- 28 Jun, 2017 1 commit
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Jens Axboe authored
Some architectures (at least PPC) doesn't like get/put_user with 64-bit types on a 32-bit system. Use the variably sized copy to/from user variants instead. Reported-by:
Stephen Rothwell <sfr@canb.auug.org.au> Fixes: c75b1d94 ("fs: add fcntl() interface for setting/getting write life time hints") Signed-off-by:
Jens Axboe <axboe@kernel.dk>
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- 27 Jun, 2017 22 commits
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Julia Lawall authored
Drop static on a local variable, when the variable is initialized before any use, on every possible execution path through the function. The static has no benefit, and dropping it reduces the code size. The semantic patch that fixes this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @bad exists@ position p; identifier x; type T; @@ static T x@p; ... x = <+...x...+> @@ identifier x; expression e; type T; position p != bad.p; @@ -static T x@p; ... when != x when strict ?x = e; // </smpl> The change in code size is indicates by the following output from the size command. before: text data bss dec hex filename 67299 2291 1056 70646 113f6 drivers/block/drbd/drbd_nl.o after: text data bss dec hex filename 67283 2291 1056 70630 113e6 drivers/block/drbd/drbd_nl.o Signed-off-by:
Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by:
Roland Kammerer <roland.kammerer@linbit.com> Signed-off-by:
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Paolo Valente authored
This commit fixes a bug triggered by a non-trivial sequence of events. These events are briefly described in the next two paragraphs. The impatiens, or those who are familiar with queue merging and splitting, can jump directly to the last paragraph. On each I/O-request arrival for a shared bfq_queue, i.e., for a bfq_queue that is the result of the merge of two or more bfq_queues, BFQ checks whether the shared bfq_queue has become seeky (i.e., if too many random I/O requests have arrived for the bfq_queue; if the device is non rotational, then random requests must be also small for the bfq_queue to be tagged as seeky). If the shared bfq_queue is actually detected as seeky, then a split occurs: the bfq I/O context of the process that has issued the request is redirected from the shared bfq_queue to a new non-shared bfq_queue. As a degenerate case, if the shared bfq_queue actually happens to be shared only by one process (because of previous splits), then no new bfq_queue is created: the state of the shared bfq_queue is just changed from shared to non shared. Regardless of whether a brand new non-shared bfq_queue is created, or the pre-existing shared bfq_queue is just turned into a non-shared bfq_queue, several parameters of the non-shared bfq_queue are set (restored) to the original values they had when the bfq_queue associated with the bfq I/O context of the process (that has just issued an I/O request) was merged with the shared bfq_queue. One of these parameters is the weight-raising state. If, on the split of a shared bfq_queue, 1) a pre-existing shared bfq_queue is turned into a non-shared bfq_queue; 2) the previously shared bfq_queue happens to be busy; 3) the weight-raising state of the previously shared bfq_queue happens to change; the number of weight-raised busy queues changes. The field wr_busy_queues must then be updated accordingly, but such an update was missing. This commit adds the missing update. Reported-by:
Luca Miccio <lucmiccio@gmail.com> Signed-off-by:
Paolo Valente <paolo.valente@linaro.org> Signed-off-by:
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Christoph Hellwig authored
BLK_BOUNCE_ANY is the defauly now, so the call is superflous. Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
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Christoph Hellwig authored
Now all queues allocators come without abounce limit by default, dm doesn't have to override this anymore. Signed-off-by:
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Christoph Hellwig authored
Instead move it to the callers. Those that either don't use bio_data() or page_address() or are specific to architectures that do not support highmem are skipped. Signed-off-by:
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Christoph Hellwig authored
And just move it into scsi_transport_sas which needs it due to low-level drivers directly derferencing bio_data, and into blk_init_queue_node, which will need a further push into the callers. Signed-off-by:
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Christoph Hellwig authored
For historical reasons we default to bouncing highmem pages for all block queues. But the blk-mq drivers are easy to audit to ensure that we don't need this - scsi and mtip32xx set explicit limits and everyone else doesn't have any particular ones. Signed-off-by:
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Christoph Hellwig authored
We only call blk_queue_bounce for request-based drivers, so stop messing with it for make_request based drivers. Signed-off-by:
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Christoph Hellwig authored
Only used inside the bounce code, and opencoding it makes it more obvious what is going on. Signed-off-by:
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Christoph Hellwig authored
Signed-off-by:
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Christoph Hellwig authored
This makes moves the knowledge about bouncing out of the callers into the block core (just like we do for the normal I/O path), and allows to unexport blk_queue_bounce. Signed-off-by:
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Christoph Hellwig authored
pktcdvd is a make_request based stacking driver and thus doesn't have any addressing limits on it's own. It also doesn't use bio_data() or page_address(), so it doesn't need a lowmem bounce either. Signed-off-by:
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Jens Axboe authored
