Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * QNX6 file system, Linux implementation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Version : 1.0.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * History :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * 16-02-2012 pagemap extension by Al Viro
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include "qnx6.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) static unsigned qnx6_lfile_checksum(char *name, unsigned size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	unsigned crc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	char *end = name + size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	while (name < end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 		crc = ((crc >> 1) + *(name++)) ^
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 			((crc & 0x00000001) ? 0x80000000 : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	return crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) static struct page *qnx6_get_page(struct inode *dir, unsigned long n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	struct address_space *mapping = dir->i_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	struct page *page = read_mapping_page(mapping, n, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	if (!IS_ERR(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 		kmap(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	return page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static unsigned last_entry(struct inode *inode, unsigned long page_nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	unsigned long last_byte = inode->i_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	last_byte -= page_nr << PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	if (last_byte > PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 		last_byte = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	return last_byte / QNX6_DIR_ENTRY_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static struct qnx6_long_filename *qnx6_longname(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 					 struct qnx6_long_dir_entry *de,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 					 struct page **p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	struct qnx6_sb_info *sbi = QNX6_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	u32 s = fs32_to_cpu(sbi, de->de_long_inode); /* in block units */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	u32 n = s >> (PAGE_SHIFT - sb->s_blocksize_bits); /* in pages */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	/* within page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	u32 offs = (s << sb->s_blocksize_bits) & ~PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	struct address_space *mapping = sbi->longfile->i_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	struct page *page = read_mapping_page(mapping, n, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	if (IS_ERR(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		return ERR_CAST(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	kmap(*p = page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	return (struct qnx6_long_filename *)(page_address(page) + offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) static int qnx6_dir_longfilename(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 			struct qnx6_long_dir_entry *de,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 			struct dir_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 			unsigned de_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	struct qnx6_long_filename *lf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	struct super_block *s = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	struct qnx6_sb_info *sbi = QNX6_SB(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	int lf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	if (de->de_size != 0xff) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		/* error - long filename entries always have size 0xff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		   in direntry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		pr_err("invalid direntry size (%i).\n", de->de_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	lf = qnx6_longname(s, de, &page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	if (IS_ERR(lf)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		pr_err("Error reading longname\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	lf_size = fs16_to_cpu(sbi, lf->lf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	if (lf_size > QNX6_LONG_NAME_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		pr_debug("file %s\n", lf->lf_fname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		pr_err("Filename too long (%i)\n", lf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		qnx6_put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	/* calc & validate longfilename checksum
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	   mmi 3g filesystem does not have that checksum */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	if (!test_opt(s, MMI_FS) && fs32_to_cpu(sbi, de->de_checksum) !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 			qnx6_lfile_checksum(lf->lf_fname, lf_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		pr_info("long filename checksum error.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	pr_debug("qnx6_readdir:%.*s inode:%u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		 lf_size, lf->lf_fname, de_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	if (!dir_emit(ctx, lf->lf_fname, lf_size, de_inode, DT_UNKNOWN)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		qnx6_put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	qnx6_put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	/* success */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static int qnx6_readdir(struct file *file, struct dir_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	struct inode *inode = file_inode(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	struct super_block *s = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	struct qnx6_sb_info *sbi = QNX6_SB(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	loff_t pos = ctx->pos & ~(QNX6_DIR_ENTRY_SIZE - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	unsigned long npages = dir_pages(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	unsigned long n = pos >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	unsigned start = (pos & ~PAGE_MASK) / QNX6_DIR_ENTRY_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	bool done = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	ctx->pos = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (ctx->pos >= inode->i_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	for ( ; !done && n < npages; n++, start = 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		struct page *page = qnx6_get_page(inode, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		int limit = last_entry(inode, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		struct qnx6_dir_entry *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		int i = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		if (IS_ERR(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 			pr_err("%s(): read failed\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 			ctx->pos = (n + 1) << PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			return PTR_ERR(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		de = ((struct qnx6_dir_entry *)page_address(page)) + start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		for (; i < limit; i++, de++, ctx->pos += QNX6_DIR_ENTRY_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			int size = de->de_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			u32 no_inode = fs32_to_cpu(sbi, de->de_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			if (!no_inode || !size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			if (size > QNX6_SHORT_NAME_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 				/* long filename detected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 				   get the filename from long filename
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 				   structure / block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 				if (!qnx6_dir_longfilename(inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 					(struct qnx6_long_dir_entry *)de,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 					ctx, no_inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 					done = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 					break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 			} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 				pr_debug("%s():%.*s inode:%u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 					 __func__, size, de->de_fname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 					 no_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 				if (!dir_emit(ctx, de->de_fname, size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 				      no_inode, DT_UNKNOWN)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 					done = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 					break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		qnx6_put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)  * check if the long filename is correct.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static unsigned qnx6_long_match(int len, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			struct qnx6_long_dir_entry *de, struct inode *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	struct super_block *s = dir->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	struct qnx6_sb_info *sbi = QNX6_SB(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	int thislen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	struct qnx6_long_filename *lf = qnx6_longname(s, de, &page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	if (IS_ERR(lf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	thislen = fs16_to_cpu(sbi, lf->lf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	if (len != thislen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		qnx6_put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	if (memcmp(name, lf->lf_fname, len) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		qnx6_put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		return fs32_to_cpu(sbi, de->de_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	qnx6_put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)  * check if the filename is correct.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static unsigned qnx6_match(struct super_block *s, int len, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 			struct qnx6_dir_entry *de)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	struct qnx6_sb_info *sbi = QNX6_SB(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	if (memcmp(name, de->de_fname, len) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		return fs32_to_cpu(sbi, de->de_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) unsigned qnx6_find_entry(int len, struct inode *dir, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 			 struct page **res_page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	struct super_block *s = dir->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	struct qnx6_inode_info *ei = QNX6_I(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	struct page *page = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	unsigned long start, n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	unsigned long npages = dir_pages(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	unsigned ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	struct qnx6_dir_entry *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	struct qnx6_long_dir_entry *lde;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	*res_page = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	if (npages == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	start = ei->i_dir_start_lookup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	if (start >= npages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	n = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		page = qnx6_get_page(dir, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		if (!IS_ERR(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 			int limit = last_entry(dir, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 			int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			de = (struct qnx6_dir_entry *)page_address(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 			for (i = 0; i < limit; i++, de++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 				if (len <= QNX6_SHORT_NAME_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 					/* short filename */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 					if (len != de->de_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 						continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 					ino = qnx6_match(s, len, name, de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 					if (ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 						goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 				} else if (de->de_size == 0xff) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 					/* deal with long filename */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 					lde = (struct qnx6_long_dir_entry *)de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 					ino = qnx6_long_match(len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 								name, lde, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 					if (ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 						goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 				} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 					pr_err("undefined filename size in inode.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			qnx6_put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		if (++n >= npages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 			n = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	} while (n != start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) found:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	*res_page = page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	ei->i_dir_start_lookup = n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	return ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) const struct file_operations qnx6_dir_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	.llseek		= generic_file_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	.read		= generic_read_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	.iterate_shared	= qnx6_readdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	.fsync		= generic_file_fsync,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) const struct inode_operations qnx6_dir_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	.lookup		= qnx6_lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) };