Skip to content

L
linux
Commit 2d4d6186 authored by Linus Torvalds's avatar Linus Torvalds
Browse files
Options

Merge http://linux-ntfs.bkbits.net/ntfs-tng-2.5 

into home.transmeta.com:/home/torvalds/v2.5/linux
parents e21a85a7 1d209b00
Hide whitespace changes
Inline Side-by-side
Showing with 514 additions and 357 deletions
Documentation/filesystems/ntfs.txt
View file @ 2d4d6186
......@@ -247,6 +247,9 @@ ChangeLog
Note, a technical ChangeLog aimed at kernel hackers is in fs/ntfs/ChangeLog.
2.0.14:
- Internal changes improving run list merging code and minor locking
change to not rely on BKL in ntfs_statfs().
2.0.13:
- Internal changes towards using iget5_locked() in preparation for
fake inodes and small cleanups to ntfs_volume structure.
......
fs/ntfs/ChangeLog
View file @ 2d4d6186
......@@ -28,6 +28,17 @@ ToDo:
- Enable NFS exporting of NTFS.
- Use fake inodes for address space i/o.
2.0.14 - Run list merging code cleanup, minor locking changes, typo fixes.
- Change fs/ntfs/super.c::ntfs_statfs() to not rely on BKL by moving
the locking out of super.c::get_nr_free_mft_records() and taking and
dropping the mftbmp_lock rw_semaphore in ntfs_statfs() itself.
- Bring attribute run list merging code (fs/ntfs/attrib.c) in sync with
current userspace ntfs library code. This means that if a merge
fails the original run lists are always left unmodified instead of
being silently corrupted.
- Misc typo fixes.
2.0.13 - Use iget5_locked() in preparation for fake inodes and small cleanups.
- Remove nr_mft_bits and the now superfluous union with nr_mft_records
......
fs/ntfs/Makefile
View file @ 2d4d6186
......@@ -5,7 +5,7 @@ obj-$(CONFIG_NTFS_FS) += ntfs.o
ntfs-objs := aops.o attrib.o compress.o debug.o dir.o file.o inode.o mft.o \
mst.o namei.o super.o sysctl.o time.o unistr.o upcase.o
EXTRA_CFLAGS = -DNTFS_VERSION=\"2.0.13\"
EXTRA_CFLAGS = -DNTFS_VERSION=\"2.0.14\"
ifeq ($(CONFIG_NTFS_DEBUG),y)
EXTRA_CFLAGS += -DDEBUG
......
fs/ntfs/attrib.c
View file @ 2d4d6186
......@@ -27,338 +27,433 @@
/* Temporary helper functions -- might become macros */
/**
* rl_mm - run_list memmove
* ntfs_rl_mm - run_list memmove
*
* It is up to the caller to serialize access to the run list @base.
*/
static inline void rl_mm(run_list_element *base, int dst, int src, int size)
static inline void ntfs_rl_mm(run_list_element *base, int dst, int src,
int size)
{
if ((dst != src) && (size > 0))
memmove (base + dst, base + src, size * sizeof (*base));
if (likely((dst != src) && (size > 0)))
memmove(base + dst, base + src, size * sizeof (*base));
}
/**
* rl_mc - run_list memory copy
* ntfs_rl_mc - run_list memory copy
*
* It is up to the caller to serialize access to the run lists @dstbase and
* @srcbase.
*/
static inline void rl_mc(run_list_element *dstbase, int dst,
static inline void ntfs_rl_mc(run_list_element *dstbase, int dst,
run_list_element *srcbase, int src, int size)
{
if (size > 0)
memcpy (dstbase+dst, srcbase+src, size * sizeof (*dstbase));
if (likely(size > 0))
memcpy(dstbase + dst, srcbase + src, size * sizeof(*dstbase));
}
/**
* ntfs_rl_realloc - Reallocate memory for run_lists
* @orig: The original memory allocation
* @old: The number of run_lists in the original
* @new: The number of run_lists we need space for
* @rl: original run list
* @old_size: number of run list elements in the original run list @rl
* @new_size: number of run list elements we need space for
*
* As the run_lists grow, more memory will be required. To prevent the
* kernel having to allocate and reallocate large numbers of small bits of
* memory, this function returns and entire page of memory.
*
* It is up to the caller to serialize access to the run list @orig.
* It is up to the caller to serialize access to the run list @rl.
*
* N.B. If the new allocation doesn't require a different number of pages in
* memory, the function will return the original pointer.
*
* Return: Pointer The newly allocated, or recycled, memory.
*
* Errors: -ENOMEM, Not enough memory to allocate run list array.
* -EINVAL, Invalid parameters were passed in.
* On success, return a pointer to the newly allocated, or recycled, memory.
* On error, return -errno. The following error codes are defined:
* -ENOMEM - Not enough memory to allocate run list array.
* -EINVAL - Invalid parameters were passed in.
*/
static inline run_list_element *ntfs_rl_realloc(run_list_element *orig,
int old, int new)
static inline run_list_element *ntfs_rl_realloc(run_list_element *rl,
int old_size, int new_size)
{
run_list_element *nrl;
run_list_element *new_rl;
old = PAGE_ALIGN (old * sizeof (*orig));
new = PAGE_ALIGN (new * sizeof (*orig));
if (old == new)
return orig;
old_size = PAGE_ALIGN(old_size * sizeof(*rl));
new_size = PAGE_ALIGN(new_size * sizeof(*rl));
if (old_size == new_size)
return rl;
nrl = ntfs_malloc_nofs (new);
if (!nrl)
return ERR_PTR (-ENOMEM);
new_rl = ntfs_malloc_nofs(new_size);
if (unlikely(!new_rl))
return ERR_PTR(-ENOMEM);
if (orig) {
memcpy (nrl, orig, min (old, new));
ntfs_free (orig);
if (likely(rl != NULL)) {
if (unlikely(old_size > new_size))
old_size = new_size;
memcpy(new_rl, rl, old_size);
ntfs_free(rl);
}
return nrl;
return new_rl;
}
/**
* ntfs_rl_merge - Join together two run_lists
* @one: The first run_list and destination
* @two: The second run_list
* ntfs_are_rl_mergeable - test if two run lists can be joined together
* @dst: original run list
* @src: new run list to test for mergeability with @dst
*
* If possible merge together two run_lists. For this, their VCNs and LCNs
* Test if two run lists can be joined together. For this, their VCNs and LCNs
* must be adjacent.
*
* It is up to the caller to serialize access to the run lists @one and @two.
* It is up to the caller to serialize access to the run lists @dst and @src.
*
* Return: TRUE Success, the run_lists were merged
* FALSE Failure, the run_lists were not merged
* Return: TRUE Success, the run lists can be merged.
* FALSE Failure, the run lists cannot be merged.
*/
static inline BOOL ntfs_rl_merge(run_list_element *one, run_list_element *two)
static inline BOOL ntfs_are_rl_mergeable(run_list_element *dst,
run_list_element *src)
{
BUG_ON (!one || !two);
BUG_ON(!dst || !src);
if ((one->lcn < 0) || (two->lcn < 0)) /* Are we merging holes? */
if ((dst->lcn < 0) || (src->lcn < 0)) /* Are we merging holes? */
return FALSE;
if ((one->lcn + one->length) != two->lcn) /* Are the runs contiguous? */
if ((dst->lcn + dst->length) != src->lcn) /* Are the runs contiguous? */
return FALSE;
if ((one->vcn + one->length) != two->vcn) /* Are the runs misaligned? */
if ((dst->vcn + dst->length) != src->vcn) /* Are the runs misaligned? */
return FALSE;
one->length += two->length;
return TRUE;
}
/**
* ntfs_rl_append - Append a run_list after the given element
* @orig: The original run_list to be worked on.
* @osize: The number of elements in @orig (including end marker).
* @new: The run_list to be inserted.
* @nsize: The number of elements in @new (excluding end marker).
* @loc: Append the new run_list after this element in @orig.
* __ntfs_rl_merge - merge two run lists without testing if they can be merged
* @dst: original, destination run list
* @src: new run list to merge with @dst
*
* Append a run_list after element @loc in @orig. Merge the right end of
* the new run_list, if necessary. Adjust the size of the hole before the
* appended run_list.
* Merge the two run lists, writing into the destination run list @dst. The
* caller must make sure the run lists can be merged or this will corrupt the
* destination run list.
*
* It is up to the caller to serialize access to the run lists @orig and @new.
* It is up to the caller to serialize access to the run lists @dst and @src.
*/
static inline void __ntfs_rl_merge(run_list_element *dst, run_list_element *src)
{
dst->length += src->length;
}
/**
* ntfs_rl_merge - test if two run lists can be joined together and merge them
* @dst: original, destination run list
* @src: new run list to merge with @dst
*
* Return: Pointer, The new, combined, run_list
* Test if two run lists can be joined together. For this, their VCNs and LCNs
* must be adjacent. If they can be merged, perform the merge, writing into
* the destination run list @dst.
*
* Errors: -ENOMEM, Not enough memory to allocate run list array.
* -EINVAL, Invalid parameters were passed in.
* It is up to the caller to serialize access to the run lists @dst and @src.
*
* Return: TRUE Success, the run lists have been merged.
* FALSE Failure, the run lists cannot be merged and have not been
* modified.
*/
static inline run_list_element *ntfs_rl_append(run_list_element *orig,
int osize, run_list_element *new, int nsize, int loc)
static inline BOOL ntfs_rl_merge(run_list_element *dst, run_list_element *src)
{
BOOL merge = ntfs_are_rl_mergeable(dst, src);
if (merge)
__ntfs_rl_merge(dst, src);
return merge;
}
/**
* ntfs_rl_append - append a run list after a given element
* @dst: original run list to be worked on
* @dsize: number of elements in @dst (including end marker)
* @src: run list to be inserted into @dst
* @ssize: number of elements in @src (excluding end marker)
* @loc: append the new run list @src after this element in @dst
*
* Append the run list @src after element @loc in @dst. Merge the right end of
* the new run list, if necessary. Adjust the size of the hole before the
* appended run list.
*
* It is up to the caller to serialize access to the run lists @dst and @src.
*
* On success, return a pointer to the new, combined, run list. Note, both
* run lists @dst and @src are deallocated before returning so you cannot use
* the pointers for anything any more. (Strictly speaking the returned run list
* may be the same as @dst but this is irrelevant.)
*
* On error, return -errno. Both run lists are left unmodified. The following
* error codes are defined:
* -ENOMEM - Not enough memory to allocate run list array.
* -EINVAL - Invalid parameters were passed in.
*/
static inline run_list_element *ntfs_rl_append(run_list_element *dst,
int dsize, run_list_element *src, int ssize, int loc)
{
run_list_element *res;
BOOL right;
int magic;
BUG_ON (!orig || !new);
BUG_ON(!dst || !src);
/* First, check if the right hand end needs merging. */
right = ntfs_are_rl_mergeable(src + ssize - 1, dst + loc + 1);
/* Space required: @dst size + @src size, less one if we merged. */
dst = ntfs_rl_realloc(dst, dsize, dsize + ssize - right);
if (IS_ERR(dst))
return dst;
/*
* We are guaranteed to succeed from here so can start modifying the
* original run lists.
*/
/* First, merge the right hand end, if necessary. */
right = ntfs_rl_merge (new + nsize - 1, orig + loc + 1);
if (right)
__ntfs_rl_merge(src + ssize - 1, dst + loc + 1);
/* Space required: Orig size + New size, less one if we merged. */
res = ntfs_rl_realloc (orig, osize, osize + nsize - right);
if (IS_ERR (res))
return res;
magic = loc + ssize;
/* Move the tail of Orig out of the way, then copy in New. */
rl_mm (res, loc + 1 + nsize, loc + 1 + right, osize - loc - 1 - right);
rl_mc (res, loc + 1, new, 0, nsize);
/* Move the tail of @dst out of the way, then copy in @src. */
ntfs_rl_mm(dst, magic + 1, loc + 1 + right, dsize - loc - 1 - right);
ntfs_rl_mc(dst, loc + 1, src, 0, ssize);
/* Adjust the size of the preceding hole. */
res[loc].length = res[loc+1].vcn - res[loc].vcn;
dst[loc].length = dst[loc + 1].vcn - dst[loc].vcn;
/* We may have changed the length of the file, so fix the end marker */
if (res[loc+nsize+1].lcn == LCN_ENOENT)
res[loc+nsize+1].vcn = res[loc+nsize].vcn + res[loc+nsize].length;
if (dst[magic + 1].lcn == LCN_ENOENT)
dst[magic + 1].vcn = dst[magic].vcn + dst[magic].length;
return res;
return dst;
}
/**
* ntfs_rl_insert - Insert a run_list into another
* @orig: The original run_list to be worked on.
* @osize: The number of elements in @orig (including end marker).
* @new: The run_list to be inserted.
* @nsize: The number of elements in @new (excluding end marker).
* @loc: Insert the new run_list before this element in @orig.
*
* Insert a run_list before element @loc in @orig. Merge the left end of
* the new run_list, if necessary. Adjust the size of the hole after the
* inserted run_list.
