- 09 Sep, 2005 40 commits
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Miklos Szeredi authored
This patch removes a long lasting "hack" in FUSE, which used a separate channel (a file descriptor refering to a disk-file) to transfer directory contents from userspace to the kernel. The patch adds three new operations (OPENDIR, READDIR, RELEASEDIR), which have semantics and implementation exactly maching the respective file operations (OPEN, READ, RELEASE). This simplifies the directory reading code. Also disk space is not necessary, which can be important in embedded systems. Signed-off-by:
Miklos Szeredi <miklos@szeredi.hu> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Miklos Szeredi authored
This patch adds support for the "direct_io" mount option of FUSE. When this mount option is specified, the page cache is bypassed for read and write operations. This is useful for example, if the filesystem doesn't know the size of files before reading them, or when any kind of caching is harmful. Signed-off-by:
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Miklos Szeredi authored
Check for the presence of all mandatory mount options. Signed-off-by:
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Miklos Szeredi authored
This patch tightens the check for allowing processes to access non-privileged mounts. The rational is that the filesystem implementation can control the behavior or get otherwise unavailable information of the filesystem user. If the filesystem user process has the same uid, gid, and is not suid or sgid application, then access is safe. Otherwise access is not allowed unless the "allow_other" mount option is given (for which policy is controlled by the userspace mount utility). Thanks to everyone linux-fsdevel, especially Martin Mares who helped uncover problems with the previous approach. Signed-off-by:
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Miklos Szeredi authored
This patch adds readpages support to FUSE. With the help of the readpages() operation multiple reads are bundled together and sent as a single request to userspace. This can improve reading performace. Signed-off-by:
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Miklos Szeredi authored
Add padding to structures to make sizes the same on 32bit and 64bit archs. Initial testing and test machine generously provided by Franco Broi. Signed-off-by:
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Miklos Szeredi authored
This patch adds the extended attribute operations to FUSE. The following operations are added: o getxattr o setxattr o listxattr o removexattr Signed-off-by:
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Miklos Szeredi authored
This patch adds miscellaneous mount options to the FUSE filesystem. The following mount options are added: o default_permissions: check permissions with generic_permission() o allow_other: allow other users to access files o allow_root: allow root to access files o kernel_cache: don't invalidate page cache on open Signed-off-by:
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Miklos Szeredi authored
This patch adds the file operations of FUSE. The following operations are added: o open o flush o release o fsync o readpage o commit_write Signed-off-by:
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Miklos Szeredi authored
This patch adds the write filesystem operations of FUSE. The following operations are added: o setattr o symlink o mknod o mkdir o create o unlink o rmdir o rename o link Signed-off-by:
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Miklos Szeredi authored
This patch adds the read-only filesystem operations of FUSE. This contains the following files: o dir.c - directory, symlink and file-inode operations The following operations are added: o lookup o getattr o readlink o follow_link o directory open o readdir o directory release o permission o dentry revalidate o statfs Signed-off-by: -
Miklos Szeredi authored
This adds the FUSE device handling functions. This contains the following files: o dev.c - fuse device operations (read, write, release, poll) - registers misc device - support for sending requests to userspace Signed-off-by:Adrian Bunk <bunk@stusta.de> Signed-off-by:
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Miklos Szeredi authored
This patch adds FUSE core. This contains the following files: o inode.c - superblock operations (alloc_inode, destroy_inode, read_inode, clear_inode, put_super, show_options) - registers FUSE filesystem o fuse_i.h - private header file Requirements ============ The most important difference between orinary filesystems and FUSE is the fact, that the filesystem data/metadata is provided by a userspace process run with the privileges of the mount "owner" instead of the kernel, or some remote entity usually running with elevated privileges. The security implication of this is that a non-privileged user must not be able to use this capability to compromise the system. Obvious requirements arising from this are: - mount owner should not be able to get elevated privileges with the help of the mounted filesystem - mount owner should not be able to induce undesired behavior in other users' or the super user's processes - mount owner should not get illegitimate access to information from other users' and the super user's processes These are currently ensured with the following constraints: 1) mount is only allowed to directory or file which the mount owner can modify without limitation (write access + no sticky bit for directories) 2) nosuid,nodev mount options are forced 3) any process running with fsuid different from the owner is denied all access to the filesystem 1) and 2) are ensured by the "fusermount" mount utility which is a setuid root application doing the actual mount operation. 