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-rw-r--r--fs/reiserfs/dir.c275
1 files changed, 275 insertions, 0 deletions
diff --git a/fs/reiserfs/dir.c b/fs/reiserfs/dir.c
new file mode 100644
index 000000000000..d1514a9b0514
--- /dev/null
+++ b/fs/reiserfs/dir.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
+ */
+
+#include <linux/config.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/reiserfs_fs.h>
+#include <linux/stat.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+#include <asm/uaccess.h>
+
+extern struct reiserfs_key MIN_KEY;
+
+static int reiserfs_readdir (struct file *, void *, filldir_t);
+static int reiserfs_dir_fsync(struct file *filp, struct dentry *dentry, int datasync) ;
+
+struct file_operations reiserfs_dir_operations = {
+ .read = generic_read_dir,
+ .readdir = reiserfs_readdir,
+ .fsync = reiserfs_dir_fsync,
+ .ioctl = reiserfs_ioctl,
+};
+
+static int reiserfs_dir_fsync(struct file *filp, struct dentry *dentry, int datasync) {
+ struct inode *inode = dentry->d_inode;
+ int err;
+ reiserfs_write_lock(inode->i_sb);
+ err = reiserfs_commit_for_inode(inode) ;
+ reiserfs_write_unlock(inode->i_sb) ;
+ if (err < 0)
+ return err;
+ return 0;
+}
+
+
+#define store_ih(where,what) copy_item_head (where, what)
+
+//
+static int reiserfs_readdir (struct file * filp, void * dirent, filldir_t filldir)
+{
+ struct inode *inode = filp->f_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, (filp->f_pos) ? (filp->f_pos) : DOT_OFFSET,
+ TYPE_DIRENTRY, 3);
+ next_pos = cpu_key_k_offset (&pos_key);
+
+ /* reiserfs_warning (inode->i_sb, "reiserfs_readdir 1: f_pos = %Ld", filp->f_pos);*/
+
+ 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_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 (reiserfs_xattrs (inode->i_sb) &&
+ !old_format_only(inode->i_sb) &&
+ filp->f_dentry == inode->i_sb->s_root &&
+ REISERFS_SB(inode->i_sb)->priv_root &&
+ REISERFS_SB(inode->i_sb)->priv_root->d_inode &&
+ deh_objectid(deh) == le32_to_cpu (INODE_PKEY(REISERFS_SB(inode->i_sb)->priv_root->d_inode)->k_objectid)) {
+ continue;
+ }
+
+ d_off = deh_offset (deh);
+ filp->f_pos = d_off ;
+ d_ino = deh_objectid (deh);
+ if (d_reclen <= 32) {
+ local_buf = small_buf ;
+ } else {
+ local_buf = reiserfs_kmalloc(d_reclen, GFP_NOFS, inode->i_sb) ;
+ if (!local_buf) {
+ pathrelse (&path_to_entry);
+ ret = -ENOMEM ;
+ goto out;
+ }
+ if (item_moved (&tmp_ih, &path_to_entry)) {
+ reiserfs_kfree(local_buf, d_reclen, inode->i_sb) ;
+ 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);
+ if (filldir (dirent, local_buf, d_reclen, d_off, d_ino,
+ DT_UNKNOWN) < 0) {
+ if (local_buf != small_buf) {
+ reiserfs_kfree(local_buf, d_reclen, inode->i_sb) ;
+ }
+ goto end;
+ }
+ if (local_buf != small_buf) {
+ reiserfs_kfree(local_buf, d_reclen, inode->i_sb) ;
+ }
+
+ // 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:
+ filp->f_pos = next_pos;
+ pathrelse (&path_to_entry);
+ reiserfs_check_path(&path_to_entry) ;
+ out:
+ reiserfs_write_unlock(inode->i_sb);
+ return ret;
+}
+
+/* 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, __u32 dirid, __u32 objid,
+ __u32 par_dirid, __u32 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, __u32 dirid, __u32 objid,
+ __u32 par_dirid, __u32 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);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-16 02:23:18 +0000