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Subject[PATCH 11/52] CRED: Give the get_block() callback a credentials pointer
Date
Give the get_block() callback a credentials pointer.

Signed-off-by: David Howells <dhowells@redhat.com>
---

fs/block_dev.c | 6 ++++--
fs/buffer.c | 18 ++++++++++++------
fs/direct-io.c | 3 ++-
fs/ext3/inode.c | 7 ++++---
fs/fat/inode.c | 3 ++-
fs/mpage.c | 6 ++++--
include/linux/fs.h | 3 ++-
7 files changed, 30 insertions(+), 16 deletions(-)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 6339a30..1a51716 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -112,7 +112,8 @@ EXPORT_SYMBOL(sb_min_blocksize);

static int
blkdev_get_block(struct inode *inode, sector_t iblock,
- struct buffer_head *bh, int create)
+ struct buffer_head *bh, int create,
+ struct cred *cred)
{
if (iblock >= max_block(I_BDEV(inode))) {
if (create)
@@ -134,7 +135,8 @@ blkdev_get_block(struct inode *inode, sector_t iblock,

static int
blkdev_get_blocks(struct inode *inode, sector_t iblock,
- struct buffer_head *bh, int create)
+ struct buffer_head *bh, int create,
+ struct cred *cred)
{
sector_t end_block = max_block(I_BDEV(inode));
unsigned long max_blocks = bh->b_size >> inode->i_blkbits;
diff --git a/fs/buffer.c b/fs/buffer.c
index 75b51df..c5b2ebc 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1599,6 +1599,7 @@ EXPORT_SYMBOL(unmap_underlying_metadata);
static int __block_write_full_page(struct inode *inode, struct page *page,
get_block_t *get_block, struct writeback_control *wbc)
{
+ struct cred *cred = current->cred;
int err;
sector_t block;
sector_t last_block;
@@ -1647,7 +1648,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
set_buffer_uptodate(bh);
} else if (!buffer_mapped(bh) && buffer_dirty(bh)) {
WARN_ON(bh->b_size != blocksize);
- err = get_block(inode, block, bh, 1);
+ err = get_block(inode, block, bh, 1, cred);
if (err)
goto recover;
if (buffer_new(bh)) {
@@ -1760,6 +1761,7 @@ recover:
static int __block_prepare_write(struct inode *inode, struct page *page,
unsigned from, unsigned to, get_block_t *get_block)
{
+ struct cred *cred = current->cred;
unsigned block_start, block_end;
sector_t block;
int err = 0;
@@ -1793,7 +1795,7 @@ static int __block_prepare_write(struct inode *inode, struct page *page,
clear_buffer_new(bh);
if (!buffer_mapped(bh)) {
WARN_ON(bh->b_size != blocksize);
- err = get_block(inode, block, bh, 1);
+ err = get_block(inode, block, bh, 1, cred);
if (err)
break;
if (buffer_new(bh)) {
@@ -1917,6 +1919,7 @@ static int __block_commit_write(struct inode *inode, struct page *page,
*/
int block_read_full_page(struct page *page, get_block_t *get_block)
{
+ struct cred *cred = current->cred;
struct inode *inode = page->mapping->host;
sector_t iblock, lblock;
struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE];
@@ -1946,7 +1949,7 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
fully_mapped = 0;
if (iblock < lblock) {
WARN_ON(bh->b_size != blocksize);
- err = get_block(inode, iblock, bh, 0);
+ err = get_block(inode, iblock, bh, 0, cred);
if (err)
SetPageError(page);
}
@@ -2269,6 +2272,7 @@ static void end_buffer_read_nobh(struct buffer_head *bh, int uptodate)
int nobh_prepare_write(struct page *page, unsigned from, unsigned to,
get_block_t *get_block)
{
+ struct cred *cred = current->cred;
struct inode *inode = page->mapping->host;
const unsigned blkbits = inode->i_blkbits;
const unsigned blocksize = 1 << blkbits;
@@ -2306,7 +2310,7 @@ int nobh_prepare_write(struct page *page, unsigned from, unsigned to,
create = 0;
map_bh.b_size = blocksize;
ret = get_block(inode, block_in_file + block_in_page,
- &map_bh, create);
+ &map_bh, create, cred);
if (ret)
goto failed;
if (!buffer_mapped(&map_bh))
@@ -2511,6 +2515,7 @@ EXPORT_SYMBOL(nobh_truncate_page);
int block_truncate_page(struct address_space *mapping,
loff_t from, get_block_t *get_block)
{
+ struct cred *cred = current->cred;
pgoff_t index = from >> PAGE_CACHE_SHIFT;
unsigned offset = from & (PAGE_CACHE_SIZE-1);
unsigned blocksize;
@@ -2551,7 +2556,7 @@ int block_truncate_page(struct address_space *mapping,
err = 0;
if (!buffer_mapped(bh)) {
WARN_ON(bh->b_size != blocksize);
- err = get_block(inode, iblock, bh, 0);
+ err = get_block(inode, iblock, bh, 0, cred);
if (err)
goto unlock;
/* unmapped? It's a hole - nothing to do */
@@ -2625,12 +2630,13 @@ int block_write_full_page(struct page *page, get_block_t *get_block,
sector_t generic_block_bmap(struct address_space *mapping, sector_t block,
get_block_t *get_block)
{
+ struct cred *cred = current->cred;
struct buffer_head tmp;
struct inode *inode = mapping->host;
tmp.b_state = 0;
tmp.b_blocknr = 0;
tmp.b_size = 1 << inode->i_blkbits;
- get_block(inode, block, &tmp, 0);
+ get_block(inode, block, &tmp, 0, cred);
return tmp.b_blocknr;
}

