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Diffstat (limited to 'ANDROID_3.4.5/fs/qnx6/dir.c')
-rw-r--r--ANDROID_3.4.5/fs/qnx6/dir.c291
1 files changed, 0 insertions, 291 deletions
diff --git a/ANDROID_3.4.5/fs/qnx6/dir.c b/ANDROID_3.4.5/fs/qnx6/dir.c
deleted file mode 100644
index dc597353..00000000
--- a/ANDROID_3.4.5/fs/qnx6/dir.c
+++ /dev/null
@@ -1,291 +0,0 @@
-/*
- * QNX6 file system, Linux implementation.
- *
- * Version : 1.0.0
- *
- * History :
- *
- * 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.
- * 16-02-2012 pagemap extension by Al Viro
- *
- */
-
-#include "qnx6.h"
-
-static unsigned qnx6_lfile_checksum(char *name, unsigned size)
-{
- unsigned crc = 0;
- char *end = name + size;
- while (name < end) {
- crc = ((crc >> 1) + *(name++)) ^
- ((crc & 0x00000001) ? 0x80000000 : 0);
- }
- return crc;
-}
-
-static struct page *qnx6_get_page(struct inode *dir, unsigned long n)
-{
- struct address_space *mapping = dir->i_mapping;
- struct page *page = read_mapping_page(mapping, n, NULL);
- if (!IS_ERR(page))
- kmap(page);
- return page;
-}
-
-static inline unsigned long dir_pages(struct inode *inode)
-{
- return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
-}
-
-static unsigned last_entry(struct inode *inode, unsigned long page_nr)
-{
- unsigned long last_byte = inode->i_size;
- last_byte -= page_nr << PAGE_CACHE_SHIFT;
- if (last_byte > PAGE_CACHE_SIZE)
- last_byte = PAGE_CACHE_SIZE;
- return last_byte / QNX6_DIR_ENTRY_SIZE;
-}
-
-static struct qnx6_long_filename *qnx6_longname(struct super_block *sb,
- struct qnx6_long_dir_entry *de,
- struct page **p)
-{
- struct qnx6_sb_info *sbi = QNX6_SB(sb);
- u32 s = fs32_to_cpu(sbi, de->de_long_inode); /* in block units */
- u32 n = s >> (PAGE_CACHE_SHIFT - sb->s_blocksize_bits); /* in pages */
- /* within page */
- u32 offs = (s << sb->s_blocksize_bits) & ~PAGE_CACHE_MASK;
- struct address_space *mapping = sbi->longfile->i_mapping;
- struct page *page = read_mapping_page(mapping, n, NULL);
- if (IS_ERR(page))
- return ERR_CAST(page);
- kmap(*p = page);
- return (struct qnx6_long_filename *)(page_address(page) + offs);
-}
-
-static int qnx6_dir_longfilename(struct inode *inode,
- struct qnx6_long_dir_entry *de,
- void *dirent, loff_t pos,
- unsigned de_inode, filldir_t filldir)
-{
- struct qnx6_long_filename *lf;
- struct super_block *s = inode->i_sb;
- struct qnx6_sb_info *sbi = QNX6_SB(s);
- struct page *page;
- int lf_size;
-
- if (de->de_size != 0xff) {
- /* error - long filename entries always have size 0xff
- in direntry */
- printk(KERN_ERR "qnx6: invalid direntry size (%i).\n",
- de->de_size);
- return 0;
- }
- lf = qnx6_longname(s, de, &page);
- if (IS_ERR(lf)) {
- printk(KERN_ERR "qnx6:Error reading longname\n");
- return 0;
- }
-
- lf_size = fs16_to_cpu(sbi, lf->lf_size);
-
- if (lf_size > QNX6_LONG_NAME_MAX) {
- QNX6DEBUG((KERN_INFO "file %s\n", lf->lf_fname));
- printk(KERN_ERR "qnx6:Filename too long (%i)\n", lf_size);
- qnx6_put_page(page);
- return 0;
- }
-
- /* calc & validate longfilename checksum
- mmi 3g filesystem does not have that checksum */
- if (!test_opt(s, MMI_FS) && fs32_to_cpu(sbi, de->de_checksum) !=
- qnx6_lfile_checksum(lf->lf_fname, lf_size))
- printk(KERN_INFO "qnx6: long filename checksum error.\n");
-
- QNX6DEBUG((KERN_INFO "qnx6_readdir:%.*s inode:%u\n",
- lf_size, lf->lf_fname, de_inode));
- if (filldir(dirent, lf->lf_fname, lf_size, pos, de_inode,
- DT_UNKNOWN) < 0) {
- qnx6_put_page(page);
- return 0;
- }
-
- qnx6_put_page(page);
- /* success */
- return 1;
-}
-
-static int qnx6_readdir(struct file *filp, void *dirent, filldir_t filldir)
-{
- struct inode *inode = filp->f_path.dentry->d_inode;
- struct super_block *s = inode->i_sb;
- struct qnx6_sb_info *sbi = QNX6_SB(s);
- loff_t pos = filp->f_pos & (QNX6_DIR_ENTRY_SIZE - 1);
- unsigned long npages = dir_pages(inode);
