- 18 Dec, 2012 40 commits
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Akinobu Mita authored
This also converts filling memory loop to use memset. Signed-off-by:
Akinobu Mita <akinobu.mita@gmail.com> Cc: Artem Bityutskiy <dedekind1@gmail.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: David Laight <david.laight@aculab.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Eilon Greenstein <eilong@broadcom.com> Cc: Michel Lespinasse <walken@google.com> Cc: Robert Love <robert.w.love@intel.com> Cc: Valdis Kletnieks <valdis.kletnieks@vt.edu> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Akinobu Mita authored
This also removes unnecessary memset call which is immediately overwritten with random bytes. Signed-off-by:
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Akinobu Mita authored
Use prandom_bytes() to fill rss key with pseudo-random bytes. Signed-off-by:
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Akinobu Mita authored
Add functions to get the requested number of pseudo-random bytes. The difference from get_random_bytes() is that it generates pseudo-random numbers by prandom_u32(). It doesn't consume the entropy pool, and the sequence is reproducible if the same rnd_state is used. So it is suitable for generating random bytes for testing. Signed-off-by:
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Akinobu Mita authored
This renames all random32 functions to have 'prandom_' prefix as follows: void prandom_seed(u32 seed); /* rename from srandom32() */ u32 prandom_u32(void); /* rename from random32() */ void prandom_seed_state(struct rnd_state *state, u64 seed); /* rename from prandom32_seed() */ u32 prandom_u32_state(struct rnd_state *state); /* rename from prandom32() */ The purpose of this renaming is to prevent some kernel developers from assuming that prandom32() and random32() might imply that only prandom32() was the one using a pseudo-random number generator by prandom32's "p", and the result may be a very embarassing security exposure. This concern was expressed by Theodore Ts'o. And furthermore, I'm going to introduce new functions for getting the requested number of pseudo-random bytes. If I continue to use both prandom32 and random32 prefixes for these functions, the confusion is getting worse. As a result of this renaming, "prandom_" is the common prefix for pseudo-random number library. Currently, srandom32() and random32() are preserved because it is difficult to rename too many users at once. Signed-off-by:
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Dan Carpenter authored
We should return NULL on failure instead of returning a freed pointer. Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Cc: Ed Cashin <ecashin@coraid.com> Signed-off-by:
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Ed Cashin authored
This version number is printed to the console on module initialization and is available in sysfs, which is where the userland aoe-version tool looks for it. Signed-off-by:
Ed Cashin <ecashin@coraid.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by:
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Ed Cashin authored
This change only affects experimental AoE storage networks. It modifies the console message about runt packets detected so that the AoE major and minor addresses of the AoE target that generated the runt are mentioned. Signed-off-by:
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Ed Cashin authored
By default, the aoe driver uses any ethernet interface for AoE, but the aoe_iflist module parameter provides a convenient way to limit AoE traffic to a specific list of local network interfaces. This change allows a list to be specified using the comma character as a separator. For example, modprobe aoe aoe_iflist=eth2,eth3 Before, it was inconvenient to get the quoting right in shell scripts when setting aoe_iflist to have more than one network interface. Signed-off-by:
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Ed Cashin authored
With this change, the aoe driver treats the value zero as special for the aoe_deadsecs module parameter. Normally, this value specifies the number of seconds during which the driver will continue to attempt retransmits to an unresponsive AoE target. After aoe_deadsecs has elapsed, the aoe driver marks the aoe device as "down" and fails all I/O. The new meaning of an aoe_deadsecs of zero is for the driver to retransmit commands indefinitely. Signed-off-by:
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Ed Cashin authored
Many AoE targets have four or fewer network ports, but some existing storage devices have many, and the AoE protocol sets no limit. This patch allows the use of more than eight remote MAC addresses per AoE target, while reducing the amount of memory used by the aoe driver in cases where there are many AoE targets with fewer than eight MAC addresses each. Signed-off-by:
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Ed Cashin authored
This change avoids a race that could result in a NULL pointer derference following a WARNing from kobject_add_internal, "don't try to register things with the same name in the same directory." The problem was found with a test that forgets and discovers an aoe device in a loop: while test ! -r /tmp/stop; do aoe-flush -a aoe-discover done The race was between aoedev_flush taking aoedevs out of the devlist, allowing a new discovery of the same AoE target to take place before the driver gets around to calling sysfs_remove_group. Fixing that one revealed another race between do_open and add_disk, and this patch avoids that, too. The fix required some care, because for flushing (forgetting) an aoedev, some of the steps must be performed under lock and some must be able to sleep. Also, for discovering a new aoedev, some steps might sleep. The check for a bad aoedev pointer remains from a time when about half of this patch was done, and it was possible for the bdev->bd_disk->private_data to become corrupted. The check should be removed eventually, but it is not expected to add significant overhead, occurring in the aoeblk_open routine. Signed-off-by:
