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7c673cae FG |
1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | /* | |
4 | * Ceph - scalable distributed file system | |
5 | * | |
6 | * Copyright (C) 2014 Inktank, Inc | |
7 | * | |
8 | * This is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License version 2.1, as published by the Free Software | |
11 | * Foundation. See file COPYING. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include "XfsFileStoreBackend.h" | |
16 | ||
17 | #include <errno.h> | |
18 | #include <fcntl.h> | |
19 | #include <sys/ioctl.h> | |
20 | #include <sys/stat.h> | |
21 | #include <unistd.h> | |
22 | #include <sys/utsname.h> | |
23 | ||
24 | #include <xfs/xfs.h> | |
25 | ||
26 | #include "common/errno.h" | |
27 | #include "common/linux_version.h" | |
11fdf7f2 | 28 | #include "include/ceph_assert.h" |
7c673cae FG |
29 | #include "include/compat.h" |
30 | ||
31 | #define dout_context cct() | |
32 | #define dout_subsys ceph_subsys_filestore | |
33 | #undef dout_prefix | |
34 | #define dout_prefix *_dout << "xfsfilestorebackend(" << get_basedir_path() << ") " | |
35 | ||
36 | XfsFileStoreBackend::XfsFileStoreBackend(FileStore *fs): | |
37 | GenericFileStoreBackend(fs), m_has_extsize(false) { } | |
38 | ||
39 | /* | |
40 | * Set extsize attr on a file to val. Should be a free-standing | |
41 | * function, but dout_prefix expanding to a call to get_basedir_path() | |
42 | * protected member function won't let it. | |
43 | */ | |
44 | int XfsFileStoreBackend::set_extsize(int fd, unsigned int val) | |
45 | { | |
46 | struct fsxattr fsx; | |
47 | struct stat sb; | |
48 | int ret; | |
49 | ||
50 | if (fstat(fd, &sb) < 0) { | |
51 | ret = -errno; | |
52 | dout(0) << "set_extsize: fstat: " << cpp_strerror(ret) << dendl; | |
53 | return ret; | |
54 | } | |
55 | if (!S_ISREG(sb.st_mode)) { | |
56 | dout(0) << "set_extsize: invalid target file type" << dendl; | |
57 | return -EINVAL; | |
58 | } | |
59 | ||
60 | if (ioctl(fd, XFS_IOC_FSGETXATTR, &fsx) < 0) { | |
61 | ret = -errno; | |
62 | dout(0) << "set_extsize: FSGETXATTR: " << cpp_strerror(ret) << dendl; | |
63 | return ret; | |
64 | } | |
65 | ||
66 | // already set? | |
67 | if ((fsx.fsx_xflags & XFS_XFLAG_EXTSIZE) && fsx.fsx_extsize == val) | |
68 | return 0; | |
69 | ||
70 | // xfs won't change extent size if any extents are allocated | |
71 | if (fsx.fsx_nextents != 0) | |
72 | return 0; | |
73 | ||
74 | fsx.fsx_xflags |= XFS_XFLAG_EXTSIZE; | |
75 | fsx.fsx_extsize = val; | |
76 | ||
77 | if (ioctl(fd, XFS_IOC_FSSETXATTR, &fsx) < 0) { | |
78 | ret = -errno; | |
79 | dout(0) << "set_extsize: FSSETXATTR: " << cpp_strerror(ret) << dendl; | |
80 | return ret; | |
81 | } | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | int XfsFileStoreBackend::detect_features() | |
87 | { | |
88 | int ret; | |
89 | ||
90 | ret = GenericFileStoreBackend::detect_features(); | |
91 | if (ret < 0) | |
92 | return ret; | |
93 | ||
94 | // extsize? | |
95 | int fd = ::openat(get_basedir_fd(), "extsize_test", O_CREAT|O_WRONLY, 0600); | |
96 | if (fd < 0) { | |
97 | ret = -errno; | |
98 | dout(0) << "detect_feature: failed to create test file for extsize attr: " | |
99 | << cpp_strerror(ret) << dendl; | |
100 | goto out; | |
101 | } | |
102 | if (::unlinkat(get_basedir_fd(), "extsize_test", 0) < 0) { | |
103 | ret = -errno; | |
104 | dout(0) << "detect_feature: failed to unlink test file for extsize attr: " | |
105 | << cpp_strerror(ret) << dendl; | |
106 | goto out_close; | |
107 | } | |
108 | ||
109 | if (cct()->_conf->filestore_xfs_extsize) { | |
110 | ret = set_extsize(fd, 1U << 15); // a few pages | |
111 | if (ret) { | |
112 | ret = 0; | |
113 | dout(0) << "detect_feature: failed to set test file extsize, assuming extsize is NOT supported" << dendl; | |
114 | goto out_close; | |
115 | } | |
116 | ||
117 | // make sure we have 3.5 or newer, which includes this fix | |
118 | // aff3a9edb7080f69f07fe76a8bd089b3dfa4cb5d | |
119 | // for this set_extsize bug | |
120 | // http://oss.sgi.com/bugzilla/show_bug.cgi?id=874 | |
121 | int ver = get_linux_version(); | |
122 | if (ver == 0) { | |
123 | dout(0) << __func__ << ": couldn't verify extsize not buggy, disabling extsize" << dendl; | |
124 | m_has_extsize = false; | |
125 | } else if (ver < KERNEL_VERSION(3, 5, 0)) { | |
126 | dout(0) << __func__ << ": disabling extsize, your kernel < 3.5 and has buggy extsize ioctl" << dendl; | |
127 | m_has_extsize = false; | |
128 | } else { | |
129 | dout(0) << __func__ << ": extsize is supported and your kernel >= 3.5" << dendl; | |
130 | m_has_extsize = true; | |
131 | } | |
132 | } else { | |
133 | dout(0) << "detect_feature: extsize is disabled by conf" << dendl; | |
134 | } | |
135 | ||
136 | out_close: | |
137 | TEMP_FAILURE_RETRY(::close(fd)); | |
138 | out: | |
139 | return ret; | |
140 | } | |
141 | ||
142 | int XfsFileStoreBackend::set_alloc_hint(int fd, uint64_t hint) | |
143 | { | |
144 | if (!m_has_extsize) | |
145 | return -EOPNOTSUPP; | |
146 | ||
11fdf7f2 | 147 | ceph_assert(hint < UINT_MAX); |
7c673cae FG |
148 | return set_extsize(fd, hint); |
149 | } |