sphinx.addnodesdocument)}( rawsourcechildren]( translations LanguagesNode)}(hhh](h pending_xref)}(hhh]docutils.nodesTextChinese (Simplified)}parenthsba attributes}(ids]classes]names]dupnames]backrefs] refdomainstdreftypedoc reftarget//translations/zh_CN/filesystems/caching/fscachemodnameN classnameN refexplicitutagnamehhh ubh)}(hhh]hChinese (Traditional)}hh2sbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget//translations/zh_TW/filesystems/caching/fscachemodnameN classnameN refexplicituh1hhh ubh)}(hhh]hItalian}hhFsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget//translations/it_IT/filesystems/caching/fscachemodnameN classnameN refexplicituh1hhh ubh)}(hhh]hJapanese}hhZsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget//translations/ja_JP/filesystems/caching/fscachemodnameN classnameN refexplicituh1hhh ubh)}(hhh]hKorean}hhnsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget//translations/ko_KR/filesystems/caching/fscachemodnameN classnameN refexplicituh1hhh ubh)}(hhh]hSpanish}hhsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget//translations/sp_SP/filesystems/caching/fscachemodnameN classnameN refexplicituh1hhh ubeh}(h]h ]h"]h$]h&]current_languageEnglishuh1h hh _documenthsourceNlineNubhcomment)}(h SPDX-License-Identifier: GPL-2.0h]h SPDX-License-Identifier: GPL-2.0}hhsbah}(h]h ]h"]h$]h&] xml:spacepreserveuh1hhhhhhI/var/lib/git/docbuild/linux/Documentation/filesystems/caching/fscache.rsthKubhsection)}(hhh](htitle)}(hGeneral Filesystem Cachingh]hGeneral Filesystem Caching}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhhhhhKubh)}(hhh](h)}(hOverviewh]hOverview}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhhhhhKubh paragraph)}(hThis facility is a general purpose cache for network filesystems, though it could be used for caching other things such as ISO9660 filesystems too.h]hThis facility is a general purpose cache for network filesystems, though it could be used for caching other things such as ISO9660 filesystems too.}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK hhhhubh)}(hWFS-Cache mediates between cache backends (such as CacheFiles) and network filesystems::h]hVFS-Cache mediates between cache backends (such as CacheFiles) and network filesystems:}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK hhhhubh literal_block)}(hXu+---------+ | | +--------------+ | NFS |--+ | | | | | +-->| CacheFS | +---------+ | +----------+ | | /dev/hda5 | | | | | +--------------+ +---------+ +-------------->| | | | | +-------+ | |--+ | AFS |----->| | | FS-Cache | | | | netfs |-->| |--+ +---------+ +-->| lib | | | | | | | | | | +--------------+ +---------+ | +-------+ +----------+ | | | | | | +-->| CacheFiles | | 9P |--+ | /var/cache | | | +--------------+ +---------+h]hXu+---------+ | | +--------------+ | NFS |--+ | | | | | +-->| CacheFS | +---------+ | +----------+ | | /dev/hda5 | | | | | +--------------+ +---------+ +-------------->| | | | | +-------+ | |--+ | AFS |----->| | | FS-Cache | | | | netfs |-->| |--+ +---------+ +-->| lib | | | | | | | | | | +--------------+ +---------+ | +-------+ +----------+ | | | | | | +-->| CacheFiles | | 9P |--+ | /var/cache | | | +--------------+ +---------+}hhsbah}(h]h ]h"]h$]h&]hhuh1hhhhKhhhhubh)}(hOr to look at it another way, FS-Cache is a module that provides a caching facility to a network filesystem such that the cache is transparent to the user::h]hOr to look at it another way, FS-Cache is a module that provides a caching facility to a network filesystem such that the cache is transparent to the user:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK"hhhhubh)}(hX+---------+ | | | Server | | | +---------+ | NETWORK ~~~~~|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | +----------+ V | | +---------+ | | | | | | | NFS |----->| FS-Cache | | | | |--+ +---------+ | | | +--------------+ +--------------+ | | | | | | | | V +----------+ +-->| CacheFiles |-->| Ext3 | +---------+ | /var/cache | | /dev/sda6 | | | +--------------+ +--------------+ | VFS | ^ ^ | | | | +---------+ +--------------+ | | KERNEL SPACE | | ~~~~~|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|~~~~~~|~~~~ | USER SPACE | | V | | +---------+ +--------------+ | | | | | Process | | cachefilesd | | | | | +---------+ +--------------+h]hX+---------+ | | | Server | | | +---------+ | NETWORK ~~~~~|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | +----------+ V | | +---------+ | | | | | | | NFS |----->| FS-Cache | | | | |--+ +---------+ | | | +--------------+ +--------------+ | | | | | | | | V +----------+ +-->| CacheFiles |-->| Ext3 | +---------+ | /var/cache | | /dev/sda6 | | | +--------------+ +--------------+ | VFS | ^ ^ | | | | +---------+ +--------------+ | | KERNEL SPACE | | ~~~~~|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|~~~~~~|~~~~ | USER SPACE | | V | | +---------+ +--------------+ | | | | | Process | | cachefilesd | | | | | +---------+ +--------------+}hjsbah}(h]h ]h"]h$]h&]hhuh1hhhhK&hhhhubh)}(hFS-Cache does not follow the idea of completely loading every netfs file opened in its entirety into a cache before permitting it to be accessed and then serving the pages out of that cache rather than the netfs inode because:h]hFS-Cache does not follow the idea of completely loading every netfs file opened in its entirety into a cache before permitting it to be accessed and then serving the pages out of that cache rather than the netfs inode because:}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKGhhhhubh block_quote)}(hX(1) It must be practical to operate without a cache. (2) The size of any accessible file must not be limited to the size of the cache. (3) The combined size of all opened files (this includes mapped libraries) must not be limited to the size of the cache. (4) The user should not be forced to download an entire file just to do a one-off access of a small portion of it (such as might be done with the "file" program). h]henumerated_list)}(hhh](h list_item)}(h1It must be practical to operate without a cache. h]h)}(h0It must be practical to operate without a cache.h]h0It must be practical to operate without a cache.}(hjChhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKKhj?ubah}(h]h ]h"]h$]h&]uh1j=hj:ubj>)}(hNThe size of any accessible file must not be limited to the size of the cache. h]h)}(hMThe size of any accessible file must not be limited to the size of the cache.h]hMThe size of any accessible file must not be limited to the size of the cache.}(hj[hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKMhjWubah}(h]h ]h"]h$]h&]uh1j=hj:ubj>)}(huThe combined size of all opened files (this includes mapped libraries) must not be limited to the size of the cache. h]h)}(htThe combined size of all opened files (this includes mapped libraries) must not be limited to the size of the cache.h]htThe combined size of all opened files (this includes mapped libraries) must not be limited to the size of the cache.}(hjshhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKPhjoubah}(h]h ]h"]h$]h&]uh1j=hj:ubj>)}(hThe user should not be forced to download an entire file just to do a one-off access of a small portion of it (such as might be done with the "file" program). h]h)}(hThe user should not be forced to download an entire file just to do a one-off access of a small portion of it (such as might be done with the "file" program).h]hThe user should not be forced to download an entire file just to do a one-off access of a small portion of it (such as might be done with the “file” program).}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKShjubah}(h]h ]h"]h$]h&]uh1j=hj:ubeh}(h]h ]h"]h$]h&]enumtypearabicprefix(suffix)uh1j8hj4ubah}(h]h ]h"]h$]h&]uh1j2hhhKKhhhhubh)}(hVIt instead serves the cache out in chunks as and when requested by the netfs using it.h]hVIt instead serves the cache out in chunks as and when requested by the netfs using it.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKWhhhhubh)}(h+FS-Cache provides the following facilities:h]h+FS-Cache provides the following facilities:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK[hhhhubj3)}(hX * More than one cache can be used at once. Caches can be selected explicitly by use of tags. * Caches can be added / removed at any time, even whilst being accessed. * The netfs is provided with an interface that allows either party to withdraw caching facilities from a file (required for (2)). * The interface to the netfs returns as few errors as possible, preferring rather to let the netfs remain oblivious. * There are three types of cookie: cache, volume and data file cookies. Cache cookies represent the cache as a whole and are not normally visible to the netfs; the netfs gets a volume cookie to represent a collection of files (typically something that a netfs would get for a superblock); and data file cookies are used to cache data (something that would be got for an inode). * Volumes are matched using a key. This is a printable string that is used to encode all the information that might be needed to distinguish one superblock, say, from another. This would be a compound of things like cell name or server address, volume name or share path. It must be a valid pathname. * Cookies are matched using a key. This is a binary blob and is used to represent the object within a