| /linux/Documentation/filesystems/fuse/ |
| H A D | fuse.rst | 10 Userspace filesystem:
11 A filesystem in which data and metadata are provided by an ordinary
12 userspace process. The filesystem can be accessed normally through
16 The process(es) providing the data and metadata of the filesystem.
19 A userspace filesystem mounted by a non-privileged (non-root) user.
20 The filesystem daemon is running with the privileges of the mounting
25 A connection between the filesystem daemon and the kernel. The
26 connection exists until either the daemon dies, or the filesystem is
27 umounted. Note that detaching (or lazy umounting) the filesystem
29 the last reference to the filesystem is released.
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| H A D | fuse-passthrough.rst | 18 the backing file on a lower filesystem) with the FUSE kernel module. The kernel
33 1. The FUSE filesystem must be compiled with ``CONFIG_FUSE_PASSTHROUGH``
79 file is still open by the system on behalf of the FUSE filesystem. This
102 filesystem stacking scenarios if unprivileged users could set up passthrough.
103 A FUSE passthrough filesystem might use a backing file that resides:
105 * On the *same* FUSE filesystem.
106 * On another filesystem (like OverlayFS) which itself might have an upper or
107 lower layer that is a FUSE filesystem.
110 filesystem shutdown or unmount sequences, leading to deadlocks or system
115 filesystem stacking depth (``sb->s_stack_depth`` and ``fc->max_stack_depth``).
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| /linux/fs/ext4/ |
| H A D | Kconfig | 3 tristate "The Extended 4 (ext4) filesystem"
11 This is the next generation of the ext3 filesystem.
13 Unlike the change from ext2 filesystem to ext3 filesystem,
16 physical block numbers. The ext4 filesystem also supports delayed
22 The ext4 filesystem supports mounting an ext3 filesystem; while there
25 features in the filesystem using tune2fs, or formatting a new
26 filesystem as an ext4 filesystem initially. Without explicit enabling
27 of ext4 features, the on disk filesystem format stays fully backward
63 labels in the ext4 filesystem.
72 Enables run-time debugging support for the ext4 filesystem.
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| /linux/Documentation/filesystems/ |
| H A D | idmappings.rst | 6 Most filesystem developers will have encountered idmappings. They are used when
8 for permission checking. This document is aimed at filesystem developers that
157 outside of the filesystem context. This is best left to an explanation of user
173 ownership of a file is read from disk by a filesystem, the userspace id is
177 For instance, consider a file that is stored on disk by a filesystem as being
180 - If a filesystem were to be mounted in the initial user namespaces (as most
186 - If a filesystem were to be mounted with an idmapping of ``u0:k10000:r10000``
233 into a kernel id according to the idmapping associated with the filesystem.
234 Let's assume the filesystem was mounted with an idmapping of
241 according to the filesystem's idmapping as this would give the wrong owner if
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| H A D | ext2.rst | 11 filesystem in use by Linux. There are also implementations available
17 Most defaults are determined by the filesystem superblock, and can be
33 errors=continue Keep going on a filesystem error.
34 errors=remount-ro Remount the filesystem read-only on an error.
88 which is decided when the filesystem is created. Smaller blocks mean
90 and also impose other limits on the size of files and the filesystem.
115 to mounting the filesystem. Since it is so important, backup copies of
116 the superblock are stored in block groups throughout the filesystem.
125 number of inodes and blocks in the filesystem and how many are free,
126 how many inodes and blocks are in each block group, when the filesystem
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| H A D | overlayfs.rst | 10 overlay-filesystem functionality in Linux (sometimes referred to as
11 union-filesystems). An overlay-filesystem tries to present a
12 filesystem which is the result of overlaying one filesystem on top
19 The overlay filesystem approach is 'hybrid', because the objects that
20 appear in the filesystem do not always appear to belong to that filesystem.
22 from accessing the corresponding object from the original filesystem.
25 While directories will report an st_dev from the overlay-filesystem,
26 non-directory objects may report an st_dev from the lower filesystem or
27 upper filesystem that is providing the object. Similarly st_ino will
33 filesystem, all objects will report an st_dev from the overlay
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| H A D | mount_api.rst | 11 (2) The filesystem context.
13 (3) The filesystem context operations.
17 (5) VFS filesystem context API.
31 (1) Create a filesystem context.
52 The first is invoked to set up the filesystem-specific parts of a filesystem
57 Note that security initialisation is done *after* the filesystem is called so
64 The creation and reconfiguration of a superblock is governed by a filesystem
92 These are operations that can be done on a filesystem context (see
100 A pointer to the file_system_type of the filesystem that is being
107 A pointer to the file system's private data. This is where the filesystem
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| H A D | hfs.rst | 8 .. Note:: This filesystem doesn't have a maintainer.
