init android origin source code

1 files changed, 319 insertions, 0 deletions

diff --git a/ANDROID_3.4.5/fs/reiserfs/dir.c b/ANDROID_3.4.5/fs/reiserfs/dir.c
new file mode 100644
index 00000000..66c53b64
--- /dev/null
+++ b/ANDROID_3.4.5/fs/reiserfs/dir.c
@@ -0,0 +1,319 @@
+/*
+ * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
+ */
+
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include "reiserfs.h"
+#include <linux/stat.h>
+#include <linux/buffer_head.h>
+#include <linux/slab.h>
+#include <asm/uaccess.h>
+
+extern const struct reiserfs_key MIN_KEY;
+
+static int reiserfs_readdir(struct file *, void *, filldir_t);
+static int reiserfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
+			      int datasync);
+
+const struct file_operations reiserfs_dir_operations = {
+	.llseek = generic_file_llseek,
+	.read = generic_read_dir,
+	.readdir = reiserfs_readdir,
+	.fsync = reiserfs_dir_fsync,
+	.unlocked_ioctl = reiserfs_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = reiserfs_compat_ioctl,
+#endif
+};
+
+static int reiserfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
+			      int datasync)
+{
+	struct inode *inode = filp->f_mapping->host;
+	int err;
+
+	err = filemap_write_and_wait_range(inode->i_mapping, start, end);
+	if (err)
+		return err;
+
+	mutex_lock(&inode->i_mutex);
+	reiserfs_write_lock(inode->i_sb);
+	err = reiserfs_commit_for_inode(inode);
+	reiserfs_write_unlock(inode->i_sb);
+	mutex_unlock(&inode->i_mutex);
+	if (err < 0)
+		return err;
+	return 0;
+}
+
+#define store_ih(where,what) copy_item_head (where, what)
+
+static inline bool is_privroot_deh(struct dentry *dir,
+				   struct reiserfs_de_head *deh)
+{
+	struct dentry *privroot = REISERFS_SB(dir->d_sb)->priv_root;
+	return (dir == dir->d_parent && privroot->d_inode &&
+	        deh->deh_objectid == INODE_PKEY(privroot->d_inode)->k_objectid);
+}
+
+int reiserfs_readdir_dentry(struct dentry *dentry, void *dirent,
+			   filldir_t filldir, loff_t *pos)
+{
+	struct inode *inode = dentry->d_inode;
+	struct cpu_key pos_key;	/* key of current position in the directory (key of directory entry) */
+	INITIALIZE_PATH(path_to_entry);
+	struct buffer_head *bh;
+	int item_num, entry_num;
+	const struct reiserfs_key *rkey;
+	struct item_head *ih, tmp_ih;
+	int search_res;
+	char *local_buf;
+	loff_t next_pos;
+	char small_buf[32];	/* avoid kmalloc if we can */
+	struct reiserfs_dir_entry de;
+	int ret = 0;
+
+	reiserfs_write_lock(inode->i_sb);
+
+	reiserfs_check_lock_depth(inode->i_sb, "readdir");
+
+	/* form key for search the next directory entry using f_pos field of
+	   file structure */
+	make_cpu_key(&pos_key, inode, *pos ?: DOT_OFFSET, TYPE_DIRENTRY, 3);
+	next_pos = cpu_key_k_offset(&pos_key);
+
+	path_to_entry.reada = PATH_READA;
+	while (1) {
+	      research:
+		/* search the directory item, containing entry with specified key */
+		search_res =
+		    search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry,
+					&de);
+		if (search_res == IO_ERROR) {
+			// FIXME: we could just skip part of directory which could
+			// not be read
+			ret = -EIO;
+			goto out;
+		}
+		entry_num = de.de_entry_num;
+		bh = de.de_bh;
+		item_num = de.de_item_num;
+		ih = de.de_ih;
+		store_ih(&tmp_ih, ih);
+
+		/* we must have found item, that is item of this directory, */
+		RFALSE(COMP_SHORT_KEYS(&(ih->ih_key), &pos_key),
+		       "vs-9000: found item %h does not match to dir we readdir %K",
+		       ih, &pos_key);
+		RFALSE(item_num > B_NR_ITEMS(bh) - 1,
+		       "vs-9005 item_num == %d, item amount == %d",
+		       item_num, B_NR_ITEMS(bh));
+
+		/* and entry must be not more than number of entries in the item */
+		RFALSE(I_ENTRY_COUNT(ih) < entry_num,
+		       "vs-9010: entry number is too big %d (%d)",
+		       entry_num, I_ENTRY_COUNT(ih));
+
+		if (search_res == POSITION_FOUND
+		    || entry_num < I_ENTRY_COUNT(ih)) {
+			/* go through all entries in the directory item beginning from the entry, that has been found */
+			struct reiserfs_de_head *deh =
+			    B_I_DEH(bh, ih) + entry_num;
+
+			for (; entry_num < I_ENTRY_COUNT(ih);
+			     entry_num++, deh++) {
+				int d_reclen;
+				char *d_name;
+				off_t d_off;
+				ino_t d_ino;
+
+				if (!de_visible(deh))
+					/* it is hidden entry */
+					continue;
+				d_reclen = entry_length(bh, ih, entry_num);
+				d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh);
+
+				if (d_reclen <= 0 ||
+				    d_name + d_reclen > bh->b_data + bh->b_size) {
+					/* There is corrupted data in entry,
+					 * We'd better stop here */
+					pathrelse(&path_to_entry);
+					ret = -EIO;
+					goto out;
+				}
+
+				if (!d_name[d_reclen - 1])
+					d_reclen = strlen(d_name);
+
+				if (d_reclen >
+				    REISERFS_MAX_NAME(inode->i_sb->
+						      s_blocksize)) {
+					/* too big to send back to VFS */
+					continue;
+				}
+
+				/* Ignore the .reiserfs_priv entry */
+				if (is_privroot_deh(dentry, deh))
+					continue;
+
+				d_off = deh_offset(deh);
+				*pos = d_off;
+				d_ino = deh_objectid(deh);
+				if (d_reclen <= 32) {
+					local_buf = small_buf;
+				} else {
+					local_buf = kmalloc(d_reclen,
+							    GFP_NOFS);
+					if (!local_buf) {
+						pathrelse(&path_to_entry);
+						ret = -ENOMEM;
+						goto out;
+					}
+					if (item_moved(&tmp_ih, &path_to_entry)) {
+						kfree(local_buf);
+						goto research;
+					}
+				}
+				// Note, that we copy name to user space via temporary
+				// buffer (local_buf) because filldir will block if
+				// user space buffer is swapped out. At that time
+				// entry can move to somewhere else
+				memcpy(local_buf, d_name, d_reclen);
+
+				/*
+				 * Since filldir might sleep, we can release
+				 * the write lock here for other waiters
+				 */
+				reiserfs_write_unlock(inode->i_sb);
+				if (filldir
+				    (dirent, local_buf, d_reclen, d_off, d_ino,
+				     DT_UNKNOWN) < 0) {
+					reiserfs_write_lock(inode->i_sb);
+					if (local_buf != small_buf) {
+						kfree(local_buf);
+					}
+					goto end;
+				}
+				reiserfs_write_lock(inode->i_sb);
+				if (local_buf != small_buf) {
+					kfree(local_buf);
+				}
+				// next entry should be looked for with such offset
+				next_pos = deh_offset(deh) + 1;
+
+				if (item_moved(&tmp_ih, &path_to_entry)) {
+					goto research;
+				}
+			}	/* for */
+		}
+
+		if (item_num != B_NR_ITEMS(bh) - 1)
+			// end of directory has been reached
+			goto end;
+
+		/* item we went through is last item of node. Using right
+		   delimiting key check is it directory end */
