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-rw-r--r--fs/ntfs/ChangeLog7
-rw-r--r--fs/ntfs/compress.c46
-rw-r--r--fs/ntfs/inode.c1
-rw-r--r--fs/ntfs/inode.h1
4 files changed, 37 insertions, 18 deletions
diff --git a/fs/ntfs/ChangeLog b/fs/ntfs/ChangeLog
index 6d2a99c13d30..97c4fe932046 100644
--- a/fs/ntfs/ChangeLog
+++ b/fs/ntfs/ChangeLog
@@ -34,6 +34,13 @@ ToDo/Notes:
- Use i_size_read() once and then use the cached value in
fs/ntfs/lcnalloc.c::ntfs_cluster_alloc().
- Use i_size_read() in fs/ntfs/file.c::ntfs_file_open().
+ - Add size_lock to the ntfs_inode structure. This is an rw spinlock
+ and it locks against access to the inode sizes. Note, ->size_lock
+ is also accessed from irq context so you must use the _irqsave and
+ _irqrestore lock and unlock functions, respectively.
+ - Use i_size_read() in fs/ntfs/compress.c at the start of the read and
+ use the cached value afterwards. Cache the initialized_size in the
+ same way and protect access to the two sizes using the size_lock.
2.1.22 - Many bug and race fixes and error handling improvements.
diff --git a/fs/ntfs/compress.c b/fs/ntfs/compress.c
index ee5ae706f861..6d265cfd49aa 100644
--- a/fs/ntfs/compress.c
+++ b/fs/ntfs/compress.c
@@ -96,13 +96,14 @@ void free_compression_buffers(void)
/**
* zero_partial_compressed_page - zero out of bounds compressed page region
*/
-static void zero_partial_compressed_page(ntfs_inode *ni, struct page *page)
+static void zero_partial_compressed_page(struct page *page,
+ const s64 initialized_size)
{
u8 *kp = page_address(page);
unsigned int kp_ofs;
ntfs_debug("Zeroing page region outside initialized size.");
- if (((s64)page->index << PAGE_CACHE_SHIFT) >= ni->initialized_size) {
+ if (((s64)page->index << PAGE_CACHE_SHIFT) >= initialized_size) {
/*
* FIXME: Using clear_page() will become wrong when we get
* PAGE_CACHE_SIZE != PAGE_SIZE but for now there is no problem.
@@ -110,7 +111,7 @@ static void zero_partial_compressed_page(ntfs_inode *ni, struct page *page)
clear_page(kp);
return;
}
- kp_ofs = ni->initialized_size & ~PAGE_CACHE_MASK;
+ kp_ofs = initialized_size & ~PAGE_CACHE_MASK;
memset(kp + kp_ofs, 0, PAGE_CACHE_SIZE - kp_ofs);
return;
}
@@ -118,12 +119,12 @@ static void zero_partial_compressed_page(ntfs_inode *ni, struct page *page)
/**
* handle_bounds_compressed_page - test for&handle out of bounds compressed page
*/
-static inline void handle_bounds_compressed_page(ntfs_inode *ni,
- struct page *page)
+static inline void handle_bounds_compressed_page(struct page *page,
+ const loff_t i_size, const s64 initialized_size)
{
- if ((page->index >= (ni->initialized_size >> PAGE_CACHE_SHIFT)) &&
- (ni->initialized_size < VFS_I(ni)->i_size))
- zero_partial_compressed_page(ni, page);
+ if ((page->index >= (initialized_size >> PAGE_CACHE_SHIFT)) &&
+ (initialized_size < i_size))
+ zero_partial_compressed_page(page, initialized_size);
return;
}
@@ -138,6 +139,8 @@ static inline void handle_bounds_compressed_page(ntfs_inode *ni,
* @xpage_done: set to 1 if xpage was completed successfully (IN/OUT)
* @cb_start: compression block to decompress (IN)
* @cb_size: size of compression block @cb_start in bytes (IN)
+ * @i_size: file size when we started the read (IN)
+ * @initialized_size: initialized file size when we started the read (IN)
*
* The caller must have disabled preemption. ntfs_decompress() reenables it when
* the critical section is finished.
@@ -165,7 +168,8 @@ static inline void handle_bounds_compressed_page(ntfs_inode *ni,
static int ntfs_decompress(struct page *dest_pages[], int *dest_index,
int *dest_ofs, const int dest_max_index, const int dest_max_ofs,
const int xpage, char *xpage_done, u8 *const cb_start,
- const u32 cb_size)
+ const u32 cb_size, const loff_t i_size,
+ const s64 initialized_size)
{
/*
* Pointers into the compressed data, i.e. the compression block (cb),
@@ -219,9 +223,6 @@ return_error:
spin_unlock(&ntfs_cb_lock);
/* Second stage: finalize completed pages. */
if (nr_completed_pages > 0) {
- struct page *page = dest_pages[completed_pages[0]];
- ntfs_inode *ni = NTFS_I(page->mapping->host);
-
for (i = 0; i < nr_completed_pages; i++) {
int di = completed_pages[i];
@@ -230,7 +231,8 @@ return_error:
* If we are outside the initialized size, zero
* the out of bounds page range.
*/
- handle_bounds_compressed_page(ni, dp);
+ handle_bounds_compressed_page(dp, i_size,
+ initialized_size);
flush_dcache_page(dp);
kunmap(dp);
SetPageUptodate(dp);
@@ -478,12 +480,14 @@ return_overflow:
*/
int ntfs_read_compressed_block(struct page *page)
{
+ loff_t i_size;
+ s64 initialized_size;
struct address_space *mapping = page->mapping;
ntfs_inode *ni = NTFS_I(mapping->host);
ntfs_volume *vol = ni->vol;
struct super_block *sb = vol->sb;
runlist_element *rl;
- unsigned long block_size = sb->s_blocksize;
+ unsigned long flags, block_size = sb->s_blocksize;
unsigned char block_size_bits = sb->s_blocksize_bits;
u8 *cb, *cb_pos, *cb_end;
struct buffer_head **bhs;
@@ -552,8 +556,12 @@ int ntfs_read_compressed_block(struct page *page)
* The remaining pages need to be allocated and inserted into the page
* cache, alignment guarantees keep all the below much simpler. (-8
*/
- max_page = ((VFS_I(ni)->i_size + PAGE_CACHE_SIZE - 1) >>
- PAGE_CACHE_SHIFT) - offset;
+ read_lock_irqsave(&ni->size_lock, flags);
+ i_size = i_size_read(VFS_I(ni));
+ initialized_size = ni->initialized_size;
+ read_unlock_irqrestore(&ni->size_lock, flags);
+ max_page = ((i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
+ offset;
if (nr_pages < max_page)
max_page = nr_pages;
for (i = 0; i < max_page; i++, offset++) {
@@ -824,7 +832,8 @@ lock_retry_remap:
* If we are outside the initialized size, zero
* the out of bounds page range.
*/
- handle_bounds_compressed_page(ni, page);
+ handle_bounds_compressed_page(page, i_size,
+ initialized_size);
flush_dcache_page(page);
kunmap(page);
SetPageUptodate(page);
@@ -847,7 +856,8 @@ lock_retry_remap:
ntfs_debug("Found compressed compression block.");
err = ntfs_decompress(pages, &cur_page, &cur_ofs,
cb_max_page, cb_max_ofs, xpage, &xpage_done,
- cb_pos, cb_size - (cb_pos - cb));
+ cb_pos, cb_size - (cb_pos - cb), i_size,
+ initialized_size);
/*
* We can sleep from now on, lock already dropped by
* ntfs_decompress().
diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index 31840ba0b38c..a02d8d9f0439 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -376,6 +376,7 @@ static void ntfs_destroy_extent_inode(ntfs_inode *ni)
void __ntfs_init_inode(struct super_block *sb, ntfs_inode *ni)
{
ntfs_debug("Entering.");
+ rwlock_init(&ni->size_lock);
ni->initialized_size = ni->allocated_size = 0;
ni->seq_no = 0;
atomic_set(&ni->count, 1);
diff --git a/fs/ntfs/inode.h b/fs/ntfs/inode.h
index 99580455f2ed..56b2d6ec33f7 100644
--- a/fs/ntfs/inode.h
+++ b/fs/ntfs/inode.h
@@ -44,6 +44,7 @@ typedef struct _ntfs_inode ntfs_inode;
* fields already provided in the VFS inode.
*/
struct _ntfs_inode {
+ rwlock_t size_lock; /* Lock serializing access to inode sizes. */
s64 initialized_size; /* Copy from the attribute record. */
s64 allocated_size; /* Copy from the attribute record. */
unsigned long state; /* NTFS specific flags describing this inode.
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 09:33:53 +0000