volume (so the volume key need not form part of the blob). This might include things like an inode number and uniquifier or a file handle. * Cookie resources are set up and pinned by marking the cookie in-use. This prevents the backing resources from being culled. Timed garbage collection is employed to eliminate cookies that haven't been used for a short while, thereby reducing resource overload. This is intended to be used when a file is opened or closed. A cookie can be marked in-use multiple times simultaneously; each mark must be unused. * Begin/end access functions are provided to delay cache withdrawal for the duration of an operation and prevent structs from being freed whilst we're looking at them. * Data I/O is done by asynchronous DIO to/from a buffer described by the netfs using an iov_iter. * An invalidation facility is available to discard data from the cache and to deal with I/O that's in progress that is accessing old data. * Cookies can be "retired" upon release, thereby causing the object to be removed from the cache. h]h bullet_list)}(hhh](j>)}(h\More than one cache can be used at once. Caches can be selected explicitly by use of tags. h]h)}(h[More than one cache can be used at once. Caches can be selected explicitly by use of tags.h]h[More than one cache can be used at once. Caches can be selected explicitly by use of tags.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK]hjubah}(h]h ]h"]h$]h&]uh1j=hjubj>)}(hGCaches can be added / removed at any time, even whilst being accessed. h]h)}(hFCaches can be added / removed at any time, even whilst being accessed.h]hFCaches can be added / removed at any time, even whilst being accessed.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK`hjubah}(h]h ]h"]h$]h&]uh1j=hjubj>)}(hThe netfs is provided with an interface that allows either party to withdraw caching facilities from a file (required for (2)). h]h)}(hThe netfs is provided with an interface that allows either party to withdraw caching facilities from a file (required for (2)).h]hThe netfs is provided with an interface that allows either party to withdraw caching facilities from a file (required for (2)).}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKbhjubah}(h]h ]h"]h$]h&]uh1j=hjubj>)}(hsThe interface to the netfs returns as few errors as possible, preferring rather to let the netfs remain oblivious. h]h)}(hrThe interface to the netfs returns as few errors as possible, preferring rather to let the netfs remain oblivious.h]hrThe interface to the netfs returns as few errors as possible, preferring rather to let the netfs remain oblivious.}(hj"hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKehjubah}(h]h ]h"]h$]h&]uh1j=hjubj>)}(hXxThere are three types of cookie: cache, volume and data file cookies. Cache cookies represent the cache as a whole and are not normally visible to the netfs; the netfs gets a volume cookie to represent a collection of files (typically something that a netfs would get for a superblock); and data file cookies are used to cache data (something that would be got for an inode). h]h)}(hXwThere are three types of cookie: cache, volume and data file cookies. Cache cookies represent the cache as a whole and are not normally visible to the netfs; the netfs gets a volume cookie to represent a collection of files (typically something that a netfs would get for a superblock); and data file cookies are used to cache data (something that would be got for an inode).h]hXwThere are three types of cookie: cache, volume and data file cookies. Cache cookies represent the cache as a whole and are not normally visible to the netfs; the netfs gets a volume cookie to represent a collection of files (typically something that a netfs would get for a superblock); and data file cookies are used to cache data (something that would be got for an inode).}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhhj6ubah}(h]h ]h"]h$]h&]uh1j=hjubj>)}(hX.Volumes are matched using a key. This is a printable string that is used to encode all the information that might be needed to distinguish one superblock, say, from another. This would be a compound of things like cell name or server address, volume name or share path. It must be a valid pathname. h]h)}(hX-Volumes are matched using a key. This is a printable string that is used to encode all the information that might be needed to distinguish one superblock, say, from another. This would be a compound of things like cell name or server address, volume name or share path. It must be a valid pathname.h]hX-Volumes are matched using a key. This is a printable string that is used to encode all the information that might be needed to distinguish one superblock, say, from another. This would be a compound of things like cell name or server address, volume name or share path. It must be a valid pathname.