This adds support for Directives in NVMe, particular for the Streams directive. Support for Directives is a new feature in NVMe 1.3. It allows a user to pass in information about where to store the data, so that it the device can do so most effiently. If an application is managing and writing data with different life times, mixing differently retentioned data onto the same locations on flash can cause write amplification to grow. This, in turn, will reduce performance and life time of the device. Reviewed-by:
Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by:
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Jens Axboe authored
Reviewed-by:
Andreas Dilger <adilger@dilger.ca> Signed-off-by:
Chris Mason <clm@fb.com> Reviewed-by:
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Jens Axboe authored
Reviewed-by:
Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by:
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Jens Axboe authored
Reviewed-by:
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Jens Axboe authored
Reviewed-by:
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Jens Axboe authored
Reviewed-by:
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Jens Axboe authored
Useful to verify that things are working the way they should. Reading the file will return number of kb written with each write hint. Writing the file will reset the statistics. No care is taken to ensure that we don't race on updates. Drivers will write to q->write_hints[] if they handle a given write hint. Reviewed-by:
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Jens Axboe authored
No functional changes in this patch, we just use up some holes in the bio and request structures to define a write hint that we psas down the stack. Ensure that we don't merge requests that have different life time hints assigned to them, and that we inherit the write hint when cloning a bio. Reviewed-by:
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Jens Axboe authored
Define a set of write life time hints: RWH_WRITE_LIFE_NOT_SET No hint information set RWH_WRITE_LIFE_NONE No hints about write life time RWH_WRITE_LIFE_SHORT Data written has a short life time RWH_WRITE_LIFE_MEDIUM Data written has a medium life time RWH_WRITE_LIFE_LONG Data written has a long life time RWH_WRITE_LIFE_EXTREME Data written has an extremely long life time The intent is for these values to be relative to each other, no absolute meaning should be attached to these flag names. Add an fcntl interface for querying these flags, and also for setting them as well: F_GET_RW_HINT Returns the read/write hint set on the underlying inode. F_SET_RW_HINT Set one of the above write hints on the underlying inode. F_GET_FILE_RW_HINT Returns the read/write hint set on the file descriptor. F_SET_FILE_RW_HINT Set one of the above write hints on the file descriptor. The user passes in a 64-bit pointer to get/set these values, and the interface returns 0/-1 on success/error. Sample program testing/implementing basic setting/getting of write hints is below. Add support for storing the write life time hint in the inode flags and in struct file as well, and pass them to the kiocb flags. If both a file and its corresponding inode has a write hint, then we use the one in the file, if available. The file hint can be used for sync/direct IO, for buffered writeback only the inode hint is available. This is in preparation for utilizing these hints in the block layer, to guide on-media data placement. /* * writehint.c: get or set an inode write hint */ #include <stdio.h> #include <fcntl.h> #include <stdlib.h> #include <unistd.h> #include <stdbool.h> #include <inttypes.h> #ifndef F_GET_RW_HINT #define F_LINUX_SPECIFIC_BASE 1024 #define F_GET_RW_HINT (F_LINUX_SPECIFIC_BASE + 11) #define F_SET_RW_HINT (F_LINUX_SPECIFIC_BASE + 12) #endif static char *str[] = { "RWF_WRITE_LIFE_NOT_SET", "RWH_WRITE_LIFE_NONE", "RWH_WRITE_LIFE_SHORT", "RWH_WRITE_LIFE_MEDIUM", "RWH_WRITE_LIFE_LONG", "RWH_WRITE_LIFE_EXTREME" }; int main(int argc, char *argv[]) { uint64_t hint; int fd, ret; if (argc < 2) { fprintf(stderr, "%s: file <hint>\n", argv[0]); return 1; } fd = open(argv[1], O_RDONLY); if (fd < 0) { perror("open"); return 2; } if (argc > 2) { hint = atoi(argv[2]); ret = fcntl(fd, F_SET_RW_HINT, &hint); if (ret < 0) { perror("fcntl: F_SET_RW_HINT"); return 4; } } ret = fcntl(fd, F_GET_RW_HINT, &hint); if (ret < 0) { perror("fcntl: F_GET_RW_HINT"); return 3; } printf("%s: hint %s\n", argv[1], str[hint]); close(fd); return 0; } Reviewed-by: -
Rakesh Pandit authored
While creating new device with NVM_DEV_CREATE if LUNs are already allocated ioctl would return -ENOMEM which is wrong. This patch propagates -EBUSY from nvm_reserve_luns which is correct response. Fixes: ade69e24 ("lightnvm: merge gennvm with core") Reviewed-by:
Frans Klaver <fransklaver@gmail.com> Signed-off-by:
Rakesh Pandit <rakesh@tuxera.com> Signed-off-by:
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- 26 Jun, 2017 17 commits
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Javier González authored
Due to user writes being decoupled from media writes because of the need of an intermediate write buffer, irrecoverable media write errors lead to pblk stalling; user writes fill up the buffer and end up in an infinite retry loop. In order to let user writes fail gracefully, it is necessary for pblk to keep track of its own internal state and prevent further writes from being placed into the write buffer. This patch implements a state machine to keep track of internal errors and, in case of failure, fail further user writes in an standard way. Depending on the type of error, pblk will do its best to persist buffered writes (which are already acknowledged) and close down on a graceful manner. This way, data might be recovered by re-instantiating pblk. Such state machine paves out the way for a state-based FTL log. Signed-off-by:
Javier González <javier@cnexlabs.com> Signed-off-by:
Matias Bjørling <matias@cnexlabs.com> Signed-off-by:
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Javier González authored
