_offset = 0; int i; printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name); for (i = 0; i < nbparts; i++) { slave = allocate_partition(master, parts + i, i, cur_offset); if (IS_ERR(slave)) { del_mtd_partitions(master); return PTR_ERR(slave); } mutex_lock(&mtd_partitions_mutex); list_add(&slave->list, &mtd_partitions); mutex_unlock(&mtd_partitions_mutex); add_mtd_device(&slave->mtd); mtd_add_partition_attrs(slave); if (parts[i].types) mtd_parse_part(slave, parts[i].types); cur_offset = slave->offset + slave->mtd.size; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Roman Tereshonkov11569.28%114.29%
Rafał Miłecki2112.65%114.29%
Atsushi Nemoto137.83%114.29%
Boris Brezillon74.22%114.29%
Dan Ehrenberg53.01%114.29%
David Woodhouse42.41%114.29%
Linus Torvalds (pre-git)10.60%114.29%
Total166100.00%7100.00%

static DEFINE_SPINLOCK(part_parser_lock); static LIST_HEAD(part_parsers);
static struct mtd_part_parser *mtd_part_parser_get(const char *name) { struct mtd_part_parser *p, *ret = NULL; spin_lock(&part_parser_lock); list_for_each_entry(p, &part_parsers, list) if (!strcmp(p->name, name) && try_module_get(p->owner)) { ret = p; break; } spin_unlock(&part_parser_lock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse6083.33%233.33%
Chris Malley68.33%116.67%
Linus Torvalds34.17%116.67%
Linus Torvalds (pre-git)22.78%116.67%
Brian Norris11.39%116.67%
Total72100.00%6100.00%


static inline void mtd_part_parser_put(const struct mtd_part_parser *p) { module_put(p->owner); }

Contributors

PersonTokensPropCommitsCommitProp
Brian Norris1785.00%150.00%
Dmitry Baryshkov315.00%150.00%
Total20100.00%2100.00%

/* * Many partition parsers just expected the core to kfree() all their data in * one chunk. Do that by default. */
static void mtd_part_parser_cleanup_default(const struct mtd_partition *pparts, int nr_parts) { kfree(pparts); }

Contributors

PersonTokensPropCommitsCommitProp
Brian Norris20100.00%1100.00%
Total20100.00%1100.00%


int __register_mtd_parser(struct mtd_part_parser *p, struct module *owner) { p->owner = owner; if (!p->cleanup) p->cleanup = &mtd_part_parser_cleanup_default; spin_lock(&part_parser_lock); list_add(&p->list, &part_parsers); spin_unlock(&part_parser_lock); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse3150.82%133.33%
Brian Norris3049.18%266.67%
Total61100.00%3100.00%

EXPORT_SYMBOL_GPL(__register_mtd_parser);
void deregister_mtd_parser(struct mtd_part_parser *p) { spin_lock(&part_parser_lock); list_del(&p->list); spin_unlock(&part_parser_lock); }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse2996.67%150.00%
Axel Lin13.33%150.00%
Total30100.00%2100.00%

EXPORT_SYMBOL_GPL(deregister_mtd_parser); /* * Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you * are changing this array! */ static const char * const default_mtd_part_types[] = { "cmdlinepart", "ofpart", NULL };
static int mtd_part_do_parse(struct mtd_part_parser *parser, struct mtd_info *master, struct mtd_partitions *pparts, struct mtd_part_parser_data *data) { int ret; ret = (*parser->parse_fn)(master, &pparts->parts, data); pr_debug("%s: parser %s: %i\n", master->name, parser->name, ret); if (ret <= 0) return ret; pr_notice("%d %s partitions found on MTD device %s\n", ret, parser->name, master->name); pparts->nr_parts = ret; pparts->parser = parser; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Brian Norris102100.00%1100.00%
Total102100.00%1100.00%

