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Add first prototype for abstracting librados API.
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Marco van Wieringen
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Feb 17, 2015
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,251 @@ | ||
| /* | ||
| BAREOS® - Backup Archiving REcovery Open Sourced | ||
| Copyright (C) 2014-2014 Bareos GmbH & Co. KG | ||
| This program is Free Software; you can redistribute it and/or | ||
| modify it under the terms of version three of the GNU Affero General Public | ||
| License as published by the Free Software Foundation and included | ||
| in the file LICENSE. | ||
| This program is distributed in the hope that it will be useful, but | ||
| WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| General Public License for more details. | ||
| You should have received a copy of the GNU Affero General Public License | ||
| along with this program; if not, write to the Free Software | ||
| Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | ||
| 02110-1301, USA. | ||
| */ | ||
| /* | ||
| * CEPH (librados) API device abstraction. | ||
| * | ||
| * Marco van Wieringen, February 2014 | ||
| */ | ||
|
|
||
| #include "bareos.h" | ||
|
|
||
| #ifdef HAVE_RADOS | ||
| #include "stored.h" | ||
| #include "rados_device.h" | ||
|
|
||
| /* | ||
| * Open a volume using librados. | ||
| */ | ||
| int rados_device::d_open(const char *pathname, int flags, int mode) | ||
| { | ||
| if (!m_rados_configstring) { | ||
| char *bp; | ||
|
|
||
| m_rados_configstring = bstrdup(dev_name); | ||
| bp = strchr(m_rados_configstring, ':'); | ||
| if (!bp) { | ||
| Mmsg1(errmsg, _("Unable to parse device %s.\n"), dev_name); | ||
| Emsg0(M_FATAL, 0, errmsg); | ||
| goto bail_out; | ||
| } | ||
|
|
||
| *bp++ = '\0'; | ||
| m_rados_conffile = m_rados_configstring; | ||
| m_rados_poolname = bp; | ||
| } | ||
|
|
||
| if (!m_cluster_initialized) { | ||
| if (rados_create(&m_cluster, NULL) < 0) { | ||
| berrno be; | ||
|
|
||
| Mmsg1(errmsg, _("Unable to create RADOS cluster: ERR=%s\n"), be.bstrerror()); | ||
| Emsg0(M_FATAL, 0, errmsg); | ||
| goto bail_out; | ||
| } | ||
|
|
||
| if (rados_conf_read_file(m_cluster, m_rados_conffile) < 0) { | ||
| berrno be; | ||
|
|
||
| Mmsg2(errmsg, _("Unable to read RADOS config %s: ERR=%s\n"), m_rados_conffile, be.bstrerror()); | ||
| Emsg0(M_FATAL, 0, errmsg); | ||
| rados_shutdown(m_cluster); | ||
| goto bail_out; | ||
| } | ||
|
|
||
| if (rados_connect(m_cluster) < 0) { | ||
| berrno be; | ||
|
|
||
| Mmsg1(errmsg, _("Unable to connect to RADOS cluster: ERR=%s\n"), be.bstrerror()); | ||
| Emsg0(M_FATAL, 0, errmsg); | ||
| rados_shutdown(m_cluster); | ||
| goto bail_out; | ||
| } | ||
|
|
||
| m_cluster_initialized = true; | ||
| } | ||
|
|
||
| if (!m_ctx) { | ||
| if (rados_ioctx_create(m_cluster, m_rados_poolname, &m_ctx) < 0) { | ||
| berrno be; | ||
|
|
||
| Mmsg2(errmsg, _("Unable to create RADOS IO context for pool %s: ERR=%s\n"), m_rados_poolname, be.bstrerror()); | ||
| Emsg0(M_FATAL, 0, errmsg); | ||
| goto bail_out; | ||
| } | ||
| } | ||
|
|
||
| m_offset = 0; | ||
|
|
||
| return 0; | ||
|
|
||
| bail_out: | ||
| return -1; | ||
| } | ||
|
|
||
| /* | ||
| * Read data from a volume using librados. | ||
| */ | ||
| ssize_t rados_device::d_read(int fd, void *buffer, size_t count) | ||
| { | ||
| if (m_ctx) { | ||
