staticvoid ocfs2_double_unlock(struct inode *inode1, struct inode *inode2); /* An orphan dir name is an 8 byte value, printed as a hex string */ #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
ret = ERR_PTR(-ENAMETOOLONG); goto bail;
}
status = ocfs2_inode_lock_nested(dir, NULL, 0, OI_LS_PARENT); if (status < 0) { if (status != -ENOENT)
mlog_errno(status);
ret = ERR_PTR(status); goto bail;
}
status = ocfs2_lookup_ino_from_name(dir, dentry->d_name.name,
dentry->d_name.len, &blkno); if (status < 0) goto bail_add;
inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0); if (IS_ERR(inode)) {
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;
spin_unlock(&oi->ip_lock);
bail_add:
ret = d_splice_alias(inode, dentry); if (IS_ERR(ret)) goto bail_unlock;
if (inode) { /* * If d_splice_alias() finds a DCACHE_DISCONNECTED * dentry, it will d_move() it on top of ourse. The * return value will indicate this however, so in * those cases, we switch them around for the locking * code. * * NOTE: This dentry already has ->d_op set from * ocfs2_get_parent() and ocfs2_get_dentry()
*/ if (ret)
dentry = ret;
status = ocfs2_dentry_attach_lock(dentry, inode,
OCFS2_I(dir)->ip_blkno); if (status) {
mlog_errno(status); if (ret)
dput(ret);
ret = ERR_PTR(status);
}
} else
ocfs2_dentry_attach_gen(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 downconvert thread and have a stale dentry. */
ocfs2_inode_unlock(dir, 0);
/* populate as many fields early on as possible - many of * these are used by the support functions here and in
* callers. */ if (S_ISDIR(mode))
set_nlink(inode, 2);
mode = mode_strip_sgid(&nop_mnt_idmap, dir, mode);
inode_init_owner(&nop_mnt_idmap, inode, dir, mode);
status = dquot_initialize(inode); if (status) {
iput(inode); return ERR_PTR(status);
}
status = dquot_initialize(dir); if (status) {
mlog_errno(status); return status;
}
/* get our super block */
osb = OCFS2_SB(dir->i_sb);
status = ocfs2_inode_lock(dir, &parent_fe_bh, 1); if (status < 0) { if (status != -ENOENT)
mlog_errno(status); return status;
}
if (S_ISDIR(mode) && (dir->i_nlink >= ocfs2_link_max(osb))) {
status = -EMLINK; goto leave;
}
dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data; if (!ocfs2_read_links_count(dirfe)) { /* 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, &lookup); if (status < 0) {
mlog_errno(status); goto leave;
}
/* reserve an inode spot */
status = ocfs2_reserve_new_inode(osb, &inode_ac); if (status < 0) { if (status != -ENOSPC)
mlog_errno(status); goto leave;
}
inode = ocfs2_get_init_inode(dir, mode); if (IS_ERR(inode)) {
status = PTR_ERR(inode);
inode = NULL;
mlog_errno(status); goto leave;
}
/* get security xattr */
status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si); if (status) { if (status == -EOPNOTSUPP)
si.enable = 0; else {
mlog_errno(status); goto leave;
}
}
/* calculate meta data/clusters for setting security and acl xattr */
status = ocfs2_calc_xattr_init(dir, parent_fe_bh, mode,
&si, &want_clusters,
&xattr_credits, &want_meta); if (status < 0) {
mlog_errno(status); goto leave;
}
/* Reserve a cluster if creating an extent based directory. */ if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
want_clusters += 1;
/* Dir indexing requires extra space as well */ if (ocfs2_supports_indexed_dirs(osb))
want_meta++;
}
status = ocfs2_reserve_new_metadata_blocks(osb, want_meta, &meta_ac); if (status < 0) { if (status != -ENOSPC)
mlog_errno(status); goto leave;
}
status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac); if (status < 0) { if (status != -ENOSPC)
mlog_errno(status); goto leave;
}
handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb,
S_ISDIR(mode),
xattr_credits)); if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status); goto leave;
}
/* Starting to change things, restart is no longer possible. */
ocfs2_block_signals(&oldset);
did_block_signals = 1;
status = dquot_alloc_inode(inode); if (status) goto leave;
did_quota_inode = 1;
/* do the real work now. */
status = ocfs2_mknod_locked(osb, dir, inode, dev,
&new_fe_bh, parent_fe_bh, handle,
inode_ac); if (status < 0) {
mlog_errno(status); goto leave;
}
fe = (struct ocfs2_dinode *) new_fe_bh->b_data; if (S_ISDIR(mode)) {
status = ocfs2_fill_new_dir(osb, handle, dir, inode,
new_fe_bh, data_ac, meta_ac); if (status < 0) {
mlog_errno(status); goto leave;
}
status = ocfs2_init_acl(handle, inode, dir, new_fe_bh, parent_fe_bh,
meta_ac, data_ac);
if (status < 0) {
mlog_errno(status); goto roll_back;
}
if (si.enable) {
status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
meta_ac, data_ac); if (status < 0) {
mlog_errno(status); goto roll_back;
}
}
/* * Do this before adding the entry to the directory. We add * also set d_op after success so that ->d_iput() will cleanup * the dentry lock even if ocfs2_add_entry() fails below.
