[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/fs/efs/dir.c b/ap/os/linux/linux-3.4.x/fs/efs/dir.c
new file mode 100644
index 0000000..7ee6f7e
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/efs/dir.c
@@ -0,0 +1,110 @@
+/*
+ * dir.c
+ *
+ * Copyright (c) 1999 Al Smith
+ */
+
+#include <linux/buffer_head.h>
+#include "efs.h"
+
+static int efs_readdir(struct file *, void *, filldir_t);
+
+const struct file_operations efs_dir_operations = {
+ .llseek = generic_file_llseek,
+ .read = generic_read_dir,
+ .readdir = efs_readdir,
+};
+
+const struct inode_operations efs_dir_inode_operations = {
+ .lookup = efs_lookup,
+};
+
+static int efs_readdir(struct file *filp, void *dirent, filldir_t filldir) {
+ struct inode *inode = filp->f_path.dentry->d_inode;
+ struct buffer_head *bh;
+
+ struct efs_dir *dirblock;
+ struct efs_dentry *dirslot;
+ efs_ino_t inodenum;
+ efs_block_t block;
+ int slot, namelen;
+ char *nameptr;
+
+ if (inode->i_size & (EFS_DIRBSIZE-1))
+ printk(KERN_WARNING "EFS: WARNING: readdir(): directory size not a multiple of EFS_DIRBSIZE\n");
+
+ /* work out where this entry can be found */
+ block = filp->f_pos >> EFS_DIRBSIZE_BITS;
+
+ /* each block contains at most 256 slots */
+ slot = filp->f_pos & 0xff;
+
+ /* look at all blocks */
+ while (block < inode->i_blocks) {
+ /* read the dir block */
+ bh = sb_bread(inode->i_sb, efs_bmap(inode, block));
+
+ if (!bh) {
+ printk(KERN_ERR "EFS: readdir(): failed to read dir block %d\n", block);
+ break;
+ }
+
+ dirblock = (struct efs_dir *) bh->b_data;
+
+ if (be16_to_cpu(dirblock->magic) != EFS_DIRBLK_MAGIC) {
+ printk(KERN_ERR "EFS: readdir(): invalid directory block\n");
+ brelse(bh);
+ break;
+ }
+
+ while (slot < dirblock->slots) {
+ if (dirblock->space[slot] == 0) {
+ slot++;
+ continue;
+ }
+
+ dirslot = (struct efs_dentry *) (((char *) bh->b_data) + EFS_SLOTAT(dirblock, slot));
+
+ inodenum = be32_to_cpu(dirslot->inode);
+ namelen = dirslot->namelen;
+ nameptr = dirslot->name;
+
+#ifdef DEBUG
+ printk(KERN_DEBUG "EFS: readdir(): block %d slot %d/%d: inode %u, name \"%s\", namelen %u\n", block, slot, dirblock->slots-1, inodenum, nameptr, namelen);
+#endif
+ if (namelen > 0) {
+ /* found the next entry */
+ filp->f_pos = (block << EFS_DIRBSIZE_BITS) | slot;
+
+ /* copy filename and data in dirslot */
+ filldir(dirent, nameptr, namelen, filp->f_pos, inodenum, DT_UNKNOWN);
+
+ /* sanity check */
+ if (nameptr - (char *) dirblock + namelen > EFS_DIRBSIZE) {
+ printk(KERN_WARNING "EFS: directory entry %d exceeds directory block\n", slot);
+ slot++;
+ continue;
+ }
+
+ /* store position of next slot */
+ if (++slot == dirblock->slots) {
+ slot = 0;
+ block++;
+ }
+ brelse(bh);
+ filp->f_pos = (block << EFS_DIRBSIZE_BITS) | slot;
+ goto out;
+ }
+ slot++;
+ }
+ brelse(bh);
+
+ slot = 0;
+ block++;
+ }
+
+ filp->f_pos = (block << EFS_DIRBSIZE_BITS) | slot;
+out:
+ return 0;
+}
+