3c890c48a9
Added some comments to clarify how Coffee works internally
2010-01-19 16:18:34 +00:00
d2655eac7a
make watchdog management slightly more abstract to simplify porting
2010-01-14 21:16:58 +00:00
8acea82207
Set a file mode in the third argument when calling open() with O_CREAT in
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the flags. Required by IEEE Std 1003.1, 2004 Edition.
2009-08-10 09:50:55 +00:00
c1b7375a5a
*** empty log message ***
2009-07-23 16:13:48 +00:00
62b380b0a6
Fixed a bug with reading to far in get_record index. Thanks to Darren Moore for reporting this.
2009-07-16 11:58:44 +00:00
906717a333
* isolate only pages in the last sector
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* set max_pages to 0 when calling remove_by_page to prevent file starvation.
* when allocating files, only update next_free if the allocated file starts at next_free.
Thanks to Darren Moore (CSIRO) for suggesting the first two of the
three changes.
2009-07-09 22:16:22 +00:00
c872a86653
undo accidental enabling of debug output.
2009-06-29 13:33:12 +00:00
1e0ca9ceac
Made the use of micro logs configurable to make file modifications
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more efficient on storage types that support inline updates.
The sky platform uses logs, and the native platform uses no logs.
2009-06-29 13:30:16 +00:00
53a8acc49a
cleared debug flag.
2009-06-10 15:13:37 +00:00
349e14abd4
fixed GC bug with big files and unwanted buffer overwrite bug.
2009-06-10 15:03:35 +00:00
d9b75b2fda
stop the watchdog while merging.
2009-05-26 14:27:06 +00:00
88766d8740
use unsigned for sector count type.
2009-05-25 22:10:04 +00:00
2978270e43
decreased the code size to less than 5000 bytes. (msp430 code)
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improved clarity in read and write code.
added negative offset check in cfs_seek().
removed unnecessary multiplication.
2009-05-13 13:27:19 +00:00
995e788d73
Fixed append->modify->append bug.
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Approximately doubled the speed of file reservations.
Reduced the compiled code size by about 100 bytes by removing redundant code.
2009-05-11 16:35:49 +00:00
55ec3093ec
removed complicated and mostly unused EOF hint code.
2009-05-04 22:30:32 +00:00
8e52b1bcfd
made the documentation more clear.
2009-05-04 22:29:48 +00:00
17fa2f1618
make sure that page isolation is called after erasing a sector in reluctant GC.
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simplified the GC logic a bit.
2009-04-29 13:15:59 +00:00
3f205a1413
reluctant gc will now wait until the sector has no free pages
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before erasing the sector.
2009-04-13 22:26:31 +00:00
4507891ed5
made gc on removal configurable since it decreases wear levelling.
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cleaned up some code.
2009-04-02 14:20:04 +00:00
1425537a13
Introduced two garbage collection mode: greedy and reluctant.
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The greedy GC mode attempts to erase as many sectors as possible, and
it is therefore a slow operation, since the flash driver must wait
for about a second after erasing one sector. The former behavior was
to always do a greedy GC if file reservations fails due to lack of space.
The new reluctant GC stops after erasing one sector, and therefore
we often do not have to wait if there is no file system operation
in the time while the sector is being erased. We call the garbage collector
using this mode when removing a file that is not a micro log file, since
the remove function is called recursively for micro log files that are
erased because the corresponding ordinary file is erased.
This change increases the coffee test (examples/sky/test-coffee.c) speed
from 9 to 5 seconds.
2009-04-02 11:22:23 +00:00
6a6bb53f2e
merged files must always inherit the old file end.
2009-03-26 15:57:52 +00:00
04ccf215e4
dereference gc_wait
2009-03-26 15:45:55 +00:00
8785bee644
avoid repetitive garbage collection if no files have been deleted since
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the last try.
2009-03-26 12:36:10 +00:00
bffbb06d4a
corrected GC page isolation loop.
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adjusted cfs_coffee_reserve signature to use cfs_offset_t instead of uint32_t.
made cfs_coffee_format also to clear *next_free.
2009-03-20 15:15:43 +00:00
b7bdfe8daf
bugfixes:
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* set invalid page on all removed files which have cache entries.