*
* It is up to the caller to serialize access to the run lists @orig and @new.
*
* Return: Pointer, The new, combined, run_list
*
* Errors: -ENOMEM, Not enough memory to allocate run list array.
* -EINVAL, Invalid parameters were passed in.
* ntfs_rl_insert - insert a run list into another
* @dst: original run list to be worked on
* @dsize: number of elements in @dst (including end marker)
* @src: new run list to be inserted
* @ssize: number of elements in @src (excluding end marker)
* @loc: insert the new run list @src before this element in @dst
*
* Insert the run list @src before element @loc in the run list @dst. Merge the
* left end of the new run list, if necessary. Adjust the size of the hole
* after the inserted run list.
*
* It is up to the caller to serialize access to the run lists @dst and @src.
*
* On success, return a pointer to the new, combined, run list. Note, both
* run lists @dst and @src are deallocated before returning so you cannot use
* the pointers for anything any more. (Strictly speaking the returned run list
* may be the same as @dst but this is irrelevant.)
*
* On error, return -errno. Both run lists are left unmodified. The following
* error codes are defined:
* -ENOMEM - Not enough memory to allocate run list array.
* -EINVAL - Invalid parameters were passed in.
*/
static inline run_list_element *ntfs_rl_insert(run_list_element *orig,
int osize, run_list_element *new, int nsize, int loc)
static inline run_list_element *ntfs_rl_insert(run_list_element *dst,
int dsize, run_list_element *src, int ssize, int loc)
{
run_list_element *res;
BOOL left = FALSE;
BOOL disc = FALSE; /* Discontinuity */
BOOL hole = FALSE; /* Following a hole */
int magic;
BUG_ON (!orig || !new);
BUG_ON(!dst || !src);
/* disc => Discontinuity between the end of Orig and the start of New.
/* disc => Discontinuity between the end of @dst and the start of @src.
* This means we might need to insert a hole.
* hole => Orig ends with a hole or an unmapped region which we can
* hole => @dst ends with a hole or an unmapped region which we can
* extend to match the discontinuity. */
if (loc == 0) {
disc = (new[0].vcn > 0);
} else {
left = ntfs_rl_merge (orig + loc - 1, new);
if (loc == 0)
disc = (src[0].vcn > 0);
else {
s64 merged_length;
left = ntfs_are_rl_mergeable(dst + loc - 1, src);
merged_length = dst[loc - 1].length;
if (left)
merged_length += src->length;
disc = (new[0].vcn > (orig[loc-1].vcn + orig[loc-1].length));
disc = (src[0].vcn > dst[loc - 1].vcn + merged_length);
if (disc)
hole = (orig[loc-1].lcn == LCN_HOLE);
hole = (dst[loc - 1].lcn == LCN_HOLE);
}
/* Space required: Orig size + New size, less one if we merged,
* plus one if there was a discontinuity, less one for a trailing hole */
res = ntfs_rl_realloc (orig, osize, osize + nsize - left + disc - hole);
if (IS_ERR (res))
return res;
/* Space required: @dst size + @src size, less one if we merged, plus
* one if there was a discontinuity, less one for a trailing hole. */
dst = ntfs_rl_realloc(dst, dsize, dsize + ssize - left + disc - hole);
if (IS_ERR(dst))
return dst;
/*
* We are guaranteed to succeed from here so can start modifying the
* original run list.
*/
if (left)
__ntfs_rl_merge(dst + loc - 1, src);
/* Move the tail of Orig out of the way, then copy in New. */
rl_mm (res, loc + nsize - left + disc - hole, loc, osize - loc);
rl_mc (res, loc + disc - hole, new, left, nsize - left);
magic = loc + ssize - left + disc - hole;
/* Move the tail of @dst out of the way, then copy in @src. */
ntfs_rl_mm(dst, magic, loc, dsize - loc);
ntfs_rl_mc(dst, loc + disc - hole, src, left, ssize - left);
/* Adjust the VCN of the last run ... */
if (res[loc+nsize-left+disc-hole].lcn <= LCN_HOLE) {
res[loc+nsize-left+disc-hole].vcn =
res[loc+nsize-left+disc-hole-1].vcn +
res[loc+nsize-left+disc-hole-1].length;
}
if (dst[magic].lcn <= LCN_HOLE)
dst[magic].vcn = dst[magic - 1].vcn + dst[magic - 1].length;
/* ... and the length. */
if ((res[loc+nsize-left+disc-hole].lcn == LCN_HOLE) ||
(res[loc+nsize-left+disc-hole].lcn == LCN_RL_NOT_MAPPED)) {
res[loc+nsize-left+disc-hole].length =
res[loc+nsize-left+disc-hole+1].vcn -
res[loc+nsize-left+disc-hole].vcn;
}
if (dst[magic].lcn == LCN_HOLE || dst[magic].lcn == LCN_RL_NOT_MAPPED)
dst[magic].length = dst[magic + 1].vcn - dst[magic].vcn;
/* Writing beyond the end of the file and there's a discontinuity. */
if (disc) {
if (hole) {
res[loc-1].length = res[loc].vcn - res[loc-1].vcn;
} else {
if (hole)
dst[loc - 1].length = dst[loc].vcn - dst[loc - 1].vcn;
else {
if (loc > 0) {
res[loc].vcn = res[loc-1].vcn +
res[loc-1].length;
res[loc].length = res[loc+1].vcn - res[loc].vcn;
dst[loc].vcn = dst[loc - 1].vcn +
dst[loc - 1].length;
dst[loc].length = dst[loc + 1].vcn -
dst[loc].vcn;
} else {
res[loc].vcn = 0;
res[loc].length = res[loc+1].vcn;
dst[loc].vcn = 0;
dst[loc].length = dst[loc + 1].vcn;
}
res[loc].lcn = LCN_RL_NOT_MAPPED;
dst[loc].lcn = LCN_RL_NOT_MAPPED;
}
if (res[loc+nsize-left+disc].lcn == LCN_ENOENT)
res[loc+nsize-left+disc].vcn = res[loc+nsize-left+disc-1].vcn +
res[loc+nsize-left+disc-1].length;
}
magic += hole;
return res;
if (dst[magic].lcn == LCN_ENOENT)
dst[magic].vcn = dst[magic - 1].vcn +
dst[magic - 1].length;
}
return dst;
}
/**
* ntfs_rl_replace - Overwrite a run_list element with another run_list
* @orig: The original run_list to be worked on.
* @osize: The number of elements in @orig (including end marker).
* @new: The run_list to be inserted.
* @nsize: The number of elements in @new (excluding end marker).
* @loc: Index of run_list @orig to overwrite with @new.