*/
status = ocfs2_dentry_attach_lock(dentry, inode,
OCFS2_I(dir)->ip_blkno); if (status) {
mlog_errno(status); goto roll_back;
}
dl = dentry->d_fsdata;
status = ocfs2_add_entry(handle, dentry, inode,
OCFS2_I(inode)->ip_blkno, parent_fe_bh,
&lookup); if (status < 0) {
mlog_errno(status); goto roll_back;
}
insert_inode_hash(inode);
d_instantiate(dentry, inode);
status = 0;
/* * We should call iput after the i_rwsem of the bitmap been * unlocked in ocfs2_free_alloc_context, or the * ocfs2_delete_inode will mutex_lock again.
*/ if ((status < 0) && inode) { if (dl)
ocfs2_cleanup_add_entry_failure(osb, dentry, inode);
/* 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);
oi->ip_blkno = fe_blkno;
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 = -ENOMEM;
mlog_errno(status); goto leave;
}
ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), *new_fe_bh);
status = ocfs2_journal_access_di(handle, INODE_CACHE(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);
/* * If supported, directories start with inline data. If inline * isn't supported, but indexing is, we start them as indexed.
*/
feat = le16_to_cpu(fe->i_dyn_features); if (S_ISDIR(inode->i_mode) && ocfs2_supports_inline_data(osb)) {
fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
/* make sure both dirs have bhs
* get an extra ref on old_dir_bh if old==new */ if (!parent_fe_bh) { if (old_dir_bh) {
parent_fe_bh = old_dir_bh;
get_bh(parent_fe_bh);
} else {
mlog(ML_ERROR, "%s: no old_dir_bh!\n", osb->uuid_str);
err = -EIO; goto out;
}
}
/* * Check whether another node removed the source inode while we * were in the vfs.
*/ if (old_de_ino != OCFS2_I(inode)->ip_blkno) {
err = -ENOENT; goto out;
}
err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
dentry->d_name.len); if (err) goto out;
/* * Takes and drops an exclusive lock on the given dentry. This will * force other nodes to drop it.
*/ staticint ocfs2_remote_dentry_delete(struct dentry *dentry)
{ int ret;
ret = ocfs2_dentry_lock(dentry, 1); if (ret)
mlog_errno(ret); else
ocfs2_dentry_unlock(dentry, 1);
return ret;
}
staticinlineint ocfs2_inode_is_unlinkable(struct inode *inode)
{ if (S_ISDIR(inode->i_mode)) { if (inode->i_nlink == 2) return 1; return 0;
}
status = ocfs2_inode_lock(inode, &fe_bh, 1); if (status < 0) { if (status != -ENOENT)
mlog_errno(status); goto leave;
}
child_locked = 1;
if (S_ISDIR(inode->i_mode)) { if (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) {
status = -ENOTEMPTY; goto leave;
}
}
status = ocfs2_remote_dentry_delete(dentry); if (status < 0) { /* This remote delete should succeed under all normal
* circumstances. */
mlog_errno(status); goto leave;
}
if (ocfs2_inode_is_unlinkable(inode)) {
status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
OCFS2_I(inode)->ip_blkno,
orphan_name, &orphan_insert, false); if (status < 0) {
mlog_errno(status); goto leave;
}
is_unlinkable = true;
}
handle = ocfs2_start_trans(osb, ocfs2_unlink_credits(osb->sb)); if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status); goto leave;
}
status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
OCFS2_JOURNAL_ACCESS_WRITE); if (status < 0) {
mlog_errno(status); goto leave;
}
fe = (struct ocfs2_dinode *) fe_bh->b_data;
/* delete the name from the parent dir */