* update file cache entries earlier to prevent overwrites.
2009-03-19 20:44:43 +00:00
545c0c506e
Switched cfs offset type to signed int to allow backward movements with cfs_seek.
2009-03-01 12:28:39 +00:00
47d70f2ae3
Switched name to CFS_CONF_OFFSET_TYPE to emphasize that it is a configurable option.
2009-03-01 12:00:00 +00:00
63b89a67fe
* cfs_opendir in Coffee now accepts any name.
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* refer to the documentation of each whence parameter. Old documentation didn't consider negative movements either.
2009-02-28 13:40:25 +00:00
938f151a66
Allow to override the whence macros individually - just like the open flags.
2009-02-28 11:39:02 +00:00
aaa9d62304
fixed cfs_seek signature.
2009-02-27 14:52:52 +00:00
6615e39e27
switched unsigned int to cfs_offset_t
2009-02-27 14:50:35 +00:00
90e8016906
file end check must be against fdp->offset.
2009-02-27 14:35:12 +00:00
3191a2568c
Major API change:
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1. Introduced a cfs_offset_t type that designates file offsets. unsigned int
was insufficient on several platforms with non-volatile storage that exceed
the capacity of unsigned int.
2. Switched cfs_seek signature to POSIX style with a "whence" parameter.
2009-02-27 14:25:37 +00:00
5e038640e2
fixed error in last commit: second character must terminate
2009-02-27 13:21:59 +00:00
a258be684f
permit the current directory name "." to be used in cfs_opendir.
2009-02-27 13:19:04 +00:00
2295df7246
The text suggested that only append operations were supported.
2009-02-27 10:54:08 +00:00
2e12c2408e
bug fix: removed possible null pointer dereference.
2009-02-25 23:59:26 +00:00
bc7c90bb9f
doubled the speed of uncached file openings.
2009-02-22 15:19:31 +00:00
957ae56b13
broke out the essence of the search algorithm to a separate function.
2009-02-19 21:35:38 +00:00
07c50cc200
corrected file cache status checks in previous commit.
2009-02-17 18:50:29 +00:00
d029dd8240
cleaned up mostly the GC code.
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made EOF hints optional.
default build is now ~500 bytes smaller.
2009-02-17 16:56:32 +00:00
883d10e136
GC fix: isolated pages must always be allocated.
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page allocation: increased utilization because the algorithm failed to
count all space before.
style: renamed and simplified some code and names.
2009-02-14 19:09:17 +00:00
b8f3dca765
fixed merge_log bug and space allocation error with isolated pages.
2009-02-12 11:24:22 +00:00
98f7f9a06a
sizeof on coffee_fd_set is no longer suitable since it has become a
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pointer.
2009-02-09 12:02:10 +00:00
4f7f3c97b5
* added coffee_files to the protected memory needed during cfs-based checkpointing operations
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* renamed cfs_coffee_get_fd_set() to cfs_coffee_get_protected_memory() to highlight that not only fd_set is protected
2009-02-09 10:08:26 +00:00
d0a546b049
A long refactoring session yielded the following.
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Technical changes:
* Factored out file specific information from the file descriptor
structure into a new file structure.
- Useful file metadata can be stored after the file is closed.
- File descriptors become much smaller.
- Significantly reduces the need to scan for the file end.
* Use correct types in all function signatures.
* Removed the directory cache.
Results:
* Enormous speed increase when opening cached files (10x-20x.)
* Multiple fd:s pointing to the same file have the correct semantics.
* About 100 bytes smaller ROM size.
* Slightly smaller static RAM size.
2009-02-08 17:08:13 +00:00
fda75c4c08
Use the right type for pages in the directory cache. This makes the
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cache much smaller on most platforms.
2009-02-03 16:21:53 +00:00
4b56200586
documented the new function that helps sensornet checkpointing to protect
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file descriptors while rolling back state.
2009-01-29 18:24:58 +00:00
8f462b9a52
zeroed debug flag
2009-01-23 17:28:09 +00:00
7e5047012b
added function for getting coffee's fd_set address and size
2009-01-23 16:27:49 +00:00
nvt-se
dak664
oliverschmidt
fros4943