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Ed Cashin authored
An AoE target can have multiple network ports used for AoE, and in the aoe driver, those are tracked by the aoetgt struct. These changes allow the aoe driver to handle network paths, or aoetgts, that are not working well, compared to the others. Paths that do not get responses despite the retransmission of AoE commands are marked as "tainted", and non-tainted paths are preferred. Meanwhile, the aoe driver attempts to "probe" the tainted path in the background by issuing reads of LBA 0 that are padded out to full (possibly jumbo-frame) size. If the probes get responses, then the path is "redeemed", and its taint is removed. This mechanism has been shown to be helpful in transparently handling and recovering from real-world network "brown outs" in ways that the earlier "shoot the help-needing target in the head" mechanism could not. Signed-off-by:
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Ed Cashin authored
The value returned by the static minor device number number allocator is the real minor number, so it must be multiplied by the supported number of partitions per aoedev. Without this fix the support for systems without udev is incomplete, and the few users of aoe on such systems will have surprising results when device nodes names do not match the AoE target. Signed-off-by:
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Ed Cashin authored
Because the minor_get and related functions use the return values for errors, the compiler doesn't know that sysminor will always either 1) be initialized in aoedev_by_aoeaddr by the call to minor_get, or 2) be unused as the "goto out" is executed. This patch avoids the compiler warning. Signed-off-by:
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Ed Cashin authored
For some special-purpose systems where udev isn't present, static allocation of minor numbers is desirable. This update distinguishes different failure scenarios, to help the user understand what went wrong. Signed-off-by:
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Ed Cashin authored
There is no need to call the request handler function in the I/O completion routine. The user impact of not doing it is a more "nice" aoe driver that is less susceptible to causing soft lockups. Signed-off-by:
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Ed Cashin authored
A misplaced comment was attached to the nout member of the aoetgt. This change corrects the comment. Signed-off-by:
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Ed Cashin authored
The aoe driver will never be waiting for more than aoe_maxout AoE commands from a given remote network port on an AoE target. Increasing the cap increases performance. Users can tighten the setting to reduce the amount of memory used for handling AoE traffic or the network bandwidth used for AoE. Signed-off-by:
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Ed Cashin authored
Before the aoe driver was an I/O request handler, it was a make_request-style block driver. Even so, there was a problem where sysfs expected a request queue to exist, so one was provided in commit 7135a71b ("aoe: allocate unused request_queue for sysfs"). During the transition to the request-handler style, a patch was merged that was based on a driver without the noop queue, and the noop queue remained in place after the patch was merged, even though a new functional queue was introduced by the patch, allocated through blk_init_queue. The user impact is a memory leak proportional to the number of AoE targets discovered. This patch removes the memory leak and cleans up vestiges of the old do-nothing queue from the aoeblk_gdalloc function. Signed-off-by:
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Ed Cashin authored
Commit f3b8e07af774 ("aoe: commands in retransmit queue use new destination on failure") omits the copying of the coarse-grained time when an AoE command was sent during the failover from one destination MAC address on the AoE target to another. The coarse-grained timing is only used when the system time changes or an unlikely length of time has passed since the sending of the AoE command. Users will not be impacted unless their system clock is very inaccurate or something unusual (e.g., 10 GbE link reset) happens during the period when the aoe driver is handling the failure of a port on the AoE target. Being effected will mean that an AoE target could be considered "down" too eagerly. Signed-off-by: -
Ed Cashin authored
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Ed Cashin authored
When one remote MAC address isn't working as a destination for AoE commands, the frames used to track information associated with the AoE commands are moved to a new aoetgt (defined by the tuple of {AoE major, AoE minor, target MAC address}). This patch makes sure that the frames on the queue for retransmits that need to be done are updated to use the new destination, so that retransmits will be sent through a working network path. Without this change, packets on the retransmit queue will be needlessly retransmitted to the unresponsive destination MAC, possibly causing premature target failure before there's time for the retransmit timer to run again, decide to retransmit again, and finally update the destination to a working MAC address on the AoE target. Signed-off-by: -
