1997-04-26 17:21:57 +04:00
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/*
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1997-04-29 20:17:09 +04:00
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* link.c --- create links in a ext2fs directory
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2008-08-28 07:07:54 +04:00
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*
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1997-04-29 20:17:09 +04:00
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* Copyright (C) 1993, 1994 Theodore Ts'o.
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*
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* %Begin-Header%
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2010-05-18 05:31:56 +04:00
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* This file may be redistributed under the terms of the GNU Library
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* General Public License, version 2.
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1997-04-29 20:17:09 +04:00
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* %End-Header%
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1997-04-26 17:21:57 +04:00
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*/
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2011-09-19 01:34:37 +04:00
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#include "config.h"
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1997-04-26 17:21:57 +04:00
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#include <stdio.h>
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#include <string.h>
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1997-08-11 03:07:40 +04:00
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#if HAVE_UNISTD_H
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1997-04-26 17:21:57 +04:00
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#include <unistd.h>
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1997-08-11 03:07:40 +04:00
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#endif
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1997-04-26 17:34:30 +04:00
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Many files:
inode.c (ext2fs_open_inode_scan): Initialize the group variables
so that we don't need to call get_next_blockgroup() the first
time around. Saves a bit of time, and prevents us from
needing to assign -1 to current_group (which is an unsigned
value).
icount.c (insert_icount_el): Cast the estimated number of inodes
from a float to an ino_t.
alloc.c, alloc_tables.c, badlbocks.c, bb_compat.c, bb_inode.c,
bitmaps.c, bitops.c, block.c, bmap.c, bmove.c, brel_ma.c,
check_desc.c, closefs.c, cmp_bitmaps.c, dblist.c,
dblist_dir.c, dir_iterate.c, dirblock.c, dupfs.c, expanddir.c,
ext2fs.h, fileio.c, freefs.c, get_pathname.c, getsize.c,
icount.c, initialize.c, inline.c, inode.c, irel_ma.c,
ismounted.c, link.c, lookup.c, mkdir.c, namei.c, native.c,
newdir.c, openfs.c, read_bb.c, read_bb_file.c, rs_bitmap.c,
rw_bitmaps.c, swapfs.c, test_io.c, tst_badblocks.c,
tst_getsize.c, tst_iscan.c, unix_io.c, unlink.c, valid_blk.c,
version.c: If EXT2_FLAT_INCLUDES is defined, then assume all
of the ext2-specific header files are in a flat directory.
block.c, bmove.c, dirblock.c, fileio.c: Explicitly cast
all assignments from void * to be compatible with C++.
closefs.c (ext2fs_flush): Add a call to io_channel_flush() to
make sure the contents of the disk are flushed to disk.
dblist.c (ext2fs_add_dir_block): Change new to be new_entry to
avoid C++ namespace clash.
bitmaps.c (ext2fs_copy_bitmap): Change new to be new_map to
avoid C++ namespace clash.
ext2fs.h, bb_inode.c, block.c, bmove.c, brel.h, brel_ma.c,
irel.h, irel_ma.c, dblist.c, dblist_dir.c, dir_iterate.c,
ext2fsP.h, expanddir.c, get_pathname.c, inode.c, link.c,
unlink.c: Change private to be priv_data (to avoid C++
namespace clash)
1998-01-19 17:47:53 +03:00
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#include "ext2_fs.h"
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1997-04-26 17:21:57 +04:00
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#include "ext2fs.h"
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struct link_struct {
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2009-06-22 05:07:38 +04:00
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ext2_filsys fs;
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1997-04-26 17:21:57 +04:00
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const char *name;
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int namelen;
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Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
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ext2_ino_t inode;
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1997-04-26 17:21:57 +04:00
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int flags;
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int done;
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2008-08-26 05:08:19 +04:00
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unsigned int blocksize;
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2009-06-22 05:07:38 +04:00
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errcode_t err;
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2001-01-01 19:17:12 +03:00
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struct ext2_super_block *sb;
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2008-08-28 07:07:54 +04:00
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};
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1997-04-26 17:21:57 +04:00
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static int link_proc(struct ext2_dir_entry *dirent,
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int offset,
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int blocksize,
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char *buf,
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Many files:
inode.c (ext2fs_open_inode_scan): Initialize the group variables
so that we don't need to call get_next_blockgroup() the first
time around. Saves a bit of time, and prevents us from
needing to assign -1 to current_group (which is an unsigned
value).
