Initial import

1 files changed, 346 insertions, 0 deletions

diff --git a/fs/reiserfs/dir.c b/fs/reiserfs/dir.c
new file mode 100644
index 000000000..4a024e2ce
--- /dev/null
+++ b/fs/reiserfs/dir.c
@@ -0,0 +1,346 @@
+/*
+ * 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 <linux/uaccess.h>
+
+extern const struct reiserfs_key MIN_KEY;
+
+static int reiserfs_readdir(struct file *, struct dir_context *);
+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,
+	.iterate = 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 inode *dir, struct reiserfs_de_head *deh)
+{
+	struct dentry *privroot = REISERFS_SB(dir->i_sb)->priv_root;
+	return (d_really_is_positive(privroot) &&
+	        deh->deh_objectid == INODE_PKEY(d_inode(privroot))->k_objectid);
+}
+
+int reiserfs_readdir_inode(struct inode *inode, struct dir_context *ctx)
+{
+
+	/* key of current position in the directory (key of directory entry) */
+	struct cpu_key pos_key;
+
+	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;
+	int depth;
+
+	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, ctx->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(ih_entry_count(ih) < entry_num,
+		       "vs-9010: entry number is too big %d (%d)",
+		       entry_num, ih_entry_count(ih));
+
+		/*
+		 * go through all entries in the directory item beginning
+		 * from the entry, that has been found
+		 */
+		if (search_res == POSITION_FOUND
+		    || entry_num < ih_entry_count(ih)) {
+			struct reiserfs_de_head *deh =
+			    B_I_DEH(bh, ih) + entry_num;
+
+			for (; entry_num < ih_entry_count(ih);
+			     entry_num++, deh++) {
+				int d_reclen;
+				char *d_name;
+				ino_t d_ino;
+				loff_t cur_pos = deh_offset(deh);
+
+				/* it is hidden entry */
+				if (!de_visible(deh))
+					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);
+
+				/* too big to send back to VFS */
+				if (d_reclen >
+				    REISERFS_MAX_NAME(inode->i_sb->
+						      s_blocksize)) {
+					continue;
+				}
+
+				/* Ignore the .reiserfs_priv entry */
+				if (is_privroot_deh(inode, deh))
+					continue;
+
+				ctx->pos = deh_offset(deh);
+				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
+				 */
+				depth = reiserfs_write_unlock_nested(inode->i_sb);
+				if (!dir_emit
+				    (ctx, local_buf, d_reclen, d_ino,
+				     DT_UNKNOWN)) {
+					reiserfs_write_lock_nested(inode->i_sb, depth);
+					if (local_buf != small_buf) {
+						kfree(local_buf);
+					}
+					goto end;
+				}
+				reiserfs_write_lock_nested(inode->i_sb, depth);
+				if (local_buf != small_buf) {
+					kfree(local_buf);
+				}
+
+				/* deh_offset(deh) may be invalid now. */
+				next_pos = cur_pos + 1;
+
+				if (item_moved(&tmp_ih, &path_to_entry)) {
+					set_cpu_key_k_offset(&pos_key,
+							     next_pos);
+					goto research;
+				}
+			}	/* for */
+		}
+
+		/* end of directory has been reached */
+		if (item_num != B_NR_ITEMS(bh) - 1)
+			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;
+		}
+
+		/* end of directory has been reached */
+		if (COMP_SHORT_KEYS(rkey, &pos_key)) {
+			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:
+	ctx->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, struct dir_context *ctx)
+{
+	return reiserfs_readdir_inode(file_inode(file), ctx);
+}
+
+/*
+ * compose directory item containing "." and ".." entries (entries are
+ * not aligned to 4 byte boundary)
+ */
+void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid,
+			    __le32 par_dirid, __le32 par_objid)
+{
+	struct reiserfs_de_head *dot, *dotdot;
+
+	memset(body, 0, EMPTY_DIR_SIZE_V1);
+	dot = (struct reiserfs_de_head *)body;
+	dotdot = dot + 1;
+
+	/* direntry header of "." */
+	put_deh_offset(dot, DOT_OFFSET);
+	/* these two are from make_le_item_head, and are are LE */
+	dot->deh_dir_id = dirid;
+	dot->deh_objectid = objid;
+	dot->deh_state = 0;	/* Endian safe if 0 */
+	put_deh_location(dot, EMPTY_DIR_SIZE_V1 - strlen("."));
+	mark_de_visible(dot);
+
+	/* direntry header of ".." */
+	put_deh_offset(dotdot, DOT_DOT_OFFSET);
+	/* key of ".." for the root directory */
+	/* these two are from the inode, and are are LE */
+	dotdot->deh_dir_id = par_dirid;
+	dotdot->deh_objectid = par_objid;
+	dotdot->deh_state = 0;	/* Endian safe if 0 */
+	put_deh_location(dotdot, deh_location(dot) - strlen(".."));
+	mark_de_visible(dotdot);
+
+	/* copy ".." and "." */
+	memcpy(body + deh_location(dot), ".", 1);
+	memcpy(body + deh_location(dotdot), "..", 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 *dot, *dotdot;
+
+	memset(body, 0, EMPTY_DIR_SIZE);
+	dot = (struct reiserfs_de_head *)body;
+	dotdot = dot + 1;
+
+	/* direntry header of "." */
+	put_deh_offset(dot, DOT_OFFSET);
+	/* these two are from make_le_item_head, and are are LE */
+	dot->deh_dir_id = dirid;
+	dot->deh_objectid = objid;
+	dot->deh_state = 0;	/* Endian safe if 0 */
+	put_deh_location(dot, EMPTY_DIR_SIZE - ROUND_UP(strlen(".")));
+	mark_de_visible(dot);
+
+	/* direntry header of ".." */
+	put_deh_offset(dotdot, DOT_DOT_OFFSET);
+	/* key of ".." for the root directory */
+	/* these two are from the inode, and are are LE */
+	dotdot->deh_dir_id = par_dirid;
+	dotdot->deh_objectid = par_objid;
+	dotdot->deh_state = 0;	/* Endian safe if 0 */
+	put_deh_location(dotdot, deh_location(dot) - ROUND_UP(strlen("..")));
+	mark_de_visible(dotdot);
+
+	/* copy ".." and "." */
+	memcpy(body + deh_location(dot), ".", 1);
+	memcpy(body + deh_location(dotdot), "..", 2);
+}