diff options
Diffstat (limited to 'test/unistd/tst-fallocate.c')
| -rw-r--r-- | test/unistd/tst-fallocate.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/test/unistd/tst-fallocate.c b/test/unistd/tst-fallocate.c new file mode 100644 index 000000000..fc81781bb --- /dev/null +++ b/test/unistd/tst-fallocate.c @@ -0,0 +1,166 @@ +#include <fcntl.h> +#include <sys/stat.h> + +#ifndef TST_FALLOCATE64 +# define stat64 stat +# define fstat64 fstat +# else +# ifndef O_LARGEFILE +# error no O_LARGEFILE but you want to test with LFS enabled +# endif +#endif + +static void do_prepare(void); +static int do_test(void); +#define PREPARE(argc, argv) do_prepare () +#define TEST_FUNCTION do_test () +#include <test-skeleton.c> + +static int fd; +static void +do_prepare (void) +{ + fd = create_temp_file ("tst-fallocate.", NULL); + if (fd == -1) + { + printf ("cannot create temporary file: %m\n"); + exit (1); + } +} + + +static int +do_test (void) +{ + struct stat64 st; + int c; + char garbage[4096]; + blkcnt_t blksb4; + + if (fstat64 (fd, &st) != 0) + { + puts ("1st fstat failed"); + return 1; + } + + if (st.st_size != 0) + { + puts ("file not created with size 0"); + return 1; + } + + /* This is the default mode which is identical to posix_fallocate(). + Note: we need a few extra blocks for FALLOC_FL_PUNCH_HOLE below. + While block sizes vary, we'll assume eight 4K blocks for good measure. */ + if (fallocate (fd, 0, 8 * 4096, 128) != 0) + { + puts ("1st fallocate call failed"); + return 1; + } + + if (fstat64 (fd, &st) != 0) + { + puts ("2nd fstat failed"); + return 1; + } + + if (st.st_size != 8 * 4096 + 128) + { + printf ("file size after 1st fallocate call is %llu, expected %u\n", + (unsigned long long int) st.st_size, 8u * 4096u + 128u); + return 1; + } + + /* Without FALLOC_FL_KEEP_SIZE, this would increaste the size of the file. */ + if (fallocate (fd, FALLOC_FL_KEEP_SIZE, 0, 16 * 4096) != 0) + { + puts ("2nd fallocate call failed"); + return 1; + } + + if (fstat64 (fd, &st) != 0) + { + puts ("3rd fstat failed"); + return 1; + } + + if (st.st_size != 8 * 4096 + 128) + { + printf ("file size changed in 2nd fallocate call to %llu, expected %u\n", + (unsigned long long int) st.st_size, 8u * 4096u + 128u); + return 1; + } + + /* Let's fill up the first eight 4k blocks with 'x' to force some allocations. */ + + memset(garbage, 'x', 4096); + for(c=0; c < 8; c++) + if(write(fd, garbage, 4096) == -1) + { + puts ("write failed"); + return 1; + } + + if (fstat64 (fd, &st) != 0) + { + puts ("4th fstat failed"); + return 1; + } + + blksb4 = st.st_blocks; + + /* Let's punch a hole in the entire file, turning it effectively into a sparse file. */ + if (fallocate (fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0, 8 * 4096 + 128) != 0) + { + puts ("3rd fallocate call failed"); + return 1; + } + + if (fstat64 (fd, &st) != 0) + { + puts ("5th fstat failed"); + return 1; + } + + if (st.st_size != 8 * 4096 + 128) + { + printf ("file size after 3rd fallocate call is %llu, expected %u\n", + (unsigned long long int) st.st_size, 8u * 4096u + 128u); + return 1; + } + + /* The number of allocated blocks should decrease. I hope this works on + all filesystems! */ + if (st.st_blocks >= blksb4) + { + printf ("number of blocks after 3rd fallocate call is %lu, expected less than %lu\n", + (unsigned long int) st.st_blocks, blksb4); + return 1; + } + +#ifdef TST_FALLOCATE64 + /* We'll just do a mode = 0 test for fallocate64() */ + if (fallocate64 (fd, 0, 4097ULL, 4294967295ULL + 2ULL) != 0) + { + puts ("1st fallocate64 call failed"); + return 1; + } + + if (fstat64 (fd, &st) != 0) + { + puts ("6th fstat failed"); + return 1; + } + + if (st.st_size != 4097ULL + 4294967295ULL + 2ULL) + { + printf ("file size after 1st fallocate64 call is %llu, expected %llu\n", + (unsigned long long int) st.st_size, 4097ULL + 4294967295ULL + 2ULL); + return 1; + } +#endif + close (fd); + + return 0; +} + |