From: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
To: <ntfs3@lists.linux.dev>
Cc: <linux-kernel@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>
Subject: [PATCH 1/3] fs/ntfs3: Add comments about cluster size
Date: Mon, 12 Sep 2022 19:39:19 +0300 [thread overview]
Message-ID: <c1fd8894-aaba-c5ff-57f2-480c480880f7@paragon-software.com> (raw)
In-Reply-To: <59960918-0adb-6d53-2d77-8172e666bf40@paragon-software.com>
This commit adds additional info about CONFIG_NTFS3_64BIT_CLUSTER
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
---
fs/ntfs3/frecord.c | 2 +-
fs/ntfs3/record.c | 4 ++++
fs/ntfs3/super.c | 24 +++++++++++++++++++++++++++
3 files changed, 29 insertions(+), 1 deletion(-)
diff --git a/fs/ntfs3/frecord.c b/fs/ntfs3/frecord.c
index 381a38a06ec2..b752d83cf460 100644
--- a/fs/ntfs3/frecord.c
+++ b/fs/ntfs3/frecord.c
@@ -557,7 +557,7 @@ static int ni_repack(struct ntfs_inode *ni)
}
if (!mi_p) {
- /* Do not try if not enogh free space. */
+ /* Do not try if not enough free space. */
if (le32_to_cpu(mi->mrec->used) + 8 >= rs)
continue;
diff --git a/fs/ntfs3/record.c b/fs/ntfs3/record.c
index 7d2fac5ee215..c8741cfa421f 100644
--- a/fs/ntfs3/record.c
+++ b/fs/ntfs3/record.c
@@ -537,6 +537,10 @@ bool mi_resize_attr(struct mft_inode *mi, struct ATTRIB *attr, int bytes)
return true;
}
+/*
+ * Pack runs in MFT record.
+ * If failed record is not changed.
+ */
int mi_pack_runs(struct mft_inode *mi, struct ATTRIB *attr,
struct runs_tree *run, CLST len)
{
diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index 47012c9bf505..86ff55133faf 100644
--- a/fs/ntfs3/super.c
+++ b/fs/ntfs3/super.c
@@ -21,6 +21,30 @@
* https://docs.microsoft.com/en-us/windows/wsl/file-permissions
* It stores uid/gid/mode/dev in xattr
*
+ * ntfs allows up to 2^64 clusters per volume.
+ * It means you should use 64 bits lcn to operate with ntfs.
+ * Implementation of ntfs.sys uses only 32 bits lcn.
+ * Default ntfs3 uses 32 bits lcn too.
+ * ntfs3 built with CONFIG_NTFS3_64BIT_CLUSTER (ntfs3_64) uses 64 bits per lcn.
+ *
+ *
+ * ntfs limits, cluster size is 4K (2^12)
+ * -----------------------------------------------------------------------------
+ * | Volume size | Clusters | ntfs.sys | ntfs3 | ntfs3_64 | mkntfs | chkdsk |
+ * -----------------------------------------------------------------------------
+ * | < 16T, 2^44 | < 2^32 | yes | yes | yes | yes | yes |
+ * | > 16T, 2^44 | > 2^32 | no | no | yes | yes | yes |
+ * ----------------------------------------------------------|------------------
+ *
+ * To mount large volumes as ntfs one should use large cluster size (up to 2M)
+ * The maximum volume size in this case is 2^32 * 2^21 = 2^53 = 8P
+ *
+ * ntfs limits, cluster size is 2M (2^31)
+ * -----------------------------------------------------------------------------
+ * | < 8P, 2^54 | < 2^32 | yes | yes | yes | yes | yes |
+ * | > 8P, 2^54 | > 2^32 | no | no | yes | yes | yes |
+ * ----------------------------------------------------------|------------------
+ *
*/
#include <linux/blkdev.h>
--
2.37.0
next prev parent reply other threads:[~2022-09-12 16:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-12 16:37 [PATCH 0/3] fs/ntfs3: Refactoring and hidedotfiles option Konstantin Komarov
2022-09-12 16:39 ` Konstantin Komarov [this message]
2022-09-12 16:40 ` [PATCH 2/3] fs/ntfs3: Add " Konstantin Komarov
2022-10-03 22:51 ` Daniel Pinto
2022-09-12 16:40 ` [PATCH 3/3] fs/ntfs3: Change destroy_inode to free_inode Konstantin Komarov
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