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author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-22 20:00:32 -0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-22 20:00:32 -0400 |
commit | e9dd2b6837e26fe202708cce5ea4bb4ee3e3482e (patch) | |
tree | f42fd892495bfc4cbb740d06b016d267c9c42d00 /init | |
parent | 4f3a29dadaf999a273f1e7fe2476595d0283eef3 (diff) | |
parent | b4627321e18582dcbdeb45d77df29d3177107c65 (diff) |
Merge branch 'for-2.6.37/core' of git://git.kernel.dk/linux-2.6-block
* 'for-2.6.37/core' of git://git.kernel.dk/linux-2.6-block: (39 commits)
cfq-iosched: Fix a gcc 4.5 warning and put some comments
block: Turn bvec_k{un,}map_irq() into static inline functions
block: fix accounting bug on cross partition merges
block: Make the integrity mapped property a bio flag
block: Fix double free in blk_integrity_unregister
block: Ensure physical block size is unsigned int
blkio-throttle: Fix possible multiplication overflow in iops calculations
blkio-throttle: limit max iops value to UINT_MAX
blkio-throttle: There is no need to convert jiffies to milli seconds
blkio-throttle: Fix link failure failure on i386
blkio: Recalculate the throttled bio dispatch time upon throttle limit change
blkio: Add root group to td->tg_list
blkio: deletion of a cgroup was causes oops
blkio: Do not export throttle files if CONFIG_BLK_DEV_THROTTLING=n
block: set the bounce_pfn to the actual DMA limit rather than to max memory
block: revert bad fix for memory hotplug causing bounces
Fix compile error in blk-exec.c for !CONFIG_DETECT_HUNG_TASK
block: set the bounce_pfn to the actual DMA limit rather than to max memory
block: Prevent hang_check firing during long I/O
cfq: improve fsync performance for small files
...
Fix up trivial conflicts due to __rcu sparse annotation in include/linux/genhd.h
Diffstat (limited to 'init')
-rw-r--r-- | init/Kconfig | 9 | ||||
-rw-r--r-- | init/do_mounts.c | 70 |
2 files changed, 76 insertions, 3 deletions
diff --git a/init/Kconfig b/init/Kconfig index be85a0ab1b82..bd125a795374 100644 --- a/init/Kconfig +++ b/init/Kconfig | |||
@@ -661,11 +661,14 @@ config BLK_CGROUP | |||
661 | 661 | ||
662 | Currently, CFQ IO scheduler uses it to recognize task groups and | 662 | Currently, CFQ IO scheduler uses it to recognize task groups and |
663 | control disk bandwidth allocation (proportional time slice allocation) | 663 | control disk bandwidth allocation (proportional time slice allocation) |
664 | to such task groups. | 664 | to such task groups. It is also used by bio throttling logic in |
665 | block layer to implement upper limit in IO rates on a device. | ||
665 | 666 | ||
666 | This option only enables generic Block IO controller infrastructure. | 667 | This option only enables generic Block IO controller infrastructure. |
667 | One needs to also enable actual IO controlling logic in CFQ for it | 668 | One needs to also enable actual IO controlling logic/policy. For |
668 | to take effect. (CONFIG_CFQ_GROUP_IOSCHED=y). | 669 | enabling proportional weight division of disk bandwidth in CFQ seti |
670 | CONFIG_CFQ_GROUP_IOSCHED=y and for enabling throttling policy set | ||
671 | CONFIG_BLK_THROTTLE=y. | ||
669 | 672 | ||
670 | See Documentation/cgroups/blkio-controller.txt for more information. | 673 | See Documentation/cgroups/blkio-controller.txt for more information. |
671 | 674 | ||
diff --git a/init/do_mounts.c b/init/do_mounts.c index 02e3ca4fc527..42db0551c3aa 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c | |||
@@ -58,6 +58,62 @@ static int __init readwrite(char *str) | |||
58 | __setup("ro", readonly); | 58 | __setup("ro", readonly); |