*
* Replace the run_list at @loc with @new. Merge the left and right ends of
* the inserted run_list, if necessary.
*
* It is up to the caller to serialize access to the run lists @orig and @new.
*
* Return: Pointer, The new, combined, run_list
*
* Errors: -ENOMEM, Not enough memory to allocate run list array.
* -EINVAL, Invalid parameters were passed in.
* ntfs_rl_replace - overwrite a run_list element with another run list
* @dst: original run list to be worked on
* @dsize: number of elements in @dst (including end marker)
* @src: new run list to be inserted
* @ssize: number of elements in @src (excluding end marker)
* @loc: index in run list @dst to overwrite with @src
*
* Replace the run list element @dst at @loc with @src. Merge the left and
* right ends of the inserted run list, if necessary.
*
* It is up to the caller to serialize access to the run lists @dst and @src.
*
* On success, return a pointer to the new, combined, run list. Note, both
* run lists @dst and @src are deallocated before returning so you cannot use
* the pointers for anything any more. (Strictly speaking the returned run list
* may be the same as @dst but this is irrelevant.)
*
* On error, return -errno. Both run lists are left unmodified. The following
* error codes are defined:
* -ENOMEM - Not enough memory to allocate run list array.
* -EINVAL - Invalid parameters were passed in.
*/
static inline run_list_element *ntfs_rl_replace(run_list_element *orig,
int osize, run_list_element *new, int nsize, int loc)
static inline run_list_element *ntfs_rl_replace(run_list_element *dst,
int dsize, run_list_element *src, int ssize, int loc)
{
run_list_element *res;
BOOL left = FALSE;
BOOL right;
int magic;
BUG_ON (!orig || !new);
BUG_ON(!dst || !src);
/* First, merge the left and right ends, if necessary. */
right = ntfs_rl_merge (new + nsize - 1, orig + loc + 1);
right = ntfs_are_rl_mergeable(src + ssize - 1, dst + loc + 1);
if (loc > 0)
left = ntfs_rl_merge (orig + loc - 1, new);
left = ntfs_are_rl_mergeable(dst + loc - 1, src);
/* Allocate some space. We'll need less if the left, right, or both
* ends were merged. */
dst = ntfs_rl_realloc(dst, dsize, dsize + ssize - left - right);
if (IS_ERR(dst))
return dst;
/*
* We are guaranteed to succeed from here so can start modifying the
* original run lists.
*/
if (right)
__ntfs_rl_merge(src + ssize - 1, dst + loc + 1);
if (left)
__ntfs_rl_merge(dst + loc - 1, src);
/* Allocate some space. We'll need less if the left, right
* or both ends were merged. */
res = ntfs_rl_realloc (orig, osize, osize + nsize - left - right);
if (IS_ERR (res))
return res;
/* FIXME: What does this mean? (AIA) */
magic = loc + ssize - left;
/* Move the tail of Orig out of the way, then copy in New. */
rl_mm (res, loc + nsize - left, loc + right + 1,
osize - loc - right - 1);
rl_mc (res, loc, new, left, nsize - left);
/* Move the tail of @dst out of the way, then copy in @src. */
ntfs_rl_mm(dst, magic, loc + right + 1, dsize - loc - right - 1);
ntfs_rl_mc(dst, loc, src, left, ssize - left);
/* We may have changed the length of the file, so fix the end marker */
if (res[loc+nsize-left].lcn == LCN_ENOENT)
res[loc+nsize-left].vcn = res[loc+nsize-left-1].vcn +
res[loc+nsize-left-1].length;
return res;
if (dst[magic].lcn == LCN_ENOENT)
dst[magic].vcn = dst[magic - 1].vcn + dst[magic - 1].length;
return dst;
}
/**
* ntfs_rl_split - Insert a run_list into the centre of a hole
* @orig: The original run_list to be worked on.
* @osize: The number of elements in @orig (including end marker).
* @new: The run_list to be inserted.
* @nsize: The number of elements in @new (excluding end marker).
* @loc: Index of run_list in @orig to split with @new.
*
* Split the run_list at @loc into two and insert @new. No merging of
* run_lists is necessary. Adjust the size of the holes either side.
*
* It is up to the caller to serialize access to the run lists @orig and @new.
*
* Return: Pointer, The new, combined, run_list
*
* Errors: -ENOMEM, Not enough memory to allocate run list array.
* -EINVAL, Invalid parameters were passed in.
* ntfs_rl_split - insert a run list into the centre of a hole
* @dst: original run list to be worked on
* @dsize: number of elements in @dst (including end marker)
* @src: new run list to be inserted
* @ssize: number of elements in @src (excluding end marker)
* @loc: index in run list @dst at which to split and insert @src
*
* Split the run list @dst at @loc into two and insert @new in between the two
* fragments. No merging of run lists is necessary. Adjust the size of the
* holes either side.
*
* It is up to the caller to serialize access to the run lists @dst and @src.
*
* On success, return a pointer to the new, combined, run list. Note, both
* run lists @dst and @src are deallocated before returning so you cannot use
* the pointers for anything any more. (Strictly speaking the returned run list
* may be the same as @dst but this is irrelevant.)
*
* On error, return -errno. Both run lists are left unmodified. The following
* error codes are defined:
* -ENOMEM - Not enough memory to allocate run list array.
* -EINVAL - Invalid parameters were passed in.
*/
static inline run_list_element *ntfs_rl_split(run_list_element *orig, int osize,
run_list_element *new, int nsize, int loc)
static inline run_list_element *ntfs_rl_split(run_list_element *dst, int dsize,
run_list_element *src, int ssize, int loc)
{
run_list_element *res;
BUG_ON (!orig || !new);
BUG_ON(!dst || !src);
/* Space required: Orig size + New size + One new hole. */
res = ntfs_rl_realloc (orig, osize, osize + nsize + 1);
if (IS_ERR (res))
return res;
/* Space required: @dst size + @src size + one new hole. */
dst = ntfs_rl_realloc(dst, dsize, dsize + ssize + 1);
if (IS_ERR(dst))
return dst;
/*
* We are guaranteed to succeed from here so can start modifying the
* original run lists.
