mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-08 01:08:03 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
229
fs/reiserfs/resize.c
Normal file
229
fs/reiserfs/resize.c
Normal file
|
|
@ -0,0 +1,229 @@
|
|||
/*
|
||||
* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
|
||||
*/
|
||||
|
||||
/*
|
||||
* Written by Alexander Zarochentcev.
|
||||
*
|
||||
* The kernel part of the (on-line) reiserfs resizer.
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/errno.h>
|
||||
#include "reiserfs.h"
|
||||
#include <linux/buffer_head.h>
|
||||
|
||||
int reiserfs_resize(struct super_block *s, unsigned long block_count_new)
|
||||
{
|
||||
int err = 0;
|
||||
struct reiserfs_super_block *sb;
|
||||
struct reiserfs_bitmap_info *bitmap;
|
||||
struct reiserfs_bitmap_info *info;
|
||||
struct reiserfs_bitmap_info *old_bitmap = SB_AP_BITMAP(s);
|
||||
struct buffer_head *bh;
|
||||
struct reiserfs_transaction_handle th;
|
||||
unsigned int bmap_nr_new, bmap_nr;
|
||||
unsigned int block_r_new, block_r;
|
||||
|
||||
struct reiserfs_list_bitmap *jb;
|
||||
struct reiserfs_list_bitmap jbitmap[JOURNAL_NUM_BITMAPS];
|
||||
|
||||
unsigned long int block_count, free_blocks;
|
||||
int i;
|
||||
int copy_size;
|
||||
int depth;
|
||||
|
||||
sb = SB_DISK_SUPER_BLOCK(s);
|
||||
|
||||
if (SB_BLOCK_COUNT(s) >= block_count_new) {
|
||||
printk("can\'t shrink filesystem on-line\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* check the device size */
|
||||
depth = reiserfs_write_unlock_nested(s);
|
||||
bh = sb_bread(s, block_count_new - 1);
|
||||
reiserfs_write_lock_nested(s, depth);
|
||||
if (!bh) {
|
||||
printk("reiserfs_resize: can\'t read last block\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
bforget(bh);
|
||||
|
||||
/*
|
||||
* old disk layout detection; those partitions can be mounted, but
|
||||
* cannot be resized
|
||||
*/
|
||||
if (SB_BUFFER_WITH_SB(s)->b_blocknr * SB_BUFFER_WITH_SB(s)->b_size
|
||||
!= REISERFS_DISK_OFFSET_IN_BYTES) {
|
||||
printk
|
||||
("reiserfs_resize: unable to resize a reiserfs without distributed bitmap (fs version < 3.5.12)\n");
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
|
||||
/* count used bits in last bitmap block */
|
||||
block_r = SB_BLOCK_COUNT(s) -
|
||||
(reiserfs_bmap_count(s) - 1) * s->s_blocksize * 8;
|
||||
|
||||
/* count bitmap blocks in new fs */
|
||||
bmap_nr_new = block_count_new / (s->s_blocksize * 8);
|
||||
block_r_new = block_count_new - bmap_nr_new * s->s_blocksize * 8;
|
||||
if (block_r_new)
|
||||
bmap_nr_new++;
|
||||
else
|
||||
block_r_new = s->s_blocksize * 8;
|
||||
|
||||
/* save old values */
|
||||
block_count = SB_BLOCK_COUNT(s);
|
||||
bmap_nr = reiserfs_bmap_count(s);
|
||||
|
||||
/* resizing of reiserfs bitmaps (journal and real), if needed */
|
||||
if (bmap_nr_new > bmap_nr) {
|
||||
/* reallocate journal bitmaps */
|
||||
if (reiserfs_allocate_list_bitmaps(s, jbitmap, bmap_nr_new) < 0) {
|
||||
printk
|
||||
("reiserfs_resize: unable to allocate memory for journal bitmaps\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
/*
|
||||
* the new journal bitmaps are zero filled, now we copy i
|
||||
* the bitmap node pointers from the old journal bitmap
|
||||
* structs, and then transfer the new data structures
|
||||
* into the journal struct.
|
||||
*
|
||||
* using the copy_size var below allows this code to work for
|
||||
* both shrinking and expanding the FS.
