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author | Mark Fasheh <mark.fasheh@oracle.com> | 2005-12-15 14:31:24 -0800 |
---|---|---|
committer | Joel Becker <joel.becker@oracle.com> | 2006-01-03 11:45:47 -0800 |
commit | ccd979bdbce9fba8412beb3f1de68a9d0171b12c (patch) | |
tree | c50ed941849ce06ccadd4ce27599b3ef9fdbe2ae /fs/ocfs2/namei.c | |
parent | 8df08c89c668e1bd922a053fdb5ba1fadbecbb38 (diff) | |
download | kernel_samsung_smdk4412-ccd979bdbce9fba8412beb3f1de68a9d0171b12c.zip kernel_samsung_smdk4412-ccd979bdbce9fba8412beb3f1de68a9d0171b12c.tar.gz kernel_samsung_smdk4412-ccd979bdbce9fba8412beb3f1de68a9d0171b12c.tar.bz2 |
[PATCH] OCFS2: The Second Oracle Cluster Filesystem
The OCFS2 file system module.
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Diffstat (limited to 'fs/ocfs2/namei.c')
-rw-r--r-- | fs/ocfs2/namei.c | 2264 |
1 files changed, 2264 insertions, 0 deletions
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c new file mode 100644 index 0000000..f6b77ff --- /dev/null +++ b/fs/ocfs2/namei.c @@ -0,0 +1,2264 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * namei.c + * + * Create and rename file, directory, symlinks + * + * 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 <linux/fs.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/highmem.h> + +#define MLOG_MASK_PREFIX ML_NAMEI +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "dcache.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 "symlink.h" +#include "sysfile.h" +#include "uptodate.h" +#include "vote.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 int inline ocfs2_search_dirblock(struct buffer_head *bh, + struct inode *dir, + const char *name, int namelen, + unsigned long offset, + struct ocfs2_dir_entry **res_dir); + +static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle, + struct inode *dir, + struct ocfs2_dir_entry *de_del, + struct buffer_head *bh); + +static int __ocfs2_add_entry(struct ocfs2_journal_handle *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); + +static int ocfs2_mknod_locked(struct ocfs2_super *osb, + struct inode *dir, + struct dentry *dentry, int mode, + dev_t dev, + struct buffer_head **new_fe_bh, + struct buffer_head *parent_fe_bh, + struct ocfs2_journal_handle *handle, + struct inode **ret_inode, + struct ocfs2_alloc_context *inode_ac); + +static int ocfs2_fill_new_dir(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *parent, + struct inode *inode, + struct buffer_head *fe_bh, + struct ocfs2_alloc_context *data_ac); + +static int ocfs2_double_lock(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct buffer_head **bh1, + struct inode *inode1, + struct buffer_head **bh2, + struct inode *inode2); + +static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + char *name, + struct buffer_head **de_bh); + +static int ocfs2_orphan_add(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + struct ocfs2_dinode *fe, + char *name, + struct buffer_head *de_bh); + +static int ocfs2_create_symlink_data(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + const char *symname); + +static inline int ocfs2_add_entry(struct ocfs2_journal_handle *handle, + struct dentry *dentry, + struct inode *inode, u64 blkno, + struct buffer_head *parent_fe_bh, + struct buffer_head *insert_bh) +{ + return __ocfs2_add_entry(handle, dentry->d_parent->d_inode, + dentry->d_name.name, dentry->d_name.len, + inode, blkno, parent_fe_bh, insert_bh); +} + +/* An orphan dir name is an 8 byte value, printed as a hex string */ +#define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64))) + +static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry, + struct nameidata *nd) +{ + int status; + u64 blkno; + struct buffer_head *dirent_bh = NULL; + struct inode *inode = NULL; + struct dentry *ret; + struct ocfs2_dir_entry *dirent; + struct ocfs2_inode_info *oi; + + mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry, + dentry->d_name.len, dentry->d_name.name); + + if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) { + ret = ERR_PTR(-ENAMETOOLONG); + goto bail; + } + + mlog(0, "find name %.*s in directory %"MLFu64"\n", dentry->d_name.len, + dentry->d_name.name, OCFS2_I(dir)->ip_blkno); + + status = ocfs2_meta_lock(dir, NULL, NULL, 0); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + ret = ERR_PTR(status); + goto bail; + } + + status = ocfs2_find_files_on_disk(dentry->d_name.name, + dentry->d_name.len, &blkno, + dir, &dirent_bh, &dirent); + if (status < 0) + goto bail_add; + + inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno); + if (IS_ERR(inode)) { + mlog(ML_ERROR, "Unable to create inode %"MLFu64"\n", blkno); + ret = ERR_PTR(-EACCES); + goto bail_unlock; + } + + oi = OCFS2_I(inode); + /* Clear any orphaned state... If we were able to look up the + * inode from a directory, it certainly can't be orphaned. We + * might have the bad state from a node which intended to + * orphan this inode but crashed before it could commit the + * unlink. */ + spin_lock(&oi->ip_lock); + oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED; + oi->ip_orphaned_slot = OCFS2_INVALID_SLOT; + spin_unlock(&oi->ip_lock); + +bail_add: + + dentry->d_op = &ocfs2_dentry_ops; + ret = d_splice_alias(inode, dentry); + +bail_unlock: + /* Don't drop the cluster lock until *after* the d_add -- + * unlink on another node will message us to remove that + * dentry under this lock so otherwise we can race this with + * the vote thread and have a stale dentry. */ + ocfs2_meta_unlock(dir, 0); + +bail: + if (dirent_bh) + brelse(dirent_bh); + + mlog_exit_ptr(ret); + + return ret; +} + +static int ocfs2_fill_new_dir(struct ocfs2_super *osb, + struct ocfs2_journal_handle *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; + struct ocfs2_dir_entry *de = 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); + + de = (struct ocfs2_dir_entry *) new_bh->b_data; + 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(inode->i_sb->s_blocksize - + OCFS2_DIR_REC_LEN(1)); + de->name_len = 2; + strcpy(de->name, ".."); + ocfs2_set_de_type(de, S_IFDIR); + + 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_align_bytes_to_sectors(inode->i_sb->s_blocksize); + status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = 0; +bail: + if (new_bh) + brelse(new_bh); + + mlog_exit(status); + return status; +} + +static int ocfs2_mknod(struct inode *dir, + struct dentry *dentry, + int mode, + dev_t dev) +{ + int status = 0; + struct buffer_head *parent_fe_bh = NULL; + struct ocfs2_journal_handle *handle = NULL; + struct ocfs2_super *osb; + struct ocfs2_dinode *dirfe; + struct buffer_head *new_fe_bh = NULL; + struct buffer_head *de_bh = NULL; + struct inode *inode = NULL; + struct ocfs2_alloc_context *inode_ac = NULL; + struct ocfs2_alloc_context *data_ac = NULL; + + mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode, + (unsigned long)dev, dentry->d_name.len, + dentry->d_name.name); + + /* get our super block */ + osb = OCFS2_SB(dir->i_sb); + + if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) { + mlog(ML_ERROR, "inode %"MLFu64" has i_nlink of %u\n", + OCFS2_I(dir)->ip_blkno, dir->i_nlink); + status = -EMLINK; + goto leave; + } + + handle = ocfs2_alloc_handle(osb); + if (handle == NULL) { + status = -ENOMEM; + mlog_errno(status); + goto leave; + } + + status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto leave; + } + + dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data; + if (!dirfe->i_links_count) { + /* can't make a file in a deleted directory. */ + status = -ENOENT; + goto leave; + } + + status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name, + dentry->d_name.len); + if (status) + goto leave; + + /* get a spot inside the dir. */ + status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh, + dentry->d_name.name, + dentry->d_name.len, &de_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + /* reserve an inode spot */ + status = ocfs2_reserve_new_inode(osb, handle, &inode_ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto leave; + } + + /* are we making a directory? If so, reserve a cluster for his + * 1st extent. */ + if (S_ISDIR(mode)) { + status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto leave; + } + } + + handle = ocfs2_start_trans(osb, handle, OCFS2_MKNOD_CREDITS); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto leave; + } + + /* do the real work now. */ + status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev, + &new_fe_bh, parent_fe_bh, handle, + &inode, inode_ac); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + if (S_ISDIR(mode)) { + status = ocfs2_fill_new_dir(osb, handle, dir, inode, + new_fe_bh, data_ac); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = ocfs2_journal_access(handle, dir, parent_fe_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto leave; + } + le16_add_cpu(&dirfe->i_links_count, 1); + status = ocfs2_journal_dirty(handle, parent_fe_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + dir->i_nlink++; + } + + status = ocfs2_add_entry(handle, dentry, inode, + OCFS2_I(inode)->ip_blkno, parent_fe_bh, + de_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + insert_inode_hash(inode); + dentry->d_op = &ocfs2_dentry_ops; + d_instantiate(dentry, inode); + status = 0; +leave: + if (handle) + ocfs2_commit_trans(handle); + + if (status == -ENOSPC) + mlog(0, "Disk is full\n"); + + if (new_fe_bh) + brelse(new_fe_bh); + + if (de_bh) + brelse(de_bh); + + if (parent_fe_bh) + brelse(parent_fe_bh); + + if ((status < 0) && inode) + iput(inode); + + if (inode_ac) + ocfs2_free_alloc_context(inode_ac); + + if (data_ac) + ocfs2_free_alloc_context(data_ac); + + mlog_exit(status); + + return status; +} + +static int ocfs2_mknod_locked(struct ocfs2_super *osb, + struct inode *dir, + struct dentry *dentry, int mode, + dev_t dev, + struct buffer_head **new_fe_bh, + struct buffer_head *parent_fe_bh, + struct ocfs2_journal_handle *handle, + struct inode **ret_inode, + struct ocfs2_alloc_context *inode_ac) +{ + int status = 0; + struct ocfs2_dinode *fe = NULL; + struct ocfs2_extent_list *fel; + u64 fe_blkno = 0; + u16 suballoc_bit; + struct inode *inode = NULL; + + mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode, + (unsigned long)dev, dentry->d_name.len, + dentry->d_name.name); + + *new_fe_bh = NULL; + *ret_inode = NULL; + + status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit, + &fe_blkno); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + inode = new_inode(dir->i_sb); + if (IS_ERR(inode)) { + status = PTR_ERR(inode); + mlog(ML_ERROR, "new_inode failed!\n"); + goto leave; + } + + /* populate as many fields early on as possible - many of + * these are used by the support functions here and in + * callers. */ + inode->i_ino = ino_from_blkno(osb->sb, fe_blkno); + OCFS2_I(inode)->ip_blkno = fe_blkno; + if (S_ISDIR(mode)) + inode->i_nlink = 2; + else + inode->i_nlink = 1; + inode->i_mode = mode; + spin_lock(&osb->osb_lock); + inode->i_generation = osb->s_next_generation++; + spin_unlock(&osb->osb_lock); + + *new_fe_bh = sb_getblk(osb->sb, fe_blkno); + if (!