*/
/* Move the tail of Orig out of the way, then copy in New. */
rl_mm (res, loc + 1 + nsize, loc, osize - loc);
rl_mc (res, loc + 1, new, 0, nsize);
/* Move the tail of @dst out of the way, then copy in @src. */
ntfs_rl_mm(dst, loc + 1 + ssize, loc, dsize - loc);
ntfs_rl_mc(dst, loc + 1, src, 0, ssize);
/* Adjust the size of the holes either size of New. */
res[loc].length = res[loc+1].vcn - res[loc].vcn;
res[loc+nsize+1].vcn = res[loc+nsize].vcn + res[loc+nsize].length;
res[loc+nsize+1].length = res[loc+nsize+2].vcn - res[loc+nsize+1].vcn;
/* Adjust the size of the holes either size of @src. */
dst[loc].length = dst[loc+1].vcn - dst[loc].vcn;
dst[loc+ssize+1].vcn = dst[loc+ssize].vcn + dst[loc+ssize].length;
dst[loc+ssize+1].length = dst[loc+ssize+2].vcn - dst[loc+ssize+1].vcn;
return res;
return dst;
}
/**
* merge_run_lists - merge two run_lists into one
* @drl: The original run_list.
* @srl: The new run_list to be merge into @drl.
* ntfs_merge_run_lists - merge two run_lists into one
* @drl: original run list to be worked on
* @srl: new run list to be merged into @drl
*
* First we sanity check the two run_lists to make sure that they are sensible
* and can be merged. The @srl run_list must be either after the @drl run_list
* or completely within a hole in @drl.
* First we sanity check the two run lists @srl and @drl to make sure that they
* are sensible and can be merged. The run list @srl must be either after the
* run list @drl or completely within a hole (or unmapped region) in @drl.
*
* It is up to the caller to serialize access to the run lists @drl and @srl.
*
......@@ -366,25 +461,28 @@ static inline run_list_element *ntfs_rl_split(run_list_element *orig, int osize,
* 1. When attribute lists are used and a further extent is being mapped.
* 2. When new clusters are allocated to fill a hole or extend a file.
*
* There are four possible ways @srl can be merged. It can be inserted at
* the beginning of a hole; split the hole in two; appended at the end of
* a hole; replace the whole hole. It can also be appended to the end of
* the run_list, which is just a variant of the insert case.
*
* N.B. Either, or both, of the input pointers may be freed if the function
* is successful. Only the returned pointer may be used.
*
* If the function fails, neither of the input run_lists may be safe.
*
* Return: Pointer, The resultant merged run_list.
*
* Errors: -ENOMEM, Not enough memory to allocate run list array.
* -EINVAL, Invalid parameters were passed in.
* -ERANGE, The run_lists overlap and cannot be merged.
* There are four possible ways @srl can be merged. It can:
* - be inserted at the beginning of a hole,
* - split the hole in two and be inserted between the two fragments,
* - be appended at the end of a hole, or it can
* - replace the whole hole.
* It can also be appended to the end of the run list, which is just a variant
* of the insert case.
*
* On success, return a pointer to the new, combined, run list. Note, both
* run lists @drl and @srl are deallocated before returning so you cannot use
* the pointers for anything any more. (Strictly speaking the returned run list
* may be the same as @dst but this is irrelevant.)
*
* On error, return -errno. Both run lists are left unmodified. The following
* error codes are defined:
* -ENOMEM - Not enough memory to allocate run list array.
* -EINVAL - Invalid parameters were passed in.
* -ERANGE - The run lists overlap and cannot be merged.
*/
run_list_element *merge_run_lists(run_list_element *drl, run_list_element *srl)
run_list_element *ntfs_merge_run_lists(run_list_element *drl,
run_list_element *srl)
{
run_list_element *nrl; /* New run list. */
int di, si; /* Current index into @[ds]rl. */
int sstart; /* First index with lcn > LCN_RL_NOT_MAPPED. */
int dins; /* Index into @drl at which to insert @srl. */
......@@ -392,49 +490,49 @@ run_list_element *merge_run_lists(run_list_element *drl, run_list_element *srl)
int dfinal, sfinal; /* The last index into @[ds]rl with
lcn >= LCN_HOLE. */
int marker = 0;
VCN marker_vcn = 0;
#if 1
ntfs_debug ("dst:");
ntfs_debug_dump_runlist (drl);
ntfs_debug ("src:");
ntfs_debug_dump_runlist (srl);
#ifdef DEBUG
ntfs_debug("dst:");
ntfs_debug_dump_runlist(drl);
ntfs_debug("src:");
ntfs_debug_dump_runlist(srl);
#endif
/* Check for silly calling... */
if (unlikely (!srl))
if (unlikely(!srl))
return drl;
if (unlikely (IS_ERR (srl) || IS_ERR (drl)))
return ERR_PTR (-EINVAL);
if (unlikely(IS_ERR(srl) || IS_ERR(drl)))
return ERR_PTR(-EINVAL);
/* Check for the case where the first mapping is being done now. */
if (unlikely (!drl)) {
nrl = srl;
if (unlikely(!drl)) {
drl = srl;
/* Complete the source run list if necessary. */
if (unlikely (srl[0].vcn)) {
if (unlikely(drl[0].vcn)) {
/* Scan to the end of the source run list. */
for (send = 0; likely (srl[send].length); send++)
for (dend = 0; likely(drl[dend].length); dend++)
;
nrl = ntfs_rl_realloc (srl, send, send + 1);
if (!nrl)
return ERR_PTR (-ENOMEM);
rl_mm (nrl, 1, 0, send);
nrl[0].vcn = 0; /* Add start element. */
nrl[0].lcn = LCN_RL_NOT_MAPPED;
nrl[0].length = nrl[1].vcn;
drl = ntfs_rl_realloc(drl, dend, dend + 1);
if (IS_ERR(drl))
return drl;
/* Insert start element at the front of the run list. */
ntfs_rl_mm(drl, 1, 0, dend);
drl[0].vcn = 0;
drl[0].lcn = LCN_RL_NOT_MAPPED;
drl[0].length = drl[1].vcn;
}
goto finished;
}
si = di = 0;
/* Skip the unmapped start element(s) in each run_list if present. */
/* Skip any unmapped start element(s) in the source run_list. */
while (srl[si].length && srl[si].lcn < (LCN)LCN_HOLE)
si++;
/* Can't have an entirely unmapped srl run_list. */
BUG_ON (!srl[si].length);
/* Can't have an entirely unmapped source run list. */
BUG_ON(!srl[si].length);
/* Record the starting points. */
sstart = si;
......@@ -445,19 +543,16 @@ run_list_element *merge_run_lists(run_list_element *drl, run_list_element *srl)
* appended to @drl.