/** * parse_mtd_partitions - parse MTD partitions * @master: the master partition (describes whole MTD device) * @types: names of partition parsers to try or %NULL * @pparts: info about partitions found is returned here * @data: MTD partition parser-specific data * * This function tries to find partition on MTD device @master. It uses MTD * partition parsers, specified in @types. However, if @types is %NULL, then * the default list of parsers is used. The default list contains only the * "cmdlinepart" and "ofpart" parsers ATM. * Note: If there are more then one parser in @types, the kernel only takes the * partitions parsed out by the first parser. * * This function may return: * o a negative error code in case of failure * o zero otherwise, and @pparts will describe the partitions, number of * partitions, and the parser which parsed them. Caller must release * resources with mtd_part_parser_cleanup() when finished with the returned * data. */
int parse_mtd_partitions(struct mtd_info *master, const char *const *types, struct mtd_partitions *pparts, struct mtd_part_parser_data *data) { struct mtd_part_parser *parser; int ret, err = 0; if (!types) types = default_mtd_part_types; for ( ; *types; types++) { pr_debug("%s: parsing partitions %s\n", master->name, *types); parser = mtd_part_parser_get(*types); if (!parser && !request_module("%s", *types)) parser = mtd_part_parser_get(*types); pr_debug("%s: got parser %s\n", master->name, parser ? parser->name : NULL); if (!parser) continue; ret = mtd_part_do_parse(parser, master, pparts, data); /* Found partitions! */ if (ret > 0) return 0; mtd_part_parser_put(parser); /* * Stash the first error we see; only report it if no parser * succeeds */ if (ret < 0 && !err) err = ret; } return err; }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse6538.46%18.33%
Brian Norris3218.93%541.67%
Michal Suchanek2917.16%18.33%
Linus Torvalds2112.43%18.33%
Dmitry Baryshkov148.28%216.67%
Linus Torvalds (pre-git)74.14%18.33%
Artem B. Bityutskiy10.59%18.33%
Total169100.00%12100.00%


void mtd_part_parser_cleanup(struct mtd_partitions *parts) { const struct mtd_part_parser *parser; if (!parts) return; parser = parts->parser; if (parser) { if (parser->cleanup) parser->cleanup(parts->parts, parts->nr_parts); mtd_part_parser_put(parser); } }

Contributors

PersonTokensPropCommitsCommitProp
Brian Norris58100.00%1100.00%
Total58100.00%1100.00%


int mtd_is_partition(const struct mtd_info *mtd) { struct mtd_part *part; int ispart = 0; mutex_lock(&mtd_partitions_mutex); list_for_each_entry(part, &mtd_partitions, list) if (&part->mtd == mtd) { ispart = 1; break; } mutex_unlock(&mtd_partitions_mutex); return ispart; }

Contributors

PersonTokensPropCommitsCommitProp
Roman Tereshonkov5998.33%266.67%
Richard Genoud11.67%133.33%
Total60100.00%3100.00%

EXPORT_SYMBOL_GPL(mtd_is_partition); /* Returns the size of the entire flash chip */
uint64_t mtd_get_device_size(const struct mtd_info *mtd) { if (!mtd_is_partition(mtd)) return mtd->size; return mtd_get_device_size(mtd_to_part(mtd)->parent); }

Contributors

PersonTokensPropCommitsCommitProp
Richard Genoud3085.71%125.00%
Rafał Miłecki411.43%250.00%
Brian Norris12.86%125.00%
Total35100.00%4100.00%

EXPORT_SYMBOL_GPL(mtd_get_device_size);

Overall Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse120224.74%77.53%
Roman Tereshonkov4549.35%22.15%
Linus Torvalds (pre-git)4549.35%11.08%
Rafał Miłecki4389.02%55.38%
Brian Norris3376.94%99.68%
Thomas Gleixner1713.52%55.38%
Boris Brezillon1483.05%66.45%
Dan Ehrenberg1463.01%22.15%
Atsushi Nemoto1392.86%44.30%
Nico Pitre1352.78%11.08%
Linus Torvalds1292.66%33.23%
Mike Dunn1232.53%44.30%
Dmitry Baryshkov1142.35%55.38%
Artem B. Bityutskiy1142.35%88.60%
Richard Weinberger871.79%11.08%
Ezequiel García761.56%22.15%
Chris Packham751.54%11.08%
Adrian Hunter701.44%33.23%
David Howells661.36%11.08%
Richard Purdie641.32%11.08%
Jeff Westfahl581.19%11.08%
Richard Cochran511.05%11.08%
Richard Genoud370.76%22.15%
Yauhen Kharuzhy290.60%11.08%
Michal Suchanek290.60%11.08%
Christian Riesch220.45%11.08%
Vitaly Wool170.35%22.15%
David Brownell130.27%11.08%
Sascha Hauer120.25%11.08%
Huang Shijie90.19%11.08%
Jared Hulbert90.19%11.08%
Anatolij Gustschin90.19%11.08%
Roel Kluin60.12%11.08%
Chris Malley60.12%11.08%
Jamie Iles30.06%11.08%
Jörn Engel20.04%11.08%
Axel Lin10.02%11.08%
Burman Yan10.02%11.08%
Al Viro10.02%11.08%
Geert Uytterhoeven10.02%11.08%
Total4858100.00%93100.00%
Directory: drivers/mtd
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