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fs/ntfs3: Add comments about cluster size

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This commit adds additional info about CONFIG_NTFS3_64BIT_CLUSTER

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov 2022-09-09 19:12:31 +03:00
parent f76349cf41
commit bd6ae049b7
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GPG Key ID: A9B0331F832407B6
3 changed files with 29 additions and 1 deletions
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2
fs/ntfs3/frecord.c
View File

@ -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;

4
fs/ntfs3/record.c
View File

@ -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)
{

24
fs/ntfs3/super.c
View File

@ -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>