*/
for (; drl[di].length; di++) {
if ((drl[di].vcn + drl[di].length) > srl[sstart].vcn)
if (drl[di].vcn + drl[di].length > srl[sstart].vcn)
break;
}
dins = di;
/* Sanity check for illegal overlaps. */
if ((drl[di].vcn == srl[si].vcn) &&
(drl[di].lcn >= 0) &&
(srl[si].lcn >= 0)) {
ntfs_error (NULL, "Run lists overlap. Cannot merge! Returning "
"ERANGE.");
nrl = ERR_PTR (-ERANGE);
goto exit;
if ((drl[di].vcn == srl[si].vcn) && (drl[di].lcn >= 0) &&
(srl[si].lcn >= 0)) {
ntfs_error(NULL, "Run lists overlap. Cannot merge!");
return ERR_PTR(-ERANGE);
}
/* Scan to the end of both run lists in order to know their sizes. */
......@@ -466,9 +561,8 @@ run_list_element *merge_run_lists(run_list_element *drl, run_list_element *srl)
for (dend = di; drl[dend].length; dend++)
;
if (srl[send].lcn == LCN_ENOENT) {
marker = send;
}
if (srl[send].lcn == (LCN)LCN_ENOENT)
marker_vcn = srl[marker = send].vcn;
/* Scan to the last element with lcn >= LCN_HOLE. */
for (sfinal = send; sfinal >= 0 && srl[sfinal].lcn < LCN_HOLE; sfinal--)
......@@ -479,96 +573,142 @@ run_list_element *merge_run_lists(run_list_element *drl, run_list_element *srl)
{
BOOL start;
BOOL finish;
int ds = dend + 1; /* Number of elements in drl & srl */
int ds = dend + 1; /* Number of elements in drl & srl */
int ss = sfinal - sstart + 1;
start = ((drl[dins].lcn < LCN_RL_NOT_MAPPED) || /* End of file */
(drl[dins].vcn == srl[sstart].vcn)); /* Start of hole */
finish = ((drl[dins].lcn >= LCN_RL_NOT_MAPPED) && /* End of file */
((drl[dins].vcn + drl[dins].length) <= /* End of hole */
(srl[send-1].vcn + srl[send-1].length)));
(srl[send - 1].vcn + srl[send - 1].length)));
/* Or we'll lose an end marker */
if (start && finish && (drl[dins].length == 0))
ss++;
if (marker && (drl[dins].vcn + drl[dins].length > srl[send-1].vcn))
if (marker && (drl[dins].vcn + drl[dins].length > srl[send - 1].vcn))
finish = FALSE;
#if 0
ntfs_debug("dfinal = %i, dend = %i", dfinal, dend);
ntfs_debug("sstart = %i, sfinal = %i, send = %i", sstart, sfinal, send);
ntfs_debug("start = %i, finish = %i", start, finish);
ntfs_debug("ds = %i, ss = %i, dins = %i", ds, ss, dins);
#endif
if (start)
if (start) {
if (finish)
nrl = ntfs_rl_replace (drl, ds, srl + sstart, ss, dins);
drl = ntfs_rl_replace(drl, ds, srl + sstart, ss, dins);
else
nrl = ntfs_rl_insert (drl, ds, srl + sstart, ss, dins);
else
drl = ntfs_rl_insert(drl, ds, srl + sstart, ss, dins);
} else {
if (finish)
nrl = ntfs_rl_append (drl, ds, srl + sstart, ss, dins);
drl = ntfs_rl_append(drl, ds, srl + sstart, ss, dins);
else
nrl = ntfs_rl_split (drl, ds, srl + sstart, ss, dins);
if (marker && !IS_ERR(nrl)) {
for (ds = 0; nrl[ds].length; ds++)
drl = ntfs_rl_split(drl, ds, srl + sstart, ss, dins);
}
if (IS_ERR(drl)) {
ntfs_error(NULL, "Merge failed.");
return drl;
}
ntfs_free(srl);
if (marker) {
ntfs_debug("Triggering marker code.");
for (ds = dend; drl[ds].length; ds++)
;
nrl = ntfs_rl_insert(nrl, ds + 1, srl + marker, 1, ds);
/* We only need to care if @srl ended after @drl. */
if (drl[ds].vcn <= marker_vcn) {
int slots = 0;
if (drl[ds].vcn == marker_vcn) {
ntfs_debug("Old marker = 0x%Lx, replacing with "
"LCN_ENOENT.\n",
(unsigned long long)
drl[ds].lcn);
drl[ds].lcn = (LCN)LCN_ENOENT;
goto finished;
}
/*
* We need to create an unmapped run list element in
* @drl or extend an existing one before adding the
* ENOENT terminator.
*/
if (drl[ds].lcn == (LCN)LCN_ENOENT) {
ds--;
slots = 1;
}
if (drl[ds].lcn != (LCN)LCN_RL_NOT_MAPPED) {
/* Add an unmapped run list element. */
if (!slots) {
/* FIXME/TODO: We need to have the
* extra memory already! (AIA) */
drl = ntfs_rl_realloc(drl, ds, ds + 2);
if (!drl)
goto critical_error;
slots = 2;
}
ds++;
/* Need to set vcn if it isn't set already. */
if (slots != 1)
drl[ds].vcn = drl[ds - 1].vcn +
drl[ds - 1].length;
drl[ds].lcn = (LCN)LCN_RL_NOT_MAPPED;
/* We now used up a slot. */
slots--;
}
drl[ds].length = marker_vcn - drl[ds].vcn;
/* Finally add the ENOENT terminator. */
ds++;
if (!slots) {
/* FIXME/TODO: We need to have the extra
* memory already! (AIA) */
drl = ntfs_rl_realloc(drl, ds, ds + 1);
if (!drl)
goto critical_error;
}
drl[ds].vcn = marker_vcn;
drl[ds].lcn = (LCN)LCN_ENOENT;
drl[ds].length = (s64)0;
}
}
}
if (likely (!IS_ERR (nrl))) {
/* The merge was completed successfully. */
finished:
if (nrl != srl)
ntfs_free (srl);
/*ntfs_debug ("Done.");*/
/*ntfs_debug ("Merged run list:");*/
#if 1
ntfs_debug ("res:");
ntfs_debug_dump_runlist (nrl);
#endif
} else {
ntfs_error (NULL, "Merge failed, returning error code %ld.",
-PTR_ERR (nrl));
}
exit:
return nrl;
/* The merge was completed successfully. */
ntfs_debug("Merged run list:");
ntfs_debug_dump_runlist(drl);
return drl;
critical_error:
/* Critical error! We cannot afford to fail here. */
ntfs_error(NULL, "Critical error! Not enough memory.");
panic("NTFS: Cannot continue.");
}
/**
* decompress_mapping_pairs - convert mapping pairs array to run list
* @vol: ntfs volume on which the attribute resides
* @attr: attribute record whose mapping pairs array to decompress
* @run_list: optional run list in which to insert @attr's run list
*
* Decompress the attribute @attr's mapping pairs array into a run_list and
* return the run list or -errno on error. If @run_list is not NULL then
* the mapping pairs array of @attr is decompressed and the run list inserted
* into the appropriate place in @run_list. If this is the case and the
* function returns success, the original pointer passed into @run_list is no
* longer valid.
