From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- fs/reiserfs/dir.c | 346 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 346 insertions(+) create mode 100644 fs/reiserfs/dir.c (limited to 'fs/reiserfs/dir.c') diff --git a/fs/reiserfs/dir.c b/fs/reiserfs/dir.c new file mode 100644 index 0000000000..79ee2b4366 --- /dev/null +++ b/fs/reiserfs/dir.c @@ -0,0 +1,346 @@ +/* + * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README + */ + +#include +#include +#include +#include "reiserfs.h" +#include +#include +#include +#include + +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_shared = 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 = file_write_and_wait_range(filp, start, end); + if (err) + return err; + + inode_lock(inode); + reiserfs_write_lock(inode->i_sb); + err = reiserfs_commit_for_inode(inode); + reiserfs_write_unlock(inode->i_sb); + inode_unlock(inode); + 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 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 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 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 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); +} -- cgit v1.2.3