/* -*- mode: c; c-basic-offset: 8; -*- * vim: noexpandtab sw=8 ts=8 sts=0: * * dir.c * * Creates, reads, walks and deletes directory-nodes * * Copyright (C) 2002, 2004 Oracle. All rights reserved. * * Portions of this code from linux/fs/ext3/dir.c * * Copyright (C) 1992, 1993, 1994, 1995 * Remy Card (card@masi.ibp.fr) * Laboratoire MASI - Institut Blaise pascal * Universite Pierre et Marie Curie (Paris VI) * * from * * linux/fs/minix/dir.c * * Copyright (C) 1991, 1992 Linux Torvalds * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. */ #include #include #include #include #define MLOG_MASK_PREFIX ML_NAMEI #include #include "ocfs2.h" #include "alloc.h" #include "dir.h" #include "dlmglue.h" #include "extent_map.h" #include "file.h" #include "inode.h" #include "journal.h" #include "namei.h" #include "suballoc.h" #include "super.h" #include "uptodate.h" #include "buffer_head_io.h" #define NAMEI_RA_CHUNKS 2 #define NAMEI_RA_BLOCKS 4 #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) #define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b)) static unsigned char ocfs2_filetype_table[] = { DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK }; static int ocfs2_extend_dir(struct ocfs2_super *osb, struct inode *dir, struct buffer_head *parent_fe_bh, unsigned int blocks_wanted, struct buffer_head **new_de_bh); static int ocfs2_do_extend_dir(struct super_block *sb, handle_t *handle, struct inode *dir, struct buffer_head *parent_fe_bh, struct ocfs2_alloc_context *data_ac, struct ocfs2_alloc_context *meta_ac, struct buffer_head **new_bh); static struct buffer_head *ocfs2_bread(struct inode *inode, int block, int *err, int reada) { struct buffer_head *bh = NULL; int tmperr; u64 p_blkno; int readflags = 0; if (reada) readflags |= OCFS2_BH_READAHEAD; if (((u64)block << inode->i_sb->s_blocksize_bits) >= i_size_read(inode)) { BUG_ON(!reada); return NULL; } down_read(&OCFS2_I(inode)->ip_alloc_sem); tmperr = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, NULL); up_read(&OCFS2_I(inode)->ip_alloc_sem); if (tmperr < 0) { mlog_errno(tmperr); goto fail; } tmperr = ocfs2_read_blocks(inode, p_blkno, 1, &bh, readflags); if (tmperr < 0) goto fail; tmperr = 0; *err = 0; return bh; fail: brelse(bh); bh = NULL; *err = -EIO; return NULL; } /* * bh passed here can be an inode block or a dir data block, depending * on the inode inline data flag. */ static int ocfs2_check_dir_entry(struct inode * dir, struct ocfs2_dir_entry * de, struct buffer_head * bh, unsigned long offset) { const char *error_msg = NULL; const int rlen = le16_to_cpu(de->rec_len); if (rlen < OCFS2_DIR_REC_LEN(1)) error_msg = "rec_len is smaller than minimal"; else if (rlen % 4 != 0) error_msg = "rec_len % 4 != 0"; else if (rlen < OCFS2_DIR_REC_LEN(de->name_len)) error_msg = "rec_len is too small for name_len"; else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize) error_msg = "directory entry across blocks"; if (error_msg != NULL) mlog(ML_ERROR, "bad entry in directory #%llu: %s - " "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n", (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg, offset, (unsigned long long)le64_to_cpu(de->inode), rlen, de->name_len); return error_msg == NULL ? 1 : 0; } static inline int ocfs2_match(int len, const char * const name, struct ocfs2_dir_entry *de) { if (len != de->name_len) return 0; if (!de->inode) return 0; return !memcmp(name, de->name, len); } /* * Returns 0 if not found, -1 on failure, and 1 on success */ static int inline ocfs2_search_dirblock(struct buffer_head *bh, struct inode *dir, const char *name, int namelen, unsigned long offset, char *first_de, unsigned int bytes, struct ocfs2_dir_entry **res_dir) { struct ocfs2_dir_entry *de; char *dlimit, *de_buf; int de_len; int ret = 0; mlog_entry_void(); de_buf = first_de; dlimit = de_buf + bytes; while (de_buf < dlimit) { /* this code is executed quadratically often */ /* do minimal checking `by hand' */ de = (struct ocfs2_dir_entry *) de_buf; if (de_buf + namelen <= dlimit && ocfs2_match(namelen, name, de)) { /* found a match - just to be sure, do a full check */ if (!ocfs2_check_dir_entry(dir, de, bh, offset)) { ret = -1; goto bail; } *res_dir = de; ret = 1; goto bail; } /* prevent looping on a bad block */ de_len = le16_to_cpu(de->rec_len); if (de_len <= 0) { ret = -1; goto bail; } de_buf += de_len; offset += de_len; } bail: mlog_exit(ret); return ret; } static struct buffer_head *ocfs2_find_entry_id(const char *name, int namelen, struct inode *dir, struct ocfs2_dir_entry **res_dir) { int ret, found; struct buffer_head *di_bh = NULL; struct ocfs2_dinode *di; struct ocfs2_inline_data *data; ret = ocfs2_read_block(dir, OCFS2_I(dir)->ip_blkno, &di_bh); if (ret) { mlog_errno(ret); goto out; } di = (struct ocfs2_dinode *)di_bh->b_data; data = &di->id2.i_data; found = ocfs2_search_dirblock(di_bh, dir, name, namelen, 0, data->id_data, i_size_read(dir), res_dir); if (found == 1) return di_bh; brelse(di_bh); out: return NULL; } static struct buffer_head *ocfs2_find_entry_el(const