status = ocfs2_delete_entry(handle, dir, &lookup); if (status < 0) {
mlog_errno(status); goto leave;
}
inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); if (S_ISDIR(inode->i_mode))
drop_nlink(dir);
status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh); if (status < 0) {
mlog_errno(status); if (S_ISDIR(inode->i_mode))
inc_nlink(dir); goto leave;
}
if (is_unlinkable) {
status = ocfs2_orphan_add(osb, handle, inode, fe_bh,
orphan_name, &orphan_insert, orphan_dir, false); if (status < 0)
mlog_errno(status);
}
leave: if (handle)
ocfs2_commit_trans(osb, handle);
if (orphan_dir) { /* This was locked for us in ocfs2_prepare_orphan_dir() */
ocfs2_inode_unlock(orphan_dir, 1);
inode_unlock(orphan_dir);
iput(orphan_dir);
}
staticint ocfs2_check_if_ancestor(struct ocfs2_super *osb,
u64 src_inode_no, u64 dest_inode_no)
{ int ret = 0, i = 0;
u64 parent_inode_no = 0;
u64 child_inode_no = src_inode_no; struct inode *child_inode;
#define MAX_LOOKUP_TIMES 32 while (1) {
child_inode = ocfs2_iget(osb, child_inode_no, 0, 0); if (IS_ERR(child_inode)) {
ret = PTR_ERR(child_inode); break;
}
ret = ocfs2_inode_lock(child_inode, NULL, 0); if (ret < 0) {
iput(child_inode); if (ret != -ENOENT)
mlog_errno(ret); break;
}
ret = ocfs2_lookup_ino_from_name(child_inode, "..", 2,
&parent_inode_no);
ocfs2_inode_unlock(child_inode, 0);
iput(child_inode); if (ret < 0) {
ret = -ENOENT; break;
}
if (parent_inode_no == dest_inode_no) {
ret = 1; break;
}
if (parent_inode_no == osb->root_inode->i_ino) {
ret = 0; break;
}
child_inode_no = parent_inode_no;
if (++i >= MAX_LOOKUP_TIMES) {
mlog_ratelimited(ML_NOTICE, "max lookup times reached, " "filesystem may have nested directories, " "src inode: %llu, dest inode: %llu.\n",
(unsignedlonglong)src_inode_no,
(unsignedlonglong)dest_inode_no);
ret = 0; break;
}
}
return ret;
}
/* * The only place this should be used is rename and link! * if they have the same id, then the 1st one is the only one locked.
*/ staticint ocfs2_double_lock(struct ocfs2_super *osb, struct buffer_head **bh1, struct inode *inode1, struct buffer_head **bh2, struct inode *inode2, int rename)
{ int status; int inode1_is_ancestor, inode2_is_ancestor; struct ocfs2_inode_info *oi1 = OCFS2_I(inode1); struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
/* we always want to lock the one with the lower lockid first.
* and if they are nested, we lock ancestor first */ if (oi1->ip_blkno != oi2->ip_blkno) {
inode1_is_ancestor = ocfs2_check_if_ancestor(osb, oi2->ip_blkno,
oi1->ip_blkno); if (inode1_is_ancestor < 0) {
status = inode1_is_ancestor; goto bail;
}
inode2_is_ancestor = ocfs2_check_if_ancestor(osb, oi1->ip_blkno,
oi2->ip_blkno); if (inode2_is_ancestor < 0) {
status = inode2_is_ancestor; goto bail;
}
if ((inode1_is_ancestor == 1) ||
(oi1->ip_blkno < oi2->ip_blkno &&
inode2_is_ancestor == 0)) { /* switch id1 and id2 around */
swap(bh2, bh1);
swap(inode2, inode1);
} /* lock id2 */
status = ocfs2_inode_lock_nested(inode2, bh2, 1,
rename == 1 ? OI_LS_RENAME1 : OI_LS_PARENT); if (status < 0) { if (status != -ENOENT)
mlog_errno(status); goto bail;
}
}
/* lock id1 */
status = ocfs2_inode_lock_nested(inode1, bh1, 1,
rename == 1 ? OI_LS_RENAME2 : OI_LS_PARENT); if (status < 0) { /* * An error return must mean that no cluster locks * were held on function exit.
