| 1 | |
| 2 |
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| 3 | #include <linux/ceph/ceph_debug.h>
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| 4 |
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| 5 | #include <linux/module.h>
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| 6 | #include <linux/slab.h>
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| 7 |
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| 8 | #include <linux/ceph/buffer.h>
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| 9 | #include <linux/ceph/decode.h>
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| 10 | #include <linux/ceph/libceph.h>
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| 11 |
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| 12 | struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp)
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| 13 | {
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| 14 | struct ceph_buffer *b;
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| 15 |
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| 16 | b = kmalloc_obj(*b, gfp);
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| 17 | if (!b)
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| 18 | return NULL;
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| 19 |
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| 20 | b->vec.iov_base = kvmalloc(len, gfp);
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| 21 | if (!b->vec.iov_base) {
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| 22 | kfree(b);
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| 23 | return NULL;
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| 24 | }
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| 25 |
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| 26 | kref_init(&b->kref);
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| 27 | b->alloc_len = len;
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| 28 | b->vec.iov_len = len;
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| 29 | dout("buffer_new %p\n", b);
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| 30 | return b;
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| 31 | }
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| 32 | EXPORT_SYMBOL(ceph_buffer_new);
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| 33 |
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| 34 | void ceph_buffer_release(struct kref *kref)
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| 35 | {
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| 36 | struct ceph_buffer *b = container_of(kref, struct ceph_buffer, kref);
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| 37 |
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| 38 | dout("buffer_release %p\n", b);
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| 39 | kvfree(b->vec.iov_base);
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| 40 | kfree(b);
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| 41 | }
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| 42 | EXPORT_SYMBOL(ceph_buffer_release);
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| 43 |
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| 44 | int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end)
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| 45 | {
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| 46 | size_t len;
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| 47 |
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| 48 | ceph_decode_need(p, end, sizeof(u32), bad);
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| 49 | len = ceph_decode_32(p);
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| 50 | dout("decode_buffer len %d\n", (int)len);
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| 51 | ceph_decode_need(p, end, len, bad);
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| 52 | *b = ceph_buffer_new(len, GFP_NOFS);
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| 53 | if (!*b)
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| 54 | return -ENOMEM;
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| 55 | ceph_decode_copy(p, (*b)->vec.iov_base, len);
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| 56 | return 0;
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| 57 | bad:
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| 58 | return -EINVAL;
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| 59 | }
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