mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-27 06:04:23 +08:00
NTFS: - Use i_size_read() in fs/ntfs/super.c once and then use the cached
value afterwards. Cache the initialized_size in the same way and
protect access to the two sizes using the size_lock.
- Minor optimization to fs/ntfs/super.c::ntfs_statfs() and its helpers.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
This commit is contained in:
Anton Altaparmakov
parent
206f9f35b2
commit
218357ff1b
@ -43,6 +43,10 @@ ToDo/Notes:
|
||||
same way and protect access to the two sizes using the size_lock.
|
||||
- Use i_size_read() in fs/ntfs/dir.c once and then use the cached
|
||||
value afterwards.
|
||||
- Use i_size_read() in fs/ntfs/super.c once and then use the cached
|
||||
value afterwards. Cache the initialized_size in the same way and
|
||||
protect access to the two sizes using the size_lock.
|
||||
- Minor optimization to fs/ntfs/super.c::ntfs_statfs() and its helpers.
|
||||
|
||||
2.1.22 - Many bug and race fixes and error handling improvements.
|
||||
|
||||
|
||||
102
fs/ntfs/super.c
102
fs/ntfs/super.c
@ -990,12 +990,12 @@ static BOOL load_and_init_mft_mirror(ntfs_volume *vol)
|
||||
*/
|
||||
static BOOL check_mft_mirror(ntfs_volume *vol)
|
||||
{
|
||||
unsigned long index;
|
||||
struct super_block *sb = vol->sb;
|
||||
ntfs_inode *mirr_ni;
|
||||
struct page *mft_page, *mirr_page;
|
||||
u8 *kmft, *kmirr;
|
||||
runlist_element *rl, rl2[2];
|
||||
pgoff_t index;
|
||||
int mrecs_per_page, i;
|
||||
|
||||
ntfs_debug("Entering.");
|
||||
@ -1205,10 +1205,11 @@ static BOOL load_and_init_quota(ntfs_volume *vol)
|
||||
*/
|
||||
static BOOL load_and_init_attrdef(ntfs_volume *vol)
|
||||
{
|
||||
loff_t i_size;
|
||||
struct super_block *sb = vol->sb;
|
||||
struct inode *ino;
|
||||
struct page *page;
|
||||
unsigned long index, max_index;
|
||||
pgoff_t index, max_index;
|
||||
unsigned int size;
|
||||
|
||||
ntfs_debug("Entering.");
|
||||
@ -1220,13 +1221,14 @@ static BOOL load_and_init_attrdef(ntfs_volume *vol)
|
||||
goto failed;
|
||||
}
|
||||
/* The size of FILE_AttrDef must be above 0 and fit inside 31 bits. */
|
||||
if (!ino->i_size || ino->i_size > 0x7fffffff)
|
||||
i_size = i_size_read(ino);
|
||||
if (i_size <= 0 || i_size > 0x7fffffff)
|
||||
goto iput_failed;
|
||||
vol->attrdef = (ATTR_DEF*)ntfs_malloc_nofs(ino->i_size);
|
||||
vol->attrdef = (ATTR_DEF*)ntfs_malloc_nofs(i_size);
|
||||
if (!vol->attrdef)
|
||||
goto iput_failed;
|
||||
index = 0;
|
||||
max_index = ino->i_size >> PAGE_CACHE_SHIFT;
|
||||
max_index = i_size >> PAGE_CACHE_SHIFT;
|
||||
size = PAGE_CACHE_SIZE;
|
||||
while (index < max_index) {
|
||||
/* Read the attrdef table and copy it into the linear buffer. */
|
||||
@ -1239,12 +1241,12 @@ read_partial_attrdef_page:
|
||||
ntfs_unmap_page(page);
|
||||
};
|
||||
if (size == PAGE_CACHE_SIZE) {
|
||||
size = ino->i_size & ~PAGE_CACHE_MASK;
|
||||
size = i_size & ~PAGE_CACHE_MASK;
|
||||
if (size)
|
||||
goto read_partial_attrdef_page;
|
||||
}
|
||||
vol->attrdef_size = ino->i_size;
|
||||
ntfs_debug("Read %llu bytes from $AttrDef.", ino->i_size);
|
||||
vol->attrdef_size = i_size;
|
||||
ntfs_debug("Read %llu bytes from $AttrDef.", i_size);
|
||||
iput(ino);
|
||||
return TRUE;
|
||||
free_iput_failed:
|
||||
@ -1267,10 +1269,11 @@ failed:
|
||||
*/
|
||||
static BOOL load_and_init_upcase(ntfs_volume *vol)
|
||||
{
|
||||
loff_t i_size;
|
||||
struct super_block *sb = vol->sb;
|
||||
struct inode *ino;
|
||||
struct page *page;
|
||||
unsigned long index, max_index;
|
||||
pgoff_t index, max_index;
|
||||
unsigned int size;
|
||||
int i, max;
|
||||
|
||||
@ -1286,14 +1289,15 @@ static BOOL load_and_init_upcase(ntfs_volume *vol)
|
||||
* The upcase size must not be above 64k Unicode characters, must not
|
||||
* be zero and must be a multiple of sizeof(ntfschar).
|
||||
*/
|
||||
if (!ino->i_size || ino->i_size & (sizeof(ntfschar) - 1) ||
|
||||
ino->i_size > 64ULL * 1024 * sizeof(ntfschar))
|
||||
i_size = i_size_read(ino);
|
||||
if (!i_size || i_size & (sizeof(ntfschar) - 1) ||
|
||||
i_size > 64ULL * 1024 * sizeof(ntfschar))
|
||||
goto iput_upcase_failed;
|
||||
vol->upcase = (ntfschar*)ntfs_malloc_nofs(ino->i_size);
|
||||
vol->upcase = (ntfschar*)ntfs_malloc_nofs(i_size);
|
||||
if (!vol->upcase)
|
||||
goto iput_upcase_failed;
|
||||
index = 0;
|
||||
max_index = ino->i_size >> PAGE_CACHE_SHIFT;
|
||||
max_index = i_size >> PAGE_CACHE_SHIFT;
|
||||
size = PAGE_CACHE_SIZE;
|
||||
while (index < max_index) {
|
||||
/* Read the upcase table and copy it into the linear buffer. */
|
||||
@ -1306,13 +1310,13 @@ read_partial_upcase_page:
|
||||
ntfs_unmap_page(page);
|
||||
};
|
||||
if (size == PAGE_CACHE_SIZE) {
|
||||
size = ino->i_size & ~PAGE_CACHE_MASK;
|
||||
size = i_size & ~PAGE_CACHE_MASK;
|
||||
if (size)
|
||||
goto read_partial_upcase_page;
|
||||
}
|
||||
vol->upcase_len = ino->i_size >> UCHAR_T_SIZE_BITS;
|
||||
vol->upcase_len = i_size >> UCHAR_T_SIZE_BITS;
|
||||
ntfs_debug("Read %llu bytes from $UpCase (expected %zu bytes).",
|
||||
ino->i_size, 64 * 1024 * sizeof(ntfschar));
|
||||
i_size, 64 * 1024 * sizeof(ntfschar));
|
||||
iput(ino);
|
||||
down(&ntfs_lock);
|
||||
if (!default_upcase) {
|
||||
@ -1435,7 +1439,7 @@ static BOOL load_system_files(ntfs_volume *vol)
|
||||
iput(vol->lcnbmp_ino);
|
||||
goto bitmap_failed;
|
||||
}
|
||||
if ((vol->nr_clusters + 7) >> 3 > vol->lcnbmp_ino->i_size) {
|
||||
if ((vol->nr_clusters + 7) >> 3 > i_size_read(vol->lcnbmp_ino)) {
|
||||
iput(vol->lcnbmp_ino);
|
||||
bitmap_failed:
|
||||
ntfs_error(sb, "Failed to load $Bitmap.");
|
||||
@ -1959,8 +1963,7 @@ static s64 get_nr_free_clusters(ntfs_volume *vol)
|
||||
struct address_space *mapping = vol->lcnbmp_ino->i_mapping;
|
||||
filler_t *readpage = (filler_t*)mapping->a_ops->readpage;
|
||||
struct page *page;
|
||||
unsigned long index, max_index;
|
||||
unsigned int max_size;
|
||||
pgoff_t index, max_index;
|
||||
|
||||
ntfs_debug("Entering.");
|
||||
/* Serialize accesses to the cluster bitmap. */
|
||||
@ -1972,11 +1975,10 @@ static s64 get_nr_free_clusters(ntfs_volume *vol)
|
||||
*/
|
||||
max_index = (((vol->nr_clusters + 7) >> 3) + PAGE_CACHE_SIZE - 1) >>
|
||||
PAGE_CACHE_SHIFT;
|
||||
/* Use multiples of 4 bytes. */
|
||||
max_size = PAGE_CACHE_SIZE >> 2;
|
||||
ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%x.",
|
||||
max_index, max_size);
|
||||
for (index = 0UL; index < max_index; index++) {
|
||||
/* Use multiples of 4 bytes, thus max_size is PAGE_CACHE_SIZE / 4. */
|
||||
ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%lx.",
|
||||
max_index, PAGE_CACHE_SIZE / 4);
|
||||
for (index = 0; index < max_index; index++) {
|
||||
unsigned int i;
|
||||
/*
|
||||
* Read the page from page cache, getting it from backing store
|
||||
@ -2008,7 +2010,7 @@ static s64 get_nr_free_clusters(ntfs_volume *vol)
|
||||
* the result as all out of range bytes are set to zero by
|
||||
* ntfs_readpage().
|
||||
*/
|
||||
for (i = 0; i < max_size; i++)
|
||||
for (i = 0; i < PAGE_CACHE_SIZE / 4; i++)
|
||||
nr_free -= (s64)hweight32(kaddr[i]);
|
||||
kunmap_atomic(kaddr, KM_USER0);
|
||||
page_cache_release(page);
|
||||
@ -2031,6 +2033,8 @@ static s64 get_nr_free_clusters(ntfs_volume *vol)
|
||||
/**
|
||||
* __get_nr_free_mft_records - return the number of free inodes on a volume
|
||||
* @vol: ntfs volume for which to obtain free inode count
|
||||
* @nr_free: number of mft records in file system
|
||||
* @max_index: maximum number of pages containing set bits
|
||||
*
|
||||
* Calculate the number of free mft records (inodes) on the mounted NTFS
|
||||
* volume @vol. We actually calculate the number of mft records in use instead
|
||||
@ -2043,32 +2047,20 @@ static s64 get_nr_free_clusters(ntfs_volume *vol)
|
||||
*
|
||||
* NOTE: Caller must hold mftbmp_lock rw_semaphore for reading or writing.
|
||||
*/
|
||||
static unsigned long __get_nr_free_mft_records(ntfs_volume *vol)
|
||||
static unsigned long __get_nr_free_mft_records(ntfs_volume *vol,
|
||||
s64 nr_free, const pgoff_t max_index)
|
||||
{
|
||||
s64 nr_free;
|
||||
u32 *kaddr;
|
||||
struct address_space *mapping = vol->mftbmp_ino->i_mapping;
|
||||
filler_t *readpage = (filler_t*)mapping->a_ops->readpage;
|
||||
struct page *page;
|
||||
unsigned long index, max_index;
|
||||
unsigned int max_size;
|
||||
pgoff_t index;
|
||||
|
||||
ntfs_debug("Entering.");
|
||||
/* Number of mft records in file system (at this point in time). */
|
||||
nr_free = vol->mft_ino->i_size >> vol->mft_record_size_bits;
|
||||
/*
|
||||
* Convert the maximum number of set bits into bytes rounded up, then
|
||||
* convert into multiples of PAGE_CACHE_SIZE, rounding up so that if we
|
||||
* have one full and one partial page max_index = 2.
|
||||
*/
|
||||
max_index = ((((NTFS_I(vol->mft_ino)->initialized_size >>
|
||||
vol->mft_record_size_bits) + 7) >> 3) +
|
||||
PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
|
||||
/* Use multiples of 4 bytes. */
|
||||
max_size = PAGE_CACHE_SIZE >> 2;
|
||||
/* Use multiples of 4 bytes, thus max_size is PAGE_CACHE_SIZE / 4. */
|
||||
ntfs_debug("Reading $MFT/$BITMAP, max_index = 0x%lx, max_size = "
|
||||
"0x%x.", max_index, max_size);
|
||||
for (index = 0UL; index < max_index; index++) {
|
||||
"0x%lx.", max_index, PAGE_CACHE_SIZE / 4);
|
||||
for (index = 0; index < max_index; index++) {
|
||||
unsigned int i;
|
||||
/*
|
||||
* Read the page from page cache, getting it from backing store
|
||||
@ -2100,7 +2092,7 @@ static unsigned long __get_nr_free_mft_records(ntfs_volume *vol)
|
||||
* the result as all out of range bytes are set to zero by
|
||||
* ntfs_readpage().
|
||||
*/
|
||||
for (i = 0; i < max_size; i++)
|
||||
for (i = 0; i < PAGE_CACHE_SIZE / 4; i++)
|
||||
nr_free -= (s64)hweight32(kaddr[i]);
|
||||
kunmap_atomic(kaddr, KM_USER0);
|
||||
page_cache_release(page);
|
||||
@ -2134,8 +2126,11 @@ static unsigned long __get_nr_free_mft_records(ntfs_volume *vol)
|
||||
*/
|
||||
static int ntfs_statfs(struct super_block *sb, struct kstatfs *sfs)
|
||||
{
|
||||
ntfs_volume *vol = NTFS_SB(sb);
|
||||
s64 size;
|
||||
ntfs_volume *vol = NTFS_SB(sb);
|
||||
ntfs_inode *mft_ni = NTFS_I(vol->mft_ino);
|
||||
pgoff_t max_index;
|
||||
unsigned long flags;
|
||||
|
||||
ntfs_debug("Entering.");
|
||||
/* Type of filesystem. */
|
||||
@ -2158,10 +2153,20 @@ static int ntfs_statfs(struct super_block *sb, struct kstatfs *sfs)
|
||||
sfs->f_bavail = sfs->f_bfree = size;
|
||||
/* Serialize accesses to the inode bitmap. */
|
||||
down_read(&vol->mftbmp_lock);
|
||||
read_lock_irqsave(&mft_ni->size_lock, flags);
|
||||
size = i_size_read(vol->mft_ino) >> vol->mft_record_size_bits;
|
||||
/*
|
||||
* Convert the maximum number of set bits into bytes rounded up, then
|
||||
* convert into multiples of PAGE_CACHE_SIZE, rounding up so that if we
|
||||
* have one full and one partial page max_index = 2.
|
||||
*/
|
||||
max_index = ((((mft_ni->initialized_size >> vol->mft_record_size_bits)
|
||||
+ 7) >> 3) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
|
||||
read_unlock_irqrestore(&mft_ni->size_lock, flags);
|
||||
/* Number of inodes in file system (at this point in time). */
|
||||
sfs->f_files = vol->mft_ino->i_size >> vol->mft_record_size_bits;
|
||||
sfs->f_files = size;
|
||||
/* Free inodes in fs (based on current total count). */
|
||||
sfs->f_ffree = __get_nr_free_mft_records(vol);
|
||||
sfs->f_ffree = __get_nr_free_mft_records(vol, size, max_index);
|
||||
up_read(&vol->mftbmp_lock);
|
||||
/*
|
||||
* File system id. This is extremely *nix flavour dependent and even
|
||||
@ -2347,7 +2352,8 @@ static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
|
||||
}
|
||||
|
||||
/* Get the size of the device in units of NTFS_BLOCK_SIZE bytes. */
|
||||
vol->nr_blocks = sb->s_bdev->bd_inode->i_size >> NTFS_BLOCK_SIZE_BITS;
|
||||
vol->nr_blocks = i_size_read(sb->s_bdev->bd_inode) >>
|
||||
NTFS_BLOCK_SIZE_BITS;
|
||||
|
||||
/* Read the boot sector and return unlocked buffer head to it. */
|
||||
if (!(bh = read_ntfs_boot_sector(sb, silent))) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user