* @old_rl: optional run list in which to insert @attr's run list
*
* It is up to the caller to serialize access to the run list @old_rl.
*
* Check the return value for error with IS_ERR(ret_val). If this is FALSE,
* the function was successful, the return value is the new run list, and if
* an existing run list pointer was passed in, this is no longer valid.
* If IS_ERR(ret_val) returns true, there was an error, the return value is not
* a run_list pointer and the existing run list pointer if one was passed in
* has not been touched. In this case use PTR_ERR(ret_val) to obtain the error
* code. Following error codes are defined:
* -ENOMEM Not enough memory to allocate run list array.
* -EIO Corrupt run list.
* -EINVAL Invalid parameters were passed in.
* -ERANGE The two run lists overlap.
* Decompress the attribute @attr's mapping pairs array into a run list. On
* success, return the decompressed run list.
*
* If @old_rl is not NULL, decompressed run list is inserted into the
* appropriate place in @old_rl and the resultant, combined run list is
* returned. The original @old_rl is deallocated.
*
* On error, return -errno. @old_rl is left unmodified in that case.
*
* The following error codes are defined:
* -ENOMEM - Not enough memory to allocate run list array.
* -EIO - Corrupt run list.
* -EINVAL - Invalid parameters were passed in.
* -ERANGE - The two run lists overlap.
*
* FIXME: For now we take the conceptionally simplest approach of creating the
* new run list disregarding the already existing one and then splicing the
* two into one if that is possible (we check for overlap and discard the new
* run list if overlap present and return error).
* two into one, if that is possible (we check for overlap and discard the new
* run list if overlap present before returning ERR_PTR(-ERANGE)).
*/
run_list_element *decompress_mapping_pairs(const ntfs_volume *vol,
const ATTR_RECORD *attr, run_list_element *old_rl)
......@@ -576,12 +716,12 @@ run_list_element *decompress_mapping_pairs(const ntfs_volume *vol,
VCN vcn; /* Current vcn. */
LCN lcn; /* Current lcn. */
s64 deltaxcn; /* Change in [vl]cn. */
run_list_element *rl = NULL; /* The output run_list. */
run_list_element *rl2; /* Temporary run_list. */
run_list_element *rl; /* The output run list. */
u8 *buf; /* Current position in mapping pairs array. */
u8 *attr_end; /* End of attribute. */
int rlsize; /* Size of run_list buffer. */
int rlpos; /* Current run_list position. */
int rlsize; /* Size of run list buffer. */
u16 rlpos; /* Current run list position in units of
run_list_elements. */
u8 b; /* Current byte offset in buf. */
#ifdef DEBUG
......@@ -602,14 +742,12 @@ run_list_element *decompress_mapping_pairs(const ntfs_volume *vol,
ntfs_error(vol->sb, "Corrupt attribute.");
return ERR_PTR(-EIO);
}
/* Current position in run_list array. */
/* Current position in run list array. */
rlpos = 0;
/* Allocate first page. */
rl = ntfs_malloc_nofs(PAGE_SIZE);
/* Allocate first page and set current run list size to one page. */
rl = ntfs_malloc_nofs(rlsize = PAGE_SIZE);
if (unlikely(!rl))
return ERR_PTR(-ENOMEM);
/* Current run_list buffer size in bytes. */
rlsize = PAGE_SIZE;
/* Insert unmapped starting element if necessary. */
if (vcn) {
rl->vcn = (VCN)0;
......@@ -624,18 +762,20 @@ run_list_element *decompress_mapping_pairs(const ntfs_volume *vol,
* operates on whole pages only.
*/
if (((rlpos + 3) * sizeof(*old_rl)) > rlsize) {
run_list_element *rl2;
rl2 = ntfs_malloc_nofs(rlsize + (int)PAGE_SIZE);
if (unlikely(!rl2)) {
ntfs_free(rl);
return ERR_PTR(-ENOMEM);
}
memmove(rl2, rl, rlsize);
memcpy(rl2, rl, rlsize);
ntfs_free(rl);
rl = rl2;
rlsize += PAGE_SIZE;
}
/* Enter the current vcn into the current run_list element. */
(rl + rlpos)->vcn = vcn;
rl[rlpos].vcn = vcn;
/*
* Get the change in vcn, i.e. the run length in clusters.
* Doing it this way ensures that we signextend negative values.
......@@ -664,10 +804,10 @@ run_list_element *decompress_mapping_pairs(const ntfs_volume *vol,
goto err_out;
}
/*
* Enter the current run length into the current run_list
* Enter the current run length into the current run list
* element.
*/
(rl + rlpos)->length = deltaxcn;
rl[rlpos].length = deltaxcn;
/* Increment the current vcn by the current run length. */
vcn += deltaxcn;
/*
......@@ -676,7 +816,7 @@ run_list_element *decompress_mapping_pairs(const ntfs_volume *vol,
* to LCN_HOLE.
*/
if (!(*buf & 0xf0))
(rl + rlpos)->lcn = (LCN)LCN_HOLE;
rl[rlpos].lcn = (LCN)LCN_HOLE;
else {
/* Get the lcn change which really can be negative. */
u8 b2 = *buf & 0xf;
......@@ -709,7 +849,7 @@ run_list_element *decompress_mapping_pairs(const ntfs_volume *vol,
goto err_out;
}
/* Enter the current lcn into the run_list element. */
(rl + rlpos)->lcn = lcn;
rl[rlpos].lcn = lcn;
}
/* Get to the next run_list element. */
rlpos++;
......@@ -729,7 +869,7 @@ run_list_element *decompress_mapping_pairs(const ntfs_volume *vol,
"non-resident attribute.");
goto err_out;
}
/* Setup not mapped run_list element if this is the base extent. */
/* Setup not mapped run list element if this is the base extent. */
if (!attr->_ANR(lowest_vcn)) {
VCN max_cluster;
......@@ -742,13 +882,13 @@ run_list_element *decompress_mapping_pairs(const ntfs_volume *vol,
* likely, there are more extents following this one.
