forked from luck/tmp_suning_uos_patched
c30dbb9cc7
struct ceph_buffer is a simple ref-counted buffer. We transparently choose between kmalloc for small buffers and vmalloc for large ones. This is currently used only for allocating memory for xattr data. Signed-off-by: Sage Weil <sage@newdream.net>
35 lines
639 B
C
35 lines
639 B
C
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#include "ceph_debug.h"
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#include "buffer.h"
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struct ceph_buffer *ceph_buffer_new(gfp_t gfp)
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{
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struct ceph_buffer *b;
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b = kmalloc(sizeof(*b), gfp);
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if (!b)
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return NULL;
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atomic_set(&b->nref, 1);
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b->vec.iov_base = NULL;
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b->vec.iov_len = 0;
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b->alloc_len = 0;
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return b;
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}
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int ceph_buffer_alloc(struct ceph_buffer *b, int len, gfp_t gfp)
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{
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b->vec.iov_base = kmalloc(len, gfp | __GFP_NOWARN);
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if (b->vec.iov_base) {
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b->is_vmalloc = false;
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} else {
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b->vec.iov_base = __vmalloc(len, gfp, PAGE_KERNEL);
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b->is_vmalloc = true;
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}
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if (!b->vec.iov_base)
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return -ENOMEM;
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b->alloc_len = len;
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b->vec.iov_len = len;
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return 0;
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}
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