}(hjRhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKohjNubah}(h]h ]h"]h$]h&]uh1j=hjubj>)}(hCookies are matched using a key. This is a binary blob and is used to represent the object within a volume (so the volume key need not form part of the blob). This might include things like an inode number and uniquifier or a file handle. h]h)}(hCookies are matched using a key. This is a binary blob and is used to represent the object within a volume (so the volume key need not form part of the blob). This might include things like an inode number and uniquifier or a file handle.h]hCookies are matched using a key. This is a binary blob and is used to represent the object within a volume (so the volume key need not form part of the blob). This might include things like an inode number and uniquifier or a file handle.}(hjjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKuhjfubah}(h]h ]h"]h$]h&]uh1j=hjubj>)}(hXCookie resources are set up and pinned by marking the cookie in-use. This prevents the backing resources from being culled. Timed garbage collection is employed to eliminate cookies that haven't been used for a short while, thereby reducing resource overload. This is intended to be used when a file is opened or closed. A cookie can be marked in-use multiple times simultaneously; each mark must be unused. h](h)}(hXBCookie resources are set up and pinned by marking the cookie in-use. This prevents the backing resources from being culled. Timed garbage collection is employed to eliminate cookies that haven't been used for a short while, thereby reducing resource overload. This is intended to be used when a file is opened or closed.h]hXDCookie resources are set up and pinned by marking the cookie in-use. This prevents the backing resources from being culled. Timed garbage collection is employed to eliminate cookies that haven’t been used for a short while, thereby reducing resource overload. This is intended to be used when a file is opened or closed.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKzhj~ubh)}(hVA cookie can be marked in-use multiple times simultaneously; each mark must be unused.h]hVA cookie can be marked in-use multiple times simultaneously; each mark must be unused.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhj~ubeh}(h]h ]h"]h$]h&]uh1j=hjubj>)}(hBegin/end access functions are provided to delay cache withdrawal for the duration of an operation and prevent structs from being freed whilst we're looking at them. h]h)}(hBegin/end access functions are provided to delay cache withdrawal for the duration of an operation and prevent structs from being freed whilst we're looking at them.h]hBegin/end access functions are provided to delay cache withdrawal for the duration of an operation and prevent structs from being freed whilst we’re looking at them.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1j=hjubj>)}(h`Data I/O is done by asynchronous DIO to/from a buffer described by the netfs using an iov_iter. h]h)}(h_Data I/O is done by asynchronous DIO to/from a buffer described by the netfs using an iov_iter.h]h_Data I/O is done by asynchronous DIO to/from a buffer described by the netfs using an iov_iter.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1j=hjubj>)}(hAn invalidation facility is available to discard data from the cache and to deal with I/O that's in progress that is accessing old data. h]h)}(hAn invalidation facility is available to discard data from the cache and to deal with I/O that's in progress that is accessing old data.h]hAn invalidation facility is available to discard data from the cache and to deal with I/O that’s in progress that is accessing old data.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1j=hjubj>)}(haCookies can be "retired" upon release, thereby causing the object to be removed from the cache. h]h)}(h_Cookies can be "retired" upon release, thereby causing the object to be removed from the cache.h]hcCookies can be “retired” upon release, thereby causing the object to be removed from the cache.