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New API provided by mft.[hc]: 

ntfs_mft_record_alloc(), -- WIP
	ntfs_mft_record_free().

(Logical change 1.74)
edge.strict_endians
cantab.net!aia21 2002-12-29 21:37:21 +00:00
parent 2dbb7c23a5
commit be6376f85e
2 changed files with 93 additions and 1 deletions
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5
include/mft.h
View File

@ -23,6 +23,7 @@
#define _NTFS_MFT_H
#include "volume.h"
#include "inode.h"
#include "layout.h"
extern int ntfs_mft_records_read(const ntfs_volume *vol, const MFT_REF mref,
@ -100,5 +101,9 @@ static __inline__ u32 ntfs_mft_record_get_data_size(const MFT_RECORD *m)
return le32_to_cpu(m->bytes_in_use);
}
extern ntfs_inode *ntfs_mft_record_alloc(ntfs_volume *vol, u64 start);
extern int ntfs_mft_record_free(ntfs_volume *vol, ntfs_inode *ni);
#endif /* defined _NTFS_MFT_H */

89
libntfs/mft.c
View File

@ -23,11 +23,15 @@
#include <errno.h>
#include <string.h>
#include "mft.h"
#include "types.h"
#include "disk_io.h"
#include "debug.h"
#include "bitmap.h"
#include "attrib.h"
#include "inode.h"
#include "volume.h"
#include "layout.h"
#include "mft.h"
/**
* ntfs_mft_records_read - read records from the mft from disk
@ -231,3 +235,86 @@ read_failed:
return -1;
}
/**
* ntfs_mft_record_alloc - allocate an mft record on an ntfs volume
* @vol: mounted ntfs volume on which to allocate the mft record
* @start: starting mft record at which to allocate (or -1 if none)
*
* Allocate an mft record in $MFT/$DATA starting to search for a free record
* at mft record number @start or at the current allocator position if
* @start_mref is -1, on the mounted ntfs volume @vol.
*
* On success return the now opened ntfs inode of the mft record.
*
* On error return NULL with errno set to the error code.
*/
ntfs_inode *ntfs_mft_record_alloc(ntfs_volume *vol, u64 start)
{
if (!vol || !vol->mftbmp_na) {
errno = EINVAL;
return NULL;
}
errno = ENOTSUP;
return NULL;
}
/**
* ntfs_mft_record_free - free an mft record on an ntfs volume
* @vol: mounted ntfs volume on which to free the mft record
* @ni: open ntfs inode of the mft record to free
*
* Free the mft record of the open inode @ni on the mounted ntfs volume @vol.
* Note that this function calls ntfs_inode_close() internally and hence you
* cannot use the pointer @ni any more after this function returns success.
*
* On success return 0 and on error return -1 with errno set to the error code.
*/
int ntfs_mft_record_free(ntfs_volume *vol, ntfs_inode *ni)
{
u64 mft_no;
u16 seq_no;
if (!vol || !vol->mftbmp_na || !ni) {
errno = EINVAL;
return -1;
}
/* Cache the mft reference for later. */
mft_no = ni->mft_no;
/* Mark the mft record as not in use. */
ni->mrec->flags &= ~MFT_RECORD_IN_USE;
/* Increment the sequence number, skipping zero, if it is not zero. */
seq_no = le16_to_cpu(ni->mrec->sequence_number);
if (seq_no == 0xffff)
seq_no = 1;
else if (seq_no)
seq_no++;
ni->mrec->sequence_number = cpu_to_le16(seq_no);
/* Set the inode dirty and close it so it is written out. */
ntfs_inode_mark_dirty(ni);
if (ntfs_inode_close(ni)) {
int eo = errno;
// FIXME: Eeek! We need rollback! (AIA)
fprintf(stderr, "%s(): Eeek! Failed to close the inode."
"Leaving inconsistent metadata!\n",
__FUNCTION__);
errno = eo;
return -1;
}
/* Clear the bit in the $MFT/$BITMAP corresponding to this record. */
if (ntfs_bitmap_clear_run(vol->mftbmp_na, mft_no, 1)) {
// FIXME: Eeek! We need rollback! (AIA)
fprintf(stderr, "%s(): Eeek! Failed to clear the allocation "
"in the mft bitmap. Leaving deleted mft record "
"marked as in use in the mft bitmap and "
"pretending we succeeded. Error: %s\n",
__FUNCTION__, strerror(errno));
}
return 0;
}