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6112bad79f
There is a regular need in the kernel to provide a way to declare having a dynamically sized set of trailing elements in a structure. Kernel code should always use “flexible array members”[1] for these cases. The older style of one-element or zero-length arrays should no longer be used[2]. [1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://github.com/KSPP/linux/issues/21 Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
214 lines
6.3 KiB
C
214 lines
6.3 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
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* Zoltan Sogor <weth@inf.u-szeged.hu>,
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* Patrik Kluba <pajko@halom.u-szeged.hu>,
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* University of Szeged, Hungary
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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*/
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#ifndef JFFS2_SUMMARY_H
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#define JFFS2_SUMMARY_H
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/* Limit summary size to 64KiB so that we can kmalloc it. If the summary
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is larger than that, we have to just ditch it and avoid using summary
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for the eraseblock in question... and it probably doesn't hurt us much
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anyway. */
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#define MAX_SUMMARY_SIZE 65536
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#include <linux/uio.h>
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#include <linux/jffs2.h>
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#define BLK_STATE_ALLFF 0
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#define BLK_STATE_CLEAN 1
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#define BLK_STATE_PARTDIRTY 2
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#define BLK_STATE_CLEANMARKER 3
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#define BLK_STATE_ALLDIRTY 4
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#define BLK_STATE_BADBLOCK 5
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#define JFFS2_SUMMARY_NOSUM_SIZE 0xffffffff
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#define JFFS2_SUMMARY_INODE_SIZE (sizeof(struct jffs2_sum_inode_flash))
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#define JFFS2_SUMMARY_DIRENT_SIZE(x) (sizeof(struct jffs2_sum_dirent_flash) + (x))
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#define JFFS2_SUMMARY_XATTR_SIZE (sizeof(struct jffs2_sum_xattr_flash))
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#define JFFS2_SUMMARY_XREF_SIZE (sizeof(struct jffs2_sum_xref_flash))
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/* Summary structures used on flash */
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struct jffs2_sum_unknown_flash
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{
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jint16_t nodetype; /* node type */
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};
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struct jffs2_sum_inode_flash
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{
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jint16_t nodetype; /* node type */
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jint32_t inode; /* inode number */
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jint32_t version; /* inode version */
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jint32_t offset; /* offset on jeb */
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jint32_t totlen; /* record length */
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} __attribute__((packed));
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struct jffs2_sum_dirent_flash
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{
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jint16_t nodetype; /* == JFFS_NODETYPE_DIRENT */
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jint32_t totlen; /* record length */
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jint32_t offset; /* offset on jeb */
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jint32_t pino; /* parent inode */
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jint32_t version; /* dirent version */
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jint32_t ino; /* == zero for unlink */
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uint8_t nsize; /* dirent name size */
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uint8_t type; /* dirent type */
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uint8_t name[]; /* dirent name */
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} __attribute__((packed));
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struct jffs2_sum_xattr_flash
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{
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jint16_t nodetype; /* == JFFS2_NODETYPE_XATR */
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jint32_t xid; /* xattr identifier */
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jint32_t version; /* version number */
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jint32_t offset; /* offset on jeb */
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jint32_t totlen; /* node length */
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} __attribute__((packed));
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struct jffs2_sum_xref_flash
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{
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jint16_t nodetype; /* == JFFS2_NODETYPE_XREF */
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jint32_t offset; /* offset on jeb */
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} __attribute__((packed));
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union jffs2_sum_flash
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{
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struct jffs2_sum_unknown_flash u;
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struct jffs2_sum_inode_flash i;
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struct jffs2_sum_dirent_flash d;
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struct jffs2_sum_xattr_flash x;
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struct jffs2_sum_xref_flash r;
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};
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/* Summary structures used in the memory */
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struct jffs2_sum_unknown_mem
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{
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union jffs2_sum_mem *next;
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jint16_t nodetype; /* node type */
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};
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struct jffs2_sum_inode_mem
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{
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union jffs2_sum_mem *next;
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jint16_t nodetype; /* node type */
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jint32_t inode; /* inode number */
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jint32_t version; /* inode version */
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jint32_t offset; /* offset on jeb */
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jint32_t totlen; /* record length */
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} __attribute__((packed));
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struct jffs2_sum_dirent_mem
