NTFS: - Split ntfs_map_runlist() into ntfs_map_runlist() and a non-locking
helper ntfs_map_runlist_nolock() which is used by ntfs_map_runlist().
This allows us to map runlist fragments with the runlist lock already
held without having to drop and reacquire it around the call. Adapt
all callers.
- Change ntfs_find_vcn() to ntfs_find_vcn_nolock() which takes a locked
runlist. This allows us to find runlist elements with the runlist
lock already held without having to drop and reacquire it around the
call. Adapt all callers.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c
index 4e0bf39..0975d73 100644
--- a/fs/ntfs/mft.c
+++ b/fs/ntfs/mft.c
@@ -1,7 +1,7 @@
/**
* mft.c - NTFS kernel mft record operations. Part of the Linux-NTFS project.
*
- * Copyright (c) 2001-2004 Anton Altaparmakov
+ * Copyright (c) 2001-2005 Anton Altaparmakov
* Copyright (c) 2002 Richard Russon
*
* This program/include file is free software; you can redistribute it and/or
@@ -287,7 +287,7 @@
}
unmap_mft_record(ni);
ntfs_error(base_ni->vol->sb, "Found stale extent mft "
- "reference! Corrupt file system. "
+ "reference! Corrupt filesystem. "
"Run chkdsk.");
return ERR_PTR(-EIO);
}
@@ -318,7 +318,7 @@
/* Verify the sequence number if it is present. */
if (seq_no && (le16_to_cpu(m->sequence_number) != seq_no)) {
ntfs_error(base_ni->vol->sb, "Found stale extent mft "
- "reference! Corrupt file system. Run chkdsk.");
+ "reference! Corrupt filesystem. Run chkdsk.");
destroy_ni = TRUE;
m = ERR_PTR(-EIO);
goto unm_err_out;
@@ -1292,19 +1292,20 @@
/*
* Determine the last lcn of the mft bitmap. The allocated size of the
* mft bitmap cannot be zero so we are ok to do this.
- * ntfs_find_vcn() returns the runlist locked on success.
*/
+ down_write(&mftbmp_ni->runlist.lock);
read_lock_irqsave(&mftbmp_ni->size_lock, flags);
ll = mftbmp_ni->allocated_size;
read_unlock_irqrestore(&mftbmp_ni->size_lock, flags);
- rl = ntfs_find_vcn(mftbmp_ni, (ll - 1) >> vol->cluster_size_bits, TRUE);
+ rl = ntfs_find_vcn_nolock(mftbmp_ni,
+ (ll - 1) >> vol->cluster_size_bits, TRUE);
if (unlikely(IS_ERR(rl) || !rl->length || rl->lcn < 0)) {
+ up_write(&mftbmp_ni->runlist.lock);
ntfs_error(vol->sb, "Failed to determine last allocated "
"cluster of mft bitmap attribute.");
- if (!IS_ERR(rl)) {
- up_write(&mftbmp_ni->runlist.lock);
+ if (!IS_ERR(rl))
ret = -EIO;
- } else
+ else
ret = PTR_ERR(rl);
return ret;
}
@@ -1428,6 +1429,8 @@
// TODO: Deal with this by moving this extent to a new mft
// record or by starting a new extent in a new mft record or by
// moving other attributes out of this mft record.
+ // Note: It will need to be a special mft record and if none of
+ // those are available it gets rather complicated...
ntfs_error(vol->sb, "Not enough space in this mft record to "
"accomodate extended mft bitmap attribute "
"extent. Cannot handle this yet.");
@@ -1719,19 +1722,20 @@
* Determine the preferred allocation location, i.e. the last lcn of
* the mft data attribute. The allocated size of the mft data
* attribute cannot be zero so we are ok to do this.
- * ntfs_find_vcn() returns the runlist locked on success.
*/
+ down_write(&mft_ni->runlist.lock);
read_lock_irqsave(&mft_ni->size_lock, flags);
ll = mft_ni->allocated_size;
read_unlock_irqrestore(&mft_ni->size_lock, flags);
- rl = ntfs_find_vcn(mft_ni, (ll - 1) >> vol->cluster_size_bits, TRUE);
+ rl = ntfs_find_vcn_nolock(mft_ni, (ll - 1) >> vol->cluster_size_bits,
+ TRUE);
if (unlikely(IS_ERR(rl) || !rl->length || rl->lcn < 0)) {
+ up_write(&mft_ni->runlist.lock);
ntfs_error(vol->sb, "Failed to determine last allocated "
"cluster of mft data attribute.");
- if (!IS_ERR(rl)) {
- up_write(&mft_ni->runlist.lock);
+ if (!IS_ERR(rl))
ret = -EIO;
- } else
+ else
ret = PTR_ERR(rl);
return ret;
}
@@ -1858,7 +1862,11 @@
// moving other attributes out of this mft record.
// Note: Use the special reserved mft records and ensure that
// this extent is not required to find the mft record in
- // question.
+ // question. If no free special records left we would need to
+ // move an existing record away, insert ours in its place, and
+ // then place the moved record into the newly allocated space
+ // and we would then need to update all references to this mft
+ // record appropriately. This is rather complicated...
ntfs_error(vol->sb, "Not enough space in this mft record to "
"accomodate extended mft data attribute "
"extent. Cannot handle this yet.");
@@ -2021,7 +2029,7 @@
"reports this as corruption, please email "
"linux-ntfs-dev@lists.sourceforge.net stating "
"that you saw this message and that the "
- "modified file system created was corrupt. "
+ "modified filesystem created was corrupt. "
"Thank you.");
}
/* Set the update sequence number to 1. */