59 | __setup("rw", readwrite); | 59 | __setup("rw", readwrite); |
60 | 60 | ||
61 | #ifdef CONFIG_BLOCK | ||
62 | /** | ||
63 | * match_dev_by_uuid - callback for finding a partition using its uuid | ||
64 | * @dev: device passed in by the caller | ||
65 | * @data: opaque pointer to a 36 byte char array with a UUID | ||
66 | * | ||
67 | * Returns 1 if the device matches, and 0 otherwise. | ||
68 | */ | ||
69 | static int match_dev_by_uuid(struct device *dev, void *data) | ||
70 | { | ||
71 | u8 *uuid = data; | ||
72 | struct hd_struct *part = dev_to_part(dev); | ||
73 | |||
74 | if (!part->info) | ||
75 | goto no_match; | ||
76 | |||
77 | if (memcmp(uuid, part->info->uuid, sizeof(part->info->uuid))) | ||
78 | goto no_match; | ||
79 | |||
80 | return 1; | ||
81 | no_match: | ||
82 | return 0; | ||
83 | } | ||
84 | |||
85 | |||
86 | /** | ||
87 | * devt_from_partuuid - looks up the dev_t of a partition by its UUID | ||
88 | * @uuid: 36 byte char array containing a hex ascii UUID | ||
89 | * | ||
90 | * The function will return the first partition which contains a matching | ||
91 | * UUID value in its partition_meta_info struct. This does not search | ||
92 | * by filesystem UUIDs. | ||
93 | * | ||
94 | * Returns the matching dev_t on success or 0 on failure. | ||
95 | */ | ||
96 | static dev_t __init devt_from_partuuid(char *uuid_str) | ||
97 | { | ||
98 | dev_t res = 0; | ||
99 | struct device *dev = NULL; | ||
100 | u8 uuid[16]; | ||
101 | |||
102 | /* Pack the requested UUID in the expected format. */ | ||
103 | part_pack_uuid(uuid_str, uuid); | ||
104 | |||
105 | dev = class_find_device(&block_class, NULL, uuid, &match_dev_by_uuid); | ||
106 | if (!dev) | ||
107 | goto done; | ||
108 | |||
109 | res = dev->devt; | ||
110 | put_device(dev); | ||
111 | |||
112 | done: | ||
113 | return res; | ||
114 | } | ||
115 | #endif | ||
116 | |||
61 | /* | 117 | /* |
62 | * Convert a name into device number. We accept the following variants: | 118 | * Convert a name into device number. We accept the following variants: |
63 | * | 119 | * |
@@ -68,6 +124,8 @@ __setup("rw", readwrite); | |||
68 | * of partition - device number of disk plus the partition number | 124 | * of partition - device number of disk plus the partition number |
69 | * 5) /dev/<disk_name>p<decimal> - same as the above, that form is | 125 | * 5) /dev/<disk_name>p<decimal> - same as the above, that form is |
70 | * used when disk name of partitioned disk ends on a digit. | 126 | * used when disk name of partitioned disk ends on a digit. |
127 | * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the | ||
128 | * unique id of a partition if the partition table provides it. | ||
71 | * | 129 | * |
72 | * If name doesn't have fall into the categories above, we return (0,0). | 130 | * If name doesn't have fall into the categories above, we return (0,0). |
73 | * block_class is used to check if something is a disk name. If the disk | 131 | * block_class is used to check if something is a disk name. If the disk |
@@ -82,6 +140,18 @@ dev_t name_to_dev_t(char *name) | |||
82 | dev_t res = 0; | 140 | dev_t res = 0; |
83 | int part; | 141 | int part; |
84 | 142 | ||
143 | #ifdef CONFIG_BLOCK | ||
144 | if (strncmp(name, "PARTUUID=", 9) == 0) { | ||
145 | name += 9; | ||
146 | if (strlen(name) != 36) | ||
147 | goto fail; | ||
148 | res = devt_from_partuuid(name); | ||
149 | if (!res) | ||
150 | goto fail; | ||
151 | goto done; | ||
152 | } | ||
153 | #endif | ||
154 | |||
85 | if (strncmp(name, "/dev/", 5) != 0) { | 155 | if (strncmp(name, "/dev/", 5) != 0) { |
86 | unsigned maj, min; | 156 | unsigned maj, min; |
87 | 157 | ||