Mercurial > hg > nginx
annotate src/os/unix/ngx_shmem.c @ 7668:0a04e5e4c40b
Large block sizes on Linux are now ignored (ticket #1168).
NFS on Linux is known to report wsize as a block size (in both f_bsize
and f_frsize, both in statfs() and statvfs()). On the other hand,
typical file system block sizes on Linux (ext2/ext3/ext4, XFS) are limited
to pagesize. (With FAT, block sizes can be at least up to 512k in
extreme cases, but this doesn't really matter, see below.)
To avoid too aggressive cache clearing on NFS volumes on Linux, block
sizes larger than pagesize are now ignored.
Note that it is safe to ignore large block sizes. Since 3899:e7cd13b7f759
(1.0.1) cache size is calculated based on fstat() st_blocks, and rounding
to file system block size is preserved mostly for Windows.
Note well that on other OSes valid block sizes seen are at least up
to 65536. In particular, UFS on FreeBSD is known to work well with block
and fragment sizes set to 65536.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Mon, 22 Jun 2020 18:02:58 +0300 |
| parents | d620f497c50f |
| children |
| rev | line source |
|---|---|
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
| 4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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| 469 | 12 #if (NGX_HAVE_MAP_ANON) |
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13 |
| 605 | 14 ngx_int_t |
| 15 ngx_shm_alloc(ngx_shm_t *shm) | |
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16 { |
| 639 | 17 shm->addr = (u_char *) mmap(NULL, shm->size, |
| 18 PROT_READ|PROT_WRITE, | |
| 19 MAP_ANON|MAP_SHARED, -1, 0); | |
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20 |
| 605 | 21 if (shm->addr == MAP_FAILED) { |
| 22 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, | |
| 23 "mmap(MAP_ANON|MAP_SHARED, %uz) failed", shm->size); | |
| 24 return NGX_ERROR; | |
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25 } |
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26 |
| 605 | 27 return NGX_OK; |
| 28 } | |
| 29 | |
| 30 | |
| 31 void | |
| 32 ngx_shm_free(ngx_shm_t *shm) | |
| 33 { | |
| 639 | 34 if (munmap((void *) shm->addr, shm->size) == -1) { |
| 605 | 35 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
| 36 "munmap(%p, %uz) failed", shm->addr, shm->size); | |
| 37 } | |
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38 } |
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39 |
| 469 | 40 #elif (NGX_HAVE_MAP_DEVZERO) |
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41 |
| 605 | 42 ngx_int_t |
| 43 ngx_shm_alloc(ngx_shm_t *shm) | |
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44 { |
| 605 | 45 ngx_fd_t fd; |
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46 |
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47 fd = open("/dev/zero", O_RDWR); |
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48 |
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49 if (fd == -1) { |
| 605 | 50 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
| 467 | 51 "open(\"/dev/zero\") failed"); |
| 605 | 52 return NGX_ERROR; |
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53 } |
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54 |
| 639 | 55 shm->addr = (u_char *) mmap(NULL, shm->size, PROT_READ|PROT_WRITE, |
| 56 MAP_SHARED, fd, 0); | |
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57 |
| 605 | 58 if (shm->addr == MAP_FAILED) { |
| 59 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, | |
| 60 "mmap(/dev/zero, MAP_SHARED, %uz) failed", shm->size); | |
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61 } |
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62 |
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63 if (close(fd) == -1) { |
| 605 | 64 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
| 467 | 65 "close(\"/dev/zero\") failed"); |
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66 } |
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67 |
| 605 | 68 return (shm->addr == MAP_FAILED) ? NGX_ERROR : NGX_OK; |
| 69 } | |
| 70 | |
| 71 | |
| 72 void | |
| 73 ngx_shm_free(ngx_shm_t *shm) | |
| 74 { | |
| 639 | 75 if (munmap((void *) shm->addr, shm->size) == -1) { |
| 605 | 76 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
| 77 "munmap(%p, %uz) failed", shm->addr, shm->size); | |
| 78 } | |
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79 } |
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80 |
| 469 | 81 #elif (NGX_HAVE_SYSVSHM) |
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82 |
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83 #include <sys/ipc.h> |
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84 #include <sys/shm.h> |
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86 |
| 605 | 87 ngx_int_t |
| 88 ngx_shm_alloc(ngx_shm_t *shm) | |
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89 { |
| 605 | 90 int id; |
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91 |
| 605 | 92 id = shmget(IPC_PRIVATE, shm->size, (SHM_R|SHM_W|IPC_CREAT)); |
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93 |
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94 if (id == -1) { |
| 605 | 95 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
| 96 "shmget(%uz) failed", shm->size); | |
| 97 return NGX_ERROR; | |
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98 } |
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99 |
| 605 | 100 ngx_log_debug1(NGX_LOG_DEBUG_CORE, shm->log, 0, "shmget id: %d", id); |
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101 |
| 605 | 102 shm->addr = shmat(id, NULL, 0); |
| 103 | |
| 104 if (shm->addr == (void *) -1) { | |
| 105 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, "shmat() failed"); | |
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106 } |
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107 |
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108 if (shmctl(id, IPC_RMID, NULL) == -1) { |
| 605 | 109 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
| 110 "shmctl(IPC_RMID) failed"); | |
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111 } |
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112 |
| 605 | 113 return (shm->addr == (void *) -1) ? NGX_ERROR : NGX_OK; |
| 114 } | |
| 115 | |
| 116 | |
| 117 void | |
| 118 ngx_shm_free(ngx_shm_t *shm) | |
| 119 { | |
| 120 if (shmdt(shm->addr) == -1) { | |
| 121 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, | |
| 122 "shmdt(%p) failed", shm->addr); | |
| 123 } | |
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124 } |
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125 |
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126 #endif |