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* tty: tty port zero baud openAlan Cox2009-01-02
| | | | | | | | If we have no speed set at some point then we should not raise DTR/RTS at that point when opening as the tty is not ready Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* tty: ESP has been broken for locking etc forverAlan Cox2009-01-02
| | | | | | | Mark it broken Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* tty: rework stallion to use the tty_port bitsAlan Cox2009-01-02
| | | | | Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* tty: Rework istallion to use the tty port changesAlan Cox2009-01-02
| | | | | Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* tty: Introduce a tty_port generic block_til_readyAlan Cox2009-01-02
| | | | | | | | Start sucking more commonality out of the drivers into a single piece of core code. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* tty: relock the mxser driverAlan Cox2009-01-02
| | | | | Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* tty: relock riscom8 using port locksAlan Cox2009-01-02
| | | | | Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* tty: rocketport uses different port flags to everyone elseAlan Cox2009-01-02
| | | | | | | Normalise them so we can use the common helpers later on Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* tty: relock generic_serialAlan Cox2009-01-02
| | | | | | | | | | | | Switch generic_serial to do port count locking via the tty_port structure ready for moving to a common port wait routine. Keep the old driver lock for internal calling so we don't risk messing up the drivers below until we are ready. Still needs kref conversions Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* isicom: redo locking to use tty port locksAlan Cox2009-01-02
| | | | | | | | This helps set the basis for moving block_til_ready into common code. We also introduce a tty_port_hangup helper as this will also be generally needed. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* tty: Pull the dtr raise into tty portAlan Cox2009-01-02
| | | | | | | | This moves another per device special out of what should be shared open wait paths into private methods Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* rio: Kill off ckmallocAlan Cox2009-01-02
| | | | | | | | This was an alloc/clear wrapper but makes even less sense now it uses kzalloc. Kill it off. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* tty_port: Add a port level carrier detect operationAlan Cox2009-01-02
| | | | | | | | This is the first step to generalising the various pieces of waiting logic duplicated in all sorts of serial drivers. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* tty: Fix PPP hang under loadAlan Cox2009-01-02
| | | | | Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* CRED: Wrap task credential accesses in the devpts filesystemDavid Howells2009-01-02
| | | | | | | | | | | | | | | Wrap access to task credentials so that they can be separated more easily from the task_struct during the introduction of COW creds. Change most current->(|e|s|fs)[ug]id to current_(|e|s|fs)[ug]id(). Change some task->e?[ug]id to task_e?[ug]id(). In some places it makes more sense to use RCU directly rather than a convenient wrapper; these will be addressed by later patches. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Add device function for USB serial consoleKevin Hao2009-01-02
| | | | | | | | | | | Add device funtion for usb serial console, so we can open /dev/console when we use a usb serial device as console. (Typecast removed as noted by Sergei Shtylyov) Signed-off-by: Kevin Hao <kexin.hao@windriver.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* And here's a patch (to be applied on top of the last) which preventsRussell King2009-01-02
| | | | | | | | this happening again by making use of 'const'. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Convert the oxsemi tornado special cases to use the quirk interface and notRussell King2009-01-02
| | | | | | | | scribble on its own reference structures. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* devpts: fix unused function warningAndrew Morton2009-01-02
| | | | | | | | fs/devpts/inode.c:324: warning: 'compare_init_pts_sb' defined but not used Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* tty: Fix close races in USB serialAlan Cox2009-01-02
| | | | | | | | | | | USB serial has always had races where the tty port usage count can hit zero during a receive event. The internal locking is a mutex so we can't use that in the IRQ handlers. With krefs we can tackle this differently but we still need to be careful. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* n_tty: Output bells immediately on a full bufferJoe Peterson2009-01-02
| | | | | | | | | | | | | | This patch causes "bell" (^G) characters (invoked when the input buffer is full) to be immediately output rather than filling the echo buffer. This is especially a problem when the tty is stopped and buffers fill, since the bells do not serve their purpose of immediate notification that the buffer cannot take further input, and they will flush all at once when the tty is restarted. Signed-off-by: Joe Peterson <joe@skyrush.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* n_tty: Fix hanfling of buffer full corner casesJoe Peterson2009-01-02