Make constants to define sizes for internal mempools and workqueues. In this process, adjust the values to be more meaningful given the internal constrains of the FTL. In order to do this for workqueues, separate the current auxiliary workqueue into two dedicated workqueues to manage lines being closed and bad blocks. Signed-off-by:
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Javier González authored
At the moment, in order to get enough read parallelism, we have recycled several lines at the same time. This approach has proven not to work well when reaching capacity, since we end up mixing valid data from all lines, thus not maintaining a sustainable free/recycled line ratio. The new design, relies on a two level workqueue mechanism. In the first level, we read the metadata for a number of lines based on the GC list they reside on (this is governed by the number of valid sectors in each line). In the second level, we recycle a single line at a time. Here, we issue reads in parallel, while a single GC write thread places data in the write buffer. This design allows to (i) only move data from one line at a time, thus maintaining a sane free/recycled ration and (ii) maintain the GC writer busy with recycled data. Signed-off-by:
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Javier González authored
Add lockdep assertions on helper functions. Signed-off-by:
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Javier González authored
Cleanup unnecessary headers and code lines. Signed-off-by:
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Javier González authored
Set a dma area for all I/Os in order to read/write from/to the metadata stored on the per-sector out-of-bound area. Signed-off-by:
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Javier González authored
At the moment, we separate the closed lines on three different list based on their number of valid sectors. GC recycles lines from each list based on capacity. Lines from each list are taken in a FIFO fashion. Since the number of lines is limited (it corresponds to the number of blocks in a LUN, which is somewhere between 1000-2000), we can afford scanning the lists to choose the optimal line to be recycled. This helps specially in lines with a high number of valid sectors. If the number of blocks per LUN increases, we will consider a more efficient policy. Signed-off-by:
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Javier González authored
Decouple bad block discovery from line allocation logic. This allows to return meaningful error codes in case of bad block discovery failure. Signed-off-by:
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Javier González authored
smeta size will always be suitable for a kmalloc allocation. Simplify the code and leave the vmalloc fallback only for emeta, where the pblk configuration has an impact. Signed-off-by:
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Javier González authored
If a read request is sequential and its size aligns with a multi-plane page size, use the multi-plane hint to process the I/O in parallel in the controller. Signed-off-by:
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Javier González authored
After refactoring the metadata path, the backpointer controlling synced I/Os in a line becomes unnecessary; metadata is scheduled on the write thread, thus we know when the end of the line is reached and act on it directly. Signed-off-by:
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Javier González authored
Remove a legacy variable that helped verifying the consistency of the run-time metadata for the free line list. With the new metadata layout, this check is no longer necessary. Signed-off-by:
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Javier González authored
At the moment, line metadata is persisted on a separate work queue, that is kicked each time that a line is closed. The assumption when designing this was that freeing the write thread from creating a new write request was better than the potential impact of writes colliding on the media (user I/O and metadata I/O). Experimentation has proven that this assumption is wrong; collision can cause up to 25% of bandwidth and introduce long tail latencies on the write thread, which potentially cause user write threads to spend more time spinning to get a free entry on the write buffer. This patch moves the metadata logic to the write thread. When a line is closed, remaining metadata is written in memory and is placed on a metadata queue. The write thread then takes the metadata corresponding to the previous line, creates the write request and schedules it to minimize collisions on the media. Using this approach, we see that we can saturate the media's bandwidth, which helps reducing both write latencies and the spinning time for user writer threads. Signed-off-by:
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Javier González authored
Read requests allocate some extra memory to store its per I/O context. Instead of requiring yet another memory pool for other type of requests, generalize this context allocation (and change naming accordingly). Signed-off-by:
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Javier González authored
Erase I/Os are scheduled with the following goals in mind: (i) minimize LUNs collisions with write I/Os, and (ii) even out the price of erasing on every write, instead of putting all the burden on when garbage collection runs. This works well on the current design, but is specific to the default mapping algorithm. This patch generalizes the erase path so that other mapping algorithms can select an arbitrary line to be erased instead. It also gets rid of the erase semaphore since it creates jittering for user writes. Signed-off-by:
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Javier González authored
Allow to configure the number of maximum sectors per write command through sysfs. This makes it easier to tune write command sizes for different controller configurations. Signed-off-by:
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Javier González authored
Add a new debug counter to measure cache hits on the read path Signed-off-by:
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