*/ if (oi1->ip_blkno != oi2->ip_blkno) {
ocfs2_inode_unlock(inode2, 1);
brelse(*bh2);
*bh2 = NULL;
}
status = dquot_initialize(old_dir); if (status) {
mlog_errno(status); goto bail;
}
status = dquot_initialize(new_dir); if (status) {
mlog_errno(status); goto bail;
}
osb = OCFS2_SB(old_dir->i_sb);
if (new_inode) { if (!igrab(new_inode))
BUG();
}
/* Assume a directory hierarchy 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_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
status = ocfs2_rename_lock(osb); if (status < 0) {
mlog_errno(status); goto bail;
}
rename_lock = 1;
/* here we cannot guarantee the inodes haven't just been
* changed, so check if they are nested again */
status = ocfs2_check_if_ancestor(osb, new_dir->i_ino,
old_inode->i_ino); if (status < 0) {
mlog_errno(status); goto bail;
} elseif (status == 1) {
status = -EPERM;
trace_ocfs2_rename_not_permitted(
(unsignedlonglong)old_inode->i_ino,
(unsignedlonglong)new_dir->i_ino); goto bail;
}
}
/* if old and new are the same, this'll just do one lock. */
status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
&new_dir_bh, new_dir, 1); if (status < 0) {
mlog_errno(status); goto bail;
}
parents_locked = 1;
if (!new_dir->i_nlink) {
status = -EACCES; 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;
}
}
/* * Aside from allowing a meta data update, the locking here * also ensures that the downconvert thread on other nodes * won't have to concurrently downconvert the inode and the * dentry locks.
*/
status = ocfs2_inode_lock_nested(old_inode, &old_inode_bh, 1,
OI_LS_PARENT); if (status < 0) { if (status != -ENOENT)
mlog_errno(status); goto bail;
}
old_child_locked = 1;
status = ocfs2_remote_dentry_delete(old_dentry); if (status < 0) {
mlog_errno(status); goto bail;
}
if (S_ISDIR(old_inode->i_mode) && new_dir != old_dir) {
u64 old_inode_parent;
update_dot_dot = 1;
status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
old_inode,
&old_inode_dot_dot_res); if (status) {
status = -EIO; goto bail;
}
if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
status = -EIO; goto bail;
}
if (!new_inode && new_dir->i_nlink >= ocfs2_link_max(osb)) {
status = -EMLINK; goto bail;
}
}
status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
old_dentry->d_name.len,
&old_de_ino); if (status) {
status = -ENOENT; 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 (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
status = -ENOENT; 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,
&target_lookup_res); /* 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 (status == 0)
target_exists = 1;
if (!target_exists && new_inode) { /* * Target was unlinked by another node while we were * waiting to get to ocfs2_rename(). There isn't * anything we can do here to help the situation, so * bubble up the appropriate error.
*/
status = -ENOENT; goto bail;
}
/* In case we need to overwrite an existing file, we blow it
* away first */ if (target_exists) { /* 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;
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,
&target_insert); if (status < 0) {
mlog_errno(status); goto bail;
}
}
handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb)); if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status); goto bail;
}
if (target_exists) { if (S_ISDIR(new_inode->i_mode)) { if (new_inode->i_nlink != 2 ||
!ocfs2_empty_dir(new_inode)) {
status = -ENOTEMPTY; goto bail;
}
}
status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode),
newfe_bh,
OCFS2_JOURNAL_ACCESS_WRITE); if (status < 0) {
mlog_errno(status); goto bail;
}
/* change the dirent to point to the correct inode */
status = ocfs2_update_entry(new_dir, handle, &target_lookup_res,
old_inode); if (status < 0) {
mlog_errno(status); goto bail;
}
inode_inc_iversion(new_dir);
if (S_ISDIR(new_inode->i_mode))
ocfs2_set_links_count(newfe, 0); else
ocfs2_add_links_count(newfe, -1);
ocfs2_journal_dirty(handle, newfe_bh); if (should_add_orphan) {
status = ocfs2_orphan_add(osb, handle, new_inode,
newfe_bh, orphan_name,
&orphan_insert, orphan_dir, false); 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, &target_insert); if (status < 0) {
mlog_errno(status); goto bail;
}
}
/* * Now that the name has been added to new_dir, remove the old name. * * We don't keep any directory entry context around until now * because the insert might have changed the type of directory * we're dealing with.
