forked from Minki/linux
a421ef3030
Support for GFP_NO{FS,IO} and __GFP_NOFAIL has been implemented by
previous patches so we can allow the support for kvmalloc. This will
allow some external users to simplify or completely remove their
helpers.
GFP_NOWAIT semantic hasn't been supported so far but it hasn't been
explicitly documented so let's add a note about that.
ceph_kvmalloc is the first helper to be dropped and changed to kvmalloc.
Link: https://lkml.kernel.org/r/20211122153233.9924-5-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Neil Brown <neilb@suse.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/ceph/ceph_debug.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/ceph/buffer.h>
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#include <linux/ceph/decode.h>
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#include <linux/ceph/libceph.h> /* for kvmalloc */
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struct ceph_buffer *ceph_buffer_new(size_t len, 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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b->vec.iov_base = kvmalloc(len, gfp);
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if (!b->vec.iov_base) {
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kfree(b);
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return NULL;
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}
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kref_init(&b->kref);
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b->alloc_len = len;
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b->vec.iov_len = len;
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dout("buffer_new %p\n", b);
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return b;
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}
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EXPORT_SYMBOL(ceph_buffer_new);
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void ceph_buffer_release(struct kref *kref)
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{
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struct ceph_buffer *b = container_of(kref, struct ceph_buffer, kref);
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dout("buffer_release %p\n", b);
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kvfree(b->vec.iov_base);
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kfree(b);
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}
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EXPORT_SYMBOL(ceph_buffer_release);
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int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end)
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{
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size_t len;
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ceph_decode_need(p, end, sizeof(u32), bad);
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len = ceph_decode_32(p);
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dout("decode_buffer len %d\n", (int)len);
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ceph_decode_need(p, end, len, bad);
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*b = ceph_buffer_new(len, GFP_NOFS);
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if (!*b)
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return -ENOMEM;
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ceph_decode_copy(p, (*b)->vec.iov_base, len);
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return 0;
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bad:
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return -EINVAL;
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}
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