[PATCH 4/17] NTFS: - Change ntfs_cluster_alloc() to take an extra boolean parameter

Anton Altaparmakov
2005-10-31T14:27:34Z

NTFS: - Change ntfs_cluster_alloc() to take an extra boolean parameter
specifying whether the cluster are being allocated to extend an
attribute or to fill a hole.
- Change ntfs_attr_make_non_resident() to call ntfs_cluster_alloc()
with @is_extension set to TRUE and remove the runlist terminator
fixup code as this is now done by ntfs_cluster_alloc().

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

---

fs/ntfs/ChangeLog | 6 ++++++
fs/ntfs/attrib.c | 10 +---------
fs/ntfs/lcnalloc.c | 15 ++++++++++++---
fs/ntfs/lcnalloc.h | 3 ++-
fs/ntfs/mft.c | 6 ++++--
5 files changed, 25 insertions(+), 15 deletions(-)

applies-to: 142b89f44ebb15f2db326a246e0eb6c454ade6e7
fc0fa7dc7d243afabdb3fb6a11d59a944a9c91f8
diff --git a/fs/ntfs/ChangeLog b/fs/ntfs/ChangeLog
index 6e4f44e..aad2a3f 100644
--- a/fs/ntfs/ChangeLog
+++ b/fs/ntfs/ChangeLog
@@ -31,6 +31,12 @@ ToDo/Notes:
- Fix potential deadlock in ntfs_mft_data_extend_allocation_nolock()
error handling by passing in the active search context when calling
ntfs_cluster_free().
+ - Change ntfs_cluster_alloc() to take an extra boolean parameter
+ specifying whether the cluster are being allocated to extend an
+ attribute or to fill a hole.
+ - Change ntfs_attr_make_non_resident() to call ntfs_cluster_alloc()
+ with @is_extension set to TRUE and remove the runlist terminator
+ fixup code as this is now done by ntfs_cluster_alloc().

2.1.24 - Lots of bug fixes and support more clean journal states.