icount.c (insert_icount_el): Cast the estimated number of inodes
from a float to an ino_t.
alloc.c, alloc_tables.c, badlbocks.c, bb_compat.c, bb_inode.c,
bitmaps.c, bitops.c, block.c, bmap.c, bmove.c, brel_ma.c,
check_desc.c, closefs.c, cmp_bitmaps.c, dblist.c,
dblist_dir.c, dir_iterate.c, dirblock.c, dupfs.c, expanddir.c,
ext2fs.h, fileio.c, freefs.c, get_pathname.c, getsize.c,
icount.c, initialize.c, inline.c, inode.c, irel_ma.c,
ismounted.c, link.c, lookup.c, mkdir.c, namei.c, native.c,
newdir.c, openfs.c, read_bb.c, read_bb_file.c, rs_bitmap.c,
rw_bitmaps.c, swapfs.c, test_io.c, tst_badblocks.c,
tst_getsize.c, tst_iscan.c, unix_io.c, unlink.c, valid_blk.c,
version.c: If EXT2_FLAT_INCLUDES is defined, then assume all
of the ext2-specific header files are in a flat directory.
block.c, bmove.c, dirblock.c, fileio.c: Explicitly cast
all assignments from void * to be compatible with C++.
closefs.c (ext2fs_flush): Add a call to io_channel_flush() to
make sure the contents of the disk are flushed to disk.
dblist.c (ext2fs_add_dir_block): Change new to be new_entry to
avoid C++ namespace clash.
bitmaps.c (ext2fs_copy_bitmap): Change new to be new_map to
avoid C++ namespace clash.
ext2fs.h, bb_inode.c, block.c, bmove.c, brel.h, brel_ma.c,
irel.h, irel_ma.c, dblist.c, dblist_dir.c, dir_iterate.c,
ext2fsP.h, expanddir.c, get_pathname.c, inode.c, link.c,
unlink.c: Change private to be priv_data (to avoid C++
namespace clash)
1998-01-19 17:47:53 +03:00
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void *priv_data)
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1997-04-26 17:21:57 +04:00
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{
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Many files:
inode.c (ext2fs_open_inode_scan): Initialize the group variables
so that we don't need to call get_next_blockgroup() the first
time around. Saves a bit of time, and prevents us from
needing to assign -1 to current_group (which is an unsigned
value).
icount.c (insert_icount_el): Cast the estimated number of inodes
from a float to an ino_t.
alloc.c, alloc_tables.c, badlbocks.c, bb_compat.c, bb_inode.c,
bitmaps.c, bitops.c, block.c, bmap.c, bmove.c, brel_ma.c,
check_desc.c, closefs.c, cmp_bitmaps.c, dblist.c,
dblist_dir.c, dir_iterate.c, dirblock.c, dupfs.c, expanddir.c,
ext2fs.h, fileio.c, freefs.c, get_pathname.c, getsize.c,
icount.c, initialize.c, inline.c, inode.c, irel_ma.c,
ismounted.c, link.c, lookup.c, mkdir.c, namei.c, native.c,
newdir.c, openfs.c, read_bb.c, read_bb_file.c, rs_bitmap.c,
rw_bitmaps.c, swapfs.c, test_io.c, tst_badblocks.c,
tst_getsize.c, tst_iscan.c, unix_io.c, unlink.c, valid_blk.c,
version.c: If EXT2_FLAT_INCLUDES is defined, then assume all
of the ext2-specific header files are in a flat directory.
block.c, bmove.c, dirblock.c, fileio.c: Explicitly cast
all assignments from void * to be compatible with C++.
closefs.c (ext2fs_flush): Add a call to io_channel_flush() to
make sure the contents of the disk are flushed to disk.
dblist.c (ext2fs_add_dir_block): Change new to be new_entry to
avoid C++ namespace clash.
bitmaps.c (ext2fs_copy_bitmap): Change new to be new_map to
avoid C++ namespace clash.
