This project forked from utsaslab/splitfs
SplitFS: persistent-memory file system that reduces software overhead (SOSP 2019)
Home Page: https://www.cs.utexas.edu/~vijay/papers/sosp19-splitfs.pdf
License: Other
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Lets say the DR_SIZE is 512MB.
If we try to append to a file that is lets say 512MB then the write fails.
This is because of the following
Relevant pointers to the code:
Consider an application that does the following in order
In the above scenario the appends are not getting relinked.
Snippet to reproduce the issue:
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <sys/wait.h>
#define FILE_PATH "/mnt/pmem_emul/test.txt"
int main() {
int fd, result;
char buf[] = "Hello world!\n";
fd = open(FILE_PATH, O_CREAT | O_RDWR);
result = write(fd, buf, strlen(buf));
assert(result>=0);
sync();
//close(fd);
}
This scenario fails
lsleek and write try to overwrite the appended contents without doing an fsync/closeCode snippet to reproduce the issue.
#include <stdio.h>
#include <fcntl.h>
#include <assert.h>
#include <unistd.h>
#include <string.h>
#define FILE_PATH "/mnt/pmem_emul/test.txt"
int main() {
// Create the file
int fd = open(FILE_PATH, O_CREAT | O_RDWR);
char buf[] = "Hello";
// Write something onto it
int ret = write(fd, buf, strlen(buf));
assert(fd>=0);
assert(ret>=0);
// Open it again
lseek(fd, 0, SEEK_SET);
// Write a few byes
char buf2[] = "wor";
ret = write(fd, buf2, strlen(buf2));
assert(ret>=0);
close(fd);
}
This scenario fails when the read is attempted before relink.
This involves doing a seek which I guess is not handled by SplitFS
This sequence of operations results in incorrect behaviour.
It does the overwrite but fails to append
Hello is the content)World)The result in the file is then - HelWo instead of HelWorld
Code snippet to reproduce the issue:
#include <stdio.h>
#include <fcntl.h>
#include <assert.h>
#include <unistd.h>
#include <string.h>
#define FILE_PATH "/mnt/pmem_emul/test.txt"
int main() {
// Create the file
int fd = open(FILE_PATH, O_CREAT | O_RDWR);
char buf[] = "Hello";
// Write something onto it
int ret = write(fd, buf, strlen(buf));
assert(fd>=0);
assert(ret>=0);
close(fd);
fd = open(FILE_PATH, O_RDWR);
assert(fd>=0);
// Seek to a valid offset within the file size.
lseek(fd, 3, SEEK_SET);
// Write a few byes
char buf2[] = "world";
ret = write(fd, buf2, strlen(buf2));
assert(ret>=0);
close(fd);
}
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