3) is ensured by a check in the permission() method in kernel I started thinking about doing 3) in a different way because Christoph H. made a big deal out of it, saying that FUSE is unacceptable into mainline in this form. The suggested use of private namespaces would be OK, but in their current form have many limitations that make their use impractical (as discussed in this thread). Suggested improvements that would address these limitations: - implement shared subtrees - allow a process to join an existing namespace (make namespaces first-class objects) - implement the namespace creation/joining in a PAM module With all that in place the check of owner against current->fsuid may be removed from the FUSE kernel module, without compromising the security requirements. Suid programs still interesting questions, since they get access even to the private namespace causing some information leak (exact order/timing of filesystem operations performed), giving some ptrace-like capabilities to unprivileged users. BTW this problem is not strictly limited to the namespace approach, since suid programs setting fsuid and accessing users' files will succeed with the current approach too. Signed-off-by: -
Miklos Szeredi authored
This patch adds FUSE filesystem to MAINTAINERS, fs/Kconfig and fs/Makefile. Signed-off-by:
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Ben Dooks authored
The URL for Documentation/sparse is wrong now that it is in git. Signed-off-by:
Ben Dooks <ben-linux@fluff.org> Signed-off-by:
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Pekka J Enberg authored
This patch brings the now out-of-date Documentation/filesystems/vfs.txt back to life. Thanks to Carsten Otte, Trond Myklebust, and Anton Altaparmakov for their help on updating this documentation. Signed-off-by:
Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by:
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Vivek Goyal authored
There are minor changes in command line options in kexec-tools for kdump. This patch updates the documentation to reflect those changes. Signed-off-by:
Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by:
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Martin Waitz authored
This patch changes a macro definition so that kernel-doc can understand it. Signed-off-by:
Martin Waitz <tali@admingilde.org> Signed-off-by:
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Pekka Enberg authored
This patch clarifies NULL handling of kfree() and vfree(). I addition, wording of calling context restriction for vfree() and vunmap() are changed from "may not" to "must not." Signed-off-by:
Manfred Spraul <manfred@colorfullife.com> Signed-off-by:
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Chuck Ebbert authored
Someone complained about the docs for vm_overcommit_memory being wrong. This patch copies the text from the vm documentation into procfs. Signed-off-by:
Chuck Ebbert <76306.1226@compuserve.com> Signed-off-by:
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Pierre Ossman authored
Documentation for how the ISA DMA controller is handled in the kernel. Signed-off-by:
Pierre Ossman <drzeus@drzeus.cx> Signed-off-by:
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Jesper Juhl authored
Add a new document describing the major kernel trees and how to apply their patches. Signed-off-by:
Jesper Juhl <jesper.juhl@gmail.com> Signed-off-by:
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Rusty Russell authored
Update the hacking guide, before CONFIG_PREEMPT_RT goes in and it needs rewriting again. Changes include modernization of quotes, removal of most references to bottom halves (some mention required because we still use bh in places to mean softirq). It would be nice to have a discussion of sparse and various annotations. Please send patches straight to akpm. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (authored) Signed-off-by:
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Arnaud Patard authored
This patch add the plateform specific stuff needed to configure and use the driver. Signed-Off-By:
Arnaud Patard <arnaud.patard@rtp-net.org> Signed-off-by:
Antonino Daplas <adaplas@pol.net> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Ben Dooks <ben@trinity.fluff.org> Signed-off-by:
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Arnaud Patard authored
This set of two patches add support for the framebuffer of the Samsung S3C2410 ARM SoC. This driver was started about one year ago and is now used on iPAQ h1930/h1940, Acer n30 and probably other s3c2410-based machines I'm not aware of. I've also heard yesterday that it's working also on iPAQ rx3715/rx3115 (s3c2440-based machines). Signed-Off-By:
Ben Dooks <ben@trinity.fluff.org> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by:
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Olaf Hering authored
Quiet an incorrect warning in aty128fb and radeonfb about the PCI ROM content. Macs work just find without that signature. Signed-off-by:
Olaf Hering <olh@suse.de> Signed-off-by:
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Antonino A. Daplas authored
Stop LCD displays from flickering during high loads. Signed-off-by:
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Antonino A. Daplas authored
Add ddc/i2c support for i810fb. This will allow the driver to get display information, especially for monitors with fickle timings. The i2c support depends on CONFIG_FB_I810_GTF. Changed __init* to __devinit* Signed-off-by:
Alexander Nyberg <alexn@telia.com> Signed-off-by:
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Antonino A. Daplas authored
The function bit_putcs() in drivers/video/console/bitblit.c is becoming large. Break it up into its component functions (bit_putcs_unaligned and bit_putcs_aligned). Incorporated fb_pad_aligned_buffer() optimization by Roman Zippel. Signed-off-by:
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Richard Purdie authored