*/
if (deltaxcn < --max_cluster) {
//RAR ntfs_debug("More extents to follow; deltaxcn = 0x%Lx, "
//RAR "max_cluster = 0x%Lx",
//RAR (long long)deltaxcn,
//RAR (long long)max_cluster);
(rl + rlpos)->vcn = vcn;
vcn += (rl + rlpos)->length = max_cluster - deltaxcn;
(rl + rlpos)->lcn = (LCN)LCN_RL_NOT_MAPPED;
ntfs_debug("More extents to follow; deltaxcn = 0x%Lx, "
"max_cluster = 0x%Lx",
(long long)deltaxcn,
(long long)max_cluster);
rl[rlpos].vcn = vcn;
vcn += rl[rlpos].length = max_cluster - deltaxcn;
rl[rlpos].lcn = (LCN)LCN_RL_NOT_MAPPED;
rlpos++;
} else if (unlikely(deltaxcn > max_cluster)) {
ntfs_error(vol->sb, "Corrupt attribute. deltaxcn = "
......@@ -757,25 +897,26 @@ run_list_element *decompress_mapping_pairs(const ntfs_volume *vol,
(long long)max_cluster);
goto mpa_err;
}
(rl + rlpos)->lcn = (LCN)LCN_ENOENT;
rl[rlpos].lcn = (LCN)LCN_ENOENT;
} else /* Not the base extent. There may be more extents to follow. */
(rl + rlpos)->lcn = (LCN)LCN_RL_NOT_MAPPED;
rl[rlpos].lcn = (LCN)LCN_RL_NOT_MAPPED;
/* Setup terminating run_list element. */
(rl + rlpos)->vcn = vcn;
(rl + rlpos)->length = (s64)0;
//RAR ntfs_debug("Mapping pairs array successfully decompressed.");
//RAR ntfs_debug_dump_runlist(rl);
rl[rlpos].vcn = vcn;
rl[rlpos].length = (s64)0;
/* If no existing run list was specified, we are done. */
if (!old_rl)
if (!old_rl) {
ntfs_debug("Mapping pairs array successfully decompressed:");
ntfs_debug_dump_runlist(rl);
return rl;
}
/* Now combine the new and old run lists checking for overlaps. */
rl2 = merge_run_lists(old_rl, rl);
if (likely(!IS_ERR(rl2)))
return rl2;
old_rl = ntfs_merge_run_lists(old_rl, rl);
if (likely(!IS_ERR(old_rl)))
return old_rl;
ntfs_free(rl);
ntfs_error(vol->sb, "Failed to merge run lists.");
return rl2;
return old_rl;
io_error:
ntfs_error(vol->sb, "Corrupt attribute.");
err_out:
......
fs/ntfs/mst.c
View file @ 2d4d6186
......@@ -48,7 +48,7 @@ int post_read_mst_fixup(NTFS_RECORD *b, const u32 size)
usa_ofs = le16_to_cpu(b->usa_ofs);
/* Decrement usa_count to get number of fixups. */
usa_count = le16_to_cpu(b->usa_count) - 1;
/* Size and alignement checks. */
/* Size and alignment checks. */
if ( size & (NTFS_BLOCK_SIZE - 1) ||
usa_ofs & 1 ||
usa_ofs + (usa_count * 2) > size ||
......@@ -132,7 +132,7 @@ int pre_write_mst_fixup(NTFS_RECORD *b, const u32 size)
usa_ofs = le16_to_cpu(b->usa_ofs);
/* Decrement usa_count to get number of fixups. */
usa_count = le16_to_cpu(b->usa_count) - 1;
/* Size and alignement checks. */
/* Size and alignment checks. */
if ( size & (NTFS_BLOCK_SIZE - 1) ||
usa_ofs & 1 ||
usa_ofs + (usa_count * 2) > size ||
......
fs/ntfs/super.c
View file @ 2d4d6186
......@@ -1077,7 +1077,7 @@ static BOOL load_system_files(ntfs_volume *vol)
* releases all inodes and memory belonging to the NTFS specific part of the
* super block.
*/
void ntfs_put_super(struct super_block *vfs_sb)
static void ntfs_put_super(struct super_block *vfs_sb)
{
ntfs_volume *vol = NTFS_SB(vfs_sb);
......@@ -1155,7 +1155,7 @@ void ntfs_put_super(struct super_block *vfs_sb)
* Errors are ignored and we just return the number of free clusters we have
* found. This means we return an underestimate on error.
*/
s64 get_nr_free_clusters(ntfs_volume *vol)
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;
......@@ -1227,7 +1227,7 @@ s64 get_nr_free_clusters(ntfs_volume *vol)
}
/**
* get_nr_free_mft_records - return the number of free inodes on a volume
* __get_nr_free_mft_records - return the number of free inodes on a volume
* @vol: ntfs volume for which to obtain free inode count
*
* Calculate the number of free mft records (inodes) on the mounted NTFS
......@@ -1235,8 +1235,10 @@ s64 get_nr_free_clusters(ntfs_volume *vol)
*
* Errors are ignored and we just return the number of free inodes we have
* found. This means we return an underestimate on error.
*
* NOTE: Caller must hold mftbmp_lock rw_semaphore for reading or writing.
*/
unsigned long get_nr_free_mft_records(ntfs_volume *vol)
static unsigned long __get_nr_free_mft_records(ntfs_volume *vol)
{
struct address_space *mapping;
filler_t *readpage;
......@@ -1247,7 +1249,6 @@ unsigned long get_nr_free_mft_records(ntfs_volume *vol)
ntfs_debug("Entering.");
/* Serialize accesses to the inode bitmap. */
down_read(&vol->mftbmp_lock);
mapping = &vol->mftbmp_mapping;
readpage = (filler_t*)mapping->a_ops->readpage;
/*
......@@ -1307,7 +1308,6 @@ unsigned long get_nr_free_mft_records(ntfs_volume *vol)
}
ntfs_debug("Finished reading $MFT/$BITMAP, last index = 0x%lx",
index - 1);
up_read(&vol->mftbmp_lock);
ntfs_debug("Exiting.");
return nr_free;
}
......@@ -1330,7 +1330,7 @@ unsigned long get_nr_free_mft_records(ntfs_volume *vol)
*
* Return 0 on success or -errno on error.
*/
int ntfs_statfs(struct super_block *sb, struct statfs *sfs)
static int ntfs_statfs(struct super_block *sb, struct statfs *sfs)
{
ntfs_volume *vol = NTFS_SB(sb);
s64 size;
......@@ -1354,10 +1354,12 @@ int ntfs_statfs(struct super_block *sb, struct statfs *sfs)
size = 0LL;
/* Free blocks avail to non-superuser, same as above on NTFS. */
sfs->f_bavail = sfs->f_bfree = size;
down_read(&vol->mftbmp_lock);
/* Total file nodes in file system (at this moment in time). */
sfs->f_files = vol->mft_ino->i_size >> vol->mft_record_size_bits;
/* Free file nodes 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);
up_read(&vol->mftbmp_lock);
/*
* File system id. This is extremely *nix flavour dependent and even
* within Linux itself all fs do their own thing. I interpret this to
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7