char *name, int namelen, struct inode *dir, struct ocfs2_dir_entry **res_dir) { struct super_block *sb; struct buffer_head *bh_use[NAMEI_RA_SIZE]; struct buffer_head *bh, *ret = NULL; unsigned long start, block, b; int ra_max = 0; /* Number of bh's in the readahead buffer, bh_use[] */ int ra_ptr = 0; /* Current index into readahead buffer */ int num = 0; int nblocks, i, err; mlog_entry_void(); sb = dir->i_sb; nblocks = i_size_read(dir) >> sb->s_blocksize_bits; start = OCFS2_I(dir)->ip_dir_start_lookup; if (start >= nblocks) start = 0; block = start; restart: do { /* * We deal with the read-ahead logic here. */ if (ra_ptr >= ra_max) { /* Refill the readahead buffer */ ra_ptr = 0; b = block; for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) { /* * Terminate if we reach the end of the * directory and must wrap, or if our * search has finished at this block. */ if (b >= nblocks || (num && block == start)) { bh_use[ra_max] = NULL; break; } num++; bh = ocfs2_bread(dir, b++, &err, 1); bh_use[ra_max] = bh; } } if ((bh = bh_use[ra_ptr++]) == NULL) goto next; if (ocfs2_read_block(dir, block, &bh)) { /* read error, skip block & hope for the best. * ocfs2_read_block() has released the bh. */ ocfs2_error(dir->i_sb, "reading directory %llu, " "offset %lu\n", (unsigned long long)OCFS2_I(dir)->ip_blkno, block); goto next; } i = ocfs2_search_dirblock(bh, dir, name, namelen, block << sb->s_blocksize_bits, bh->b_data, sb->s_blocksize, res_dir); if (i == 1) { OCFS2_I(dir)->ip_dir_start_lookup = block; ret = bh; goto cleanup_and_exit; } else { brelse(bh); if (i < 0) goto cleanup_and_exit; } next: if (++block >= nblocks) block = 0; } while (block != start); /* * If the directory has grown while we were searching, then * search the last part of the directory before giving up. */ block = nblocks; nblocks = i_size_read(dir) >> sb->s_blocksize_bits; if (block < nblocks) { start = 0; goto restart; } cleanup_and_exit: /* Clean up the read-ahead blocks */ for (; ra_ptr < ra_max; ra_ptr++) brelse(bh_use[ra_ptr]); mlog_exit_ptr(ret); return ret; } /* * Try to find an entry of the provided name within 'dir'. * * If nothing was found, NULL is returned. Otherwise, a buffer_head * and pointer to the dir entry are passed back. * * Caller can NOT assume anything about the contents of the * buffer_head - it is passed back only so that it can be passed into * any one of the manipulation functions (add entry, delete entry, * etc). As an example, bh in the extent directory case is a data * block, in the inline-data case it actually points to an inode. */ struct buffer_head *ocfs2_find_entry(const char *name, int namelen, struct inode *dir, struct ocfs2_dir_entry **res_dir) { *res_dir = NULL; if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) return ocfs2_find_entry_id(name, namelen, dir, res_dir); return ocfs2_find_entry_el(name, namelen, dir, res_dir); } /* * Update inode number and type of a previously found directory entry. */ int ocfs2_update_entry(struct inode *dir, handle_t *handle, struct buffer_head *de_bh, struct ocfs2_dir_entry *de, struct inode *new_entry_inode) { int ret; /* * The same code works fine for both inline-data and extent * based directories, so no need to split this up. */ ret = ocfs2_journal_access(handle, dir, de_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out; } de->inode = cpu_to_le64(OCFS2_I(new_entry_inode)->ip_blkno); ocfs2_set_de_type(de, new_entry_inode->i_mode); ocfs2_journal_dirty(handle, de_bh); out: return ret; } static int __ocfs2_delete_entry(handle_t *handle, struct inode *dir, struct ocfs2_dir_entry *de_del, struct buffer_head *bh, char *first_de, unsigned int bytes) { struct ocfs2_dir_entry *de, *pde; int i, status = -ENOENT; mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh); i = 0; pde = NULL; de = (struct ocfs2_dir_entry *) first_de; while (i < bytes) { if (!ocfs2_check_dir_entry(dir, de, bh, i)) { status = -EIO; mlog_errno(status); goto bail; } if (de == de_del) { status = ocfs2_journal_access(handle, dir, bh, OCFS2_JOURNAL_ACCESS_WRITE); if (status < 0) { status = -EIO; mlog_errno(status); goto bail; } if (pde) le16_add_cpu(&pde->rec_len, le16_to_cpu(de->rec_len)); else de->inode = 0; dir->i_version++; status = ocfs2_journal_dirty(handle, bh); goto bail; } i += le16_to_cpu(de->rec_len); pde = de; de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len)); } bail: mlog_exit(status); return status; } static inline int ocfs2_delete_entry_id(handle_t *handle, struct inode *dir, struct ocfs2_dir_entry *de_del, struct buffer_head *bh) { int ret; struct buffer_head *di_bh = NULL; struct ocfs2_dinode *di; struct ocfs2_inline_data *data; ret = ocfs2_read_block(dir, OCFS2_I(dir)->ip_blkno, &di_bh); if (ret) { mlog_errno(ret); goto out; } di = (struct ocfs2_dinode *)di_bh->b_data; data = &di->id2.i_data; ret = __ocfs2_delete_entry(handle, dir, de_del, bh, data->id_data, i_size_read(dir)); brelse(di_bh); out: return ret; } static inline int ocfs2_delete_entry_el(handle_t *handle, struct inode *dir, struct ocfs2_dir_entry *de_del, struct buffer_head *bh) { return __ocfs2_delete_entry(handle, dir, de_del, bh, bh->b_data, bh->b_size); } /* * ocfs2_delete_entry deletes a directory entry by merging it with the * previous entry */ int ocfs2_delete_entry(handle_t *handle, struct inode *dir, struct ocfs2_dir_entry *de_del, struct buffer_head *bh) { if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) return ocfs2_delete_entry_id(handle, dir, de_del, bh); return ocfs2_delete_entry_el(handle, dir, de_del, bh); } /* * Check whether 'de' has enough room to hold an entry of * 'new_rec_len' bytes. */ static inline int ocfs2_dirent_would_fit(struct ocfs2_dir_entry *de, unsigned int new_rec_len) { unsigned int de_really_used; /* Check whether this is an empty record with enough space */ if (le64_to_cpu(de->inode) == 0 && le16_to_cpu(de->rec_len) >= new_rec_len) return 1; /* * Record might have free space at the end which we can * use. */ de_really_used = OCFS2_DIR_REC_LEN(de->name_len); if (le16_to_cpu(de->rec_len) >= (de_really_used + new_rec_len)) return 1; return 0; } /* we don't always have a dentry for what we want to add, so people * like orphan dir can call this instead. * * If you pass me insert_bh, I'll skip the search of the other dir * blocks and put the record in there. */ int __ocfs2_add_entry(handle_t *handle, struct inode *dir, const char *name, int namelen, struct inode *inode, u64 blkno, struct buffer_head *parent_fe_bh, struct buffer_head *insert_bh) { unsigned long offset; unsigned short rec_len; struct ocfs2_dir_entry *de, *de1; struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_fe_bh->b_data; struct super_block *sb = dir->i_sb; int retval, status; unsigned int size = sb->s_blocksize; char *data_start = insert_bh->b_data; mlog_entry_void(); if (!namelen) return -EINVAL; if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { data_start = di->id2.i_data.id_data; size = i_size_read(dir); BUG_ON(insert_bh != parent_fe_bh); } rec_len = OCFS2_DIR_REC_LEN(namelen); offset = 0; de = (struct ocfs2_dir_entry *) data_start; while (1) { BUG_ON((char *)de >= (size + data_start)); /* These checks should've already been passed by the * prepare function, but I guess we can leave them * here anyway. */ if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) { retval = -ENOENT; goto bail; } if (ocfs2_match(namelen, name, de)) { retval = -EEXIST; goto bail; } if (ocfs2_dirent_would_fit(de, rec_len)) { dir->i_mtime = dir->i_ctime = CURRENT_TIME; retval = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh); if (retval < 0) { mlog_errno(retval); goto bail; } status = ocfs2_journal_access(handle, dir, insert_bh, OCFS2_JOURNAL_ACCESS_WRITE); /* By now the buffer is marked for journaling */ offset += le16_to_cpu(de->rec_len); if (le64_to_cpu(de->inode)) { de1 = (struct ocfs2_dir_entry *)((char *) de + OCFS2_DIR_REC_LEN(de->name_len)); de1->rec_len = cpu_to_le16(le16_to_cpu(de->rec_len) - OCFS2_DIR_REC_LEN(de->name_len)); de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len)); de = de1; } de->file_type = OCFS2_FT_UNKNOWN; if (blkno) { de->inode = cpu_to_le64(blkno); ocfs2_set_de_type(de, inode->i_mode); } else de->inode = 0; de->name_len = namelen; memcpy(de->name, name, namelen); dir->i_version++; status = ocfs2_journal_dirty(handle, insert_bh); retval = 0; goto bail; } offset += le16_to_cpu(de->rec_len); de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len)); } /* when you think about it, the assert above should prevent us * from ever getting here. */ retval = -ENOSPC; bail: mlog_exit(retval); return retval; } static int ocfs2_dir_foreach_blk_id(struct inode *inode, u64 *f_version, loff_t *f_pos, void *priv, filldir_t filldir, int *filldir_err) { int ret, i, filldir_ret; unsigned long offset = *f_pos; struct buffer_head *di_bh = NULL; struct ocfs2_dinode *di; struct ocfs2_inline_data *data; struct ocfs2_dir_entry *de; ret = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, &di_bh); if (ret) { mlog(ML_ERROR, "Unable to read inode block for dir %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); goto out; } di = (struct ocfs2_dinode *)di_bh->b_data; data = &di->id2.i_data; while (*f_pos < i_size_read(inode)) { revalidate: /* If the dir block has changed since the last call to * readdir(2), then we might be pointing to an invalid * dirent right now. Scan from the start of the block * to make sure. */ if (*f_version != inode->i_version) { for (i = 0; i < i_size_read(inode) && i < offset; ) { de = (struct ocfs2_dir_entry *) (data->id_data + i); /* It's too expensive to do a full * dirent test each time round this * loop, but we do have to test at * least that it is non-zero. A * failure will be detected in the * dirent test below. */ if (le16_to_cpu(de->rec_len) < OCFS2_DIR_REC_LEN(1)) break; i += le16_to_cpu(de->rec_len); } *f_pos = offset = i; *f_version = inode->i_version; } de = (struct ocfs2_dir_entry *) (data->id_data + *f_pos); if (!ocfs2_check_dir_entry(inode, de, di_bh, *f_pos)) { /* On error, skip the f_pos to the end. */ *f_pos = i_size_read(inode); goto out; } offset += le16_to_cpu(de->rec_len); if (le64_to_cpu(de->inode)) { /* We might block in the next section * if the data destination is * currently swapped out. So, use a * version stamp to detect whether or * not the directory has been modified * during the copy operation. */ u64 version = *f_version; unsigned char d_type = DT_UNKNOWN; if (de->file_type < OCFS2_FT_MAX) d_type = ocfs2_filetype_table[de->file_type]; filldir_ret = filldir(priv, de->name, de->name_len, *f_pos, le64_to_cpu(de->inode), d_type); if (filldir_ret) { if (filldir_err) *filldir_err = filldir_ret; break; } if (version != *f_version) goto revalidate; } *f_pos += le16_to_cpu(de->rec_len); } out: brelse(di_bh); return 0; } static int ocfs2_dir_foreach_blk_el(struct inode *inode, u64 *f_version, loff_t *f_pos, void *priv, filldir_t filldir, int *filldir_err) { int error = 0; unsigned long offset, blk, last_ra_blk = 0; int i, stored; struct buffer_head * bh, * tmp; struct ocfs2_dir_entry * de; int err; struct super_block * sb = inode->i_sb; unsigned int ra_sectors = 16; stored = 0; bh = NULL; offset = (*f_pos) & (sb->s_blocksize - 1); while (!error && !stored && *f_pos < i_size_read(inode)) { blk = (*f_pos) >> sb->s_blocksize_bits; bh = ocfs2_bread(inode, blk, &err, 0); if (!bh) { mlog(ML_ERROR, "directory #%llu contains a hole at offset %lld\n", (unsigned long long)OCFS2_I(inode)->ip_blkno, *f_pos); *f_pos += sb->s_blocksize - offset; continue; } /* The idea here is to begin with 8k read-ahead and to stay * 4k ahead of our current position. * * TODO: Use the pagecache for this. We just need to * make sure it's cluster-safe... */ if (!last_ra_blk || (((last_ra_blk - blk) << 9) <= (ra_sectors / 2))) { for (i = ra_sectors >> (sb->s_blocksize_bits - 9); i > 0; i--) { tmp = ocfs2_bread(inode, ++blk, &err, 1); brelse(tmp); } last_ra_blk = blk; ra_sectors = 8; } revalidate: /* If the dir block has changed since the last call to * readdir(2), then we might be pointing to an invalid * dirent right now. Scan from the start of the block * to make sure. */ if (*f_version != inode->i_version) { for (i = 0; i < sb->s_blocksize && i < offset; ) { de = (struct ocfs2_dir_entry *) (bh->b_data + i); /* It's too expensive to do a full * dirent test each time round this * loop, but we do have to test at * least that it is non-zero. A * failure will be detected in the * dirent test below. */ if (le16_to_cpu(de->rec_len) < OCFS2_DIR_REC_LEN(1)) break; i += le16_to_cpu(de->rec_len); } offset = i; *f_pos = ((*f_pos) & ~(sb->s_blocksize - 1)) | offset; *f_version = inode->i_version; } while (!error && *f_pos < i_size_read(inode) && offset < sb->s_blocksize) { de = (struct ocfs2_dir_entry *) (bh->b_data + offset); if (!ocfs2_check_dir_entry(inode, de, bh, offset)) { /* On error, skip the f_pos to the next block. */ *f_pos = ((*f_pos) | (sb->s_blocksize - 1)) + 1; brelse(bh); goto out; } offset += le16_to_cpu(de->rec_len); if (le64_to_cpu(de->inode)) { /* We might block in the next section * if the data destination is * currently swapped out. So, use a * version stamp to detect whether or * not the directory has been modified * during the copy operation. */ unsigned long version = *f_version; unsigned char d_type = DT_UNKNOWN; if (de->file_type < OCFS2_FT_MAX) d_type = ocfs2_filetype_table[de->file_type]; error = filldir(priv, de->name, de->name_len, *f_pos, le64_to_cpu(de->inode), d_type); if (error) { if (filldir_err) *filldir_err = error; break; } if (version != *f_version) goto revalidate; stored ++; } *f_pos += le16_to_cpu(de->rec_len); } offset = 0; brelse(bh); } stored = 0; out: return stored; } static int ocfs2_dir_foreach_blk(struct inode *inode, u64 *f_version, loff_t *f_pos, void *priv, filldir_t filldir, int *filldir_err) { if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) return ocfs2_dir_foreach_blk_id(inode, f_version, f_pos, priv, filldir, filldir_err); return ocfs2_dir_foreach_blk_el(inode, f_version, f_pos, priv, filldir, filldir_err); } /* * This is intended to be called from inside other kernel functions, * so we fake some arguments. */ int ocfs2_dir_foreach(struct inode *inode, loff_t *f_pos, void *priv, filldir_t filldir) { int ret = 0, filldir_err = 0; u64 version = inode->i_version; while (*f_pos < i_size_read(inode)) { ret = ocfs2_dir_foreach_blk(inode, &version, f_pos, priv, filldir, &filldir_err); if (ret || filldir_err) break; } if (ret > 0) ret = -EIO; return 0; } /* * ocfs2_readdir() * */ int ocfs2_readdir(struct file * filp, void * dirent, filldir_t filldir) { int error = 0; struct inode *inode = filp->f_path.dentry->d_inode; int lock_level = 0; mlog_entry("dirino=%llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); error = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level); if (lock_level && error >= 0) { /* We release EX lock which used to update atime * and get PR lock again to reduce contention * on commonly accessed directories. */ ocfs2_inode_unlock(inode, 1); lock_level = 0; error = ocfs2_inode_lock(inode, NULL, 0); } if (error < 0) { if (error != -ENOENT) mlog_errno(error); /* we haven't got any yet, so propagate the error. */ goto bail_nolock; } error = ocfs2_dir_foreach_blk(inode, &filp->f_version, &filp->f_pos, dirent, filldir, NULL); ocfs2_inode_unlock(inode, lock_level); bail_nolock: mlog_exit(error); return error; } /* * NOTE: this should always be called with parent dir i_mutex taken. */ int ocfs2_find_files_on_disk(const char *name, int namelen, u64 *blkno, struct inode *inode, struct buffer_head **dirent_bh, struct ocfs2_dir_entry **dirent) { int status = -ENOENT; mlog_entry("(name=%.