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journal: Add a minimum hole size for hole punching

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Let's not bother punching extremely small holes to avoid unnecessary
file fragmentation.
This commit is contained in:
Daan De Meyer 2021-12-15 18:17:22 +01:00
parent 372e8592c6
commit a2799cc556
1 changed files with 5 additions and 0 deletions
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5
src/journal/journald-file.c
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@ -15,6 +15,8 @@
#include "stat-util.h"
#include "sync-util.h"
#define MINIMUM_HOLE_SIZE (1U * 1024U * 1024U / 2U)
static int journald_file_truncate(JournalFile *f) {
uint64_t p;
int r;
@ -66,6 +68,9 @@ static int journald_file_entry_array_punch_hole(JournalFile *f, uint64_t p, uint
(journal_file_entry_array_n_items(&o) - n_unused) * sizeof(le64_t);
sz = p + le64toh(o.object.size) - offset;
if (sz < MINIMUM_HOLE_SIZE)
return 0;
if (fallocate(f->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, offset, sz) < 0)
return log_debug_errno(errno, "Failed to punch hole in entry array of %s: %m", f->path);