*/
status = ocfs2_find_entry(old_dentry->d_name.name,
old_dentry->d_name.len, old_dir,
&old_entry_lookup); if (status) { if (!is_journal_aborted(osb->journal->j_journal)) {
ocfs2_error(osb->sb, "new entry %.*s is added, but old entry %.*s " "is not deleted.",
new_dentry->d_name.len, new_dentry->d_name.name,
old_dentry->d_name.len, old_dentry->d_name.name);
} goto bail;
}
status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup); if (status < 0) {
mlog_errno(status); if (!is_journal_aborted(osb->journal->j_journal)) {
ocfs2_error(osb->sb, "new entry %.*s is added, but old entry %.*s " "is not deleted.",
new_dentry->d_name.len, new_dentry->d_name.name,
old_dentry->d_name.len, old_dentry->d_name.name);
} goto bail;
}
if (new_inode) {
drop_nlink(new_inode);
inode_set_ctime_current(new_inode);
}
inode_set_mtime_to_ts(old_dir, inode_set_ctime_current(old_dir));
if (update_dot_dot) {
status = ocfs2_update_entry(old_inode, handle,
&old_inode_dot_dot_res, new_dir); if (status < 0) {
mlog_errno(status); goto bail;
}
}
if (S_ISDIR(old_inode->i_mode)) {
drop_nlink(old_dir); if (new_inode) {
drop_nlink(new_inode);
} else {
inc_nlink(new_dir);
mark_inode_dirty(new_dir);
}
}
mark_inode_dirty(old_dir);
ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh); if (new_inode) {
mark_inode_dirty(new_inode);
ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
}
if (old_dir != new_dir) { /* Keep the same times on both directories.*/
inode_set_mtime_to_ts(new_dir,
inode_set_ctime_to_ts(new_dir, inode_get_ctime(old_dir)));
/* * This will also pick up the i_nlink change from the * block above.
*/
ocfs2_mark_inode_dirty(handle, new_dir, 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 " "%llu from %d to %d but bh is NULL!\n",
(unsignedlonglong)OCFS2_I(old_dir)->ip_blkno,
(int)old_dir_nlink, old_dir->i_nlink);
} else { struct ocfs2_dinode *fe;
status = ocfs2_journal_access_di(handle,
INODE_CACHE(old_dir),
old_dir_bh,
OCFS2_JOURNAL_ACCESS_WRITE); if (status < 0) {
mlog_errno(status); goto bail;
}
fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
ocfs2_set_links_count(fe, old_dir->i_nlink);
ocfs2_journal_dirty(handle, old_dir_bh);
}
}
ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
status = 0;
bail: if (handle)
ocfs2_commit_trans(osb, handle);
if (orphan_dir) { /* This was locked for us in ocfs2_prepare_orphan_dir() */
ocfs2_inode_unlock(orphan_dir, 1);
inode_unlock(orphan_dir);
iput(orphan_dir);
}
if (new_child_locked)
ocfs2_inode_unlock(new_inode, 1);
if (old_child_locked)
ocfs2_inode_unlock(old_inode, 1);
if (parents_locked)
ocfs2_double_unlock(old_dir, new_dir);
if (rename_lock)
ocfs2_rename_unlock(osb);
if (new_inode)
sync_mapping_buffers(old_inode->i_mapping);
/* 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, &p_blkno, &p_blocks,
NULL); 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;
}
status = dquot_initialize(dir); if (status) {
mlog_errno(status); goto bail;
}
sb = dir->i_sb;
osb = OCFS2_SB(sb);
l = strlen(symname) + 1;
credits = ocfs2_calc_symlink_credits(sb);
/* lock the parent directory */
status = ocfs2_inode_lock(dir, &parent_fe_bh, 1); if (status < 0) { if (status != -ENOENT)
mlog_errno(status); return status;
}
dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data; if (!ocfs2_read_links_count(dirfe)) { /* 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, &lookup); if (status < 0) {
mlog_errno(status); goto bail;
}
status = ocfs2_reserve_new_inode(osb, &inode_ac); if (status < 0) { if (status != -ENOSPC)
mlog_errno(status); goto bail;
}
inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO); if (IS_ERR(inode)) {
status = PTR_ERR(inode);
inode = NULL;
mlog_errno(status); goto bail;
}
/* get security xattr */
status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si); if (status) { if (status == -EOPNOTSUPP)
si.enable = 0; else {
mlog_errno(status); goto bail;
}
}
/* calculate meta data/clusters for setting security xattr */ if (si.enable) {
status = ocfs2_calc_security_init(dir, &si, &want_clusters,