*s, blkno=%p, inode=%p, dirent_bh=%p, dirent=%p)\n", namelen, name, blkno, inode, dirent_bh, dirent); *dirent_bh = ocfs2_find_entry(name, namelen, inode, dirent); if (!*dirent_bh || !*dirent) { status = -ENOENT; goto leave; } *blkno = le64_to_cpu((*dirent)->inode); status = 0; leave: if (status < 0) { *dirent = NULL; brelse(*dirent_bh); *dirent_bh = NULL; } mlog_exit(status); return status; } /* * Convenience function for callers which just want the block number * mapped to a name and don't require the full dirent info, etc. */ int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name, int namelen, u64 *blkno) { int ret; struct buffer_head *bh = NULL; struct ocfs2_dir_entry *dirent = NULL; ret = ocfs2_find_files_on_disk(name, namelen, blkno, dir, &bh, &dirent); brelse(bh); return ret; } /* Check for a name within a directory. * * Return 0 if the name does not exist * Return -EEXIST if the directory contains the name * * Callers should have i_mutex + a cluster lock on dir */ int ocfs2_check_dir_for_entry(struct inode *dir, const char *name, int namelen) { int ret; struct buffer_head *dirent_bh = NULL; struct ocfs2_dir_entry *dirent = NULL; mlog_entry("dir %llu, name '%.*s'\n", (unsigned long long)OCFS2_I(dir)->ip_blkno, namelen, name); ret = -EEXIST; dirent_bh = ocfs2_find_entry(name, namelen, dir, &dirent); if (dirent_bh) goto bail; ret = 0; bail: brelse(dirent_bh); mlog_exit(ret); return ret; } struct ocfs2_empty_dir_priv { unsigned seen_dot; unsigned seen_dot_dot; unsigned seen_other; }; static int ocfs2_empty_dir_filldir(void *priv, const char *name, int name_len, loff_t pos, u64 ino, unsigned type) { struct ocfs2_empty_dir_priv *p = priv; /* * Check the positions of "." and ".." records to be sure * they're in the correct place. */ if (name_len == 1 && !strncmp(".", name, 1) && pos == 0) { p->seen_dot = 1; return 0; } if (name_len == 2 && !strncmp("..", name, 2) && pos == OCFS2_DIR_REC_LEN(1)) { p->seen_dot_dot = 1; return 0; } p->seen_other = 1; return 1; } /* * routine to check that the specified directory is empty (for rmdir) * * Returns 1 if dir is empty, zero otherwise. */ int ocfs2_empty_dir(struct inode *inode) { int ret; loff_t start = 0; struct ocfs2_empty_dir_priv priv; memset(&priv, 0, sizeof(priv)); ret = ocfs2_dir_foreach(inode, &start, &priv, ocfs2_empty_dir_filldir); if (ret) mlog_errno(ret); if (!priv.seen_dot || !priv.seen_dot_dot) { mlog(ML_ERROR, "bad directory (dir #%llu) - no `.' or `..'\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); /* * XXX: Is it really safe to allow an unlink to continue? */ return 1; } return !priv.seen_other; } static void ocfs2_fill_initial_dirents(struct inode *inode, struct inode *parent, char *start, unsigned int size) { struct ocfs2_dir_entry *de = (struct ocfs2_dir_entry *)start; de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno); de->name_len = 1; de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len)); strcpy(de->name, "."); ocfs2_set_de_type(de, S_IFDIR); de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len)); de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno); de->rec_len = cpu_to_le16(size - OCFS2_DIR_REC_LEN(1)); de->name_len = 2; strcpy(de->name, ".."); ocfs2_set_de_type(de, S_IFDIR); } /* * This works together with code in ocfs2_mknod_locked() which sets * the inline-data flag and initializes the inline-data section. */ static int ocfs2_fill_new_dir_id(struct ocfs2_super *osb, handle_t *handle, struct inode *parent, struct inode *inode, struct buffer_head *di_bh) { int ret; struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; struct ocfs2_inline_data *data = &di->id2.i_data; unsigned int size = le16_to_cpu(data->id_count); ret = ocfs2_journal_access(handle, inode, di_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out; } ocfs2_fill_initial_dirents(inode, parent, data->id_data, size); ocfs2_journal_dirty(handle, di_bh); if (ret) { mlog_errno(ret); goto out; } i_size_write(inode, size); inode->i_nlink = 2; inode->i_blocks = ocfs2_inode_sector_count(inode); ret = ocfs2_mark_inode_dirty(handle, inode, di_bh); if (ret < 0) mlog_errno(ret); out: return ret; } static int ocfs2_fill_new_dir_el(struct ocfs2_super *osb, handle_t *handle, struct inode *parent, struct inode *inode, struct buffer_head *fe_bh, struct ocfs2_alloc_context *data_ac) { int status; struct buffer_head *new_bh = NULL; mlog_entry_void(); status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh, data_ac, NULL, &new_bh); if (status < 0) { mlog_errno(status); goto bail; } ocfs2_set_new_buffer_uptodate(inode, new_bh); status = ocfs2_journal_access(handle, inode, new_bh, OCFS2_JOURNAL_ACCESS_CREATE); if (status < 0) { mlog_errno(status); goto bail; } memset(new_bh->b_data, 0, osb->sb->s_blocksize); ocfs2_fill_initial_dirents(inode, parent, new_bh->b_data, osb->sb->s_blocksize); status = ocfs2_journal_dirty(handle, new_bh); if (status < 0) { mlog_errno(status); goto bail; } i_size_write(inode, inode->i_sb->s_blocksize); inode->i_nlink = 2; inode->i_blocks = ocfs2_inode_sector_count(inode); status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); if (status < 0) { mlog_errno(status); goto bail; } status = 0; bail: brelse(new_bh); mlog_exit(status); return status; } int ocfs2_fill_new_dir(struct ocfs2_super *osb, handle_t *handle, struct inode *parent, struct inode *inode, struct buffer_head *fe_bh, struct ocfs2_alloc_context *data_ac) { BUG_ON(!ocfs2_supports_inline_data(osb) && data_ac == NULL); if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) return ocfs2_fill_new_dir_id(osb, handle, parent, inode, fe_bh); return ocfs2_fill_new_dir_el(osb, handle, parent, inode, fe_bh, data_ac); } static void ocfs2_expand_last_dirent(char *start, unsigned int old_size, unsigned int new_size) { struct ocfs2_dir_entry *de; struct ocfs2_dir_entry *prev_de; char *de_buf, *limit; unsigned int bytes = new_size - old_size; limit = start + old_size; de_buf = start; de = (struct ocfs2_dir_entry *)de_buf; do { prev_de = de; de_buf += le16_to_cpu(de->rec_len); de = (struct ocfs2_dir_entry *)de_buf; } while (de_buf < limit); le16_add_cpu(&prev_de->rec_len, bytes); } /* * We allocate enough clusters to fulfill "blocks_wanted", but set * i_size to exactly one block. Ocfs2_extend_dir() will handle the * rest automatically for us. * * *first_block_bh is a pointer to the 1st data block allocated to the * directory. */ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh, unsigned int blocks_wanted, struct buffer_head **first_block_bh) { int ret, credits = OCFS2_INLINE_TO_EXTENTS_CREDITS; u32 alloc, bit_off, len; struct super_block *sb = dir->i_sb; u64 blkno, bytes = blocks_wanted << sb->s_blocksize_bits; struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); struct ocfs2_inode_info *oi = OCFS2_I(dir); struct ocfs2_alloc_context *data_ac; struct buffer_head *dirdata_bh = NULL; struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; handle_t *handle; struct ocfs2_extent_tree et; ocfs2_init_dinode_extent_tree(&et, dir, di_bh); alloc = ocfs2_clusters_for_bytes(sb, bytes); /* * We should never need more than 2 clusters for this - * maximum dirent size is far less than one block. In fact, * the only time we'd need more than one cluster is if * blocksize == clustersize and the dirent won't fit in the * extra space that the expansion to a single block gives. As * of today, that only happens on 4k/4k file systems. */ BUG_ON(alloc > 2); ret = ocfs2_reserve_clusters(osb, alloc, &data_ac); if (ret) { mlog_errno(ret); goto out; } down_write(&oi->ip_alloc_sem); /* * Prepare for worst case allocation scenario of two separate * extents. */ if (alloc == 2) credits += OCFS2_SUBALLOC_ALLOC; handle = ocfs2_start_trans(osb, credits); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); goto out_sem; } /* * Try to claim as many clusters as the bitmap can give though * if we only get one now, that's enough to continue. The rest * will be claimed after the conversion to extents. */ ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len); if (ret) { mlog_errno(ret); goto out_commit; } /* * Operations are carefully ordered so that we set up the new * data block first. The conversion from inline data to * extents follows. */ blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off); dirdata_bh = sb_getblk(sb, blkno); if (!dirdata_bh) { ret = -EIO; mlog_errno(ret); goto out_commit; } ocfs2_set_new_buffer_uptodate(dir, dirdata_bh); ret = ocfs2_journal_access(handle, dir, dirdata_bh, OCFS2_JOURNAL_ACCESS_CREATE); if (ret) { mlog_errno(ret); goto out_commit; } memcpy(dirdata_bh->b_data, di->id2.i_data.id_data, i_size_read(dir)); memset(dirdata_bh->b_data + i_size_read(dir), 0, sb->s_blocksize - i_size_read(dir)); ocfs2_expand_last_dirent(dirdata_bh->b_data, i_size_read(dir), sb->s_blocksize); ret = ocfs2_journal_dirty(handle, dirdata_bh); if (ret) { mlog_errno(ret); goto out_commit; } /* * Set extent, i_size, etc on the directory. After this, the * inode should contain the same exact dirents as before and * be fully accessible from system calls. * * We let the later dirent insert modify c/mtime - to the user * the data hasn't changed. */ ret = ocfs2_journal_access(handle, dir, di_bh, OCFS2_JOURNAL_ACCESS_CREATE); if (ret) { mlog_errno(ret); goto out_commit; } spin_lock(&oi->ip_lock); oi->ip_dyn_features &= ~OCFS2_INLINE_DATA_FL; di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); spin_unlock(&oi->ip_lock); ocfs2_dinode_new_extent_list(dir, di); i_size_write(dir, sb->s_blocksize); dir->i_mtime = dir->i_ctime = CURRENT_TIME; di->i_size = cpu_to_le64(sb->s_blocksize); di->i_ctime = di->i_mtime = cpu_to_le64(dir->i_ctime.tv_sec); di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(dir->i_ctime.tv_nsec); /* * This should never fail as our extent list is empty and all * related blocks have been journaled already. */ ret = ocfs2_insert_extent(osb, handle, dir, &et, 0, blkno, len, 0, NULL); if (ret) { mlog_errno(ret); goto out_commit; } /* * Set i_blocks after the extent insert for the most up to * date ip_clusters value. */ dir->i_blocks = ocfs2_inode_sector_count(dir); ret = ocfs2_journal_dirty(handle, di_bh); if (ret) { mlog_errno(ret); goto out_commit; } /* * We asked for two clusters, but only got one in the 1st * pass. Claim the 2nd cluster as a separate extent. */ if (alloc > len) { ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len); if (ret) { mlog_errno(ret); goto out_commit; } blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off); ret = ocfs2_insert_extent(osb, handle, dir, &et, 1, blkno, len, 0, NULL); if (ret) { mlog_errno(ret); goto out_commit; } } *first_block_bh = dirdata_bh; dirdata_bh = NULL; out_commit: ocfs2_commit_trans(osb, handle); out_sem: up_write(&oi->ip_alloc_sem); out: if (data_ac) ocfs2_free_alloc_context(data_ac); brelse(dirdata_bh); return ret; } /* returns a bh of the 1st new block in the allocation. */ static int ocfs2_do_extend_dir(struct super_block *sb, handle_t *handle, struct inode *dir, struct buffer_head *parent_fe_bh, struct ocfs2_alloc_context *data_ac, struct ocfs2_alloc_context *meta_ac, struct buffer_head **new_bh) { int status; int extend; u64 p_blkno, v_blkno; spin_lock(&OCFS2_I(dir)->ip_lock); extend = (i_size_read(dir) == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)); spin_unlock(&OCFS2_I(dir)->ip_lock); if (extend) { u32 offset = OCFS2_I(dir)->ip_clusters; status = ocfs2_add_inode_data(OCFS2_SB(sb), dir, &offset, 1, 0, parent_fe_bh, handle, data_ac, meta_ac, NULL); BUG_ON(status == -EAGAIN); if (status < 0) { mlog_errno(status); goto bail; } } v_blkno = ocfs2_blocks_for_bytes(sb, i_size_read(dir)); status = ocfs2_extent_map_get_blocks(dir, v_blkno, &p_blkno, NULL, NULL); if (status < 0) { mlog_errno(status); goto bail; } *new_bh = sb_getblk(sb, p_blkno); if (!*new_bh) { status = -EIO; mlog_errno(status); goto bail; } status = 0; bail: mlog_exit(status); return status; } /* * Assumes you already have a cluster lock on the directory. * * 'blocks_wanted' is only used if we have an inline directory which * is to be turned into an extent based one. The size of the dirent to * insert might be larger than the space gained by growing to just one * block, so we may have to grow the inode by two blocks in that case. */ static int ocfs2_extend_dir(struct ocfs2_super *osb, struct inode *dir, struct buffer_head *parent_fe_bh, unsigned int blocks_wanted, struct buffer_head **new_de_bh) { int status = 0; int credits, num_free_extents, drop_alloc_sem = 0; loff_t dir_i_size; struct ocfs2_dinode *fe = (struct ocfs2_dinode *) parent_fe_bh->b_data; struct ocfs2_extent_list *el = &fe->id2.i_list; struct ocfs2_alloc_context *data_ac = NULL; struct ocfs2_alloc_context *meta_ac = NULL; handle_t *handle = NULL; struct buffer_head *new_bh = NULL; struct ocfs2_dir_entry * de; struct super_block *sb = osb->sb; struct ocfs2_extent_tree et; mlog_entry_void(); if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { status = ocfs2_expand_inline_dir(dir, parent_fe_bh, blocks_wanted, &new_bh); if (status) { mlog_errno(status); goto bail; } if (blocks_wanted == 1) { /* * If the new dirent will fit inside the space * created by pushing out to one block, then * we can complete the operation * here. Otherwise we have to expand i_size * and format the 2nd block below. */ BUG_ON(new_bh == NULL); goto bail_bh; } /* * Get rid of 'new_bh' - we want to format the 2nd * data block and return that instead. */ brelse(new_bh); new_bh = NULL; dir_i_size = i_size_read(dir); credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS; goto do_extend; } dir_i_size = i_size_read(dir); mlog(0, "extending dir %llu (i_size = %lld)\n", (unsigned long long)OCFS2_I(dir)->ip_blkno, dir_i_size); /* dir->i_size is always block aligned. */ spin_lock(&OCFS2_I(dir)->ip_lock); if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) { spin_unlock(&OCFS2_I(dir)->ip_lock); ocfs2_init_dinode_extent_tree(&et, dir, parent_fe_bh); num_free_extents = ocfs2_num_free_extents(osb, dir, &et); if (num_free_extents < 0) { status = num_free_extents; mlog_errno(status); goto bail; } if (!num_free_extents) { status = ocfs2_reserve_new_metadata(osb, el, &meta_ac); if (status < 0) { if (status != -ENOSPC) mlog_errno(status); goto bail; } } status = ocfs2_reserve_clusters(osb, 1, &data_ac); if (status < 0) { if (status != -ENOSPC) mlog_errno(status); goto bail; } credits = ocfs2_calc_extend_credits(sb, el, 1); } else { spin_unlock(&OCFS2_I(dir)->ip_lock); credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS; } do_extend: down_write(&OCFS2_I(dir)->ip_alloc_sem); drop_alloc_sem = 1; handle = ocfs2_start_trans(osb, credits); if (IS_ERR(handle)) { status = PTR_ERR(handle); handle = NULL; mlog_errno(status); goto bail; } status = ocfs2_do_extend_dir(osb->sb, handle, dir, parent_fe_bh, data_ac, meta_ac, &new_bh); if (status < 0) { mlog_errno(status); goto bail; } ocfs2_set_new_buffer_uptodate(dir, new_bh); status = ocfs2_journal_access(handle, dir, new_bh, OCFS2_JOURNAL_ACCESS_CREATE); if (status < 0) { mlog_errno(status); goto bail; } memset(new_bh->b_data, 0, sb->s_blocksize); de = (struct ocfs2_dir_entry *) new_bh->b_data; de->inode = 0; de->rec_len = cpu_to_le16(sb->s_blocksize); status = ocfs2_journal_dirty(handle, new_bh); if (status < 0) { mlog_errno(status); goto bail; } dir_i_size += dir->i_sb->s_blocksize; i_size_write(dir, dir_i_size); dir->i_blocks = ocfs2_inode_sector_count(dir); status = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh); if (status < 0) { mlog_errno(status); goto bail; } bail_bh: *new_de_bh = new_bh; get_bh(*new_de_bh); bail: if (drop_alloc_sem) up_write(&OCFS2_I(dir)->ip_alloc_sem); if (handle) ocfs2_commit_trans(osb, handle); if (data_ac) ocfs2_free_alloc_context(data_ac); if (meta_ac) ocfs2_free_alloc_context(meta_ac); brelse(new_bh); mlog_exit(status); return status; } static int ocfs2_find_dir_space_id(struct inode *dir, struct buffer_head *di_bh, const char *name, int namelen, struct buffer_head **ret_de_bh, unsigned int *blocks_wanted) { int ret; struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; struct ocfs2_dir_entry *de, *last_de = NULL; char *de_buf, *limit; unsigned long offset = 0; unsigned int rec_len, new_rec_len; de_buf = di->id2.i_data.id_data; limit = de_buf + i_size_read(dir); rec_len = OCFS2_DIR_REC_LEN(namelen); while (de_buf < limit) { de = (struct ocfs2_dir_entry *)de_buf; if (!ocfs2_check_dir_entry(dir, de, di_bh, offset)) { ret = -ENOENT; goto out; } if (ocfs2_match(namelen, name, de)) { ret = -EEXIST; goto out; } if (ocfs2_dirent_would_fit(de, rec_len)) { /* Ok, we found a spot. Return this bh and let * the caller actually fill it in. */ *ret_de_bh = di_bh; get_bh(*ret_de_bh); ret = 0; goto out; } last_de = de; de_buf += le16_to_cpu(de->rec_len); offset += le16_to_cpu(de->rec_len); } /* * We're going to require expansion of the directory - figure * out how many blocks we'll need so that a place for the * dirent can be found. */ *blocks_wanted = 1; new_rec_len = le16_to_cpu(last_de->rec_len) + (dir->i_sb->s_blocksize - i_size_read(dir)); if (new_rec_len < (rec_len + OCFS2_DIR_REC_LEN(last_de->name_len))) *blocks_wanted = 2; ret = -ENOSPC; out: return ret; } static int ocfs2_find_dir_space_el(struct inode *dir, const char *name, int namelen, struct buffer_head **ret_de_bh) { unsigned long offset; struct buffer_head *bh = NULL; unsigned short rec_len; struct ocfs2_dir_entry *de; struct super_block *sb = dir->i_sb; int status; bh = ocfs2_bread(dir, 0, &status, 0); if (!bh) { mlog_errno(status); goto bail; } rec_len = OCFS2_DIR_REC_LEN(namelen); offset = 0; de = (struct ocfs2_dir_entry *) bh->b_data; while (1) { if ((char *)de >= sb->s_blocksize + bh->b_data) { brelse(bh); bh = NULL; if (i_size_read(dir) <= offset) { /* * Caller will have to expand this * directory. */ status = -ENOSPC; goto bail; } bh = ocfs2_bread(dir, offset >> sb->s_blocksize_bits, &status, 0); if (!bh) { mlog_errno(status); goto bail; } /* move to next block */ de = (struct ocfs2_dir_entry *) bh->b_data; } if (!ocfs2_check_dir_entry(dir, de, bh, offset)) { status = -ENOENT; goto bail; } if (ocfs2_match(namelen, name, de)) { status = -EEXIST; goto bail; } if (ocfs2_dirent_would_fit(de, rec_len)) { /* Ok, we found a spot. Return this bh and let * the caller actually fill it in. */ *ret_de_bh = bh; get_bh(*ret_de_bh); status = 0; goto bail; } offset += le16_to_cpu(de->rec_len); de = (struct ocfs2_dir_entry *)((char *) de + le16_to_cpu(de->rec_len)); } status = 0; bail: brelse(bh); mlog_exit(status); return status; } int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb, struct inode *dir, struct buffer_head *parent_fe_bh, const char *name, int namelen, struct buffer_head **ret_de_bh) { int ret; unsigned int blocks_wanted = 1; struct buffer_head *bh = NULL; mlog(0, "getting ready to insert namelen %d into dir %llu\n", namelen, (unsigned long long)OCFS2_I(dir)->ip_blkno); *ret_de_bh = NULL; if (!namelen) { ret = -EINVAL; mlog_errno(ret); goto out; } if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { ret = ocfs2_find_dir_space_id(dir, parent_fe_bh, name, namelen, &bh, &blocks_wanted); } else ret = ocfs2_find_dir_space_el(dir, name, namelen, &bh); if (ret && ret != -ENOSPC) { mlog_errno(ret); goto out; } if (ret == -ENOSPC) { /* * We have to expand the directory to add this name. */ BUG_ON(bh); ret = ocfs2_extend_dir(osb, dir, parent_fe_bh, blocks_wanted, &bh); if (ret) { if (ret != -ENOSPC) mlog_errno(ret); goto out; } BUG_ON(!bh); } *ret_de_bh = bh; bh = NULL; out: brelse(bh); return ret; }