| int nr_read; | ||
|
|
||
| nr_read = rados_read(m_ctx, getVolCatName(), (char *)buffer, count, m_offset); | ||
| if (nr_read > 0) { | ||
| m_offset += nr_read; | ||
| } | ||
| return nr_read; | ||
| } else { | ||
| errno = EBADF; | ||
| return -1; | ||
| } | ||
| } | ||
|
|
||
| /* | ||
| * Write data to a volume using librados. | ||
| */ | ||
| ssize_t rados_device::d_write(int fd, const void *buffer, size_t count) | ||
| { | ||
| if (m_ctx) { | ||
| int nr_written; | ||
|
|
||
| nr_written = rados_write(m_ctx, getVolCatName(), (char *)buffer, count, m_offset); | ||
| if (nr_written > 0) { | ||
| m_offset += nr_written; | ||
| } | ||
| return nr_written; | ||
| } else { | ||
| errno = EBADF; | ||
| return -1; | ||
| } | ||
| } | ||
|
|
||
| int rados_device::d_close(int fd) | ||
| { | ||
| /* | ||
| * Destroy the IOcontext. | ||
| */ | ||
| if (m_ctx) { | ||
| rados_ioctx_destroy(m_ctx); | ||
| m_ctx = NULL; | ||
| } else { | ||
| errno = EBADF; | ||
| return -1; | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| int rados_device::d_ioctl(int fd, ioctl_req_t request, char *op) | ||
| { | ||
| return -1; | ||
| } | ||
|
|
||
| boffset_t rados_device::d_lseek(DCR *dcr, boffset_t offset, int whence) | ||
| { | ||
| switch (whence) { | ||
| case SEEK_SET: | ||
| m_offset = offset; | ||
| break; | ||
| case SEEK_CUR: | ||
| m_offset += offset; | ||
| break; | ||
| case SEEK_END: { | ||
| uint64_t object_size; | ||
| time_t object_mtime; | ||
|
|
||
| if (rados_stat(m_ctx, getVolCatName(), &object_size, &object_mtime) == 0) { | ||
| m_offset = object_size + offset; | ||
| } else { | ||
| return -1; | ||
| } | ||
| break; | ||
| } | ||
| default: | ||
| return -1; | ||
| } | ||
|
|
||
| return m_offset; | ||
| } | ||
|
|
||
| bool rados_device::d_truncate(DCR *dcr) | ||
| { | ||
| if (m_ctx) { | ||
| uint64_t object_size; | ||
| time_t object_mtime; | ||
|
|
||
| if (rados_trunc(m_ctx, getVolCatName(), 0) != 0) { | ||
| berrno be; | ||
|
|
||
| Mmsg2(errmsg, _("Unable to truncate device %s. ERR=%s\n"), | ||
| print_name(), be.bstrerror()); | ||
| Emsg0(M_FATAL, 0, errmsg); | ||
| return false; | ||
| } | ||
|
|
||
| if (rados_stat(m_ctx, getVolCatName(), &object_size, &object_mtime) == 0) { | ||
| berrno be; | ||
|
|
||
| Mmsg2(errmsg, _("Unable to stat volume %s. ERR=%s\n"), getVolCatName(), be.bstrerror()); | ||
| return false; | ||
| } | ||
|
|
||
| if (object_size != 0) { /* rados_trunc() didn't work. */ | ||
| if (rados_remove(m_ctx, getVolCatName()) != 0) { | ||
| berrno be; | ||
|
|
||
| Mmsg2(errmsg, _("Unable to remove volume %s. ERR=%s\n"), getVolCatName(), be.bstrerror()); | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| m_offset = 0; | ||
| } | ||
|
|
||
| return true; | ||
| } | ||
|
|
||
| rados_device::~rados_device() | ||
| { | ||
| if (m_ctx) { | ||
| rados_ioctx_destroy(m_ctx); | ||
| m_ctx = NULL; | ||
| } | ||
|
|
||
| if (m_cluster_initialized) { | ||
| rados_shutdown(&m_cluster); | ||
| m_cluster_initialized = false; | ||
| } | ||
|
|
||
| if (m_rados_configstring) { | ||
| free(m_rados_configstring); | ||
| } | ||
| } | ||
|
|
||
| rados_device::rados_device() | ||
| { | ||
| m_fd = -1; | ||
| m_rados_configstring = NULL; | ||
| m_rados_conffile = NULL; | ||
| m_rados_poolname = NULL; | ||
| m_cluster_initialized = false; | ||
| m_ctx = NULL; | ||
| } | ||
| #endif |
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