&xattr_credits, &xattr_ac); if (status < 0) {
mlog_errno(status); goto bail;
}
}
/* don't reserve bitmap space for fast symlinks. */ if (l > ocfs2_fast_symlink_chars(sb))
want_clusters += 1;
status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac); if (status < 0) { if (status != -ENOSPC)
mlog_errno(status); goto bail;
}
handle = ocfs2_start_trans(osb, credits + xattr_credits); if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status); goto bail;
}
/* Starting to change things, restart is no longer possible. */
ocfs2_block_signals(&oldset);
did_block_signals = 1;
status = dquot_alloc_inode(inode); if (status) goto bail;
did_quota_inode = 1;
status = ocfs2_mknod_locked(osb, dir, inode,
0, &new_fe_bh, parent_fe_bh, handle,
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;
inode->i_op = &ocfs2_symlink_inode_operations;
inode_nohighmem(inode); if (l > ocfs2_fast_symlink_chars(sb)) {
u32 offset = 0;
status = dquot_alloc_space_nodirty(inode,
ocfs2_clusters_to_bytes(osb->sb, 1)); if (status) goto bail;
did_quota = 1;
inode->i_mapping->a_ops = &ocfs2_aops;
status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
new_fe_bh,
handle, data_ac, NULL,
NULL); if (status < 0) { if (status != -ENOSPC && status != -EINTR) {
mlog(ML_ERROR, "Failed to extend file to %llu\n",
(unsignedlonglong)newsize);
mlog_errno(status);
status = -ENOSPC;
} goto bail;
}
i_size_write(inode, newsize);
inode->i_blocks = ocfs2_inode_sector_count(inode);
} else {
inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
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;
}
}
if (si.enable) {
status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
xattr_ac, data_ac); if (status < 0) {
mlog_errno(status); goto bail;
}
}
/* * Do this before adding the entry to the directory. We add * also set d_op after success so that ->d_iput() will cleanup * the dentry lock even if ocfs2_add_entry() fails below.
*/
status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno); if (status) {
mlog_errno(status); goto bail;
}
dl = dentry->d_fsdata;
status = ocfs2_add_entry(handle, dentry, inode,
le64_to_cpu(fe->i_blkno), parent_fe_bh,
&lookup); if (status < 0) {
mlog_errno(status); goto bail;
}
insert_inode_hash(inode);
d_instantiate(dentry, inode);
bail: if (status < 0 && did_quota)
dquot_free_space_nodirty(inode,
ocfs2_clusters_to_bytes(osb->sb, 1)); if (status < 0 && did_quota_inode)
dquot_free_inode(inode); if (handle) { if (status < 0 && fe)
ocfs2_set_links_count(fe, 0);
ocfs2_commit_trans(osb, handle);
}
ocfs2_inode_unlock(dir, 1); if (did_block_signals)
ocfs2_unblock_signals(&oldset);
brelse(new_fe_bh);
brelse(parent_fe_bh);
kfree(si.value);
ocfs2_free_dir_lookup_result(&lookup); if (inode_ac)
ocfs2_free_alloc_context(inode_ac); if (data_ac)
ocfs2_free_alloc_context(data_ac); if (xattr_ac)
ocfs2_free_alloc_context(xattr_ac); if ((status < 0) && inode) { if (dl)
ocfs2_cleanup_add_entry_failure(osb, dentry, inode);
if (dio) {
ret = snprintf(name, OCFS2_DIO_ORPHAN_PREFIX_LEN + 1, "%s",
OCFS2_DIO_ORPHAN_PREFIX); if (ret != OCFS2_DIO_ORPHAN_PREFIX_LEN) {
ret = -EINVAL;
mlog_errno(ret); return ret;
}
ret = ocfs2_blkno_stringify(blkno,
name + OCFS2_DIO_ORPHAN_PREFIX_LEN);
} else
ret = ocfs2_blkno_stringify(blkno, name); if (ret < 0) {
mlog_errno(ret); return ret;
}
ret = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
orphan_dir_bh, name,
namelen, lookup); if (ret < 0) {
mlog_errno(ret); return ret;
}
return 0;
}
/** * ocfs2_prepare_orphan_dir() - Prepare an orphan directory for * insertion of an orphan. * @osb: ocfs2 file system * @ret_orphan_dir: Orphan dir inode - returned locked! * @blkno: Actual block number of the inode to be inserted into orphan dir. * @name: Buffer to store the name of the orphan. * @lookup: dir lookup result, to be passed back into functions like * ocfs2_orphan_add * @dio: Flag indicating if direct IO is being used or not. * * Returns zero on success and the ret_orphan_dir, name and lookup * fields will be populated. * * Returns non-zero on failure.