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{
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union jffs2_sum_mem *next;
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jint16_t nodetype; /* == JFFS_NODETYPE_DIRENT */
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jint32_t totlen; /* record length */
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jint32_t offset; /* ofset on jeb */
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jint32_t pino; /* parent inode */
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jint32_t version; /* dirent version */
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jint32_t ino; /* == zero for unlink */
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uint8_t nsize; /* dirent name size */
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uint8_t type; /* dirent type */
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uint8_t name[]; /* dirent name */
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} __attribute__((packed));
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struct jffs2_sum_xattr_mem
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{
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union jffs2_sum_mem *next;
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jint16_t nodetype;
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jint32_t xid;
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jint32_t version;
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jint32_t offset;
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jint32_t totlen;
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} __attribute__((packed));
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struct jffs2_sum_xref_mem
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{
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union jffs2_sum_mem *next;
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jint16_t nodetype;
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jint32_t offset;
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} __attribute__((packed));
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union jffs2_sum_mem
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{
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struct jffs2_sum_unknown_mem u;
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struct jffs2_sum_inode_mem i;
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struct jffs2_sum_dirent_mem d;
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struct jffs2_sum_xattr_mem x;
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struct jffs2_sum_xref_mem r;
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};
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/* Summary related information stored in superblock */
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struct jffs2_summary
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{
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uint32_t sum_size; /* collected summary information for nextblock */
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uint32_t sum_num;
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uint32_t sum_padded;
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union jffs2_sum_mem *sum_list_head;
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union jffs2_sum_mem *sum_list_tail;
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jint32_t *sum_buf; /* buffer for writing out summary */
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};
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/* Summary marker is stored at the end of every sumarized erase block */
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struct jffs2_sum_marker
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{
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jint32_t offset; /* offset of the summary node in the jeb */
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jint32_t magic; /* == JFFS2_SUM_MAGIC */
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};
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#define JFFS2_SUMMARY_FRAME_SIZE (sizeof(struct jffs2_raw_summary) + sizeof(struct jffs2_sum_marker))
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#ifdef CONFIG_JFFS2_SUMMARY /* SUMMARY SUPPORT ENABLED */
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#define jffs2_sum_active() (1)
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int jffs2_sum_init(struct jffs2_sb_info *c);
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void jffs2_sum_exit(struct jffs2_sb_info *c);
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void jffs2_sum_disable_collecting(struct jffs2_summary *s);
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int jffs2_sum_is_disabled(struct jffs2_summary *s);
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void jffs2_sum_reset_collected(struct jffs2_summary *s);
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void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s);
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int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
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unsigned long count, uint32_t to);
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int jffs2_sum_write_sumnode(struct jffs2_sb_info *c);
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int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size);
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int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, uint32_t ofs);
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int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, uint32_t ofs);
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int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs);
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int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs);
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int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
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struct jffs2_raw_summary *summary, uint32_t sumlen,
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uint32_t *pseudo_random);
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#else /* SUMMARY DISABLED */
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#define jffs2_sum_active() (0)
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#define jffs2_sum_init(a) (0)
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#define jffs2_sum_exit(a)
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#define jffs2_sum_disable_collecting(a)
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#define jffs2_sum_is_disabled(a) (0)
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#define jffs2_sum_reset_collected(a)
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#define jffs2_sum_add_kvec(a,b,c,d) (0)
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#define jffs2_sum_move_collected(a,b)
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#define jffs2_sum_write_sumnode(a) (0)
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#define jffs2_sum_add_padding_mem(a,b)
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#define jffs2_sum_add_inode_mem(a,b,c)
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#define jffs2_sum_add_dirent_mem(a,b,c)
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#define jffs2_sum_add_xattr_mem(a,b,c)
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#define jffs2_sum_add_xref_mem(a,b,c)
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#define jffs2_sum_scan_sumnode(a,b,c,d,e) (0)
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#endif /* CONFIG_JFFS2_SUMMARY */
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#endif /* JFFS2_SUMMARY_H */
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