- 09 12月, 2006 1 次提交
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由 Josef "Jeff" Sipek 提交于
This patch changes struct file to use struct path instead of having independent pointers to struct dentry and struct vfsmount, and converts all users of f_{dentry,vfsmnt} in fs/ to use f_path.{dentry,mnt}. Additionally, it adds two #define's to make the transition easier for users of the f_dentry and f_vfsmnt. Signed-off-by: NJosef "Jeff" Sipek <jsipek@cs.sunysb.edu> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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- 05 11月, 2006 1 次提交
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由 Jens Axboe 提交于
After the inode slimming patch that unionised i_pipe/i_bdev/i_cdev, it's no longer enough to check for existance of ->i_pipe to verify that this is a pipe. Original patch from Eric Dumazet <dada1@cosmosbay.com> Final solution suggested by Linus. Signed-off-by: NJens Axboe <jens.axboe@oracle.com> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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- 29 10月, 2006 1 次提交
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由 Nick Piggin 提交于
- Consolidate page_cache_alloc - Fix splice: only the pagecache pages and filesystem data need to use mapping_gfp_mask. - Fix grab_cache_page_nowait: same as splice, also honour NUMA placement. Signed-off-by: NNick Piggin <npiggin@suse.de> Cc: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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- 20 10月, 2006 3 次提交
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由 Jens Axboe 提交于
Originally from Mark Fasheh <mark.fasheh@oracle.com> generic_file_splice_write() does not remove S_ISUID or S_ISGID. This is inconsistent with the way we generally write to files. Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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由 Mark Fasheh 提交于
This allows file systems to manage their own i_mutex locking while still re-using the generic_file_splice_write() logic. OCFS2 in particular wants this so that it can order cluster locks within i_mutex. Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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由 Mark Fasheh 提交于
The splice_actor may be calling ->prepare_write() and ->commit_write(). We want i_mutex on the inode being written to before calling those so that we don't race i_size changes. The double locking behavior is done elsewhere in splice.c, and if we eventually want _nolock variants of generic_file_splice_write(), fs modules might have to replicate the nasty locking code. We introduce inode_double_lock() and inode_double_unlock() to consolidate the locking rules into one set of functions. Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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- 12 10月, 2006 1 次提交
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由 Jens Axboe 提交于
Don't jump to the unlock+release path, we already did that. Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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- 01 10月, 2006 1 次提交
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由 Jens Axboe 提交于
As people often look for the copyright in files to see who to mail, update the link to a neutral one. Signed-off-by: NJens Axboe <axboe@kernel.dk>
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- 10 7月, 2006 1 次提交
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由 Jens Axboe 提交于
Several issues noticed/fixed: - We cannot reliably block in link_pipe() while holding both input and output mutexes. So do preparatory checks before locking down both mutexes and doing the link. - The ipipe->nrbufs vs i check was bad, because we could have dropped the ipipe lock in-between. This causes us to potentially look at unknown buffers if we were racing with someone else reading this pipe. Signed-off-by: NJens Axboe <axboe@suse.de>
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- 23 6月, 2006 1 次提交
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由 Jens Axboe 提交于
Otherwise we could be racing with truncate/mapping removal. Problem found/fixed by Nick Piggin <npiggin@suse.de>, logic rewritten by me. Signed-off-by: NJens Axboe <axboe@suse.de>
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- 04 5月, 2006 4 次提交
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由 Jens Axboe 提交于
This can happen quite easily, if several processes are trying to splice the same file at the same time. It's not a failure, it just means someone raced with us in allocating this file page. So just dump the allocated page and relookup the original. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
Same thing was done in fs/pipe.c and most of fs/splice.c, but we had a few missing still. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
Nick says that the current construct isn't safe. This goes back to the original, but sets PIPE_BUF_FLAG_LRU on user pages as well as they all seem to be on the LRU in the first place. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
Looking at generic_file_buffered_write(), we need to unlock_page() if prepare write fails and it isn't due to racing with truncate(). Also trim the size if ->prepare_write() fails, if we have to. Signed-off-by: NJens Axboe <axboe@suse.de>
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- 02 5月, 2006 8 次提交
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由 Jens Axboe 提交于
Apply the same rules as the anon pipe pages, only allow stealing if no one else is using the page. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
Currently we rely on the PIPE_BUF_FLAG_LRU flag being set correctly to know whether we need to fiddle with page LRU state after stealing it, however for some origins we just don't know if the page is on the LRU list or not. So remove PIPE_BUF_FLAG_LRU and do this check/add manually in pipe_to_file() instead. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
We need to use the minium of {len, PAGE_SIZE-off}, not {len, PAGE_SIZE}-off. The latter doesn't make any sense, and could cause us to attempt negative length transfers... Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
If SPLICE_F_GIFT is set, the user is basically giving this pages away to the kernel. That means we can steal them for eg page cache uses instead of copying it. The data must be properly page aligned and also a multiple of the page size in length. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