*/ staticint ocfs2_prepare_orphan_dir(struct ocfs2_super *osb, struct inode **ret_orphan_dir,
u64 blkno, char *name, struct ocfs2_dir_lookup_result *lookup, bool dio)
{ struct inode *orphan_dir_inode = NULL; struct buffer_head *orphan_dir_bh = NULL; int ret = 0;
ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir_inode,
&orphan_dir_bh); if (ret < 0) {
mlog_errno(ret); return ret;
}
ret = __ocfs2_prepare_orphan_dir(orphan_dir_inode, orphan_dir_bh,
blkno, name, lookup, dio); if (ret < 0) {
mlog_errno(ret); goto out;
}
*ret_orphan_dir = orphan_dir_inode;
out:
brelse(orphan_dir_bh);
if (ret) {
ocfs2_inode_unlock(orphan_dir_inode, 1);
inode_unlock(orphan_dir_inode);
iput(orphan_dir_inode);
}
status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh); if (status < 0) {
mlog_errno(status); goto leave;
}
status = ocfs2_journal_access_di(handle,
INODE_CACHE(orphan_dir_inode),
orphan_dir_bh,
OCFS2_JOURNAL_ACCESS_WRITE); if (status < 0) {
mlog_errno(status); goto leave;
}
/* * We're going to journal the change of i_flags and i_orphaned_slot. * It's safe anyway, though some callers may duplicate the journaling. * Journaling within the func just make the logic look more * straightforward.
*/
status = ocfs2_journal_access_di(handle,
INODE_CACHE(inode),
fe_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))
ocfs2_add_links_count(orphan_fe, 1);
set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
ocfs2_journal_dirty(handle, orphan_dir_bh);
status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
namelen, inode,
OCFS2_I(inode)->ip_blkno,
orphan_dir_bh, lookup); if (status < 0) {
mlog_errno(status); goto rollback;
}
if (dio) { /* Update flag OCFS2_DIO_ORPHANED_FL and record the orphan * slot.
*/
fe->i_flags |= cpu_to_le32(OCFS2_DIO_ORPHANED_FL);
fe->i_dio_orphaned_slot = cpu_to_le16(osb->slot_num);
} else {
fe->i_flags |= cpu_to_le32(OCFS2_ORPHANED_FL);
OCFS2_I(inode)->ip_flags &= ~OCFS2_INODE_SKIP_ORPHAN_DIR;
/* Record which orphan dir our inode now resides * in. delete_inode will use this to determine which orphan
* dir to lock. */
fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
}
status = ocfs2_journal_access_di(handle,
INODE_CACHE(orphan_dir_inode),
orphan_dir_bh,
OCFS2_JOURNAL_ACCESS_WRITE); if (status < 0) {
mlog_errno(status); goto leave;
}
/* find it's spot in the orphan directory */
status = ocfs2_find_entry(name, strlen(name), orphan_dir_inode,
&lookup); if (status) {
mlog_errno(status); goto leave;
}
/* remove it from the orphan directory */
status = ocfs2_delete_entry(handle, orphan_dir_inode, &lookup); 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))
ocfs2_add_links_count(orphan_fe, -1);
set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
ocfs2_journal_dirty(handle, orphan_dir_bh);
leave:
ocfs2_free_dir_lookup_result(&lookup);
if (status)
mlog_errno(status); return status;
}
/** * ocfs2_prep_new_orphaned_file() - Prepare the orphan dir to receive a newly * allocated file. This is different from the typical 'add to orphan dir' * operation in that the inode does not yet exist. This is a problem because * the orphan dir stringifies the inode block number to come up with it's * dirent. Obviously if the inode does not yet exist we have a chicken and egg * problem. This function works around it by calling deeper into the orphan * and suballoc code than other callers. Use this only by necessity. * @dir: The directory which this inode will ultimately wind up under - not the * orphan dir! * @dir_bh: buffer_head the @dir inode block * @orphan_name: string of length (CFS2_ORPHAN_NAMELEN + 1). Will be filled * with the string to be used for orphan dirent. Pass back to the orphan dir * code. * @ret_orphan_dir: orphan dir inode returned to be passed back into orphan * dir code. * @ret_di_blkno: block number where the new inode will be allocated. * @orphan_insert: Dir insert context to be passed back into orphan dir code. * @ret_inode_ac: Inode alloc context to be passed back to the allocator. * * Returns zero on success and the ret_orphan_dir, name and lookup * fields will be populated. * * Returns non-zero on failure.