diff --git a/fs/ntfs/attrib.c b/fs/ntfs/attrib.c
index 2aafc87..33e689f 100644
--- a/fs/ntfs/attrib.c
+++ b/fs/ntfs/attrib.c
@@ -1566,8 +1566,6 @@ int ntfs_attr_make_non_resident(ntfs_ino
new_size = (i_size_read(vi) + vol->cluster_size - 1) &
~(vol->cluster_size - 1);
if (new_size > 0) {
- runlist_element *rl2;
-
/*
* Will need the page later and since the page lock nests
* outside all ntfs locks, we need to get the page now.
@@ -1578,7 +1576,7 @@ int ntfs_attr_make_non_resident(ntfs_ino
return -ENOMEM;
/* Start by allocating clusters to hold the attribute value. */
rl = ntfs_cluster_alloc(vol, 0, new_size >>
- vol->cluster_size_bits, -1, DATA_ZONE);
+ vol->cluster_size_bits, -1, DATA_ZONE, TRUE);
if (IS_ERR(rl)) {
err = PTR_ERR(rl);
ntfs_debug("Failed to allocate cluster%s, error code "
@@ -1587,12 +1585,6 @@ int ntfs_attr_make_non_resident(ntfs_ino
err);
goto page_err_out;
}
- /* Change the runlist terminator to LCN_ENOENT. */
- rl2 = rl;
- while (rl2->length)
- rl2++;
- BUG_ON(rl2->lcn != LCN_RL_NOT_MAPPED);
- rl2->lcn = LCN_ENOENT;
} else {
rl = NULL;
page = NULL;
diff --git a/fs/ntfs/lcnalloc.c b/fs/ntfs/lcnalloc.c
index 75313f4..29cabf9 100644
--- a/fs/ntfs/lcnalloc.c
+++ b/fs/ntfs/lcnalloc.c
@@ -76,6 +76,7 @@ int ntfs_cluster_free_from_rl_nolock(ntf
* @count: number of clusters to allocate
* @start_lcn: starting lcn at which to allocate the clusters (or -1 if none)
* @zone: zone from which to allocate the clusters
+ * @is_extension: if TRUE, this is an attribute extension
*
* Allocate @count clusters preferably starting at cluster @start_lcn or at the
* current allocator position if @start_lcn is -1, on the mounted ntfs volume
@@ -86,6 +87,13 @@ int ntfs_cluster_free_from_rl_nolock(ntf
* @start_vcn specifies the vcn of the first allocated cluster. This makes
* merging the resulting runlist with the old runlist easier.
*
+ * If @is_extension is TRUE, the caller is allocating clusters to extend an
+ * attribute and if it is FALSE, the caller is allocating clusters to fill a
+ * hole in an attribute. Practically the difference is that if @is_extension
+ * is TRUE the returned runlist will be terminated with LCN_ENOENT and if
+ * @is_extension is FALSE the runlist will be terminated with
+ * LCN_RL_NOT_MAPPED.
+ *
* You need to check the return value with IS_ERR(). If this is false, the
* function was successful and the return value is a runlist describing the
* allocated cluster(s). If IS_ERR() is true, the function failed and
@@ -137,7 +145,8 @@ int ntfs_cluster_free_from_rl_nolock(ntf
*/
runlist_element *ntfs_cluster_alloc(ntfs_volume *vol, const VCN start_vcn,
const s64 count, const LCN start_lcn,
- const NTFS_CLUSTER_ALLOCATION_ZONES zone)
+ const NTFS_CLUSTER_ALLOCATION_ZONES zone,
+ const BOOL is_extension)
{
LCN zone_start, zone_end, bmp_pos, bmp_initial_pos, last_read_pos, lcn;
LCN prev_lcn = 0, prev_run_len = 0, mft_zone_size;
@@ -310,7 +319,7 @@ runlist_element *ntfs_cluster_alloc(ntfs
continue;
}
bit = 1 << (lcn & 7);
- ntfs_debug("bit %i.", bit);
+ ntfs_debug("bit 0x%x.", bit);
/* If the bit is already set, go onto the next one. */
if (*byte & bit) {
lcn++;
@@ -729,7 +738,7 @@ out:
/* Add runlist terminator element. */
if (likely(rl)) {
rl[rlpos].vcn = rl[rlpos - 1].vcn + rl[rlpos - 1].length;
- rl[rlpos].lcn = LCN_RL_NOT_MAPPED;
+ rl[rlpos].lcn = is_extension ? LCN_ENOENT : LCN_RL_NOT_MAPPED;
rl[rlpos].length = 0;
}
if (likely(page && !IS_ERR(page))) {
diff --git a/fs/ntfs/lcnalloc.h b/fs/ntfs/lcnalloc.h
index aa05185..72cbca7 100644
--- a/fs/ntfs/lcnalloc.h
+++ b/fs/ntfs/lcnalloc.h
@@ -42,7 +42,8 @@ typedef enum {

extern runlist_element *ntfs_cluster_alloc(ntfs_volume *vol,
const VCN start_vcn, const s64 count, const LCN start_lcn,
- const NTFS_CLUSTER_ALLOCATION_ZONES zone);
+ const NTFS_CLUSTER_ALLOCATION_ZONES zone,
+ const BOOL is_extension);

extern s64 __ntfs_cluster_free(ntfs_inode *ni, const VCN start_vcn,
s64 count, ntfs_attr_search_ctx *ctx, const BOOL is_rollback);
diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c
index 5577fc6..0c65cbb 100644
--- a/fs/ntfs/mft.c
+++ b/fs/ntfs/mft.c
@@ -1355,7 +1355,8 @@ static int ntfs_mft_bitmap_extend_alloca
up_write(&vol->lcnbmp_lock);
ntfs_unmap_page(page);
/* Allocate a cluster from the DATA_ZONE. */
- rl2 = ntfs_cluster_alloc(vol, rl[1].vcn, 1, lcn, DATA_ZONE);
+ rl2 = ntfs_cluster_alloc(vol, rl[1].vcn, 1, lcn, DATA_ZONE,
+ TRUE);
if (IS_ERR(rl2)) {
up_write(&mftbmp_ni->runlist.lock);
ntfs_error(vol->sb, "Failed to allocate a cluster for "
@@ -1780,7 +1781,8 @@ static int ntfs_mft_data_extend_allocati
nr > min_nr ? "default" : "minimal", (long long)nr);
old_last_vcn = rl[1].vcn;
do {
- rl2 = ntfs_cluster_alloc(vol, old_last_vcn, nr, lcn, MFT_ZONE);
+ rl2 = ntfs_cluster_alloc(vol, old_last_vcn, nr, lcn, MFT_ZONE,
+ TRUE);
if (likely(!IS_ERR(rl2)))
break;
if (PTR_ERR(rl2) != -ENOSPC || nr == min_nr) {
---
0.99.9