11 HFS stands for ``Hierarchical File System`` and is the filesystem used
14 MacOS 8.1 and newer support a filesystem called HFS+ that's similar to
15 HFS but is extended in various areas. Use the hfsplus filesystem driver
22 When mounting an HFS filesystem, the following options are accepted:
37 Select the CDROM session to mount as HFS filesystem. Defaults to
54 HFS is not a UNIX filesystem, thus it does not have the usual features you'd
70 * Copying files to a different filesystem will loose those attributes
78 hformat that can be used to create HFS filesystem. See
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| H A D | directory-locking.rst | 7 kinds of locks - per-inode (->i_rwsem) and per-filesystem
55 * lock the filesystem
96 and fail the lookup if it is. Then we try to lock the filesystem and the
101 Note that splicing does *not* involve any modification of the filesystem;
104 filesystem lock prevents any changes of tree topology, other than having a
107 the filesystem lock, their relationship will remain unchanged until
114 Multiple-filesystem stuff
118 another filesystem; it may be ecryptfs doing operation in the underlying
119 filesystem, overlayfs doing something to the layers, network filesystem
122 directory operation on this filesystem might involve directory operations
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| H A D | qnx6.rst | 13 mmi_fs Mount filesystem as used for example by Audi MMI 3G system
32 size of 512, 1024, 2048 or 4096, which is decided when the filesystem is
41 The superblock contains all global information about the filesystem.
50 (or period) and building up a new (stable) filesystem structure under the
53 Each superblock holds a set of root inodes for the different filesystem
75 information (total number of filesystem blocks) or by taking the highest
80 blocksize of the filesystem.
85 Each object in the filesystem is represented by an inode. (index node)
86 The inode structure contains pointers to the filesystem blocks which contain
106 A directory is a filesystem object and has an inode just like a file.
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| H A D | befs.rst | 4 BeOS filesystem for Linux
36 This filesystem doesn't have a maintainer.
40 This module implements the native filesystem of BeOS http://www.beincorporated.com/
49 filesystem is called befs.
81 filesystem (experimental)", or something like that. Enable that option
93 To use the BeOS filesystem, use filesystem type 'befs'.
123 Dominic Giampalo ... Writing "Practical file system design with Be filesystem"
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| H A D | ext3.rst | 11 Ext3 is the ext2 filesystem enhanced with journalling capabilities. The
12 filesystem is a subset of ext4 filesystem so use ext4 driver for accessing
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| /linux/Documentation/filesystems/ext4/ |
| H A D | mmp.rst | 7 filesystem against multiple hosts trying to use the filesystem
8 simultaneously. When a filesystem is opened (for mounting, or fsck,
15 filesystem is active on another machine and the open fails. If the MMP
19 While the filesystem is live, the kernel sets up a timer to re-check the
23 filesystem, and node A remounts the filesystem read-only. If the
57 - Hostname of the node that opened the filesystem.
61 - Block device name of the filesystem.
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| H A D | orphan.rst | 7 are still alive because they are open. In case of crash the filesystem has to
17 inode (we overload i_dtime inode field for this). However this filesystem
20 (COMPAT_ORPHAN_FILE) is enabled, the filesystem has a special inode
36 When a filesystem with orphan file feature is writeably mounted, we set
39 filesystem, we read the whole orphan file and process all orphan inodes found
40 there as usual. When cleanly unmounting the filesystem we remove the
42 file and also make the filesystem fully compatible with older kernels.
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| /linux/fs/xfs/ |
| H A D | Kconfig | 3 tristate "XFS filesystem support"
9 XFS is a high performance journaling filesystem which originated
30 The V4 filesystem format lacks certain features that are supported
37 Administrators and users can detect a V4 filesystem by running
38 xfs_info against a filesystem mountpoint and checking for a string
40 filesystem is a V4 filesystem. If no such string is found, please
55 The ASCII case insensitivity filesystem feature only works correctly
64 Administrators and users can detect such a filesystem by running
65 xfs_info against a filesystem mountpoint and checking for a string
67 filesystem is a case-insensitive filesystem. If no such string is
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| /linux/fs/configfs/ |
| H A D | Kconfig | 3 tristate "Userspace-driven configuration filesystem"
5 configfs is a RAM-based filesystem that provides the converse
6 of sysfs's functionality. Where sysfs is a filesystem-based
7 view of kernel objects, configfs is a filesystem-based manager
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| /linux/Documentation/admin-guide/LSM/ |
| H A D | LoadPin.rst | 6 (modules, firmware, etc) all originate from the same filesystem, with
7 the expectation that such a filesystem is backed by a read-only device
9 and/or unchangeable filesystem to enforce module and firmware loading
18 block device backing the filesystem is not read-only, a sysctl is
20 a mutable filesystem means pinning is mutable too, but having the
21 sysctl allows for easy testing on systems with a mutable filesystem.)