|
||||
*/
|
||||
copy_size = bmap_nr_new < bmap_nr ? bmap_nr_new : bmap_nr;
|
||||
copy_size =
|
||||
copy_size * sizeof(struct reiserfs_list_bitmap_node *);
|
||||
for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
|
||||
struct reiserfs_bitmap_node **node_tmp;
|
||||
jb = SB_JOURNAL(s)->j_list_bitmap + i;
|
||||
memcpy(jbitmap[i].bitmaps, jb->bitmaps, copy_size);
|
||||
|
||||
/*
|
||||
* just in case vfree schedules on us, copy the new
|
||||
* pointer into the journal struct before freeing the
|
||||
* old one
|
||||
*/
|
||||
node_tmp = jb->bitmaps;
|
||||
jb->bitmaps = jbitmap[i].bitmaps;
|
||||
vfree(node_tmp);
|
||||
}
|
||||
|
||||
/*
|
||||
* allocate additional bitmap blocks, reallocate
|
||||
* array of bitmap block pointers
|
||||
*/
|
||||
bitmap =
|
||||
vzalloc(sizeof(struct reiserfs_bitmap_info) * bmap_nr_new);
|
||||
if (!bitmap) {
|
||||
/*
|
||||
* Journal bitmaps are still supersized, but the
|
||||
* memory isn't leaked, so I guess it's ok
|
||||
*/
|
||||
printk("reiserfs_resize: unable to allocate memory.\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
for (i = 0; i < bmap_nr; i++)
|
||||
bitmap[i] = old_bitmap[i];
|
||||
|
||||
/*
|
||||
* This doesn't go through the journal, but it doesn't have to.
|
||||
* The changes are still atomic: We're synced up when the
|
||||
* journal transaction begins, and the new bitmaps don't
|
||||
* matter if the transaction fails.
|
||||
*/
|
||||
for (i = bmap_nr; i < bmap_nr_new; i++) {
|
||||
int depth;
|
||||
/*
|
||||
* don't use read_bitmap_block since it will cache
|
||||
* the uninitialized bitmap
|
||||
*/
|
||||
depth = reiserfs_write_unlock_nested(s);
|
||||
bh = sb_bread(s, i * s->s_blocksize * 8);
|
||||
reiserfs_write_lock_nested(s, depth);
|
||||
if (!bh) {
|
||||
vfree(bitmap);
|
||||
return -EIO;
|
||||
}
|
||||
memset(bh->b_data, 0, sb_blocksize(sb));
|
||||
reiserfs_set_le_bit(0, bh->b_data);
|
||||
reiserfs_cache_bitmap_metadata(s, bh, bitmap + i);
|
||||
|
||||
set_buffer_uptodate(bh);
|
||||
mark_buffer_dirty(bh);
|
||||
depth = reiserfs_write_unlock_nested(s);
|
||||
sync_dirty_buffer(bh);
|
||||
reiserfs_write_lock_nested(s, depth);
|
||||
/* update bitmap_info stuff */
|
||||
bitmap[i].free_count = sb_blocksize(sb) * 8 - 1;
|
||||
brelse(bh);
|
||||
}
|
||||
/* free old bitmap blocks array */
|
||||
SB_AP_BITMAP(s) = bitmap;
|
||||
vfree(old_bitmap);
|
||||
}
|
||||
|
||||
/*
|
||||
* begin transaction, if there was an error, it's fine. Yes, we have
|
||||
* incorrect bitmaps now, but none of it is ever going to touch the
|
||||
* disk anyway.
|
||||
*/
|
||||
err = journal_begin(&th, s, 10);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
/* Extend old last bitmap block - new blocks have been made available */
|
||||
info = SB_AP_BITMAP(s) + bmap_nr - 1;
|
||||
bh = reiserfs_read_bitmap_block(s, bmap_nr - 1);
|
||||
if (!bh) {
|
||||
int jerr = journal_end(&th);
|
||||
if (jerr)
|
||||
return jerr;
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
reiserfs_prepare_for_journal(s, bh, 1);
|
||||
for (i = block_r; i < s->s_blocksize * 8; i++)
|
||||
reiserfs_clear_le_bit(i, bh->b_data);
|
||||
info->free_count += s->s_blocksize * 8 - block_r;
|
||||
|
||||
journal_mark_dirty(&th, bh);
|
||||
brelse(bh);
|
||||
|
||||
/* Correct new last bitmap block - It may not be full */
|
||||
info = SB_AP_BITMAP(s) + bmap_nr_new - 1;
|
||||
bh = reiserfs_read_bitmap_block(s, bmap_nr_new - 1);
|
||||
if (!bh) {
|
||||
int jerr = journal_end(&th);
|
||||
if (jerr)
|
||||
return jerr;
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
reiserfs_prepare_for_journal(s, bh, 1);
|
||||
for (i = block_r_new; i < s->s_blocksize * 8; i++)
|
||||
reiserfs_set_le_bit(i, bh->b_data);
|
||||
journal_mark_dirty(&th, bh);
|
||||
brelse(bh);
|
||||
|
||||
info->free_count -= s->s_blocksize * 8 - block_r_new;
|
||||
/* update super */
|
||||
reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
|
||||
free_blocks = SB_FREE_BLOCKS(s);
|
||||
PUT_SB_FREE_BLOCKS(s,
|
||||
free_blocks + (block_count_new - block_count -
|
||||
(bmap_nr_new - bmap_nr)));
|
||||
PUT_SB_BLOCK_COUNT(s, block_count_new);
|
||||
PUT_SB_BMAP_NR(s, bmap_would_wrap(bmap_nr_new) ? : bmap_nr_new);
|
||||
|
||||
journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
|
||||
|
||||
SB_JOURNAL(s)->j_must_wait = 1;
|
||||
return journal_end(&th);
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue