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mapfree: safeguard deleted files

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This commit is contained in:
Thomas Schoebel-Theuer 2022-06-21 14:30:05 +02:00
parent 31401ab85c
commit 8dab12207b
1 changed files with 9 additions and 4 deletions
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13
kernel/lib_mapfree.c
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@ -467,7 +467,12 @@ void mf_dirty_reduce(struct mapfree_info *mf, enum dirty_stage stage, loff_t new
loff_t mf_dirty_length(struct mapfree_info *mf, enum dirty_stage stage)
{
struct dirty_length *dl = _get_dl(mf, stage);
struct dirty_length *dl;
loff_t res = 0;
CHECK_PTR_NULL(mf, done);
dl = _get_dl(mf, stage);
CHECK_PTR_NULL(dl, done);
#ifdef CONFIG_64BIT
/* Avoid locking by assuming that 64bit reads are atomic in itself */
@ -490,16 +495,16 @@ loff_t mf_dirty_length(struct mapfree_info *mf, enum dirty_stage stage)
return real_size;
}
}
return READ_ONCE(dl->dl_length);
res = READ_ONCE(dl->dl_length);
#else /* cannot rely on atomic read of two 32bit values */
loff_t res;
unsigned long flags;
traced_readlock(&dl->dl_lock, flags);
res = dl->dl_length;
traced_readunlock(&dl->dl_lock, flags);
return res;
#endif
done:
return res;
}
////////////////// dirty IOs on the fly //////////////////