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1j=hjubeh}(h]h ]h"]h$]h&]bullet*uh1jhhhK]hjubah}(h]h ]h"]h$]h&]uh1j2hhhK]hhhhubh)}(h*The netfs API to FS-Cache can be found in:h]h*The netfs API to FS-Cache can be found in:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhhhhubj3)}(h0Documentation/filesystems/caching/netfs-api.rst h]h)}(h/Documentation/filesystems/caching/netfs-api.rsth]h/Documentation/filesystems/caching/netfs-api.rst}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhj ubah}(h]h ]h"]h$]h&]uh1j2hhhKhhhhubh)}(h2The cache backend API to FS-Cache can be found in:h]h2The cache backend API to FS-Cache can be found in:}(hj8hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhhhhubj3)}(h3Documentation/filesystems/caching/backend-api.rst h]h)}(h1Documentation/filesystems/caching/backend-api.rsth]h1Documentation/filesystems/caching/backend-api.rst}(hjJhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjFubah}(h]h ]h"]h$]h&]uh1j2hhhKhhhhubeh}(h]overviewah ]h"]overviewah$]h&]uh1hhhhhhhhKubh)}(hhh](h)}(hStatistical Informationh]hStatistical Information}(hjihhhNhNubah}(h]h ]h"]h$]h&]uh1hhjfhhhhhKubh)}(h hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhj; ubah}(h]h ]h"]h$]h&]uh1jhj8 ubj)}(hhh]h)}(hStateh]hState}(hjU hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjR ubah}(h]h ]h"]h$]h&]uh1jhj8 ubeh}(h]h ]h"]h$]h&]uh1jhj" ubj)}(hhh](j)}(hhh]h)}(hNAMEh]hNAME}(hju hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjr ubah}(h]h ]h"]h$]h&]uh1jhjo ubj)}(hhh]h)}(hName of the cache.h]hName of the cache.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhj ubah}(h]h ]h"]h$]h&]uh1jhjo ubeh}(h]h ]h"]h$]h&]uh1jhj" ubeh}(h]h ]h"]h$]h&]uh1jNhj ubeh}(h]h ]h"]h$]h&]colsKuh1jhj ubah}(h]h ]h"]h$]h&]uh1jhj ubah}(h]h ]h"]h$]h&]uh1j2hhhKhjc hhubh)}(hOThe state can be (-) Inactive, (P)reparing, (A)ctive, (E)rror or (W)ithdrawing.h]hOThe state can be (-) Inactive, (P)reparing, (A)ctive, (E)rror or (W)ithdrawing.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjc hhubeh}(h] cache-listah ]h"] cache listah$]h&]uh1hhhhhhhhKubh)}(hhh](h)}(h Volume Listh]h Volume List}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj hhhhhKubh)}(h+FS-Cache provides a list of volume cookies:h]h+FS-Cache provides a list of volume cookies:}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj hhubj3)}(h/proc/fs/fscache/volumes h]h)}(h/proc/fs/fscache/volumesh]h/proc/fs/fscache/volumes}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj ubah}(h]h ]h"]h$]h&]uh1j2hhhMhj hhubh)}(hThis will look something like::h]hThis will look something like:}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj hhubh)}(hVOLUME REF nCOOK ACC FL CACHE KEY ======== ===== ===== === == =============== ================ 00000001 55 54 1 00 default afs,example.com,100058h]hVOLUME REF nCOOK ACC FL CACHE KEY ======== ===== ===== === == =============== ================ 00000001 55 54 1 00 default afs,example.com,100058}hj sbah}(h]h ]h"]h$]h&]hhuh1hhhhMhj hhubh)}(hwhere the columns are:h]hwhere the columns are:}(hj( hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj hhubj3)}(hX======= =============================================================== COLUMN DESCRIPTION ======= =============================================================== VOLUME The volume cookie debug ID (also appears in traces) REF Number of references on the volume cookie nCOOK Number of cookies in the volume ACC Number of accesses pinning the cache FL Flags on the volume cookie CACHE Name of the cache or "-" KEY The indexing key for the volume ======= =============================================================== h]j)}(hhh]j)}(hhh](j)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jhj= ubj)}(hhh]h}(h]h ]h"]h$]h&]colwidthK?uh1jhj= ubj)}(hhh]j)}(hhh](j)}(hhh]h)}(hCOLUMNh]hCOLUMN}(hj] hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjZ ubah}(h]h ]h"]h$]h&]uh1jhjW ubj)}(hhh]h)}(h DESCRIPTIONh]h DESCRIPTION}(hjt hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hjq ubah}(h]h ]h"]h$]h&]uh1jhjW ubeh}(h]h ]h"]h$]h&]uh1jhjT ubah}(h]h ]h"]h$]h&]uh1jhj= ubjO)}(hhh](j)}(hhh](j)}(hhh]h)}(hVOLUMEh]hVOLUME}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj ubah}(h]h ]h"]h$]h&]uh1jhj ubj)}(hhh]h)}(h3The volume cookie debug ID (also appears in traces)h]h3The volume cookie debug ID (also appears in traces)}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj ubah}(h]h ]h"]h$]h&]uh1jhj ubeh}(h]h ]h"]h$]h&]uh1jhj ubj)}(hhh](j)}(hhh]h)}(hREFh]hREF}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj ubah}(h]h ]h"]h$]h&]uh1jhj ubj)}(hhh]h)}(h)Number of references on the volume cookieh]h)Number of references on the volume cookie}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj ubah}(h]h ]h"]h$]h&]uh1jhj ubeh}(h]h ]h"]h$]h&]uh1jhj ubj)}(hhh](j)}(hhh]h)}(hnCOOKh]hnCOOK}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hNumber of cookies in the volumeh]hNumber of cookies in the volume}(hj"hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhj ubj)}(hhh](j)}(hhh]h)}(hACCh]hACC}(hjBhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj?ubah}(h]h ]h"]h$]h&]uh1jhj<ubj)}(hhh]h)}(h$Number of accesses pinning the cacheh]h$Number of accesses pinning the cache}(hjYhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjVubah}(h]h ]h"]h$]h&]uh1jhj<ubeh}(h]h ]h"]h$]h&]uh1jhj ubj)}(hhh](j)}(hhh]h)}(hFLh]hFL}(hjyhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjvubah}(h]h ]h"]h$]h&]uh1jhjsubj)}(hhh]h)}(hFlags on the volume cookieh]hFlags on the volume cookie}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jhjsubeh}(h]h ]h"]h$]h&]uh1jhj ubj)}(hhh](j)}(hhh]h)}(hCACHEh]hCACHE}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hName of the cache or "-"h]hName of the cache or “-”}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhj ubj)}(hhh](j)}(hhh]h)}(hKEYh]hKEY}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hThe indexing key for the volumeh]hThe indexing key for the volume}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhj ubeh}(h]h ]h"]h$]h&]uh1jNhj= ubeh}(h]h ]h"]h$]h&]colsKuh1jhj: ubah}(h]h ]h"]h$]h&]uh1jhj6 ubah}(h]h ]h"]h$]h&]uh1j2hhhM hj hhubeh}(h] volume-listah ]h"] volume listah$]h&]uh1hhhhhhhhKubh)}(hhh](h)}(h Cookie Listh]h Cookie List}(hj<hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj9hhhhhMubh)}(h$FS-Cache provides a list of cookies:h]h$FS-Cache provides a list of cookies:}(hjJhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhj9hhubj3)}(h/proc/fs/fscache/cookies h]h)}(h/proc/fs/fscache/cookiesh]h/proc/fs/fscache/cookies}(hj\hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMhjXubah}(h]h ]h"]h$]h&]uh1j2hhhMhj9hhubh)}(hThis will look something like::h]hThis will look something like:}(hjphhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM hj9hhubh)}(hX*# head /proc/fs/fscache/cookies COOKIE VOLUME REF ACT ACC S FL DEF ======== ======== === === === = == ================ 00000435 00000001 1 0 -1 - 08 0000000201d080070000000000000000, 0000000000000000 00000436 00000001 1 0 -1 - 00 0000005601d080080000000000000000, 0000000000000051 00000437 00000001 1 0 -1 - 08 00023b3001d0823f0000000000000000, 0000000000000000 00000438 00000001 1 0 -1 - 08 0000005801d0807b0000000000000000, 0000000000000000 00000439 00000001 1 0 -1 - 08 00023b3201d080a10000000000000000, 0000000000000000 0000043a 00000001 1 0 -1 - 08 00023b3401d080a30000000000000000, 0000000000000000 0000043b 00000001 1 0 -1 - 08 00023b3601d080b30000000000000000, 0000000000000000 0000043c 00000001 1 0 -1 - 08 00023b3801d080b40000000000000000, 0000000000000000h]hX*# head /proc/fs/fscache/cookies COOKIE VOLUME REF ACT ACC S FL DEF ======== ======== === === === = == ================ 00000435 00000001 1 0 -1 - 08 0000000201d080070000000000000000, 0000000000000000 00000436 00000001 1 0 -1 - 00 0000005601d080080000000000000000, 0000000000000051 00000437 00000001 1 0 -1 - 08 00023b3001d0823f0000000000000000, 0000000000000000 00000438 00000001 1 0 -1 - 08 0000005801d0807b0000000000000000, 0000000000000000 00000439 00000001 1 0 -1 - 08 00023b3201d080a10000000000000000, 0000000000000000 0000043a 00000001 1 0 -1 - 08 00023b3401d080a30000000000000000, 0000000000000000 0000043b 00000001 1 0 -1 - 08 00023b3601d080b30000000000000000, 0000000000000000 0000043c 00000001 1 0 -1 - 08 00023b3801d080b40000000000000000, 0000000000000000}hj~sbah}(h]h ]h"]h$]h&]hhuh1hhhhM"hj9hhubh)}(hwhere the columns are:h]hwhere the columns are:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM.hj9hhubj3)}(hX6======= =============================================================== COLUMN DESCRIPTION ======= =============================================================== COOKIE The cookie debug ID (also appears in traces) VOLUME The parent volume cookie debug ID REF Number of references on the volume cookie ACT Number of times the cookie is marked for in use ACC Number of access pins in the cookie S State of the cookie FL Flags on the cookie DEF Key, auxiliary data ======= =============================================================== h]j)}(hhh]j)}(hhh](j)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jhjubj)}(hhh]h}(h]h ]h"]h$]h&]colwidthK?uh1jhjubj)}(hhh]j)}(hhh](j)}(hhh]h)}(hCOLUMNh]hCOLUMN}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM1hjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(h DESCRIPTIONh]h DESCRIPTION}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM1hjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubah}(h]h ]h"]h$]h&]uh1jhjubjO)}(hhh](j)}(hhh](j)}(hhh]h)}(hCOOKIEh]hCOOKIE}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM3hjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(h,The cookie debug ID (also appears in traces)h]h,The cookie debug ID (also