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Ensure that the file end is updated in the original file extent if it has been overwritten through a micro log operation.

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This commit is contained in:
Nicolas Tsiftes 2014-02-24 16:58:33 +01:00
parent 3140f36356
commit aef0e9eae6
1 changed files with 11 additions and 3 deletions
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14
core/cfs/cfs-coffee.c
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@ -1155,6 +1155,7 @@ cfs_write(int fd, const void *buf, unsigned size)
int i;
struct log_param lp;
cfs_offset_t bytes_left;
int8_t need_dummy_write;
const char dummy[1] = { 0xff };
#endif
@ -1188,6 +1189,7 @@ cfs_write(int fd, const void *buf, unsigned size)
#else
if(FILE_MODIFIED(file) || fdp->offset < file->end) {
#endif
need_dummy_write = 0;
for(bytes_left = size; bytes_left > 0;) {
lp.offset = fdp->offset;
lp.buf = buf;
@ -1212,13 +1214,19 @@ cfs_write(int fd, const void *buf, unsigned size)
occur while writing log records. */
if(fdp->offset > file->end) {
file->end = fdp->offset;
need_dummy_write = 1;
}
}
}
if(fdp->offset > file->end) {
/* Update the original file's end with a dummy write. */
COFFEE_WRITE(dummy, 1, absolute_offset(file->page, fdp->offset));
if(need_dummy_write) {
/*
* A log record has been written at an offset beyond the original
* extent's end. Consequently, we need to write a dummy value at the
* corresponding end offset in the original extent to ensure that
* the correct file size is calculated when opening the file again.
*/
COFFEE_WRITE(dummy, 1, absolute_offset(file->page, fdp->offset - 1));
}
} else {
#endif /* COFFEE_MICRO_LOGS */