diff options
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/Locking | 12 | ||||
| -rw-r--r-- | Documentation/filesystems/ocfs2.txt | 3 | ||||
| -rw-r--r-- | Documentation/filesystems/proc.txt | 36 | ||||
| -rw-r--r-- | Documentation/filesystems/ramfs-rootfs-initramfs.txt | 12 | ||||
| -rw-r--r-- | Documentation/filesystems/vfat.txt | 32 | ||||
| -rw-r--r-- | Documentation/filesystems/vfs.txt | 39 | ||||
| -rw-r--r-- | Documentation/filesystems/xip.txt | 9 |
7 files changed, 86 insertions, 57 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking index 8362860e21a..23d2f4460de 100644 --- a/Documentation/filesystems/Locking +++ b/Documentation/filesystems/Locking @@ -161,8 +161,12 @@ prototypes: int (*set_page_dirty)(struct page *page); int (*readpages)(struct file *filp, struct address_space *mapping, struct list_head *pages, unsigned nr_pages); - int (*prepare_write)(struct file *, struct page *, unsigned, unsigned); - int (*commit_write)(struct file *, struct page *, unsigned, unsigned); + int (*write_begin)(struct file *, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata); + int (*write_end)(struct file *, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata); sector_t (*bmap)(struct address_space *, sector_t); int (*invalidatepage) (struct page *, unsigned long); int (*releasepage) (struct page *, int); @@ -180,8 +184,6 @@ sync_page: no maybe writepages: no set_page_dirty no no readpages: no -prepare_write: no yes yes -commit_write: no yes yes write_begin: no locks the page yes write_end: no yes, unlocks yes perform_write: no n/a yes @@ -191,7 +193,7 @@ releasepage: no yes direct_IO: no launder_page: no yes - ->prepare_write(), ->commit_write(), ->sync_page() and ->readpage() + ->write_begin(), ->write_end(), ->sync_page() and ->readpage() may be called from the request handler (/dev/loop). ->readpage() unlocks the page, either synchronously or via I/O diff --git a/Documentation/filesystems/ocfs2.txt b/Documentation/filesystems/ocfs2.txt index 4340cc82579..67310fbbb7d 100644 --- a/Documentation/filesystems/ocfs2.txt +++ b/Documentation/filesystems/ocfs2.txt @@ -28,10 +28,7 @@ Manish Singh <manish.singh@oracle.com> Caveats ======= Features which OCFS2 does not support yet: - - extended attributes - quotas - - cluster aware flock - - cluster aware lockf - Directory change notification (F_NOTIFY) - Distributed Caching (F_SETLEASE/F_GETLEASE/break_lease) - POSIX ACLs diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index bcceb99b81d..71df353e367 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -44,6 +44,7 @@ Table of Contents 2.14 /proc/<pid>/io - Display the IO accounting fields 2.15 /proc/<pid>/coredump_filter - Core dump filtering settings 2.16 /proc/<pid>/mountinfo - Information about mounts + 2.17 /proc/sys/fs/epoll - Configuration options for the epoll interface ------------------------------------------------------------------------------ Preface @@ -1338,10 +1339,13 @@ nmi_watchdog Enables/Disables the NMI watchdog on x86 systems. When the value is non-zero the NMI watchdog is enabled and will continuously test all online cpus to -determine whether or not they are still functioning properly. +determine whether or not they are still functioning properly. Currently, +passing "nmi_watchdog=" parameter at boot time is required for this function +to work. -Because the NMI watchdog shares registers with oprofile, by disabling the NMI -watchdog, oprofile may have more registers to utilize. +If LAPIC NMI watchdog method is in use (nmi_watchdog=2 kernel parameter), the +NMI watchdog shares registers with oprofile. By disabling the NMI watchdog, +oprofile may have more registers to utilize. msgmni ------ @@ -2483,4 +2487,30 @@ For more information on mount propagation see: Documentation/filesystems/sharedsubtree.txt +2.17 /proc/sys/fs/epoll - Configuration options for the epoll interface +-------------------------------------------------------- + +This directory contains configuration options for the epoll(7) interface. + +max_user_instances +------------------ + +This is the maximum number of epoll file descriptors that a single user can +have open at a given time. The default value is 128, and should be enough +for normal users. + +max_user_watches +---------------- + +Every epoll file descriptor can store a number of files to be monitored +for event readiness. Each one of these monitored files constitutes a "watch". +This configuration option sets the maximum number of "watches" that are +allowed for each user. +Each "watch" costs roughly 90 bytes on a 32bit kernel, and roughly 160 bytes +on a 64bit one. +The current default value for max_user_watches is the 1/32 of the available +low memory, divided for the "watch" cost in bytes. + + ------------------------------------------------------------------------------ + diff --git a/Documentation/filesystems/ramfs-rootfs-initramfs.txt b/Documentation/filesystems/ramfs-rootfs-initramfs.txt index 62fe9b1e089..a8273d5fad2 100644 --- a/Documentation/filesystems/ramfs-rootfs-initramfs.txt +++ b/Documentation/filesystems/ramfs-rootfs-initramfs.txt @@ -130,12 +130,12 @@ The 2.6 kernel build process always creates a gzipped cpio format initramfs archive and links it into the resulting kernel binary. By default, this archive is empty (consuming 134 bytes on x86). -The config option CONFIG_INITRAMFS_SOURCE (for some reason buried under -devices->block devices in menuconfig, and living in usr/Kconfig) can be used -to specify a source for the initramfs archive, which will automatically be -incorporated into the resulting binary. This option can point to an existing -gzipped cpio archive, a directory containing files to be archived, or a text -file specification such as the following example: +The config option CONFIG_INITRAMFS_SOURCE (in General Setup in menuconfig, +and living in usr/Kconfig) can be used to specify a source for the +initramfs archive, which will automatically be incorporated into the +resulting binary. This option can point to an existing gzipped cpio +archive, a directory containing files to be archived, or a text file +specification such as the following example: dir /dev 755 0 0 nod /dev/console 644 0 0 c 5 1 diff --git a/Documentation/filesystems/vfat.txt b/Documentation/filesystems/vfat.txt index bbac4f1d905..3a5ddc96901 100644 --- a/Documentation/filesystems/vfat.txt +++ b/Documentation/filesystems/vfat.txt @@ -8,6 +8,12 @@ if you want to format from within Linux. VFAT MOUNT OPTIONS ---------------------------------------------------------------------- +uid=### -- Set the owner of all files on this filesystem. + The default is the uid of current process. + +gid=### -- Set the group of all files on this filesystem. + The default is the gid of current process. + umask=### -- The permission mask (for files and directories, see umask(1)). The default is the umask of current process. @@ -36,7 +42,7 @@ codepage=### -- Sets the codepage number for converting to shortname characters on FAT filesystem. By default, FAT_DEFAULT_CODEPAGE setting is used. -iocharset=name -- Character set to use for converting between the +iocharset=<name> -- Character set to use for converting between the encoding is used for user visible filename and 16 bit Unicode characters. Long filenames are stored on disk in Unicode format, but Unix for the most part doesn't @@ -86,6 +92,8 @@ check=s|r|n -- Case sensitivity checking setting. r: relaxed, case insensitive n: normal, default setting, currently case insensitive +nocase -- This was deprecated for vfat. Use shortname=win95 instead. + shortname=lower|win95|winnt|mixed -- Shortname display/create setting. lower: convert to lowercase for display, @@ -99,11 +107,31 @@ shortname=lower|win95|winnt|mixed tz=UTC -- Interpret timestamps as UTC rather than local time. This option disables the conversion of timestamps between local time (as used by Windows on FAT) and UTC - (which Linux uses internally). This is particuluarly + (which Linux uses internally). This is particularly useful when mounting devices (like digital cameras) that are set to UTC in order to avoid the pitfalls of local time. +showexec -- If set, the execute permission bits of the file will be + allowed only if the extension part of the name is .EXE, + .COM, or .BAT. Not set by default. + +debug -- Can be set, but unused by the current implementation. + +sys_immutable -- If set, ATTR_SYS attribute on FAT is handled as + IMMUTABLE flag on Linux. Not set by default. + +flush -- If set, the filesystem will try to flush to disk more + early than normal. Not set by default. + +rodir -- FAT has the ATTR_RO (read-only) attribute. But on Windows, + the ATTR_RO of the directory will be just ignored actually, + and is used by only applications as flag. E.g. it's setted + for the customized folder. + + If you want to use ATTR_RO as read-only flag even for + the directory, set this option. + <bool>: 