The pipe ->map() method uses kmap() to virtually map the pages, which is both slow and has known scalability issues on SMP. This patch enables atomic copying of pipe pages, by pre-faulting data and using kmap_atomic() instead. lmbench bw_pipe and lat_pipe measurements agree this is a Good Thing. Here are results from that on a UP machine with highmem (1.5GiB of RAM), running first a UP kernel, SMP kernel, and SMP kernel patched. Vanilla-UP: Pipe bandwidth: 1622.28 MB/sec Pipe bandwidth: 1610.59 MB/sec Pipe bandwidth: 1608.30 MB/sec Pipe latency: 7.3275 microseconds Pipe latency: 7.2995 microseconds Pipe latency: 7.3097 microseconds Vanilla-SMP: Pipe bandwidth: 1382.19 MB/sec Pipe bandwidth: 1317.27 MB/sec Pipe bandwidth: 1355.61 MB/sec Pipe latency: 9.6402 microseconds Pipe latency: 9.6696 microseconds Pipe latency: 9.6153 microseconds Patched-SMP: Pipe bandwidth: 1578.70 MB/sec Pipe bandwidth: 1579.95 MB/sec Pipe bandwidth: 1578.63 MB/sec Pipe latency: 9.1654 microseconds Pipe latency: 9.2266 microseconds Pipe latency: 9.1527 microseconds Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
Notify the readahead logic of the missing page. Suggested by Oleg Nesterov. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
The ->map() function is really expensive on highmem machines right now, since it has to use the slower kmap() instead of kmap_atomic(). Splice rarely needs to access the virtual address of a page, so it's a waste of time doing it. Introduce ->pin() to take over the responsibility of making sure the page data is valid. ->map() is then reduced to just kmap(). That way we can also share a most of the pipe buffer ops between pipe.c and splice.c Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
Found by Oleg Nesterov <oleg@tv-sign.ru>, fixed by me. - Only allow full pages to go to the page cache. - Check page != buf->page instead of using PIPE_BUF_FLAG_STOLEN. - Remember to clear 'stolen' if add_to_page_cache() fails. And as a cleanup on that: - Make the bottom fall-through logic a little less convoluted. Also make the steal path hold an extra reference to the page, so we don't have to differentiate between stolen and non-stolen at the end. Signed-off-by: NJens Axboe <axboe@suse.de>
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- 30 4月, 2006 1 次提交
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由 Jens Axboe 提交于
- Check that page has suitable count for stealing in the regular pipes. - pipe_to_file() assumes that the page is locked on succesful steal, so do that in the pipe steal hook - Missing unlock_page() in add_to_page_cache() failure. Signed-off-by: NJens Axboe <axboe@suse.de>
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- 27 4月, 2006 2 次提交
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由 Jens Axboe 提交于
Use the new find_get_pages_contig() to potentially look up the entire splice range in one single call. This speeds up generic_file_splice_read() quite a bit. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
Avoids doing useless work, when the file is fully cached. Signed-off-by: NJens Axboe <axboe@suse.de>
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- 26 4月, 2006 4 次提交
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由 Jens Axboe 提交于
We need these for people writing their own ->splice_read/write hooks. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
sys_splice() moves data to/from pipes with a file input/output. sys_vmsplice() moves data to a pipe, with the input being a user address range instead. This uses an approach suggested by Linus, where we can hold partial ranges inside the pages[] map. Hopefully this will be useful for network receive support as well. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
Make the move_from_pipe() actors return number of bytes processed, then move_from_pipe() can decide more cleverly when to move on to the next buffer. This fixes problems with pipe offset and differing file offset. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Andrew Morton 提交于
Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NJens Axboe <axboe@suse.de>
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- 20 4月, 2006 1 次提交
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由 Jens Axboe 提交于
Signed-off-by: NJens Axboe <axboe@suse.de>
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- 19 4月, 2006 5 次提交
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由 Jens Axboe 提交于
Since ->map() no longer locks the page, we need to adjust the handling of those pages (and stealing) a little. This now passes full regressions again. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
- We need to adjust *ppos for writes as well. - Copy back modified offset value if one was passed in, similar to what sendfile does. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
We need to ensure that we only drop a lock that is ordered last, to avoid ABBA deadlocks with competing processes. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
- generic_file_splice_read() more readable and correct - Don't bail on page allocation with NONBLOCK set, just don't allow direct blocking on IO (eg lock_page). Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
We need to check i_size after doing a blocking readpage. Signed-off-by: NJens Axboe <axboe@suse.de>
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- 11 4月, 2006 5 次提交
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由 Jens Axboe 提交于
Basically an in-kernel implementation of tee, which uses splice and the pipe buffers as an intelligent way to pass data around by reference. Where the user space tee consumes the input and produces a stdout and file output, this syscall merely duplicates the data inside a pipe to another pipe. No data is copied, the output just grabs a reference to the input pipe data. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
We need not use ->f_pos as the offset for the file input/output. If the user passed an offset pointer in through sys_splice(), just use that and leave ->f_pos alone. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Ingo Molnar 提交于
- capitalize consistently - end sentences in one way or another - update comment text to match the implementation Signed-off-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
The comment is also somewhat out of date, correct that as well. Signed-off-by: NJens Axboe <axboe@suse.de>
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由 Jens Axboe 提交于
Also corrects a few comments. Patch mainly from Ingo, changes by me. Signed-off-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NJens Axboe <axboe@suse.de>
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