/*
* This routine is called when an inode is not connected to the
* directory tree.
*
* This subroutine returns 1 then the caller shouldn't bother with the
* rest of the pass 4 tests.
*/
static int disconnect_inode(e2fsck_t ctx, ext2_ino_t i,
struct ext2_inode *inode)
{
ext2_filsys fs = ctx->fs;
struct problem_context pctx;
__u32 eamagic = 0;
int extra_size = 0;
if (EXT2_INODE_SIZE(fs->super) > EXT2_GOOD_OLD_INODE_SIZE) {
e2fsck_read_inode_full(ctx, i, inode,EXT2_INODE_SIZE(fs->super),
"pass4: disconnect_inode");
extra_size = ((struct ext2_inode_large *)inode)->i_extra_isize;
} else {
e2fsck_read_inode(ctx, i, inode, "pass4: disconnect_inode");
}
clear_problem_context(&pctx);
pctx.ino = i;
pctx.inode = inode;
if (EXT2_INODE_SIZE(fs->super) -EXT2_GOOD_OLD_INODE_SIZE -extra_size >0)
eamagic = *(__u32 *)(((char *)inode) +EXT2_GOOD_OLD_INODE_SIZE +
extra_size);
/*
* Offer to delete any zero-length files that does not have
* blocks. If there is an EA block, it might have useful
* information, so we won't prompt to delete it, but let it be
* reconnected to lost+found.
*/
if (!inode->i_blocks && eamagic != EXT2_EXT_ATTR_MAGIC &&
(LINUX_S_ISREG(inode->i_mode) || LINUX_S_ISDIR(inode->i_mode))) {
if (fix_problem(ctx, PR_4_ZERO_LEN_INODE, &pctx)) {
e2fsck_clear_inode(ctx, i, inode, 0,
"disconnect_inode");
/*
* Fix up the bitmaps...
*/
e2fsck_read_bitmaps(ctx);
ext2fs_inode_alloc_stats2(fs, i, -1,
LINUX_S_ISDIR(inode->i_mode));
return 0;
}
}
/*
* Prompt to reconnect.
*/
if (fix_problem(ctx, PR_4_UNATTACHED_INODE, &pctx)) {
if (e2fsck_reconnect_file(ctx, i))
ext2fs_unmark_valid(fs);
} else {
/*
* If we don't attach the inode, then skip the
* i_links_test since there's no point in trying to
* force i_links_count to zero.
*/
ext2fs_unmark_valid(fs);
return 1;
}
return 0;
}
/*
* This routine is called when an inode is not connected to the
* directory tree.
*
* This subroutine returns 1 then the caller shouldn't bother with the
* rest of the pass 4 tests.
*/
static int disconnect_inode(e2fsck_t ctx, ext2_ino_t i)
{
ext2_filsys fs = ctx->fs;
struct ext2_inode inode;
struct problem_context pctx;
e2fsck_read_inode(ctx, i, &inode, "pass4: disconnect_inode");
clear_problem_context(&pctx);
pctx.ino = i;
pctx.inode = &inode;
/*
* Offer to delete any zero-length files that does not have
* blocks. If there is an EA block, it might have useful
* information, so we won't prompt to delete it, but let it be
* reconnected to lost+found.
*/
if (!inode.i_blocks && (LINUX_S_ISREG(inode.i_mode) ||
LINUX_S_ISDIR(inode.i_mode))) {
if (fix_problem(ctx, PR_4_ZERO_LEN_INODE, &pctx)) {
ext2fs_icount_store(ctx->inode_link_info, i, 0);
inode.i_links_count = 0;
inode.i_dtime = ctx->now;
e2fsck_write_inode(ctx, i, &inode,
"disconnect_inode");
/*
* Fix up the bitmaps...
*/
e2fsck_read_bitmaps(ctx);
ext2fs_unmark_inode_bitmap(ctx->inode_used_map, i);
ext2fs_unmark_inode_bitmap(ctx->inode_dir_map, i);
ext2fs_inode_alloc_stats2(fs, i, -1,
LINUX_S_ISDIR(inode.i_mode));
return 0;
}
}
/*
* Prompt to reconnect.