- unsigned long n = pos >> PAGE_CACHE_SHIFT;
- unsigned start = (pos & ~PAGE_CACHE_MASK) / QNX6_DIR_ENTRY_SIZE;
- bool done = false;
-
- if (filp->f_pos >= inode->i_size)
- return 0;
-
- for ( ; !done && n < npages; n++, start = 0) {
- struct page *page = qnx6_get_page(inode, n);
- int limit = last_entry(inode, n);
- struct qnx6_dir_entry *de;
- int i = start;
-
- if (IS_ERR(page)) {
- printk(KERN_ERR "qnx6_readdir: read failed\n");
- filp->f_pos = (n + 1) << PAGE_CACHE_SHIFT;
- return PTR_ERR(page);
- }
- de = ((struct qnx6_dir_entry *)page_address(page)) + start;
- for (; i < limit; i++, de++, pos += QNX6_DIR_ENTRY_SIZE) {
- int size = de->de_size;
- u32 no_inode = fs32_to_cpu(sbi, de->de_inode);
-
- if (!no_inode || !size)
- continue;
-
- if (size > QNX6_SHORT_NAME_MAX) {
- /* long filename detected
- get the filename from long filename
- structure / block */
- if (!qnx6_dir_longfilename(inode,
- (struct qnx6_long_dir_entry *)de,
- dirent, pos, no_inode,
- filldir)) {
- done = true;
- break;
- }
- } else {
- QNX6DEBUG((KERN_INFO "qnx6_readdir:%.*s"
- " inode:%u\n", size, de->de_fname,
- no_inode));
- if (filldir(dirent, de->de_fname, size,
- pos, no_inode, DT_UNKNOWN)
- < 0) {
- done = true;
- break;
- }
- }
- }
- qnx6_put_page(page);
- }
- filp->f_pos = pos;
- return 0;
-}
-
-/*
- * check if the long filename is correct.
- */
-static unsigned qnx6_long_match(int len, const char *name,
- struct qnx6_long_dir_entry *de, struct inode *dir)
-{
- struct super_block *s = dir->i_sb;
- struct qnx6_sb_info *sbi = QNX6_SB(s);
- struct page *page;
- int thislen;
- struct qnx6_long_filename *lf = qnx6_longname(s, de, &page);
-
- if (IS_ERR(lf))
- return 0;
-
- thislen = fs16_to_cpu(sbi, lf->lf_size);
- if (len != thislen) {
- qnx6_put_page(page);
- return 0;
- }
- if (memcmp(name, lf->lf_fname, len) == 0) {
- qnx6_put_page(page);
- return fs32_to_cpu(sbi, de->de_inode);
- }
- qnx6_put_page(page);
- return 0;
-}
-
-/*
- * check if the filename is correct.
- */
-static unsigned qnx6_match(struct super_block *s, int len, const char *name,
- struct qnx6_dir_entry *de)
-{
- struct qnx6_sb_info *sbi = QNX6_SB(s);
- if (memcmp(name, de->de_fname, len) == 0)
- return fs32_to_cpu(sbi, de->de_inode);
- return 0;
-}
-
-
-unsigned qnx6_find_entry(int len, struct inode *dir, const char *name,
- struct page **res_page)
-{
- struct super_block *s = dir->i_sb;
- struct qnx6_inode_info *ei = QNX6_I(dir);
- struct page *page = NULL;
- unsigned long start, n;
- unsigned long npages = dir_pages(dir);
- unsigned ino;
- struct qnx6_dir_entry *de;
- struct qnx6_long_dir_entry *lde;
-
- *res_page = NULL;
-
- if (npages == 0)
- return 0;
- start = ei->i_dir_start_lookup;
- if (start >= npages)
- start = 0;
- n = start;
-
- do {
- page = qnx6_get_page(dir, n);
- if (!IS_ERR(page)) {
- int limit = last_entry(dir, n);
- int i;
-
- de = (struct qnx6_dir_entry *)page_address(page);
- for (i = 0; i < limit; i++, de++) {
- if (len <= QNX6_SHORT_NAME_MAX) {
- /* short filename */
- if (len != de->de_size)
- continue;
- ino = qnx6_match(s, len, name, de);
- if (ino)
- goto found;
- } else if (de->de_size == 0xff) {
- /* deal with long filename */
- lde = (struct qnx6_long_dir_entry *)de;
- ino = qnx6_long_match(len,
- name, lde, dir);
- if (ino)
- goto found;
- } else
- printk(KERN_ERR "qnx6: undefined "
- "filename size in inode.\n");
- }
- qnx6_put_page(page);
- }
-
- if (++n >= npages)
- n = 0;
- } while (n != start);
- return 0;
-
-found:
- *res_page = page;
- ei->i_dir_start_lookup = n;
- return ino;
-}
-
-const struct file_operations qnx6_dir_operations = {
- .llseek = generic_file_llseek,
- .read = generic_read_dir,
- .readdir = qnx6_readdir,
- .fsync = generic_file_fsync,
-};
-
-const struct inode_operations qnx6_dir_inode_operations = {
- .lookup = qnx6_lookup,
-};
generated by cgit (git 2.34.1) at 2024-12-20 14:33:43 +0000