0,1,yes,no,true,false TODO diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt index c4d348dabe9..5579bda58a6 100644 --- a/Documentation/filesystems/vfs.txt +++ b/Documentation/filesystems/vfs.txt @@ -492,7 +492,7 @@ written-back to storage typically in whole pages, however the address_space has finer control of write sizes. The read process essentially only requires 'readpage'. The write -process is more complicated and uses prepare_write/commit_write or +process is more complicated and uses write_begin/write_end or set_page_dirty to write data into the address_space, and writepage, sync_page, and writepages to writeback data to storage. @@ -521,8 +521,6 @@ struct address_space_operations { int (*set_page_dirty)(struct page *page); int (*readpages)(struct file *filp, struct address_space *mapping, struct list_head *pages, unsigned nr_pages); - int (*prepare_write)(struct file *, struct page *, unsigned, unsigned); - int (*commit_write)(struct file *, struct page *, unsigned, unsigned); int (*write_begin)(struct file *, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata); @@ -598,37 +596,7 @@ struct address_space_operations { readpages is only used for read-ahead, so read errors are ignored. If anything goes wrong, feel free to give up. - prepare_write: called by the generic write path in VM to set up a write - request for a page. This indicates to the address space that - the given range of bytes is about to be written. The - address_space should check that the write will be able to - complete, by allocating space if necessary and doing any other - internal housekeeping. If the write will update parts of - any basic-blocks on storage, then those blocks should be - pre-read (if they haven't been read already) so that the - updated blocks can be written out properly. - The page will be locked. - - Note: the page _must not_ be marked uptodate in this function - (or anywhere else) unless it actually is uptodate right now. As - soon as a page is marked uptodate, it is possible for a concurrent - read(2) to copy it to userspace. - - commit_write: If prepare_write succeeds, new data will be copied - into the page and then commit_write will be called. It will - typically update the size of the file (if appropriate) and - mark the inode as dirty, and do any other related housekeeping - operations. It should avoid returning an error if possible - - errors should have been handled by prepare_write. - - write_begin: This is intended as a replacement for prepare_write. The - key differences being that: - - it returns a locked page (in *pagep) rather than being - given a pre locked page; - - it must be able to cope with short writes (where the - length passed to write_begin is greater than the number - of bytes copied into the page). - + write_begin: Called by the generic buffered write code to ask the filesystem to prepare to write len bytes at the given offset in the file. The address_space should check that the write will be able to complete, @@ -640,6 +608,9 @@ struct address_space_operations { The filesystem must return the locked pagecache page for the specified offset, in *pagep, for the caller to write into. + It must be able to cope with short writes (where the length passed to + write_begin is greater than the number of bytes copied into the page). + flags is a field for AOP_FLAG_xxx flags, described in include/linux/fs.h. diff --git a/Documentation/filesystems/xip.txt b/Documentation/filesystems/xip.txt index 3cc4010521a..0466ee56927 100644 --- a/Documentation/filesystems/xip.txt +++ b/Documentation/filesystems/xip.txt @@ -39,10 +39,11 @@ The block device operation is optional, these block devices support it as of today: - dcssblk: s390 dcss block device driver -An address space operation named get_xip_page is used to retrieve reference -to a struct page. To address the target page, a reference to an address_space, -and a sector number is provided. A 3rd argument indicates whether the -function should allocate blocks if needed. +An address space operation named get_xip_mem is used to retrieve references +to a page frame number and a kernel address. To obtain these values a reference +to an address_space is provided. This function assigns values to the kmem and +pfn parameters. The third argument indicates whether the function should allocate +blocks if needed. This address space operation is mutually exclusive with readpage&writepage that do page cache read/write operations. |