To solve touchscreen interference problems devices like the Sharp Zaurus SL-C3000 need to know the length of the horitzontal sync pulses. This patch adds a hook to pxafb so the touchscreen driver can function correctly. Signed-Off-By:
Richard Purdie <rpurdie@rpsys.net> Signed-off-by:
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Antonino A. Daplas authored
The var structure in calc_mode_timings is not properly initialized (zero set) which leads to undefined behavior when it is passed to fb_get_mode(). Signed-off-by:
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Antonino A. Daplas authored
nvidiafb_imageblit converts the bitdata stream from big_endian to little endian. This produces mirrored characters when machine is big_endian. Do not endian convert on big endian machines. Signed-off-by:
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Antonino A. Daplas authored
If console is blanked or in KD_GRAPHICS mode, delete cursor timer. No sense flashing the cursor when there's nothing to be seen. Signed-off-by:
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Antonino A. Daplas authored
Make "mode_option" available when compiled as a module. Signed-off-by:
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Antonino A. Daplas authored
If no EDID block is probed, if the display is digital and if no mode option is specified by the user, get the timings by CVT instead of using the global mode database. Signed-off-by:
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Antonino A. Daplas authored
The Coordinated Video Timings (CVT) is the latest standard approved by VESA concerning video timings generation. It addresses the limitation of GTF which is designed mainly for CRT displays. CRT's have a high blanking requirement (as much as 25% of the horizontal frame length) which artificially increases the pixelclock. Digital displays, on the other hand, needs to conserve the pixelclock as much as possible. The GTF also does not take into account the different aspect ratios in its calculation. The new function added is fb_find_mode_cvt(). It is called by fb_find_mode() if it recognizes a mode option string formatted for CVT. The format is: <xres>x<yres>[M][R][-<bpp>][<at-sign><refresh>][i][m] The 'M' tells the function to calculate using CVT. On it's own, it will compute a timing for CRT displays at 60Hz. If the 'R' is specified, 'reduced blanking' computation will be used, best for flatpanels. The 'i' and the 'm' is for 'interlaced mode' and 'with margins' respectively. To determine if CVT was used, check for dmesg for something like this: CVT Mode - <pix>M<n>[-R], ie: .480M3-R (800x600 reduced blanking) where: pix - product of xres and yres, in MB M - is a CVT mode n - the aspect ratio (3 - 4:3; 4 - 5:4; 9 - 16:9, 15:9; A - 16:10) -R - reduced blanking Signed-off-by: -
Daniel Burcaw authored
This patch changes radeon to request only resources 0 and 2 instead of all 3. This works around problems with some setups where BAR 1 (IO BAR) has not been assigned by the firmware since it's not used on the machine and the kernel fails to assign something to it due to the card being between a P2P bridge that was configured without an IO range at all. This typically fixes radeonfb on some Apple Xserve G5 machines Signed-off-by:
Daniel Burcaw <dburcaw@terrasoftsolutions.com> Signed-off-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by:
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Knut Petersen authored
This trivial patch gives a performance boost to the framebuffer console Constructing the bitmaps that are given to the bitblit functions of the framebuffer drivers is time consuming. Here we avoide a call to the slow fb_pad_aligned_buffer(). The patch replaces that call with a simple but much more efficient bytewise copy. The kernel spends a significant time at this place if you use 8x* fonts. Every pixel displayed on your screen is prepared here. Some benchmark results: Displaying a file of 2000 lines with 160 characters each takes 889 ms system time using cyblafb on my system (I´m using a 1280x1024 video mode, resulting in a 160x64 character console) Displaying the same file with the enclosed patch applied to 2.6.13 only takes 760 ms system time, saving 129 ms or 14.5%. Font widths other than 8 are not affected. The advantage and correctness of this patch should be obvious. Signed-off-by:
Knut Petersen <Knut_Petersen@t-online.de> Signed-off-by:
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Knut Petersen authored
This is a framebuffer driver for the Cyberblade/i1 graphics core. Currently tridenfb claims to support the cyberblade/i1 graphics core. This is of very limited truth. Even vesafb is faster and provides more working modes and a much better quality of the video signal. There is a great number of bugs in tridentfb ... but most often it is impossible to decide if these bugs are real bugs or if fixing them for the cyberblade/i1 core would break support for one of the other supported chips. Tridentfb seems to be unmaintained,and documentation for most of the supported chips is not available. So "fixing" cyberblade/i1 support inside of tridentfb was not an option, it would have caused numerous if(CYBERBLADEi1) else ... cases and would have rendered the code to be almost unmaintainable. A first version of this driver was published on 2005-07-31. A fix for a bug reported by Jochen Hein was integrated as well as some changes requested by Antonino A. Daplas. A message has been added to tridentfb to inform current users of tridentfb to switch to cyblafb if the cyberblade/i1 graphics core is detected. This patch is one logical change, but because of the included documentation it is bigger than 70kb. Therefore it is not sent to lkml and linux-fbdev-devel, Signed-off-by:
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Olaf Hering authored
err remains uninitialized of pci_request_regions fails. Found by Thorsten Kukuk, I added a few more checks. Signed-off-by:
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