ext2fs.h, bb_inode.c, block.c, bmove.c, brel.h, brel_ma.c,
irel.h, irel_ma.c, dblist.c, dblist_dir.c, dir_iterate.c,
ext2fsP.h, expanddir.c, get_pathname.c, inode.c, link.c,
unlink.c: Change private to be priv_data (to avoid C++
namespace clash)
1998-01-19 17:47:53 +03:00
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struct link_struct *ls = (struct link_struct *) priv_data;
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1997-04-26 17:21:57 +04:00
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struct ext2_dir_entry *next;
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2009-06-22 05:07:38 +04:00
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unsigned int rec_len, min_rec_len, curr_rec_len;
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1997-04-26 17:21:57 +04:00
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int ret = 0;
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2012-08-03 01:27:43 +04:00
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int csum_size = 0;
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2013-10-13 07:14:40 +04:00
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struct ext2_dir_entry_tail *t;
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1997-04-26 17:21:57 +04:00
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2013-10-01 05:26:55 +04:00
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if (ls->done)
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2013-10-18 08:49:01 +04:00
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return DIRENT_ABORT;
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1997-04-26 17:21:57 +04:00
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rec_len = EXT2_DIR_REC_LEN(ls->namelen);
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2009-06-22 05:07:38 +04:00
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ls->err = ext2fs_get_rec_len(ls->fs, dirent, &curr_rec_len);
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if (ls->err)
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return DIRENT_ABORT;
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2008-08-26 05:08:19 +04:00
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2012-08-03 01:27:43 +04:00
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if (EXT2_HAS_RO_COMPAT_FEATURE(ls->fs->super,
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EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
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csum_size = sizeof(struct ext2_dir_entry_tail);
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1997-04-26 17:21:57 +04:00
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/*
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* See if the following directory entry (if any) is unused;
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* if so, absorb it into this one.
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*/
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2008-08-26 05:08:19 +04:00
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next = (struct ext2_dir_entry *) (buf + offset + curr_rec_len);
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2012-08-03 01:27:43 +04:00
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if ((offset + (int) curr_rec_len < blocksize - (8 + csum_size)) &&
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1997-04-26 17:21:57 +04:00
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(next->inode == 0) &&
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2011-07-07 21:50:22 +04:00
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(offset + (int) curr_rec_len + (int) next->rec_len <= blocksize)) {
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2009-06-22 05:07:38 +04:00
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curr_rec_len += next->rec_len;
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ls->err = ext2fs_set_rec_len(ls->fs, curr_rec_len, dirent);
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if (ls->err)
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return DIRENT_ABORT;
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1997-04-26 17:21:57 +04:00
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ret = DIRENT_CHANGED;
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}
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2013-10-13 07:14:40 +04:00
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/*
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* Since ext2fs_link blows away htree data, we need to be
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* careful -- if metadata_csum is enabled and we're passed in
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* a dirent that contains htree data, we need to create the
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* fake entry at the end of the block that hides the checksum.
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*/
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/* De-convert a dx_node block */
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if (csum_size &&
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curr_rec_len == ls->fs->blocksize &&
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!dirent->inode) {
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curr_rec_len -= csum_size;
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ls->err = ext2fs_set_rec_len(ls->fs, curr_rec_len, dirent);
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if (ls->err)
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return DIRENT_ABORT;
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t = EXT2_DIRENT_TAIL(buf, ls->fs->blocksize);
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ext2fs_initialize_dirent_tail(ls->fs, t);
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ret = DIRENT_CHANGED;
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}
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/* De-convert a dx_root block */
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if (csum_size &&
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curr_rec_len == ls->fs->blocksize - EXT2_DIR_REC_LEN(1) &&
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offset == EXT2_DIR_REC_LEN(1) &&
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dirent->name[0] == '.' && dirent->name[1] == '.') {
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curr_rec_len -= csum_size;
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ls->err = ext2fs_set_rec_len(ls->fs, curr_rec_len, dirent);
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if (ls->err)
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return DIRENT_ABORT;
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t = EXT2_DIRENT_TAIL(buf, ls->fs->blocksize);
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ext2fs_initialize_dirent_tail(ls->fs, t);
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ret = DIRENT_CHANGED;
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}
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1997-04-26 17:21:57 +04:00
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/*
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* If the directory entry is used, see if we can split the
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* directory entry to make room for the new name. If so,
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* truncate it and return.