| | | | | | | | | | | | | | | | | | | | Fix the handling of input characters when the tty buffer is full or nearly full. This includes tests that are done in n_tty_receive_char() and handling of PARMRK. Problems with the buffer-full tests done in receive_char() caused characters to be lost at times when the buffer(s) filled. Also, these full conditions would often only be detected with echo on, and PARMRK was not accounted for properly in all cases. One symptom of these problems, in addition to lost characters, was early termination from unix commands like tr and cat when ^Q was used to break from a stopped tty with full buffers (note that breaking out was often previously not possible, due to the pty getting in "gridlock", which will be addressed in another patch). Note space is always reserved at the end of the buffer for a newline (or EOF/EOL) in canonical mode. Signed-off-by: Joe Peterson <joe@skyrush.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* n_tty: Fix handling of control characters and continuationsJoe Peterson2009-01-02
| | | | | | | | | | Fix process_output_block to detect continuation characters correctly and to handle control characters even when O_OLCUC is enabled. Make similar change to do_output_char(). Signed-off-by: Joe Peterson <joe@skyrush.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* pty: simplify resizeAlan Cox2009-01-02
| | | | | | | | We have special case logic for resizing pty/tty pairs. We also have a per driver resize method so for the pty case we should use it. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* tty: Fix sparse static warning for tty_driver_lookup_ttyJason Wessel2009-01-02
| | | | | | | | | Fixed sparse warning: drivers/char/tty_io.c:1216:19: warning: symbol 'tty_driver_lookup_tty' was not declared. Should it be static? Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* sierra: Fix formattingAlan Cox2009-01-02
| | | | | | | | | | | | | | | | Andrew Morton wrote: in drivers/usb/serial/sierra.c: } else { if (urb->actual_length) { + tty = tty_port_tty_get(&port->port); tty_buffer_request_room(tty, urb->actual_length); it's missing a tab. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* devpts: Coding style clean upAlan Cox2009-01-02
| | | | | | | Just nail the oddments now while this code is being touched Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Document usage of multiple-instances of devptsSukadev Bhattiprolu2009-01-02
| | | | | | | | | | Changelog [v2]: - Add note indicating strict isolation is not possible unless all mounts of devpts use the 'newinstance' mount option. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Enable multiple instances of devptsSukadev Bhattiprolu2009-01-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | To support containers, allow multiple instances of devpts filesystem, such that indices of ptys allocated in one instance are independent of ptys allocated in other instances of devpts. But to preserve backward compatibility, enable this support for multiple instances only if: - CONFIG_DEVPTS_MULTIPLE_INSTANCES is set to Y, and - '-o newinstance' mount option is specified while mounting devpts To use multi-instance mount, a container startup script could: $ ns_exec -cm /bin/bash $ umount /dev/pts $ mount -t devpts -o newinstance lxcpts /dev/pts $ mount -o bind /dev/pts/ptmx /dev/ptmx $ /usr/sbin/sshd -p 1234 where 'ns_exec -cm /bin/bash' is calls clone() with CLONE_NEWNS flag and execs /bin/bash in the child process. A pty created by the sshd is not visible in the original mount of /dev/pts. USER-SPACE-IMPACT: - See Documentation/fs/devpts.txt (included in next patch) for user- space impact in multi-instance and mixed-mode operation. TODO: - Update mount(8), pts(4) man pages. Highlight impact of not redirecting /dev/ptmx to /dev/pts/ptmx after a multi-instance mount. Changelog[v6]: - [Dave Hansen] Use new get_init_pts_sb() interface - [Serge Hallyn] Don't bother displaying 'newinstance' in show_options - [Serge Hallyn] Use macros (PARSE_REMOUNT/PARSE_MOUNT) instead of 0/1. - [Serge Hallyn] Check error return from get_sb_single() (now get_init_pts_sb()) - devpts_pty_kill(): don't dput error dentries Changelog[v5]: - Move get_sb_ref() definition to earlier patch - Move usage info to Documentation/filesystems/devpts.txt (next patch) - Make ptmx node even in init_pts_ns, now that default mode is 0000 (defined in earlier patch, enabled here). - Cache ptmx dentry and use to update mode during remount (defined in earlier patch, enabled here). - Bugfix: explicitly ignore newinstance on remount (if newinstance was specified on remount of initial mount, it would be ignored but /proc/mounts would imply that the option was set) Changelog[v4]: - Update patch description to address H. Peter Anvin's comments - Consolidate multi-instance mode code under new config token, CONFIG_DEVPTS_MULTIPLE_INSTANCE. - Move usage-details from patch description to Documentation/fs/devpts.txt Changelog[v3]: - Rename new mount option to 'newinstance' - Create ptmx nodes only in 'newinstance' mounts - Bugfix: parse_mount_options() modifies @data but since we need to parse the @data twice (once in devpts_get_sb() and once during do_remount_sb()), parse a local copy of @data in devpts_get_sb(). (restructured code in devpts_get_sb() to fix this) Changelog[v2]: - Support both single-mount and multiple-mount semantics and provide '-onewmnt' option to select the semantics. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Define get_init_pts_sb()Sukadev Bhattiprolu2009-01-02