*/ staticint ocfs2_prep_new_orphaned_file(struct inode *dir, struct buffer_head *dir_bh, char *orphan_name, struct inode **ret_orphan_dir,
u64 *ret_di_blkno, struct ocfs2_dir_lookup_result *orphan_insert, struct ocfs2_alloc_context **ret_inode_ac)
{ int ret;
u64 di_blkno; struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); struct inode *orphan_dir = NULL; struct buffer_head *orphan_dir_bh = NULL; struct ocfs2_alloc_context *inode_ac = NULL;
ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir, &orphan_dir_bh); if (ret < 0) {
mlog_errno(ret); return ret;
}
/* reserve an inode spot */
ret = ocfs2_reserve_new_inode(osb, &inode_ac); if (ret < 0) { if (ret != -ENOSPC)
mlog_errno(ret); goto out;
}
ret = ocfs2_find_new_inode_loc(dir, dir_bh, inode_ac,
&di_blkno); if (ret) {
mlog_errno(ret); goto out;
}
ret = __ocfs2_prepare_orphan_dir(orphan_dir, orphan_dir_bh,
di_blkno, orphan_name, orphan_insert, false); if (ret < 0) {
mlog_errno(ret); goto out;
}
out: if (ret == 0) {
*ret_orphan_dir = orphan_dir;
*ret_di_blkno = di_blkno;
*ret_inode_ac = inode_ac; /* * orphan_name and orphan_insert are already up to * date via prepare_orphan_dir
*/
} else { /* Unroll reserve_new_inode* */ if (inode_ac)
ocfs2_free_alloc_context(inode_ac);
status = ocfs2_inode_lock(dir, &parent_di_bh, 1); if (status < 0) { if (status != -ENOENT)
mlog_errno(status); return status;
}
status = ocfs2_prep_new_orphaned_file(dir, parent_di_bh,
orphan_name, &orphan_dir,
&di_blkno, &orphan_insert, &inode_ac); if (status < 0) { if (status != -ENOSPC)
mlog_errno(status); goto leave;
}
inode = ocfs2_get_init_inode(dir, mode); if (IS_ERR(inode)) {
status = PTR_ERR(inode);
inode = NULL;
mlog_errno(status); goto leave;
}
handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0)); if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status); goto leave;
}
status = dquot_alloc_inode(inode); if (status) goto leave;
did_quota_inode = 1;
status = ocfs2_claim_new_inode_at_loc(handle, dir, inode_ac,
&suballoc_loc,
&suballoc_bit, di_blkno); if (status < 0) {
mlog_errno(status); goto leave;
}
clear_nlink(inode); /* do the real work now. */
status = __ocfs2_mknod_locked(dir, inode,
0, &new_di_bh, handle,
inode_ac, di_blkno, suballoc_loc,
suballoc_bit); if (status < 0) {
mlog_errno(status); goto leave;
}
status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
&orphan_insert, orphan_dir, false); if (status < 0) {
mlog_errno(status); goto leave;
}
/* get open lock so that only nodes can't remove it from orphan dir. */
status = ocfs2_open_lock(inode); if (status < 0)
mlog_errno(status);
insert_inode_hash(inode);
leave: if (status < 0 && did_quota_inode)
dquot_free_inode(inode); if (handle)
ocfs2_commit_trans(osb, handle);
if (orphan_dir) { /* This was locked for us in ocfs2_prepare_orphan_dir() */
ocfs2_inode_unlock(orphan_dir, 1);
inode_unlock(orphan_dir);
iput(orphan_dir);
}
if ((status < 0) && inode) {
clear_nlink(inode);
iput(inode);
}
status = ocfs2_inode_lock(inode, &di_bh, 1); if (status < 0) {
mlog_errno(status); goto bail;
}
di = (struct ocfs2_dinode *) di_bh->b_data; /* * Another append dio crashed? * If so, manually recover it first.
*/ if (unlikely(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL))) {
status = ocfs2_truncate_file(inode, di_bh, i_size_read(inode)); if (status < 0) { if (status != -ENOSPC)
mlog_errno(status); goto bail_unlock_inode;
}
status = ocfs2_del_inode_from_orphan(osb, inode, di_bh, 0, 0); if (status < 0) {
mlog_errno(status); goto bail_unlock_inode;
}
}
status = ocfs2_prepare_orphan_dir(osb, &orphan_dir_inode,
OCFS2_I(inode)->ip_blkno,
orphan_name,
&orphan_insert, true); if (status < 0) {
mlog_errno(status); goto bail_unlock_inode;
}
handle = ocfs2_start_trans(osb,
OCFS2_INODE_ADD_TO_ORPHAN_CREDITS); if (IS_ERR(handle)) {
status = PTR_ERR(handle); goto bail_unlock_orphan;
}
--> --------------------
--> maximum size reached
--> --------------------
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