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mm/failslab.c
1.37 KB
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// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/fault-inject.h> |
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#include <linux/slab.h> |
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#include <linux/mm.h> #include "slab.h" |
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static struct { struct fault_attr attr; |
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bool ignore_gfp_reclaim; |
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bool cache_filter; |
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} failslab = { .attr = FAULT_ATTR_INITIALIZER, |
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.ignore_gfp_reclaim = true, |
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.cache_filter = false, |
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}; |
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bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags) |
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{ |
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/* No fault-injection for bootstrap cache */ if (unlikely(s == kmem_cache)) return false; |
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if (gfpflags & __GFP_NOFAIL) return false; |
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if (failslab.ignore_gfp_reclaim && (gfpflags & __GFP_DIRECT_RECLAIM)) |
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return false; |
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if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB)) |
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return false; |
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return should_fail(&failslab.attr, s->object_size); |
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} static int __init setup_failslab(char *str) { return setup_fault_attr(&failslab.attr, str); } __setup("failslab=", setup_failslab); #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS |
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static int __init failslab_debugfs_init(void) { |
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struct dentry *dir; |
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umode_t mode = S_IFREG | 0600; |
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dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr); if (IS_ERR(dir)) return PTR_ERR(dir); |
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debugfs_create_bool("ignore-gfp-wait", mode, dir, &failslab.ignore_gfp_reclaim); debugfs_create_bool("cache-filter", mode, dir, &failslab.cache_filter); |
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return 0; |
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} late_initcall(failslab_debugfs_init); #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ |