- 24 Jun, 2005 16 commits
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Chris Zankel authored
The attached patches provides part 1 of an architecture implementation for the Tensilica Xtensa CPU series. Signed-off-by:
Chris Zankel <chris@zankel.net> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Chris Zankel authored
Start of a patch series which adds support for the xtensa architecture to Linux. The Xtensa architecture is highly configurable and usually buried inside an SOC device. So, if you buy a new printer, digital camera, or cell phone, there is a chance that there is an Xtensa inside even though you don't know it (sometimes as a small audio-engine or as a control CPU). Linux hasn't been adopted widely with Xtensa yet, but with Linux growing in the embedded space, I am sure it will become much more important. The attached patch supplies the maintainer record for an architecture implementation for the Tensilica Xtensa CPU series. Signed-off-by:
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Jan Kara authored
Use improved credits estimates for quota operations. Also reserve space for a quota operation in a transaction only if filesystem was mounted with some quota option. Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
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Jan Kara authored
Use improved credits estimates for quota operations. Also reserve a space for a quota operation in a transaction only if filesystem was mounted with some quota options. Signed-off-by:
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Jan Kara authored
Improve estimates on the number of needed credits for quota transaction. Now we distinguish blocks that might need to be allocated and blocks that only need to be rewritten. Also we distinguish deleting of a quota structure and creating of a new one. Signed-off-by:
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Jan Kara authored
Check return values of journal_begin() and journal_end() in the quota code for reiserfs. Signed-off-by:
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Christoph Hellwig authored
XFS will have to look at iocb->private to fix aio+dio. No other filesystem is using the blockdev_direct_IO* end_io callback. Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
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Michael Halcrow authored
Export this symbol to GPL modules for eCryptfs: an out-of-tree GPL'ed filesystem. Signed off by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by:
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David Howells authored
The attached patch makes the following changes: (1) There's a new special key type called ".request_key_auth". This is an authorisation key for when one process requests a key and another process is started to construct it. This type of key cannot be created by the user; nor can it be requested by kernel services. Authorisation keys hold two references: (a) Each refers to a key being constructed. When the key being constructed is instantiated the authorisation key is revoked, rendering it of no further use. (b) The "authorising process". This is either: (i) the process that called request_key(), or: (ii) if the process that called request_key() itself had an authorisation key in its session keyring, then the authorising process referred to by that authorisation key will also be referred to by the new authorisation key. This means that the process that initiated a chain of key requests will authorise the lot of them, and will, by default, wind up with the keys obtained from them in its keyrings. (2) request_key() creates an authorisation key which is then passed to /sbin/request-key in as part of a new session keyring. (3) When request_key() is searching for a key to hand back to the caller, if it comes across an authorisation key in the session keyring of the calling process, it will also search the keyrings of the process specified therein and it will use the specified process's credentials (fsuid, fsgid, groups) to do that rather than the calling process's credentials. This allows a process started by /sbin/request-key to find keys belonging to the authorising process. (4) A key can be read, even if the process executing KEYCTL_READ doesn't have direct read or search permission if that key is contained within the keyrings of a process specified by an authorisation key found within the calling process's session keyring, and is searchable using the credentials of the authorising process. This allows a process started by /sbin/request-key to read keys belonging to the authorising process. (5) The magic KEY_SPEC_*_KEYRING key IDs when passed to KEYCTL_INSTANTIATE or KEYCTL_NEGATE will specify a keyring of the authorising process, rather than the process doing the instantiation. (6) One of the process keyrings can be nominated as the default to which request_key() should attach new keys if not otherwise specified. This is done with KEYCTL_SET_REQKEY_KEYRING and one of the KEY_REQKEY_DEFL_* constants. The current setting can also be read using this call. (7) request_key() is partially interruptible. If it is waiting for another process to finish constructing a key, it can be interrupted. This permits a request-key cycle to be broken without recourse to rebooting. Signed-Off-By:David Howells <dhowells@redhat.com> Signed-Off-By:
Benoit Boissinot <benoit.boissinot@ens-lyon.org> Signed-off-by:
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David Howells authored
The attached patch uses RCU to manage the session keyring pointer in struct signal_struct. This means that searching need not disable interrupts and get a the sighand spinlock to access this pointer. Furthermore, by judicious use of rcu_read_(un)lock(), this patch also avoids the need to take and put refcounts on the session keyring itself, thus saving on even more atomic ops. Signed-Off-By:
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David Howells authored
The attached patch makes it possible to pass a session keyring through to the process spawned by call_usermodehelper(). This allows patch 3/3 to pass an authorisation key through to /sbin/request-key, thus permitting better access controls when doing just-in-time key creation. Signed-Off-By:
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David Howells authored
The attached patch changes the key implementation in a number of ways: (1) It removes the spinlock from the key structure. (2) The key flags are now accessed using atomic bitops instead of write-locking the key spinlock and using C bitwise operators. The three instantiation flags are dealt with with the construction semaphore held during the request_key/instantiate/negate sequence, thus rendering the spinlock superfluous. The key flags are also now bit numbers not bit masks. (3) The key payload is now accessed using RCU. This permits the recursive keyring search algorithm to be simplified greatly since no locks need be taken other than the usual RCU preemption disablement. Searching now does not require any locks or semaphores to be held; merely that the starting keyring be pinned. (4) The keyring payload now includes an RCU head so that it can be disposed of by call_rcu(). This requires that the payload be copied on unlink to prevent introducing races in copy-down vs search-up. (5) The user key payload is now a structure with the data following it. It includes an RCU head like the keyring payload and for the same reason. It also contains a data length because the data length in the key may be changed on another CPU whilst an RCU protected read is in progress on the payload. This would then see the supposed RCU payload and the on-key data length getting out of sync. I'm tempted to drop the key's datalen entirely, except that it's used in conjunction with quota management and so is a little tricky to get rid of. (6) Update the keys documentation. Signed-Off-By: -
Andrea Arcangeli authored
The seccomp check has to happen when entering the syscall and not when exiting it or regs->gpr[0] contains garabge during signal handling in ppc64_rt_sigreturn (this actually might be a bug too, but an orthogonal one, since we really have to run the check before invoking the syscall and not after it). Signed-off-by:
Andrea Arcangeli <andrea@cpushare.com> Signed-off-by:
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Linus Torvalds authored
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- 23 Jun, 2005 24 commits
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Linus Torvalds authored
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David Mosberger-Tang authored
Signed-off-by:
David Mosberger-Tang <davidm@hpl.hp.com> Signed-off-by:
Tony Luck <tony.luck@intel.com>
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Russell King authored
Signed-off-by:Russell King <rmk+kernel@arm.linux.org.uk>
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Ben Dooks authored
Patch from Ben Dooks Add support for the DM9000 and bring default configuration up-to-date with the latest 2.6.12 kernel release Signed-off-by:
Ben Dooks <ben-linux@fluff.org> Signed-off-by:
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Ben Dooks authored
Patch from Ben Dooks Add platform_device information for DM9000 chip(s) on the Simtec BAST and the VR1000 board. Signed-off-by:
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Ben Dooks authored
Patch from Ben Dooks Remove warning of casting `const char *` to a `char *` type. Signed-off-by:
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Nicolas Pitre authored
Patch from Nicolas Pitre Signed-off-by:
Nicolas Pitre <nico@cam.org> Signed-off-by:
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Nicolas Pitre authored
Patch from Nicolas Pitre Signed-off-by:
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John Heffner authored
This patch implements Tom Kelly's Scalable TCP congestion control algorithm for the modular framework. The algorithm has some nice scaling properties, and has been used a fair bit in research, though is known to have significant fairness issues, so it's not really suitable for general purpose use. Signed-off-by:
John Heffner <jheffner@psc.edu> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Baruch Even authored
H-TCP is a congestion control algorithm developed at the Hamilton Institute, by Douglas Leith and Robert Shorten. It is extending the standard Reno algorithm with mode switching is thus a relatively simple modification. H-TCP is defined in a layered manner as it is still a research platform. The basic form includes the modification of beta according to the ratio of maxRTT to min RTT and the alpha=2*factor*(1-beta) relation, where factor is dependant on the time since last congestion. The other layers improve convergence by adding appropriate factors to alpha. The following patch implements the H-TCP algorithm in it's basic form. Signed-Off-By:
Baruch Even <baruch@ev-en.org> Signed-off-by:
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Stephen Hemminger authored
TCP Vegas code modified for the new TCP infrastructure. Vegas now uses microsecond resolution timestamps for better estimation of performance over higher speed links. Signed-off-by:
Stephen Hemminger <shemminger@osdl.org> Signed-off-by:
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Daniele Lacamera authored
TCP Hybla congestion avoidance. - "In heterogeneous networks, TCP connections that incorporate a terrestrial or satellite radio link are greatly disadvantaged with respect to entirely wired connections, because of their longer round trip times (RTTs). To cope with this problem, a new TCP proposal, the TCP Hybla, is presented and discussed in the paper[1]. It stems from an analytical evaluation of the congestion window dynamics in the TCP standard versions (Tahoe, Reno, NewReno), which suggests the necessary modifications to remove the performance dependence on RTT.[...]"[1] [1]: Carlo Caini, Rosario Firrincieli, "TCP Hybla: a TCP enhancement for heterogeneous networks", International Journal of Satellite Communications and Networking Volume 22, Issue 5 , Pages 547 - 566. September 2004. Signed-off-by: Daniele Lacamera (root at danielinux.net)net Signed-off-by:
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John Heffner authored
Sally Floyd's high speed TCP congestion control. This is useful for comparison and research. Signed-off-by:
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Stephen Hemminger authored
This is the existing 2.6.12 Westwood code moved from tcp_input to the new congestion framework. A lot of the inline functions have been eliminated to try and make it clearer. Signed-off-by:
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Stephen Hemminger authored
TCP BIC congestion control reworked to use the new congestion control infrastructure. This version is more up to date than the BIC code in 2.6.12; it incorporates enhancements from BICTCP 1.1, to handle low latency links. Signed-off-by:
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Stephen Hemminger authored
Update the documentation to remove the old sysctl values and include the new congestion control infrastructure. Includes changes to tcp.txt by Ian McDonald. Signed-off-by:
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Stephen Hemminger authored
Enhancement to the tcp_diag interface used by the iproute2 ss command to report the tcp congestion control being used by a socket. Signed-off-by:
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Stephen Hemminger authored
Signed-off-by:
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Stephen Hemminger authored
Allow TCP to have multiple pluggable congestion control algorithms. Algorithms are defined by a set of operations and can be built in or modules. The legacy "new RENO" algorithm is used as a starting point and fallback. Signed-off-by:
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Russell King authored
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Adrian Bunk authored
This makes the USB_MON less confusing. Signed-off-by:
Adrian Bunk <bunk@stusta.de> Signed-off-by:
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Telemaque Ndizihiwe authored
Clean up tortured logic in sys_open(). Signed-off-by:
Telemaque Ndizihiwe <telendiz@eircom.net> Signed-off-by:
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Alexey Dobriyan authored
tty_register_ldisc(N_FOO, NULL) => tty_unregister_ldisc(N_FOO) Signed-off-by:
Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by:
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