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*/
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if (dirent->inode) {
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2013-06-08 19:26:14 +04:00
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min_rec_len = EXT2_DIR_REC_LEN(ext2fs_dirent_name_len(dirent));
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2008-08-26 05:08:19 +04:00
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if (curr_rec_len < (min_rec_len + rec_len))
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1997-04-26 17:21:57 +04:00
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return ret;
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2008-08-26 05:08:19 +04:00
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rec_len = curr_rec_len - min_rec_len;
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2009-06-22 05:07:38 +04:00
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ls->err = ext2fs_set_rec_len(ls->fs, min_rec_len, dirent);
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if (ls->err)
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return DIRENT_ABORT;
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1997-04-26 17:21:57 +04:00
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next = (struct ext2_dir_entry *) (buf + offset +
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dirent->rec_len);
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next->inode = 0;
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2013-06-08 19:26:14 +04:00
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ext2fs_dirent_set_name_len(next, 0);
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ext2fs_dirent_set_file_type(next, 0);
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2009-06-22 05:07:38 +04:00
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ls->err = ext2fs_set_rec_len(ls->fs, rec_len, next);
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if (ls->err)
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return DIRENT_ABORT;
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1997-04-26 17:21:57 +04:00
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return DIRENT_CHANGED;
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}
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/*
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* If we get this far, then the directory entry is not used.
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* See if we can fit the request entry in. If so, do it.
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*/
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2008-08-26 05:08:19 +04:00
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if (curr_rec_len < rec_len)
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1997-04-26 17:21:57 +04:00
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return ret;
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dirent->inode = ls->inode;
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2013-06-08 19:26:14 +04:00
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ext2fs_dirent_set_name_len(dirent, ls->namelen);
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1997-04-26 17:21:57 +04:00
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strncpy(dirent->name, ls->name, ls->namelen);
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1999-10-23 04:58:54 +04:00
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if (ls->sb->s_feature_incompat & EXT2_FEATURE_INCOMPAT_FILETYPE)
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2013-06-08 19:26:14 +04:00
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ext2fs_dirent_set_file_type(dirent, ls->flags & 0x7);
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1997-04-26 17:21:57 +04:00
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ls->done++;
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return DIRENT_ABORT|DIRENT_CHANGED;
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}
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1999-10-23 04:58:54 +04:00
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/*
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* Note: the low 3 bits of the flags field are used as the directory
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* entry filetype.
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*/
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Many files:
dosio.c: New file to do DOS/BIOS disk accesses.
namei.c (open_namei): Make pathlen be of type size_t.
llseek.c: Always #include stdlib.h since it's need to define
size_t.
io.h: Use errcode_t for magic numbers.
icount.c (get_icount_el), dupfs.c (ext2fs_dup_handle), dblist.c
(dir_block_cmp): Use size_t where appropriate.
read_bb.c (ext2fs_read_bb_inode), cmp_bitmaps.c
(ext2fs_compare_inode_bitmap): Use blk_t, ino_t and size_t
where appropriate.
closefs.c (ext2fs_flush): Use dgrp_t instead of int where
appropriate.
openfs.c (ext2fs_open), check_desc.c (ext2fs_check_desc): Use blk_t
instead of int where appropriate.
rw_bitmaps.c (read_bitmaps), irel_ma.c, inode.c (ext2fs_write_inode),
initialize.c (ext2fs_initialize): brel_ma.c: Fix to make be
16-bit safe.
link.c (ext2fs_link), unlink.c (ext2fs_unlink), lookup.c (lookup_proc),
ismounted.c (ext2fs_check_if_mounted), block.c (xlate_func):
Add #pragma argsused for Turbo C.
