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Replace alloca with dm_malloc in _aligned_io.

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(This section of code dates from 2.4 and could be written more efficiently nowadays.)
This commit is contained in:
Alasdair Kergon 2010-09-22 22:31:45 +00:00
parent 980d2d8683
commit 0cb07b65f3
2 changed files with 13 additions and 6 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.02.74 - Version 2.02.74 -
===================================== =====================================
Replace alloca with dm_malloc in _aligned_io.
Fix partial mode operations for lvm1 metadata format. Fix partial mode operations for lvm1 metadata format.
Track recursive filter iteration to avoid refreshing while in use. (2.02.56) Track recursive filter iteration to avoid refreshing while in use. (2.02.56)
Revert to old glibc vsnprintf behaviour in emit_to_buffer() to catch overflow. Revert to old glibc vsnprintf behaviour in emit_to_buffer() to catch overflow.

18
lib/device/dev-io.c
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@ -164,10 +164,11 @@ static void _widen_region(unsigned int block_size, struct device_area *region,
static int _aligned_io(struct device_area *where, void *buffer, static int _aligned_io(struct device_area *where, void *buffer,
int should_write) int should_write)
{ {
void *bounce; void *bounce, *bounce_buf;
unsigned int block_size = 0; unsigned int block_size = 0;
uintptr_t mask; uintptr_t mask;
struct device_area widened; struct device_area widened;
int r = 0;
if (!(where->dev->flags & DEV_REGULAR) && if (!(where->dev->flags & DEV_REGULAR) &&
!_get_block_size(where->dev, &block_size)) !_get_block_size(where->dev, &block_size))
@ -185,8 +186,8 @@ static int _aligned_io(struct device_area *where, void *buffer,
return _io(where, buffer, should_write); return _io(where, buffer, should_write);
/* Allocate a bounce buffer with an extra block */ /* Allocate a bounce buffer with an extra block */
if (!(bounce = alloca((size_t) widened.size + block_size))) { if (!(bounce_buf = bounce = dm_malloc((size_t) widened.size + block_size))) {
log_error("Bounce buffer alloca failed"); log_error("Bounce buffer malloc failed");
return 0; return 0;
} }
@ -199,7 +200,7 @@ static int _aligned_io(struct device_area *where, void *buffer,
/* channel the io through the bounce buffer */ /* channel the io through the bounce buffer */
if (!_io(&widened, bounce, 0)) { if (!_io(&widened, bounce, 0)) {
if (!should_write) if (!should_write)
return_0; goto_out;
/* FIXME pre-extend the file */ /* FIXME pre-extend the file */
memset(bounce, '\n', widened.size); memset(bounce, '\n', widened.size);
} }
@ -209,13 +210,18 @@ static int _aligned_io(struct device_area *where, void *buffer,
(size_t) where->size); (size_t) where->size);
/* ... then we write */ /* ... then we write */
return _io(&widened, bounce, 1); r = _io(&widened, bounce, 1);
goto_out;
} }
memcpy(buffer, bounce + (where->start - widened.start), memcpy(buffer, bounce + (where->start - widened.start),
(size_t) where->size); (size_t) where->size);
return 1; r = 1;
out:
dm_free(bounce_buf);
return r;
} }
static int _dev_get_size_file(const struct device *dev, uint64_t *size) static int _dev_get_size_file(const struct device *dev, uint64_t *size)