appears in traces)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM3hjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(hVOLUMEh]hVOLUME}(hj8hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM4hj5ubah}(h]h ]h"]h$]h&]uh1jhj2ubj)}(hhh]h)}(h!The parent volume cookie debug IDh]h!The parent volume cookie debug ID}(hjOhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM4hjLubah}(h]h ]h"]h$]h&]uh1jhj2ubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(hREFh]hREF}(hjohhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM5hjlubah}(h]h ]h"]h$]h&]uh1jhjiubj)}(hhh]h)}(h)Number of references on the volume cookieh]h)Number of references on the volume cookie}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM5hjubah}(h]h ]h"]h$]h&]uh1jhjiubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(hACTh]hACT}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM6hjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(h/Number of times the cookie is marked for in useh]h/Number of times the cookie is marked for in use}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM6hjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(hACCh]hACC}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM7hjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(h#Number of access pins in the cookieh]h#Number of access pins in the cookie}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM7hjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(hj@ h]hS}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM8hjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hState of the cookieh]hState of the cookie}(hj*hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM8hj'ubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(hFLh]hFL}(hjJhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM9hjGubah}(h]h ]h"]h$]h&]uh1jhjDubj)}(hhh]h)}(hFlags on the cookieh]hFlags on the cookie}(hjahhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM9hj^ubah}(h]h ]h"]h$]h&]uh1jhjDubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(hDEFh]hDEF}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM:hj~ubah}(h]h ]h"]h$]h&]uh1jhj{ubj)}(hhh]h)}(hKey, auxiliary datah]hKey, auxiliary data}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhM:hjubah}(h]h ]h"]h$]h&]uh1jhj{ubeh}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jNhjubeh}(h]h ]h"]h$]h&]colsKuh1jhjubah}(h]h ]h"]h$]h&]uh1jhjubah}(h]h ]h"]h$]h&]uh1j2hhhM0hj9hhubeh}(h] cookie-listah ]h"] cookie listah$]h&]uh1hhhhhhhhMubh)}(hhh](h)}(h Debuggingh]h Debugging}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhM?ubh)}(hIf CONFIG_NETFS_DEBUG is enabled, the FS-Cache facility and NETFS support can have runtime debugging enabled by adjusting the value in::h]hIf CONFIG_NETFS_DEBUG is enabled, the FS-Cache facility and NETFS support can have runtime debugging enabled by adjusting the value in:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMAhjhhubh)}(h"/sys/module/netfs/parameters/debugh]h"/sys/module/netfs/parameters/debug}hjsbah}(h]h ]h"]h$]h&]hhuh1hhhhMDhjhhubh)}(h1This is a bitmask of debugging streams to enable:h]h1This is a bitmask of debugging streams to enable:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMFhjhhubj3)}(hX======= ======= =============================== ======================= BIT VALUE STREAM POINT ======= ======= =============================== ======================= 0 1 Cache management Function entry trace 1 2 Function exit trace 2 4 General 3 8 Cookie management Function entry trace 4 16 Function exit trace 5 32 General 6-8 (Not used) 9 512 I/O operation management Function entry trace 10 1024 Function exit trace 11 2048 General ======= ======= =============================== ======================= h]j)}(hhh]j)}(hhh](j)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jhjubj)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jhjubj)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jhjubj)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jhjubj)}(hhh]j)}(hhh](j)}(hhh]h)}(hBITh]hBIT}(hjIhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMIhjFubah}(h]h ]h"]h$]h&]uh1jhjCubj)}(hhh]h)}(hVALUEh]hVALUE}(hj`hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMIhj]ubah}(h]h ]h"]h$]h&]uh1jhjCubj)}(hhh]h)}(hSTREAMh]hSTREAM}(hjwhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMIhjtubah}(h]h ]h"]h$]h&]uh1jhjCubj)}(hhh]h)}(hPOINTh]hPOINT}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMIhjubah}(h]h ]h"]h$]h&]uh1jhjCubeh}(h]h ]h"]h$]h&]uh1jhj@ubah}(h]h ]h"]h$]h&]uh1jhjubjO)}(hhh](j)}(hhh](j)}(hhh]h)}(h0h]h0}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMKhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(h1h]h1}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMKhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hCache managementh]hCache management}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMKhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hFunction entry traceh]hFunction entry trace}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMKhjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(hjh]h1}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMLhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(h2h]h2}(hj2hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMLhj/ubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hFunction exit traceh]hFunction exit trace}(hjRhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMLhjOubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(hj4h]h2}(hjrhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMMhjoubah}(h]h ]h"]h$]h&]uh1jhjlubj)}(hhh]h)}(h4h]h4}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMMhjubah}(h]h ]h"]h$]h&]uh1jhjlubj)}(hhh]h}(h]h ]h"]h$]h&]uh1jhjlubj)}(hhh]h)}(hGeneralh]hGeneral}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMMhjubah}(h]h ]h"]h$]h&]uh1jhjlubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(h3h]h3}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMNhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(h8h]h8}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMNhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hCookie managementh]hCookie management}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMNhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hFunction entry traceh]hFunction entry trace}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMNhj ubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(hjh]h4}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMOhj*ubah}(h]h ]h"]h$]h&]uh1jhj'ubj)}(hhh]h)}(h16h]h16}(hjChhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMOhj@ubah}(h]h ]h"]h$]h&]uh1jhj'ubj)}(hhh]h}(h]h ]h"]h$]h&]uh1jhj'ubj)}(hhh]h)}(hFunction exit traceh]hFunction exit trace}(hjchhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMOhj`ubah}(h]h ]h"]h$]h&]uh1jhj'ubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(h5h]h5}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMPhjubah}(h]h ]h"]h$]h&]uh1jhj}ubj)}(hhh]h)}(h32h]h32}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMPhjubah}(h]h ]h"]h$]h&]uh1jhj}ubj)}(hhh]h}(h]h ]h"]h$]h&]uh1jhj}ubj)}(hhh]h)}(hGeneralh]hGeneral}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMPhjubah}(h]h ]h"]h$]h&]uh1jhj}ubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(h6-8h]h6-8}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMQhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(h (Not used)h]h (Not used)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMQhjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(h9h]h9}(hj#hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMRhj ubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(h512h]h512}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMRhj7ubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hI/O operation managementh]hI/O operation management}(hjQhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMRhjNubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hFunction entry traceh]hFunction entry trace}(hjhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMRhjeubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(h10h]h10}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMShjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(h1024h]h1024}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMShjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hFunction exit traceh]hFunction exit trace}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMShjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh](j)}(hhh]h)}(h11h]h11}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMThjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(h2048h]h2048}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMThjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hGeneralh]hGeneral}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhMThjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jNhjubeh}(h]h ]h"]h$]h&]colsKuh1jhjubah}(h]h ]h"]h$]h&]uh1jhjubah}(h]h ]h"]h$]h&]uh1j2hhhMHhjhhubh)}(hpThe appropriate set of values should be OR'd together and the result written to the control file. For example::h]hqThe appropriate set of values should be OR’d together and the result written to the control file. 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