Ed Cashin authored
These changes improve the accuracy of the decision about whether it's time to retransmit an AoE command by using the microsecond-resolution gettimeofday instead of jiffies. Because the system time can jump suddenly, the decision reverts to using jiffies if the high-resolution time difference is relatively large. Otherwise the AoE targets could be considered failed inappropriately. Signed-off-by:
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Ed Cashin authored
With this bugfix in place the calculation of the criterion for "lateness" is performed under lock. Without the lock, there is a chance that one of the non-atomic operations performed on the round trip time statistics could be incomplete, such that an incorrect lateness criterion would be calculated. Without this change, the effect of the bug would be rare unecessary but benign retransmissions. Signed-off-by:
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Ed Cashin authored
The /dev/etherd/err character device provides low-level information about normal but sometimes interesting AoE command retransmits and "unexpected responses", i.e., responses for packets that have already been retransmitted. This change adds MAC addresses to the messages about unexpected responses, so that when they occur, it's more easy to determine the network paths to which they belong. Signed-off-by:
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Ed Cashin authored
The aoe driver already had some congestion handling, but it was limited in its ability to cope with the kind of congestion that can arise on more complex networks such as those involving paths through multiple ethernet switches. Some of the lessons from TCP's history of development can be applied to improving the congestion control and avoidance on AoE storage networks. These changes use familar concepts from Van Jacobson's "Congestion Avoidance and Control" paper from '88, without adding significant overhead. This patch depends on an upcoming patch that covers the failover case when AoE commands being retransmitted are transferred from one retransmit queue to another. Another upcoming patch increases the timing accuracy. Signed-off-by:
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Ed Cashin authored
Make the aoe driver follow expected behavior when the user uses ioctl to get the ATA device identify information, allowing access to model, serial number, etc. Signed-off-by:
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Ed Cashin authored
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Ed Cashin authored
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Ed Cashin authored
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Ed Cashin authored
The userland aoetools package includes an "aoe-stat" command that can display a "payload size" column when the aoe driver exports this information. Users can quickly see what amount of user data is transferred inside each AoE command on the network, network headers excluded. Signed-off-by:
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Ed Cashin authored
The GPFS filesystem is an example of an aoe user that requires the aoe driver to support I/O request sizes larger than the default. Most users will not need large I/O request sizes, because they would need to be split up into multiple AoE commands anyway. Signed-off-by:
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Ed Cashin authored
Users sometimes want to cause the aoe driver to forget a particular previously discovered device when it is no longer online. The aoetools provide an "aoe-flush" command that users run to perform this administrative task. The changes below provide the support needed in the driver. Signed-off-by:
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Ed Cashin authored
The ATA over Ethernet config query response contains a "buffer count" field reflecting the AoE target's capacity to buffer incoming AoE commands. By taking the current value of this field into accound, we increase performance throughput or avoid network congestion, when the value has increased or decreased, respectively. Signed-off-by:
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Ed Cashin authored
Dropped transmits are not common, but when they do occur, increasing the transmit queue length often helps. Signed-off-by:
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Ed Cashin authored
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Ed Cashin authored
The context feature of sparse is used with the Linux kernel sources to check for imbalanced uses of locks. Document the annotations defined in include/linux/compiler.h that tell sparse what to expect when a lock is held on function entry, exit, or both. Signed-off-by:
Josh Triplett <josh@joshtriplett.org> Acked-by:
Christopher Li <sparse@chrisli.org> Signed-off-by:
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Josh Triplett authored
linux/compiler.h has macros to denote functions that acquire or release locks, but not to denote functions called with a lock held that return with the lock still held. Add a __must_hold macro to cover that case. Signed-off-by:
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Gao feng authored
Since commit 1cdcbec1 ("CRED: Neuter sys_capset()") is_container_init() has no callers. Signed-off-by:
Gao feng <gaofeng@cn.fujitsu.com> Cc: David Howells <dhowells@redhat.com> Acked-by:
Serge Hallyn <serge.hallyn@canonical.com> Cc: James Morris <jmorris@namei.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by:
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