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Added ASCII art to make this clearer.

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Jeremy.
(This used to be commit 31c0dd7e21)
This commit is contained in:
Jeremy Allison 2002-10-03 19:05:36 +00:00
parent a4f7b7bec1
commit 474340e440
1 changed files with 73 additions and 1 deletions
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74
source3/smbd/fileio.c
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@ -256,6 +256,18 @@ nonop=%u allocated=%u active=%u direct=%u perfect=%u readhits=%u\n",
if ((pos >= wcp->offset) && (pos <= wcp->offset + wcp->data_size)) {
/* ASCII art.... JRA.
+--------------+-----
| Cached data | Rest of allocated cache buffer....
+--------------+-----
+-------------------+
| Data to write |
+-------------------+
*/
/*
* Start of write overlaps or abutts the existing data.
*/
@ -305,6 +317,18 @@ nonop=%u allocated=%u active=%u direct=%u perfect=%u readhits=%u\n",
} else if ((pos < wcp->offset) && (pos + n > wcp->offset) &&
(pos + n <= wcp->offset + wcp->alloc_size)) {
/* ASCII art.... JRA.
+---------------+
| Cache buffer |
+---------------+
+-------------------+
| Data to write |
+-------------------+
*/
/*
* End of write overlaps the existing data.
*/
@ -350,6 +374,20 @@ nonop=%u allocated=%u active=%u direct=%u perfect=%u readhits=%u\n",
(pos > wcp->offset + wcp->data_size) &&
(pos < wcp->offset + wcp->alloc_size) ) {
/* ASCII art.... JRA.
End of file ---->|
+---------------+---------------+
| Cached data | Cache buffer |
+---------------+---------------+
+-------------------+
| Data to write |
+-------------------+
*/
/*
* Non-contiguous write part of which fits within
* the cache buffer and is extending the file
@ -413,7 +451,41 @@ nonop=%u allocated=%u active=%u direct=%u perfect=%u readhits=%u\n",
} else {
/*
/* ASCII art..... JRA.
Case 1).
+---------------+---------------+
| Cached data | Cache buffer |
+---------------+---------------+
+-------------------+
| Data to write |
+-------------------+
Case 2).
+---------------+---------------+
| Cached data | Cache buffer |
+---------------+---------------+
+-------------------+
| Data to write |
+-------------------+
Case 3).
+---------------+---------------+
| Cached data | Cache buffer |
+---------------+---------------+
+-----------------------------------------------------+
| Data to write |
+-----------------------------------------------------+
*/
/*
* Write is bigger than buffer, or there is no overlap on the
* low or high ends.
*/