| | | | | | | | | | | | | See comments in the function header for details. The new interface will be used in a follow-on patch. Changelog [v2]: [Dave Hansen] Replace get_sb_ref() in fs/super.c with get_init_pts_sb() and make the new interface private to devpts Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Define mknod_ptmx()Sukadev Bhattiprolu2009-01-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | /dev/ptmx is closely tied to the devpts filesystem. An open of /dev/ptmx, allocates the next pty index and the associated device shows up in the devpts fs as /dev/pts/n. Wih multiple instancs of devpts filesystem, during an open of /dev/ptmx we would be unable to determine which instance of the devpts is being accessed. So we move the 'ptmx' node into /dev/pts and use the inode of the 'ptmx' node to identify the superblock and hence the devpts instance. This patch adds ability for the kernel to internally create the [ptmx, c, 5:2] device when mounting devpts filesystem. Since the ptmx node in devpts is new and may surprise some userspace scripts, the default permissions for the new node is 0000. These permissions can be changed either using chmod or by remounting with the new '-o ptmxmode=0666' mount option. Changelog[v5]: - [Serge Hallyn bugfix]: Letting new_inode() assign inode number to ptmx can collide with hand-assigning inode numbers to ptys. So, hand-assign specific inode number to ptmx node also. - [Serge Hallyn]: Maybe safer to grab root dentry mutex while creating ptmx node - [Bugfix with Serge Hallyn] Replace lookup_one_len() in mknod_ptmx() wih d_alloc_name() (lookup during ->get_sb() locks up system). To simplify patchset, fold the ptmx_dentry patch into this. Changelog[v4]: - Change default permissions of pts/ptmx node to 0000. - Move code for ptmxmode under #ifdef CONFIG_DEVPTS_MULTIPLE_INSTANCES. Changelog[v3]: - Rename ptmx_mode to ptmxmode (for consistency with 'newinstance') Changelog[v2]: - [H. Peter Anvin] Remove mknod() system call support and create the ptmx node internally. Changelog[v1]: - Earlier version of this patch enabled creating /dev/pts/tty as well. As pointed out by Al Viro and H. Peter Anvin, that is not really necessary. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Add DEVPTS_MULTIPLE_INSTANCES config tokenSukadev Bhattiprolu2009-01-02
| | | | | | Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Extract option parsing to new functionSukadev Bhattiprolu2009-01-02
| | | | | | | | | Move code to parse mount options into a separate function so it can (later) be shared between mount and remount operations. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Per-mount 'config' objectSukadev Bhattiprolu2009-01-02
| | | | | | | | | | With support for multiple mounts of devpts, the 'config' structure really represents per-mount options rather than config parameters. Rename 'config' structure to 'pts_mount_opts' and store it in the super-block. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Per-mount allocated_ptysSukadev Bhattiprolu2009-01-02
| | | | | | | | | | | | | To enable multiple mounts of devpts, 'allocated_ptys' must be a per-mount variable rather than a global variable. Move 'allocated_ptys' into the super_block's s_fs_info. Changelog[v2]: Define and use DEVPTS_SB() wrapper. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Remove devpts_root globalSukadev Bhattiprolu2009-01-02
| | | | | | | | | | | | | Remove the 'devpts_root' global variable and find the root dentry using the super_block. The super-block can be found from the device inode, using the new wrapper, pts_sb_from_inode(). Changelog: This patch is based on an earlier patchset from Serge Hallyn and Matt Helsley. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* n_tty: clean up coding styleAlan Cox2009-01-02
| | | | | | | Now the main work is done its polishing time Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* n_tty: Fix loss of echoed characters and remove bkl from n_ttyJoe Peterson2009-01-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fixes the loss of echoed (and other ldisc-generated characters) when the tty is stopped or when the driver output buffer is full (happens frequently for input during continuous program output, such as ^C) and removes the Big Kernel Lock from the N_TTY line discipline. Adds an "echo buffer" to the N_TTY line discipline that handles all ldisc-generated output (including echoed characters). Along with the loss of characters, this also fixes the associated loss of sync between tty output and the ldisc state when characters cannot be immediately written to the tty driver. The echo buffer stores (in addition to characters) state operations that need to be done at the time of character output (like management of the column position). This allows echo to cooperate correctly with program output, since the ldisc state remains consistent with actual characters written. Since the echo buffer code now isolates the tty column state code to the process_out* and process_echoes functions, we can remove the Big Kernel Lock (BKL) and replace it with mutex locks. Highlights are: * Handles echo (and other ldisc output) when tty driver buffer is full - continuous program output can block echo * Saves echo when tty is in stopped state (e.g. ^S) - (e.g.: ^Q will correctly cause held characters to be released for output) * Control character pairs (e.g. "^C") are treated atomically and not split up by interleaved program output * Line discipline state is kept consistent with characters sent to the tty driver * Remove the big kernel lock (BKL) from N_TTY line discipline Signed-off-by: Joe Peterson <joe@skyrush.com> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Blackfin Serial Driver: Remove BI status for known_good_charSonic Zhang2009-01-02
| | | | | | | Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Blackfin Serial Driver: Fix bug - BF527-EZKIT unable to receive large files ↵Sonic Zhang2009-01-02
| | | | | | | | | | | over UART in DMA mode Add spin_lock_irqsave() when receive and transfer data. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Blackfin Serial Driver: Clean serial console and early prink code.Sonic Zhang2009-01-02
| | | | | | | Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Blackfin Serial Driver: fix bug - SIR driver stop receiving randomlyGraf Yang2009-01-02
| | | | | | | | | | | | | | | | | | | | | | | | | Bug description: The IRDA receiver may can't receiving any more after processed some signals. To duplicate this issue is put three IRDA devices together, one blackfin, two none blackfin, they will detect each other. Let one none blackfin devices irdaping the blackfin devices, when it stopped print out ping information, it is the time that blackfin stoped receiving, the time is random. The related register bit is OK, the other devices is sending data continuously. But no interrupt come. Fixing: I tried Michael's suggestion that request the UARTx error interrupt, and reset the IRDA when found FE error. This method helps much, but it can't completely avoid stop. Reset the IRDA before every time sending the data is more safe. Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Blackfin Serial Driver: updates kgdb over Blackfin serial driver with kgdb ↵Sonic Zhang2009-01-02
| | | | | | | | | framework Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'for-linus' of ↵Linus Torvalds2008-12-31
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (34 commits) nfsd race fixes: jfs nfsd race fixes: reiserfs nfsd race fixes: ext4 nfsd race fixes: ext3 nfsd race fixes: ext2 nfsd/create race fixes, infrastructure filesystem notification: create fs/notify to contain all fs notification fs/block_dev.c: __read_mostly improvement and sb_is_blkdev_sb utilization kill ->dir_notify() filp_cachep can be static in fs/file_table.c fix f_count description in Documentation/filesystems/files.txt make INIT_FS use the __RW_LOCK_UNLOCKED initialization take init_fs to saner place kill vfs_permission pass a struct path * to may_open kill walk_init_root remove incorrect comment in inode_permission expand some comments (d_path / seq_path) correct wrong function name of d_put in kernel document and source comment fix switch_names() breakage in short-to-short case ...
| * nfsd race fixes: jfsDave Kleikamp2008-12-31
| | | | | | | | | | | | | | jfs version of Al Viro's nfsd race patches Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * nfsd race fixes: reiserfsAl Viro2008-12-31
| | | | | | | | | | | | | | ... and the same for reiserfs. The difference here is that we need insert_inode_locked4() to match iget5_locked(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * nfsd race fixes: ext4Al Viro2008-12-31
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * nfsd race fixes: ext3Al Viro2008-12-31
| | | | | | | | | | | | ext3 analog of the previous patch Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * nfsd race fixes: ext2Al Viro2008-12-31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * make ext2_new_inode() put the inode into icache in locked state * do not unlock until the inode is fully set up; otherwise nfsd might pick it in half-baked state. * make sure that ext2_new_inode() does *not* lead to two inodes with the same inumber hashed at the same time; otherwise a bogus fhandle coming from nfsd might race with inode creation: nfsd: iget_locked() creates inode nfsd: try to read from disk, block on that. ext2_new_inode(): allocate inode with that inumber ext2_new_inode(): insert it into icache, set it up and dirty ext2_write_inode(): get the relevant part of inode table in cache, set the entry for our inode (and start writing to disk) nfsd: get CPU again, look into inode table, see nice and sane on-disk inode, set the in-core inode from it oops - we have two in-core inodes with the same inumber live in icache, both used for IO. Welcome to fs corruption... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * nfsd/create race fixes, infrastructureAl Viro2008-12-31
| | | | | | | | | | | | | | | | | | | | | | | | | | new helpers - insert_inode_locked() and insert_inode_locked4(). Hash new inode, making sure that there's no such inode in icache already. If there is and it does not end up unhashed (as would happen if we have nfsd trying to resolve a bogus fhandle), fail. Otherwise insert our inode into hash and succeed. In either case have i_state set to new+locked; cleanup ends up being simpler with such calling conventions. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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