diff --git a/fs/direct-io.c b/fs/direct-io.c
index b5928a7..dacd0e8 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -499,6 +499,7 @@ static int dio_bio_reap(struct dio *dio)
static int get_more_blocks(struct dio *dio)
{
int ret;
+ struct cred *cred = current->cred;
struct buffer_head *map_bh = &dio->map_bh;
sector_t fs_startblk; /* Into file, in filesystem-sized blocks */
unsigned long fs_count; /* Number of filesystem-sized blocks */
@@ -539,7 +540,7 @@ static int get_more_blocks(struct dio *dio)
* writes.
*/
ret = (*dio->get_block)(dio->inode, fs_startblk,
- map_bh, create);
+ map_bh, create, cred);
}
return ret;
}
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 57a2e74..a7ef05c 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -948,9 +948,9 @@ out:
#define DIO_CREDITS (EXT3_RESERVE_TRANS_BLOCKS + 32)

static int ext3_get_block(struct inode *inode, sector_t iblock,
- struct buffer_head *bh_result, int create)
+ struct buffer_head *bh_result, int create,
+ struct cred *cred)
{
- struct cred *cred = current->cred;
handle_t *handle = ext3_journal_current_handle();
int ret = 0;
unsigned max_blocks = bh_result->b_size >> inode->i_blkbits;
@@ -1769,6 +1769,7 @@ void ext3_set_aops(struct inode *inode)
static int ext3_block_truncate_page(handle_t *handle, struct page *page,
struct address_space *mapping, loff_t from)
{
+ struct cred *cred = current->cred;
ext3_fsblk_t index = from >> PAGE_CACHE_SHIFT;
unsigned offset = from & (PAGE_CACHE_SIZE-1);
unsigned blocksize, iblock, length, pos;
@@ -1811,7 +1812,7 @@ static int ext3_block_truncate_page(handle_t *handle, struct page *page,

if (!buffer_mapped(bh)) {
BUFFER_TRACE(bh, "unmapped");
- ext3_get_block(inode, iblock, bh, 0);
+ ext3_get_block(inode, iblock, bh, 0, cred);
/* unmapped? It's a hole - nothing to do */
if (!buffer_mapped(bh)) {
BUFFER_TRACE(bh, "still unmapped");
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 9ae2e9f..43c6f4a 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -106,7 +106,8 @@ static inline int __fat_get_block(struct inode *inode, sector_t iblock,
}

static int fat_get_block(struct inode *inode, sector_t iblock,
- struct buffer_head *bh_result, int create)
+ struct buffer_head *bh_result, int create,
+ struct cred *cred)
{
struct super_block *sb = inode->i_sb;
unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
diff --git a/fs/mpage.c b/fs/mpage.c
index b1c3e58..7fc2dce 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -169,6 +169,7 @@ do_mpage_readpage(struct bio *bio, struct page *page, unsigned nr_pages,
sector_t *last_block_in_bio, struct buffer_head *map_bh,
unsigned long *first_logical_block, get_block_t get_block)
{
+ struct cred *cred = current->cred;
struct inode *inode = page->mapping->host;
const unsigned blkbits = inode->i_blkbits;
const unsigned blocks_per_page = PAGE_CACHE_SIZE >> blkbits;
@@ -229,7 +230,7 @@ do_mpage_readpage(struct bio *bio, struct page *page, unsigned nr_pages,

if (block_in_file < last_block) {
map_bh->b_size = (last_block-block_in_file) << blkbits;
- if (get_block(inode, block_in_file, map_bh, 0))
+ if (get_block(inode, block_in_file, map_bh, 0, cred))
goto confused;
*first_logical_block = block_in_file;
}
@@ -456,6 +457,7 @@ struct mpage_data {
static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
void *data)
{
+ struct cred *cred = current->cred;
struct mpage_data *mpd = data;
struct bio *bio = mpd->bio;
struct address_space *mapping = page->mapping;
@@ -538,7 +540,7 @@ static int __mpage_writepage(struct page *page, struct writeback_control *wbc,

map_bh.b_state = 0;
map_bh.b_size = 1 << blkbits;
- if (mpd->get_block(inode, block_in_file, &map_bh, 1))
+ if (mpd->get_block(inode, block_in_file, &map_bh, 1, cred))
goto confused;
if (buffer_new(&map_bh))
unmap_underlying_metadata(map_bh.b_bdev,
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1be33c8..6d9bfc4 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -309,7 +309,8 @@ extern void __init files_init(unsigned long);

struct buffer_head;
typedef int (get_block_t)(struct inode *inode, sector_t iblock,
- struct buffer_head *bh_result, int create);
+ struct buffer_head *bh_result, int create,
+ struct cred *cred);
typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
ssize_t bytes, void *private);

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