*new_fe_bh) { + status = -EIO; + mlog_errno(status); + goto leave; + } + ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh); + + status = ocfs2_journal_access(handle, inode, *new_fe_bh, + OCFS2_JOURNAL_ACCESS_CREATE); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data; + memset(fe, 0, osb->sb->s_blocksize); + + fe->i_generation = cpu_to_le32(inode->i_generation); + fe->i_fs_generation = cpu_to_le32(osb->fs_generation); + fe->i_blkno = cpu_to_le64(fe_blkno); + fe->i_suballoc_bit = cpu_to_le16(suballoc_bit); + fe->i_suballoc_slot = cpu_to_le16(osb->slot_num); + fe->i_uid = cpu_to_le32(current->fsuid); + if (dir->i_mode & S_ISGID) { + fe->i_gid = cpu_to_le32(dir->i_gid); + if (S_ISDIR(mode)) + mode |= S_ISGID; + } else + fe->i_gid = cpu_to_le32(current->fsgid); + fe->i_mode = cpu_to_le16(mode); + if (S_ISCHR(mode) || S_ISBLK(mode)) + fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev)); + + fe->i_links_count = cpu_to_le16(inode->i_nlink); + + fe->i_last_eb_blk = 0; + strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE); + le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL); + fe->i_atime = fe->i_ctime = fe->i_mtime = + cpu_to_le64(CURRENT_TIME.tv_sec); + fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec = + cpu_to_le32(CURRENT_TIME.tv_nsec); + fe->i_dtime = 0; + + fel = &fe->id2.i_list; + fel->l_tree_depth = 0; + fel->l_next_free_rec = 0; + fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb)); + + status = ocfs2_journal_dirty(handle, *new_fe_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + if (ocfs2_populate_inode(inode, fe, 1) < 0) { + mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, " + "i_blkno=%"MLFu64", i_ino=%lu\n", + (unsigned long long) (*new_fe_bh)->b_blocknr, + fe->i_blkno, inode->i_ino); + BUG(); + } + + ocfs2_inode_set_new(osb, inode); + status = ocfs2_create_new_inode_locks(inode); + if (status < 0) + mlog_errno(status); + + status = 0; /* error in ocfs2_create_new_inode_locks is not + * critical */ + + *ret_inode = inode; +leave: + if (status < 0) { + if (*new_fe_bh) { + brelse(*new_fe_bh); + *new_fe_bh = NULL; + } + if (inode) + iput(inode); + } + + mlog_exit(status); + return status; +} + +static int ocfs2_mkdir(struct inode *dir, + struct dentry *dentry, + int mode) +{ + int ret; + + mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode, + dentry->d_name.len, dentry->d_name.name); + ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0); + mlog_exit(ret); + + return ret; +} + +static int ocfs2_create(struct inode *dir, + struct dentry *dentry, + int mode, + struct nameidata *nd) +{ + int ret; + + mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode, + dentry->d_name.len, dentry->d_name.name); + ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0); + mlog_exit(ret); + + return ret; +} + +static int ocfs2_link(struct dentry *old_dentry, + struct inode *dir, + struct dentry *dentry) +{ + struct ocfs2_journal_handle *handle = NULL; + struct inode *inode = old_dentry->d_inode; + int err; + struct buffer_head *fe_bh = NULL; + struct buffer_head *parent_fe_bh = NULL; + struct buffer_head *de_bh = NULL; + struct ocfs2_dinode *fe = NULL; + struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); + + mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino, + old_dentry->d_name.len, old_dentry->d_name.name, + dentry->d_name.len, dentry->d_name.name); + + if (S_ISDIR(inode->i_mode)) { + err = -EPERM; + goto bail; + } + + if (inode->i_nlink >= OCFS2_LINK_MAX) { + err = -EMLINK; + goto bail; + } + + handle = ocfs2_alloc_handle(osb); + if (handle == NULL) { + err = -ENOMEM; + goto bail; + } + + err = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1); + if (err < 0) { + if (err != -ENOENT) + mlog_errno(err); + goto bail; + } + + err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name, + dentry->d_name.len); + if (err) + goto bail; + + err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh, + dentry->d_name.name, + dentry->d_name.len, &de_bh); + if (err < 0) { + mlog_errno(err); + goto bail; + } + + err = ocfs2_meta_lock(inode, handle, &fe_bh, 1); + if (err < 0) { + if (err != -ENOENT) + mlog_errno(err); + goto bail; + } + + fe = (struct ocfs2_dinode *) fe_bh->b_data; + if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) { + err = -EMLINK; + goto bail; + } + + handle = ocfs2_start_trans(osb, handle, OCFS2_LINK_CREDITS); + if (IS_ERR(handle)) { + err = PTR_ERR(handle); + handle = NULL; + mlog_errno(err); + goto bail; + } + + err = ocfs2_journal_access(handle, inode, fe_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (err < 0) { + mlog_errno(err); + goto bail; + } + + inode->i_nlink++; + inode->i_ctime = CURRENT_TIME; + fe->i_links_count = cpu_to_le16(inode->i_nlink); + fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); + fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); + + err = ocfs2_journal_dirty(handle, fe_bh); + if (err < 0) { + le16_add_cpu(&fe->i_links_count, -1); + inode->i_nlink--; + mlog_errno(err); + goto bail; + } + + err = ocfs2_add_entry(handle, dentry, inode, + OCFS2_I(inode)->ip_blkno, + parent_fe_bh, de_bh); + if (err) { + le16_add_cpu(&fe->i_links_count, -1); + inode->i_nlink--; + mlog_errno(err); + goto bail; + } + + atomic_inc(&inode->i_count); + dentry->d_op = &ocfs2_dentry_ops; + d_instantiate(dentry, inode); +bail: + if (handle) + ocfs2_commit_trans(handle); + if (de_bh) + brelse(de_bh); + if (fe_bh) + brelse(fe_bh); + if (parent_fe_bh) + brelse(parent_fe_bh); + + mlog_exit(err); + + return err; +} + +static int ocfs2_unlink(struct inode *dir, + struct dentry *dentry) +{ + int status; + unsigned int saved_nlink = 0; + struct inode *inode = dentry->d_inode; + struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); + u64 blkno; + struct ocfs2_dinode *fe = NULL; + struct buffer_head *fe_bh = NULL; + struct buffer_head *parent_node_bh = NULL; + struct ocfs2_journal_handle *handle = NULL; + struct ocfs2_dir_entry *dirent = NULL; + struct buffer_head *dirent_bh = NULL; + char orphan_name[OCFS2_ORPHAN_NAMELEN + 1]; + struct buffer_head *orphan_entry_bh = NULL; + + mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry, + dentry->d_name.len, dentry->d_name.name); + + BUG_ON(dentry->d_parent->d_inode != dir); + + mlog(0, "ino = %"MLFu64"\n", OCFS2_I(inode)->ip_blkno); + + if (inode == osb->root_inode) { + mlog(0, "Cannot delete the root directory\n"); + status = -EPERM; + goto