+		rkey = get_rkey(&path_to_entry, inode->i_sb);
+		if (!comp_le_keys(rkey, &MIN_KEY)) {
+			/* set pos_key to key, that is the smallest and greater
+			   that key of the last entry in the item */
+			set_cpu_key_k_offset(&pos_key, next_pos);
+			continue;
+		}
+
+		if (COMP_SHORT_KEYS(rkey, &pos_key)) {
+			// end of directory has been reached
+			goto end;
+		}
+
+		/* directory continues in the right neighboring block */
+		set_cpu_key_k_offset(&pos_key,
+				     le_key_k_offset(KEY_FORMAT_3_5, rkey));
+
+	}			/* while */
+
+end:
+	*pos = next_pos;
+	pathrelse(&path_to_entry);
+	reiserfs_check_path(&path_to_entry);
+out:
+	reiserfs_write_unlock(inode->i_sb);
+	return ret;
+}
+
+static int reiserfs_readdir(struct file *file, void *dirent, filldir_t filldir)
+{
+	struct dentry *dentry = file->f_path.dentry;
+	return reiserfs_readdir_dentry(dentry, dirent, filldir, &file->f_pos);
+}
+
+/* compose directory item containing "." and ".." entries (entries are
+   not aligned to 4 byte boundary) */
+/* the last four params are LE */
+void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid,
+			    __le32 par_dirid, __le32 par_objid)
+{
+	struct reiserfs_de_head *deh;
+
+	memset(body, 0, EMPTY_DIR_SIZE_V1);
+	deh = (struct reiserfs_de_head *)body;
+
+	/* direntry header of "." */
+	put_deh_offset(&(deh[0]), DOT_OFFSET);
+	/* these two are from make_le_item_head, and are are LE */
+	deh[0].deh_dir_id = dirid;
+	deh[0].deh_objectid = objid;
+	deh[0].deh_state = 0;	/* Endian safe if 0 */
+	put_deh_location(&(deh[0]), EMPTY_DIR_SIZE_V1 - strlen("."));
+	mark_de_visible(&(deh[0]));
+
+	/* direntry header of ".." */
+	put_deh_offset(&(deh[1]), DOT_DOT_OFFSET);
+	/* key of ".." for the root directory */
+	/* these two are from the inode, and are are LE */
+	deh[1].deh_dir_id = par_dirid;
+	deh[1].deh_objectid = par_objid;
+	deh[1].deh_state = 0;	/* Endian safe if 0 */
+	put_deh_location(&(deh[1]), deh_location(&(deh[0])) - strlen(".."));
+	mark_de_visible(&(deh[1]));
+
+	/* copy ".." and "." */
+	memcpy(body + deh_location(&(deh[0])), ".", 1);
+	memcpy(body + deh_location(&(deh[1])), "..", 2);
+}
+
+/* compose directory item containing "." and ".." entries */
+void make_empty_dir_item(char *body, __le32 dirid, __le32 objid,
+			 __le32 par_dirid, __le32 par_objid)
+{
+	struct reiserfs_de_head *deh;
+
+	memset(body, 0, EMPTY_DIR_SIZE);
+	deh = (struct reiserfs_de_head *)body;
+
+	/* direntry header of "." */
+	put_deh_offset(&(deh[0]), DOT_OFFSET);
+	/* these two are from make_le_item_head, and are are LE */
+	deh[0].deh_dir_id = dirid;
+	deh[0].deh_objectid = objid;
+	deh[0].deh_state = 0;	/* Endian safe if 0 */
+	put_deh_location(&(deh[0]), EMPTY_DIR_SIZE - ROUND_UP(strlen(".")));
+	mark_de_visible(&(deh[0]));
+
+	/* direntry header of ".." */
+	put_deh_offset(&(deh[1]), DOT_DOT_OFFSET);
+	/* key of ".." for the root directory */
+	/* these two are from the inode, and are are LE */
+	deh[1].deh_dir_id = par_dirid;
+	deh[1].deh_objectid = par_objid;
+	deh[1].deh_state = 0;	/* Endian safe if 0 */
+	put_deh_location(&(deh[1]),
+			 deh_location(&(deh[0])) - ROUND_UP(strlen("..")));
+	mark_de_visible(&(deh[1]));
+
+	/* copy ".." and "." */
+	memcpy(body + deh_location(&(deh[0])), ".", 1);
+	memcpy(body + deh_location(&(deh[1])), "..", 2);
+}