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| /linux/fs/overlayfs/ |
| H A D | Kconfig | 3 tristate "Overlay filesystem support"
7 An overlay filesystem combines two filesystems - an 'upper' filesystem
8 and a 'lower' filesystem. When a name exists in both filesystems, the
9 object in the 'upper' filesystem is visible while the object in the
10 'lower' filesystem is either hidden or, in the case of directories,
22 "redirect_dir=off" module option or on a filesystem instance basis
53 "index=off" module option or on a filesystem instance basis with the
74 globally with the "nfs_export=off" module option or on a filesystem
100 unused high bits in underlying filesystem inode numbers to map all
120 module option or on a filesystem instance basis with the
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| /linux/Documentation/admin-guide/ |
| H A D | xfs.rst | 7 XFS is a high performance journaling filesystem which originated
22 When mounting an XFS filesystem, the following options are accepted.
39 device reclaim space freed by the filesystem. This is
59 across the entire filesystem rather than just on directories
68 to create inodes at any location in the filesystem,
86 If ``largeio`` is specified, a filesystem that was created with a
88 in ``st_blksize``. If the filesystem does not have a ``swidth``
127 An XFS filesystem has up to three parts: a data section, a log
158 The filesystem will be mounted without running log recovery.
159 If the filesystem was not cleanly unmounted, it is likely to
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| /linux/Documentation/filesystems/iomap/ |
| H A D | design.rst | 20 iomap is a filesystem library for handling common file operations.
25 from the filesystem, but the storage information is not necessarily
52 The target audience for this document are filesystem, storage, and
63 the basis of that unit, the iomap model asks the filesystem for the
66 This strategy improves the filesystem's visibility into the size of the
70 of mapping function calls into the filesystem across a larger amount of
130 * **filesystem mapping lock**: This synchronization primitive is
131 internal to the filesystem and must protect the file mapping data
133 The filesystem author must determine how this coordination should
145 This implies that the filesystem must have already allocated space
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| H A D | porting.rst | 20 There are several reasons to convert a filesystem to iomap:
24 into the filesystem to return a mapping for only that page.
37 4. Lower maintenance overhead for individual filesystem maintainers.
42 filesystem using iomap.
48 ``select FS_IOMAP`` to your filesystem's Kconfig option.
50 variety of your filesystem's supported configurations to build a
64 Next, modify the filesystem's ``get_block(create = false)``
96 w/ DIO enabled in earnest on filesystem.
101 This will get the entire filesystem using the new mapping functions, and
118 for every filesystem.
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| /linux/Documentation/driver-api/firmware/ |
| H A D | direct-fs-lookup.rst | 2 Direct filesystem lookup
5 Direct filesystem lookup is the most common form of firmware lookup performed
7 filesystem in the paths documented in the section 'Firmware search paths'.
8 The filesystem lookup is implemented in fw_get_filesystem_firmware(), it
12 It is recommended you keep /lib/firmware paths on your root filesystem,
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| /linux/fs/gfs2/ |
| H A D | Kconfig | 10 A cluster filesystem.
14 and writes to the block device like a local filesystem, but also uses
16 filesystem consistency is maintained. One of the nifty features of
17 GFS is perfect consistency -- changes made to the filesystem on one
20 To use the GFS2 filesystem in a cluster, you will need to enable
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| /linux/Documentation/userspace-api/ |
| H A D | lsm.rst | 19 The proc filesystem provides this value in ``/proc/self/attr/current``.
26 The proc filesystem provides this value in ``/proc/self/attr/exec``.
32 The proc filesystem provides this value in ``/proc/self/attr/fscreate``.
37 The proc filesystem provides this value in ``/proc/self/attr/keycreate``.
42 The proc filesystem provides this value in ``/proc/self/attr/prev``.
48 The proc filesystem provides this value in ``/proc/self/attr/sockcreate``.
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| /linux/Documentation/filesystems/caching/ |
| H A D | netfs-api.rst | 7 Fscache provides an API by which a network filesystem can make use of local
45 The fscache hierarchy is organised on two levels from a network filesystem's
50 A network filesystem acquires a volume cookie for a volume using a volume key,
58 A filesystem would typically have a volume cookie for each superblock.
60 The filesystem then acquires a cookie for each file within that volume using an
65 filesystem.
67 A filesystem would typically have a cookie for each inode, and would acquire it
70 Once it has a cookie, the filesystem needs to mark the cookie as being in use.
75 A filesystem would typically "use" the cookie in its file open routine and
81 When performing a read, write or resize on a cookie, the filesystem must first
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