leave; + } + + handle = ocfs2_alloc_handle(osb); + if (handle == NULL) { + status = -ENOMEM; + mlog_errno(status); + goto leave; + } + + status = ocfs2_meta_lock(dir, handle, &parent_node_bh, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto leave; + } + + status = ocfs2_find_files_on_disk(dentry->d_name.name, + dentry->d_name.len, &blkno, + dir, &dirent_bh, &dirent); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto leave; + } + + if (OCFS2_I(inode)->ip_blkno != blkno) { + status = -ENOENT; + + mlog(0, "ip_blkno (%"MLFu64") != dirent blkno (%"MLFu64") " + "ip_flags = %x\n", OCFS2_I(inode)->ip_blkno, blkno, + OCFS2_I(inode)->ip_flags); + goto leave; + } + + status = ocfs2_meta_lock(inode, handle, &fe_bh, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto leave; + } + + if (S_ISDIR(inode->i_mode)) { + if (!ocfs2_empty_dir(inode)) { + status = -ENOTEMPTY; + goto leave; + } else if (inode->i_nlink != 2) { + status = -ENOTEMPTY; + goto leave; + } + } + + /* There are still a few steps left until we can consider the + * unlink to have succeeded. Save off nlink here before + * modification so we can set it back in case we hit an issue + * before commit. */ + saved_nlink = inode->i_nlink; + if (S_ISDIR(inode->i_mode)) + inode->i_nlink = 0; + else + inode->i_nlink--; + + status = ocfs2_request_unlink_vote(inode, dentry, + (unsigned int) inode->i_nlink); + if (status < 0) { + /* This vote should succeed under all normal + * circumstances. */ + mlog_errno(status); + goto leave; + } + + if (!inode->i_nlink) { + status = ocfs2_prepare_orphan_dir(osb, handle, inode, + orphan_name, + &orphan_entry_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + } + + handle = ocfs2_start_trans(osb, handle, OCFS2_UNLINK_CREDITS); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto leave; + } + + status = ocfs2_journal_access(handle, inode, fe_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + fe = (struct ocfs2_dinode *) fe_bh->b_data; + + if (!inode->i_nlink) { + status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name, + orphan_entry_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + } + + /* delete the name from the parent dir */ + status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + /* We can set nlink on the dinode now. clear the saved version + * so that it doesn't get set later. */ + fe->i_links_count = cpu_to_le16(inode->i_nlink); + saved_nlink = 0; + + status = ocfs2_journal_dirty(handle, fe_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + if (S_ISDIR(inode->i_mode)) { + dir->i_nlink--; + status = ocfs2_mark_inode_dirty(handle, dir, + parent_node_bh); + if (status < 0) { + mlog_errno(status); + dir->i_nlink++; + } + } + +leave: + if (status < 0 && saved_nlink) + inode->i_nlink = saved_nlink; + + if (handle) + ocfs2_commit_trans(handle); + + if (fe_bh) + brelse(fe_bh); + + if (dirent_bh) + brelse(dirent_bh); + + if (parent_node_bh) + brelse(parent_node_bh); + + if (orphan_entry_bh) + brelse(orphan_entry_bh); + + mlog_exit(status); + + return status; +} + +/* + * The only place this should be used is rename! + * if they have the same id, then the 1st one is the only one locked. + */ +static int ocfs2_double_lock(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct buffer_head **bh1, + struct inode *inode1, + struct buffer_head **bh2, + struct inode *inode2) +{ + int status; + struct ocfs2_inode_info *oi1 = OCFS2_I(inode1); + struct ocfs2_inode_info *oi2 = OCFS2_I(inode2); + struct buffer_head **tmpbh; + struct inode *tmpinode; + + mlog_entry("(inode1 = %"MLFu64", inode2 = %"MLFu64")\n", + oi1->ip_blkno, oi2->ip_blkno); + + BUG_ON(!handle); + + if (*bh1) + *bh1 = NULL; + if (*bh2) + *bh2 = NULL; + + /* we always want to lock the one with the lower lockid first. */ + if (oi1->ip_blkno != oi2->ip_blkno) { + if (oi1->ip_blkno < oi2->ip_blkno) { + /* switch id1 and id2 around */ + mlog(0, "switching them around...\n"); + tmpbh = bh2; + bh2 = bh1; + bh1 = tmpbh; + + tmpinode = inode2; + inode2 = inode1; + inode1 = tmpinode; + } + /* lock id2 */ + status = ocfs2_meta_lock(inode2, handle, bh2, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto bail; + } + } + /* lock id1 */ + status = ocfs2_meta_lock(inode1, handle, bh1, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto bail; + } +bail: + mlog_exit(status); + return status; +} + +#define PARENT_INO(buffer) \ + ((struct ocfs2_dir_entry *) \ + ((char *)buffer + \ + le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode + +static int ocfs2_rename(struct inode *old_dir, + struct dentry *old_dentry, + struct inode *new_dir, + struct dentry *new_dentry) +{ + int status = 0, rename_lock = 0; + struct inode *old_inode = old_dentry->d_inode; + struct inode *new_inode = new_dentry->d_inode; + struct ocfs2_dinode *newfe = NULL; + char orphan_name[OCFS2_ORPHAN_NAMELEN + 1]; + struct buffer_head *orphan_entry_bh = NULL; + struct buffer_head *newfe_bh = NULL; + struct buffer_head *insert_entry_bh = NULL; + struct ocfs2_super *osb = NULL; + u64 newfe_blkno; + struct ocfs2_journal_handle *handle = NULL; + struct buffer_head *old_dir_bh = NULL; + struct buffer_head *new_dir_bh = NULL; + struct ocfs2_dir_entry *old_de = NULL, *new_de = NULL; // dirent for old_dentry + // and new_dentry + struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above + struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir, + // this is the 1st dirent bh + nlink_t old_dir_nlink = old_dir->i_nlink, new_dir_nlink = new_dir->i_nlink; + unsigned int links_count; + + /* At some point it might be nice to break this function up a + * bit. */ + + mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n", + old_dir, old_dentry, new_dir, new_dentry, + old_dentry->d_name.len, old_dentry->d_name.name, + new_dentry->d_name.len, new_dentry->d_name.name); + + osb = OCFS2_SB(old_dir->i_sb); + + if (new_inode) { + if (!igrab(new_inode)) + BUG(); + } + + if (atomic_read(&old_dentry->d_count) > 2) { + shrink_dcache_parent(old_dentry); + if (atomic_read(&old_dentry->d_count) > 2) { + status = -EBUSY; + goto bail; + } + } + + /* Assume a directory heirarchy thusly: + * a/b/c + * a/d + * a,b,c, and d are all directories. + * + * from cwd of 'a' on both nodes: + * node1: mv b/c d + * node2: mv d b/c + * + * And that's why, just like the VFS, we need a file system + * rename lock. */ + if (old_dentry != new_dentry) { + status = ocfs2_rename_lock(osb); + if (status < 0) { + mlog_errno(status); + goto bail; + } + rename_lock = 1; + } + + handle = ocfs2_alloc_handle(osb); + if (handle == NULL) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + /* if old and new are the same, this'll just do one lock. */ + status = ocfs2_double_lock(osb, handle, + &old_dir_bh, old_dir, + &new_dir_bh, new_dir); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* make sure both dirs have bhs + * get an extra ref on old_dir_bh if old==new */ + if (!new_dir_bh) { + if (old_dir_bh) { + new_dir_bh = old_dir_bh; + get_bh(new_dir_bh); + } else { + mlog(ML_ERROR, "no old_dir_bh!\n"); + status = -EIO; + goto bail; + } + } + + if (S_ISDIR(old_inode->i_mode)) { + /* Directories actually require metadata updates to + * the directory info so we can't get away with not + * doing node locking on it. */ + status = ocfs2_meta_lock(old_inode, handle, NULL, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto bail; + } + + status = ocfs2_request_rename_vote(old_inode, old_dentry); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = -EIO; + old_inode_de_bh = ocfs2_bread(old_inode, 0, &status, 0); + if (!old_inode_de_bh) + goto bail; + + status = -EIO; + if (le64_to_cpu(PARENT_INO(old_inode_de_bh->b_data)) != + OCFS2_I(old_dir)->ip_blkno) + goto bail; + status = -EMLINK; + if (!new_inode && new_dir!=old_dir && + new_dir->i_nlink >= OCFS2_LINK_MAX) + goto bail; + } else { + /* Ah, the simple case - we're a file so just send a + * message. */ + status = ocfs2_request_rename_vote(old_inode, old_dentry); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + status = -ENOENT; + old_de_bh = ocfs2_find_entry(old_dentry->d_name.name, + old_dentry->d_name.len, + old_dir, &old_de); + if (!old_de_bh) + goto bail; + + /* + * Check for inode number is _not_ due to possible IO errors. + * We might rmdir the source, keep it as pwd of some process + * and merrily kill the link to whatever was created under the + * same name. Goodbye sticky bit ;-< + */ + if (le64_to_cpu(old_de->inode) != OCFS2_I(old_inode)->ip_blkno) + goto bail; + + /* check if the target already exists (in which case we need + * to delete it */ + status = ocfs2_find_files_on_disk(new_dentry->d_name.name, + new_dentry->d_name.len, + &newfe_blkno, new_dir, &new_de_bh, + &new_de); + /* The only error we allow here is -ENOENT because the new + * file not existing is perfectly valid. */ + if ((status < 0) && (status != -ENOENT)) { + /* If we cannot find the file specified we should just */ + /* return the error... */ + mlog_errno(status); + goto bail; + } + + if (!new_de && new_inode) + mlog(ML_ERROR, "inode %lu does not exist in it's parent " + "directory!", new_inode->i_ino); + + /* In case we need to overwrite an existing file, we blow it + * away first */ + if (new_de) { + /* VFS didn't think there existed an inode here, but + * someone else in the cluster must have raced our + * rename to create one. Today we error cleanly, in + * the future we should consider calling iget to build + * a new struct inode for this entry. */ + if (!new_inode) { + status = -EACCES; + + mlog(0, "We found an inode for name %.*s but VFS " + "didn't give us one.\n", new_dentry->d_name.len, + new_dentry->d_name.name); + goto bail; + } + + if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) { + status = -EACCES; + + mlog(0, "Inode blkno (%"MLFu64") and dir (%"MLFu64") " + "disagree. ip_flags = %x\n", + OCFS2_I(new_inode)->ip_blkno, newfe_blkno, + OCFS2_I(new_inode)->ip_flags); + goto bail; + } + + status = ocfs2_meta_lock(new_inode, handle, &newfe_bh, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto bail; + } + + if (S_ISDIR(new_inode->i_mode)) + links_count = 0; + else + links_count = (unsigned int) (new_inode->i_nlink - 1); + + status = ocfs2_request_unlink_vote(new_inode, new_dentry, + links_count); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + newfe = (struct ocfs2_dinode *) newfe_bh->b_data; + + mlog(0, "aha rename over existing... new_de=%p " + "new_blkno=%"MLFu64" newfebh=%p bhblocknr=%llu\n", + new_de, newfe_blkno, newfe_bh, newfe_bh ? + (unsigned long long)newfe_bh->b_blocknr : 0ULL); + + if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) { + status = ocfs2_prepare_orphan_dir(osb, handle, + new_inode, + orphan_name, + &orphan_entry_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + } else { + BUG_ON(new_dentry->d_parent->d_inode != new_dir); + + status = ocfs2_check_dir_for_entry(new_dir, + new_dentry->d_name.name, + new_dentry->d_name.len); + if (status) + goto bail; + + status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh, + new_dentry->d_name.name, + new_dentry->d_name.len, + &insert_entry_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + handle = ocfs2_start_trans(osb, handle, OCFS2_RENAME_CREDITS); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto bail; + } + + if (new_de) { + if (S_ISDIR(new_inode->i_mode)) { + if (!ocfs2_empty_dir(new_inode) || + new_inode->i_nlink != 2) { + status = -ENOTEMPTY; + goto bail; + } + } + status = ocfs2_journal_access(handle, new_inode, newfe_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + if (S_ISDIR(new_inode->i_mode) || + (newfe->i_links_count == cpu_to_le16(1))){ + status = ocfs2_orphan_add(osb, handle, new_inode, + newfe, orphan_name, + orphan_entry_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + /* change the dirent to point to the correct inode */ + status = ocfs2_journal_access(handle, new_dir, new_de_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + new_de->inode = cpu_to_le64(OCFS2_I(old_inode)->ip_blkno); + new_de->file_type = old_de->file_type; + new_dir->i_version++; + status = ocfs2_journal_dirty(handle, new_de_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + if (S_ISDIR(new_inode->i_mode)) + newfe->i_links_count = 0; + else + le16_add_cpu(&newfe->i_links_count, -1); + + status = ocfs2_journal_dirty(handle, newfe_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } else { + /* if the name was not found in new_dir, add it now */ + status = ocfs2_add_entry(handle, new_dentry, old_inode, + OCFS2_I(old_inode)->ip_blkno, + new_dir_bh, insert_entry_bh); + } + + old_inode->i_ctime = CURRENT_TIME; + mark_inode_dirty(old_inode); + + /* now that the name has been added to new_dir, remove the old name */ + status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + if (new_inode) { + new_inode->i_nlink--; + new_inode->i_ctime = CURRENT_TIME; + } + old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME; + if (old_inode_de_bh) { + status = ocfs2_journal_access(handle, old_inode, + old_inode_de_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + PARENT_INO(old_inode_de_bh->b_data) = + cpu_to_le64(OCFS2_I(new_dir)->ip_blkno); + status = ocfs2_journal_dirty(handle, old_inode_de_bh); + old_dir->i_nlink--; + if (new_inode) { + new_inode->i_nlink--; + } else { + new_dir->i_nlink++; + mark_inode_dirty(new_dir); + } + } + mark_inode_dirty(old_dir); + if (new_inode) + mark_inode_dirty(new_inode); + + if (old_dir != new_dir) + if (new_dir_nlink != new_dir->i_nlink) { + if (!new_dir_bh) { + mlog(ML_ERROR, "need to change nlink for new " + "dir %"MLFu64" from %d to %d but bh is " + "NULL\n", OCFS2_I(new_dir)->ip_blkno, + (int)new_dir_nlink, new_dir->i_nlink); + } else { + struct ocfs2_dinode *fe; + status = ocfs2_journal_access(handle, + new_dir, + new_dir_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + fe = (struct ocfs2_dinode *) new_dir_bh->b_data; + fe->i_links_count = cpu_to_le16(new_dir->i_nlink); + status = ocfs2_journal_dirty(handle, new_dir_bh); + } + } + + if (old_dir_nlink != old_dir->i_nlink) { + if (!old_dir_bh) { + mlog(ML_ERROR, "need to change nlink for old dir " + "%"MLFu64" from %d to %d but bh is NULL!\n", + OCFS2_I(old_dir)->ip_blkno, + (int)old_dir_nlink, + old_dir->i_nlink); + } else { + struct ocfs2_dinode *fe; + status = ocfs2_journal_access(handle, old_dir, + old_dir_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + fe = (struct ocfs2_dinode *) old_dir_bh->b_data; + fe->i_links_count = cpu_to_le16(old_dir->i_nlink); + status = ocfs2_journal_dirty(handle, old_dir_bh); + } + } + + status = 0; +bail: + if (rename_lock) + ocfs2_rename_unlock(osb); + + if (handle) + ocfs2_commit_trans(handle); + + if (new_inode) + sync_mapping_buffers(old_inode->i_mapping); + + if (new_inode) + iput(new_inode); + if (newfe_bh) + brelse(newfe_bh); + if (old_dir_bh) + brelse(old_dir_bh); + if (new_dir_bh) + brelse(new_dir_bh); + if (new_de_bh) + brelse(new_de_bh); + if (old_de_bh) + brelse(old_de_bh); + if (old_inode_de_bh) + brelse(old_inode_de_bh); + if (orphan_entry_bh) + brelse(orphan_entry_bh); + if (insert_entry_bh) + brelse(insert_entry_bh); + + mlog_exit(status); + + return status; +} + +/* + * we expect i_size = strlen(symname). Copy symname into the file + * data, including the null terminator. + */ +static int ocfs2_create_symlink_data(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + const char *symname) +{ + struct buffer_head **bhs = NULL; + const char *c; + struct super_block *sb = osb->sb; + u64 p_blkno; + int p_blocks; + int virtual, blocks, status, i, bytes_left; + + bytes_left = i_size_read(inode) + 1; + /* we can't trust i_blocks because we're actually going to + * write i_size + 1 bytes. */ + blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits; + + mlog_entry("i_blocks = %lu, i_size = %llu, blocks = %d\n", + inode->i_blocks, i_size_read(inode), blocks); + + /* Sanity check -- make sure we're going to fit. */ + if (bytes_left > + ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) { + status = -EIO; + mlog_errno(status); + goto bail; + } + + bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL); + if (!bhs) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + status = ocfs2_extent_map_get_blocks(inode, 0, 1, &p_blkno, + &p_blocks); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + /* links can never be larger than one cluster so we know this + * is all going to be contiguous, but do a sanity check + * anyway. */ + if ((p_blocks << sb->s_blocksize_bits) < bytes_left) { + status = -EIO; + mlog_errno(status); + goto bail; + } + + virtual = 0; + while(bytes_left > 0) { + c = &symname[virtual * sb->s_blocksize]; + + bhs[virtual] = sb_getblk(sb, p_blkno); + if (!bhs[virtual]) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]); + + status = ocfs2_journal_access(handle, inode, bhs[virtual], + OCFS2_JOURNAL_ACCESS_CREATE); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + memset(bhs[virtual]->b_data, 0, sb->s_blocksize); + + memcpy(bhs[virtual]->b_data, c, + (bytes_left > sb->s_blocksize) ? sb->s_blocksize : + bytes_left); + + status = ocfs2_journal_dirty(handle, bhs[virtual]); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + virtual++; + p_blkno++; + bytes_left -= sb->s_blocksize; + } + + status = 0; +bail: + + if (bhs) { + for(i = 0; i < blocks; i++) + if (bhs[i]) + brelse(bhs[i]); + kfree(bhs); + } + + mlog_exit(status); + return status; +} + +static int ocfs2_symlink(struct inode *dir, + struct dentry *dentry, + const char *symname) +{ + int status, l, credits; + u64 newsize; + struct ocfs2_super *osb = NULL; + struct inode *inode = NULL; + struct super_block *sb; + struct buffer_head *new_fe_bh = NULL; + struct buffer_head *de_bh = NULL; + struct buffer_head *parent_fe_bh = NULL; + struct ocfs2_dinode *fe = NULL; + struct ocfs2_dinode *dirfe; + struct ocfs2_journal_handle *handle = NULL; + struct ocfs2_alloc_context *inode_ac = NULL; + struct ocfs2_alloc_context *data_ac = NULL; + + mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir, + dentry, symname, dentry->d_name.len, dentry->d_name.name); + + sb = dir->i_sb; + osb = OCFS2_SB(sb); + + l = strlen(symname) + 1; + + credits = ocfs2_calc_symlink_credits(sb); + + handle = ocfs2_alloc_handle(osb); + if (handle == NULL) { + status = -ENOMEM; + mlog_errno(status); + goto bail; + } + + /* lock the parent directory */ + status = ocfs2_meta_lock(dir, handle, &parent_fe_bh, 1); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + goto bail; + } + + dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data; + if (!dirfe->i_links_count) { + /* can't make a file in a deleted directory. */ + status = -ENOENT; + goto bail; + } + + status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name, + dentry->d_name.len); + if (status) + goto bail; + + status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh, + dentry->d_name.name, + dentry->d_name.len, &de_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + status = ocfs2_reserve_new_inode(osb, handle, &inode_ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + + /* don't reserve bitmap space for fast symlinks. */ + if (l > ocfs2_fast_symlink_chars(sb)) { + status = ocfs2_reserve_clusters(osb, handle, 1, &data_ac); + if (status < 0) { + if (status != -ENOSPC) + mlog_errno(status); + goto bail; + } + } + + handle = ocfs2_start_trans(osb, handle, credits); + if (IS_ERR(handle)) { + status = PTR_ERR(handle); + handle = NULL; + mlog_errno(status); + goto bail; + } + + status = ocfs2_mknod_locked(osb, dir, dentry, + S_IFLNK | S_IRWXUGO, 0, + &new_fe_bh, parent_fe_bh, handle, + &inode, inode_ac); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + fe = (struct ocfs2_dinode *) new_fe_bh->b_data; + inode->i_rdev = 0; + newsize = l - 1; + if (l > ocfs2_fast_symlink_chars(sb)) { + inode->i_op = &ocfs2_symlink_inode_operations; + status = ocfs2_do_extend_allocation(osb, inode, 1, new_fe_bh, + handle, data_ac, NULL, + NULL); + if (status < 0) { + if (status != -ENOSPC && status != -EINTR) { + mlog(ML_ERROR, "Failed to extend file to " + "%"MLFu64"\n", + newsize); + mlog_errno(status); + status = -ENOSPC; + } + goto bail; + } + i_size_write(inode, newsize); + inode->i_blocks = ocfs2_align_bytes_to_sectors(newsize); + } else { + inode->i_op = &ocfs2_fast_symlink_inode_operations; + memcpy((char *) fe->id2.i_symlink, symname, l); + i_size_write(inode, newsize); + inode->i_blocks = 0; + } + + status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + if (!ocfs2_inode_is_fast_symlink(inode)) { + status = ocfs2_create_symlink_data(osb, handle, inode, + symname); + if (status < 0) { + mlog_errno(status); + goto bail; + } + } + + status = ocfs2_add_entry(handle, dentry, inode, + le64_to_cpu(fe->i_blkno), parent_fe_bh, + de_bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + + insert_inode_hash(inode); + dentry->d_op = &ocfs2_dentry_ops; + d_instantiate(dentry, inode); +bail: + if (handle) + ocfs2_commit_trans(handle); + if (new_fe_bh) + brelse(new_fe_bh); + if (parent_fe_bh) + brelse(parent_fe_bh); + if (de_bh) + brelse(de_bh); + if (inode_ac) + ocfs2_free_alloc_context(inode_ac); + if (data_ac) + ocfs2_free_alloc_context(data_ac); + if ((status < 0) && inode) + iput(inode); + + mlog_exit(status); + + return status; +} + +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 #%"MLFu64": %s - " + "offset=%lu, inode=%"MLFu64", rec_len=%d, name_len=%d\n", + OCFS2_I(dir)->ip_blkno, error_msg, offset, + le64_to_cpu(de->inode), rlen, de->name_len); + return error_msg == NULL ? 1 : 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. + */ +static int __ocfs2_add_entry(struct ocfs2_journal_handle *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 super_block *sb; + int retval, status; + + mlog_entry_void(); + + sb = dir->i_sb; + + if (!namelen) + return -EINVAL; + + rec_len = OCFS2_DIR_REC_LEN(namelen); + offset = 0; + de = (struct ocfs2_dir_entry *) insert_bh->b_data; + while (1) { + BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data); + /* 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 (((le64_to_cpu(de->inode) == 0) && + (le16_to_cpu(de->rec_len) >= rec_len)) || + (le16_to_cpu(de->rec_len) >= + (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) { + 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_mtime = dir->i_ctime = CURRENT_TIME; + 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; +} + + +/* + * ocfs2_delete_entry deletes a directory entry by merging it with the + * previous entry + */ +static int ocfs2_delete_entry(struct ocfs2_journal_handle *handle, + struct inode *dir, + struct ocfs2_dir_entry *de_del, + struct buffer_head *bh) +{ + 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 *) bh->b_data; + while (i < bh->b_size) { + 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) + pde->rec_len = + cpu_to_le16(le16_to_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; +} + +/* + * 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, + 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 = bh->b_data; + dlimit = de_buf + dir->i_sb->s_blocksize; + + 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; +} + +struct buffer_head *ocfs2_find_entry(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(); + + *res_dir = NULL; + 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++; + + /* XXX: questionable readahead stuff here */ + bh = ocfs2_bread(dir, b++, &err, 1); + bh_use[ra_max] = bh; +#if 0 // ??? + if (bh) + ll_rw_block(READ, 1, &bh); +#endif + } + } + if ((bh = bh_use[ra_ptr++]) == NULL) + goto next; + wait_on_buffer(bh); + if (!buffer_uptodate(bh)) { + /* read error, skip block & hope for the best */ + brelse(bh); + goto next; + } + i = ocfs2_search_dirblock(bh, dir, name, namelen, + block << sb->s_blocksize_bits, + 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; +} + +static int ocfs2_blkno_stringify(u64 blkno, char *name) +{ + int status, namelen; + + mlog_entry_void(); + + namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016"MLFx64, + blkno); + if (namelen <= 0) { + if (namelen) + status = namelen; + else + status = -EINVAL; + mlog_errno(status); + goto bail; + } + if (namelen != OCFS2_ORPHAN_NAMELEN) { + status = -EINVAL; + mlog_errno(status); + goto bail; + } + + mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name, + namelen); + + status = 0; +bail: + mlog_exit(status); + return status; +} + +static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + char *name, + struct buffer_head **de_bh) +{ + struct inode *orphan_dir_inode = NULL; + struct buffer_head *orphan_dir_bh = NULL; + int status = 0; + + status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + orphan_dir_inode = ocfs2_get_system_file_inode(osb, + ORPHAN_DIR_SYSTEM_INODE, + osb->slot_num); + if (!orphan_dir_inode) { + status = -ENOENT; + mlog_errno(status); + goto leave; + } + + ocfs2_handle_add_inode(handle, orphan_dir_inode); + status = ocfs2_meta_lock(orphan_dir_inode, handle, &orphan_dir_bh, 1); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode, + orphan_dir_bh, name, + OCFS2_ORPHAN_NAMELEN, de_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + +leave: + if (orphan_dir_inode) + iput(orphan_dir_inode); + + if (orphan_dir_bh) + brelse(orphan_dir_bh); + + mlog_exit(status); + return status; +} + +static int ocfs2_orphan_add(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *inode, + struct ocfs2_dinode *fe, + char *name, + struct buffer_head *de_bh) +{ + struct inode *orphan_dir_inode = NULL; + struct buffer_head *orphan_dir_bh = NULL; + int status = 0; + struct ocfs2_dinode *orphan_fe; + + mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino); + + orphan_dir_inode = ocfs2_get_system_file_inode(osb, + ORPHAN_DIR_SYSTEM_INODE, + osb->slot_num); + if (!orphan_dir_inode) { + status = -ENOENT; + mlog_errno(status); + goto leave; + } + + status = ocfs2_read_block(osb, + OCFS2_I(orphan_dir_inode)->ip_blkno, + &orphan_dir_bh, OCFS2_BH_CACHED, + orphan_dir_inode); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + /* we're a cluster, and nlink can change on disk from + * underneath us... */ + orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data; + if (S_ISDIR(inode->i_mode)) + le16_add_cpu(&orphan_fe->i_links_count, 1); + orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count); + + status = ocfs2_journal_dirty(handle, orphan_dir_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = __ocfs2_add_entry(handle, orphan_dir_inode, name, + OCFS2_ORPHAN_NAMELEN, inode, + OCFS2_I(inode)->ip_blkno, + orphan_dir_bh, de_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL); + + /* Record which orphan dir our inode now resides + * in. delete_inode will use this to determine which orphan + * dir to lock. */ + spin_lock(&OCFS2_I(inode)->ip_lock); + OCFS2_I(inode)->ip_orphaned_slot = osb->slot_num; + spin_unlock(&OCFS2_I(inode)->ip_lock); + + mlog(0, "Inode %"MLFu64" orphaned in slot %d\n", + OCFS2_I(inode)->ip_blkno, osb->slot_num); + +leave: + if (orphan_dir_inode) + iput(orphan_dir_inode); + + if (orphan_dir_bh) + brelse(orphan_dir_bh); + + mlog_exit(status); + return status; +} + +/* unlike orphan_add, we expect the orphan dir to already be locked here. */ +int ocfs2_orphan_del(struct ocfs2_super *osb, + struct ocfs2_journal_handle *handle, + struct inode *orphan_dir_inode, + struct inode *inode, + struct buffer_head *orphan_dir_bh) +{ + char name[OCFS2_ORPHAN_NAMELEN + 1]; + struct ocfs2_dinode *orphan_fe; + int status = 0; + struct buffer_head *target_de_bh = NULL; + struct ocfs2_dir_entry *target_de = NULL; + + mlog_entry_void(); + + status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + mlog(0, "removing '%s' from orphan dir %"MLFu64" (namelen=%d)\n", + name, OCFS2_I(orphan_dir_inode)->ip_blkno, OCFS2_ORPHAN_NAMELEN); + + /* find it's spot in the orphan directory */ + target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN, + orphan_dir_inode, &target_de); + if (!target_de_bh) { + status = -ENOENT; + mlog_errno(status); + goto leave; + } + + /* remove it from the orphan directory */ + status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de, + target_de_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + status = ocfs2_journal_access(handle,orphan_dir_inode, orphan_dir_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (status < 0) { + mlog_errno(status); + goto leave; + } + + /* do the i_nlink dance! :) */ + orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data; + if (S_ISDIR(inode->i_mode)) + le16_add_cpu(&orphan_fe->i_links_count, -1); + orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count); + + status = ocfs2_journal_dirty(handle, orphan_dir_bh); + if (status < 0) { + mlog_errno(status); + goto leave; + } + +leave: + if (target_de_bh) + brelse(target_de_bh); + + mlog_exit(status); + return status; +} + +struct inode_operations ocfs2_dir_iops = { + .create = ocfs2_create, + .lookup = ocfs2_lookup, + .link = ocfs2_link, + .unlink = ocfs2_unlink, + .rmdir = ocfs2_unlink, + .symlink = ocfs2_symlink, + .mkdir = ocfs2_mkdir, + .mknod = ocfs2_mknod, + .rename = ocfs2_rename, + .setattr = ocfs2_setattr, + .getattr = ocfs2_getattr, +}; 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