*/
if (fix_problem(ctx, PR_4_UNATTACHED_INODE, &pctx)) {
if (e2fsck_reconnect_file(ctx, i))
ext2fs_unmark_valid(fs);
} else {
/*
* If we don't attach the inode, then skip the
* i_links_test since there's no point in trying to
* force i_links_count to zero.
*/
ext2fs_unmark_valid(fs);
return 1;
}
return 0;
}
/*
* This subroutine is responsible for making sure that a particular
* directory is connected to the root; if it isn't we trace it up as
* far as we can go, and then offer to connect the resulting parent to
* the lost+found. We have to do loop detection; if we ever discover
* a loop, we treat that as a disconnected directory and offer to
* reparent it to lost+found.
*
* However, loop detection is expensive, because for very large
* filesystems, the inode_loop_detect bitmap is huge, and clearing it
* is non-trivial. Loops in filesystems are also a rare error case,
* and we shouldn't optimize for error cases. So we try two passes of
* the algorithm. The first time, we ignore loop detection and merely
* increment a counter; if the counter exceeds some extreme threshold,
* then we try again with the loop detection bitmap enabled.
*/
static int check_directory(e2fsck_t ctx, ext2_ino_t dir,
struct problem_context *pctx)
{
ext2_filsys fs = ctx->fs;
ext2_ino_t ino = dir, parent;
int loop_pass = 0, parent_count = 0;
while (1) {
/*
* Mark this inode as being "done"; by the time we
* return from this function, the inode we either be
* verified as being connected to the directory tree,
* or we will have offered to reconnect this to
* lost+found.
*
* If it was marked done already, then we've reached a
* parent we've already checked.
*/
if (ext2fs_mark_inode_bitmap2(inode_done_map, ino))
break;
if (e2fsck_dir_info_get_parent(ctx, ino, &parent)) {
fix_problem(ctx, PR_3_NO_DIRINFO, pctx);
return 0;
}
/*
* If this directory doesn't have a parent, or we've
* seen the parent once already, then offer to
* reparent it to lost+found
*/
if (!parent ||
(loop_pass &&
(ext2fs_test_inode_bitmap2(inode_loop_detect,
parent)))) {
pctx->ino = ino;
if (fix_problem(ctx, PR_3_UNCONNECTED_DIR, pctx)) {
if (e2fsck_reconnect_file(ctx, pctx->ino))
ext2fs_unmark_valid(fs);
else {
fix_dotdot(ctx, pctx->ino,
ctx->lost_and_found);
parent = ctx->lost_and_found;
}
}
break;
}
ino = parent;
if (loop_pass) {
ext2fs_mark_inode_bitmap2(inode_loop_detect, ino);
} else if (parent_count++ > 2048) {
/*
* If we've run into a path depth that's
* greater than 2048, try again with the inode
* loop bitmap turned on and start from the
* top.
*/
loop_pass = 1;
if (inode_loop_detect)
ext2fs_clear_inode_bitmap(inode_loop_detect);
else {
pctx->errcode = e2fsck_allocate_inode_bitmap(fs, _("inode loop detection bitmap"), EXT2FS_BMAP64_AUTODIR, "inode_loop_detect", &inode_loop_detect);
if (pctx->errcode) {
pctx->num = 1;
fix_problem(ctx,
PR_3_ALLOCATE_IBITMAP_ERROR, pctx);
ctx->flags |= E2F_FLAG_ABORT;
return -1;
}
}
ino = dir;
}
}
/*
* Make sure that .. and the parent directory are the same;
* offer to fix it if not.
*/
pctx->ino = dir;
if (e2fsck_dir_info_get_dotdot(ctx, dir, &pctx->ino2) ||
e2fsck_dir_info_get_parent(ctx, dir, &pctx->dir)) {
fix_problem(ctx, PR_3_NO_DIRINFO, pctx);
return 0;
}
if (pctx->ino2 != pctx->dir) {
if (fix_problem(ctx, PR_3_BAD_DOT_DOT, pctx))
fix_dotdot(ctx, dir, pctx->dir);
}
return 0;
}