1997-08-12 00:29:22 +04:00
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#ifdef __TURBOC__
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Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
|
|
|
#pragma argsused
|
Many files:
dosio.c: New file to do DOS/BIOS disk accesses.
namei.c (open_namei): Make pathlen be of type size_t.
llseek.c: Always #include stdlib.h since it's need to define
size_t.
io.h: Use errcode_t for magic numbers.
icount.c (get_icount_el), dupfs.c (ext2fs_dup_handle), dblist.c
(dir_block_cmp): Use size_t where appropriate.
read_bb.c (ext2fs_read_bb_inode), cmp_bitmaps.c
(ext2fs_compare_inode_bitmap): Use blk_t, ino_t and size_t
where appropriate.
closefs.c (ext2fs_flush): Use dgrp_t instead of int where
appropriate.
openfs.c (ext2fs_open), check_desc.c (ext2fs_check_desc): Use blk_t
instead of int where appropriate.
rw_bitmaps.c (read_bitmaps), irel_ma.c, inode.c (ext2fs_write_inode),
initialize.c (ext2fs_initialize): brel_ma.c: Fix to make be
16-bit safe.
link.c (ext2fs_link), unlink.c (ext2fs_unlink), lookup.c (lookup_proc),
ismounted.c (ext2fs_check_if_mounted), block.c (xlate_func):
Add #pragma argsused for Turbo C.
1997-08-12 00:29:22 +04:00
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|
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#endif
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2008-08-28 07:07:54 +04:00
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errcode_t ext2fs_link(ext2_filsys fs, ext2_ino_t dir, const char *name,
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Many files:
alloc.c, bb_inode.c, bitmaps.c, bitops.h, block.c, bmap.c, bmove.c,
brel.h, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c,
expanddir.c, ext2fs.h, ext2fsP.h, fileio.c, finddev.c, get_pathname.c,
icount.c, inode.c, irel.h, irel_ma.c, ismounted.c, link.c, lookup.c,
mkdir.c, mkjournal.c, namei.c, newdir.c, read_bb_file.c, test_io.c,
tst_iscan.c, unix_io.c, unlink.c: Change use of ino_t to ext2_ino_t,
to protect applications that attempt to compile
-D_FILE_OFFSET_BITS=64, since this inexplicably changes ino_t(!?). So
we use ext2_ino_t to avoid an unexpected ABI change.
2001-01-11 07:54:39 +03:00
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ext2_ino_t ino, int flags)
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1997-04-26 17:21:57 +04:00
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{
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2002-07-30 03:26:33 +04:00
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errcode_t retval;
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struct link_struct ls;
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struct ext2_inode inode;
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1997-04-26 17:21:57 +04:00
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1997-04-26 17:34:30 +04:00
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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1997-04-26 17:21:57 +04:00
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if (!(fs->flags & EXT2_FLAG_RW))
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return EXT2_ET_RO_FILSYS;
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2009-06-22 05:07:38 +04:00
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ls.fs = fs;
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1997-04-26 17:21:57 +04:00
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ls.name = name;
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ls.namelen = name ? strlen(name) : 0;
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ls.inode = ino;
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1999-10-23 04:58:54 +04:00
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ls.flags = flags;
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1997-04-26 17:21:57 +04:00
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ls.done = 0;
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2001-01-01 19:17:12 +03:00
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ls.sb = fs->super;
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2008-08-26 05:08:19 +04:00
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ls.blocksize = fs->blocksize;
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2009-06-22 05:07:38 +04:00
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ls.err = 0;
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1997-04-26 17:21:57 +04:00
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retval = ext2fs_dir_iterate(fs, dir, DIRENT_FLAG_INCLUDE_EMPTY,
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0, link_proc, &ls);
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if (retval)
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return retval;
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2009-06-22 05:07:38 +04:00
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if (ls.err)
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return ls.err;
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1997-04-26 17:21:57 +04:00
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2002-07-30 03:26:33 +04:00
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if (!ls.done)
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return EXT2_ET_DIR_NO_SPACE;
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if ((retval = ext2fs_read_inode(fs, dir, &inode)) != 0)
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return retval;
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2013-10-13 07:14:40 +04:00
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/*
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* If this function changes to preserve the htree, remove the
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* two hunks in link_proc that shove checksum tails into the
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* former dx_root/dx_node blocks.
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*/
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2002-07-30 03:26:33 +04:00
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if (inode.i_flags & EXT2_INDEX_FL) {
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inode.i_flags &= ~EXT2_INDEX_FL;
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if ((retval = ext2fs_write_inode(fs, dir, &inode)) != 0)
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return retval;
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}
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return 0;
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1997-04-26 17:21:57 +04:00
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}
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