diff options
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/bfs.txt | 2 | ||||
| -rw-r--r-- | Documentation/filesystems/nfs/pnfs.txt | 37 | ||||
| -rw-r--r-- | Documentation/filesystems/overlayfs.txt | 9 | ||||
| -rw-r--r-- | Documentation/filesystems/sysfs-pci.txt | 15 | ||||
| -rw-r--r-- | Documentation/filesystems/vfs.txt | 3 |
5 files changed, 22 insertions, 44 deletions
diff --git a/Documentation/filesystems/bfs.txt b/Documentation/filesystems/bfs.txt index 78043d5a8fc3..843ce91a2e40 100644 --- a/Documentation/filesystems/bfs.txt +++ b/Documentation/filesystems/bfs.txt @@ -54,4 +54,4 @@ The first 4 bytes should be 0x1badface. If you have any patches, questions or suggestions regarding this BFS implementation please contact the author: -Tigran Aivazian <tigran@aivazian.fsnet.co.uk> +Tigran Aivazian <aivazian.tigran@gmail.com> diff --git a/Documentation/filesystems/nfs/pnfs.txt b/Documentation/filesystems/nfs/pnfs.txt index 8de578a98222..80dc0bdc302a 100644 --- a/Documentation/filesystems/nfs/pnfs.txt +++ b/Documentation/filesystems/nfs/pnfs.txt @@ -64,46 +64,9 @@ table which are called by the nfs-client pnfs-core to implement the different layout types. Files-layout-driver code is in: fs/nfs/filelayout/.. directory -Objects-layout-driver code is in: fs/nfs/objlayout/.. directory Blocks-layout-driver code is in: fs/nfs/blocklayout/.. directory Flexfiles-layout-driver code is in: fs/nfs/flexfilelayout/.. directory -objects-layout setup --------------------- - -As part of the full STD implementation the objlayoutdriver.ko needs, at times, -to automatically login to yet undiscovered iscsi/osd devices. For this the -driver makes up-calles to a user-mode script called *osd_login* - -The path_name of the script to use is by default: - /sbin/osd_login. -This name can be overridden by the Kernel module parameter: - objlayoutdriver.osd_login_prog - -If Kernel does not find the osd_login_prog path it will zero it out -and will not attempt farther logins. An admin can then write new value -to the objlayoutdriver.osd_login_prog Kernel parameter to re-enable it. - -The /sbin/osd_login is part of the nfs-utils package, and should usually -be installed on distributions that support this Kernel version. - -The API to the login script is as follows: - Usage: $0 -u <URI> -o <OSDNAME> -s <SYSTEMID> - Options: - -u target uri e.g. iscsi://<ip>:<port> - (always exists) - (More protocols can be defined in the future. - The client does not interpret this string it is - passed unchanged as received from the Server) - -o osdname of the requested target OSD - (Might be empty) - (A string which denotes the OSD name, there is a - limit of 64 chars on this string) - -s systemid of the requested target OSD - (Might be empty) - (This string, if not empty is always an hex - representation of the 20 bytes osd_system_id) - blocks-layout setup ------------------- diff --git a/Documentation/filesystems/overlayfs.txt b/Documentation/filesystems/overlayfs.txt index 634d03e20c2d..c9e884b52698 100644 --- a/Documentation/filesystems/overlayfs.txt +++ b/Documentation/filesystems/overlayfs.txt @@ -21,12 +21,19 @@ from accessing the corresponding object from the original filesystem. This is most obvious from the 'st_dev' field returned by stat(2). While directories will report an st_dev from the overlay-filesystem, -all non-directory objects will report an st_dev from the lower or +non-directory objects may report an st_dev from the lower filesystem or upper filesystem that is providing the object. Similarly st_ino will only be unique when combined with st_dev, and both of these can change over the lifetime of a non-directory object. Many applications and tools ignore these values and will not be affected. +In the special case of all overlay layers on the same underlying +filesystem, all objects will report an st_dev from the overlay +filesystem and st_ino from the underlying filesystem. This will +make the overlay mount more compliant with filesystem scanners and +overlay objects will be distinguishable from the corresponding +objects in the original filesystem. + Upper and Lower --------------- diff --git a/Documentation/filesystems/sysfs-pci.txt b/Documentation/filesystems/sysfs-pci.txt index 6ea1ceda6f52..06f1d64c6f70 100644 --- a/Documentation/filesystems/sysfs-pci.txt +++ b/Documentation/filesystems/sysfs-pci.txt @@ -113,9 +113,18 @@ Supporting PCI access on new platforms -------------------------------------- In order to support PCI resource mapping as described above, Linux platform -code must define HAVE_PCI_MMAP and provide a pci_mmap_page_range function. -Platforms are free to only support subsets of the mmap functionality, but -useful return codes should be provided. +code should ideally define ARCH_GENERIC_PCI_MMAP_RESOURCE and use the generic +implementation of that functionality. To support the historical interface of +mmap() through files in /proc/bus/pci, platforms may also set HAVE_PCI_MMAP. + +Alternatively, platforms which set HAVE_PCI_MMAP may provide their own +implementation of pci_mmap_page_range() instead of defining +ARCH_GENERIC_PCI_MMAP_RESOURCE. + +Platforms which support write-combining maps of PCI resources must define +arch_can_pci_mmap_wc() which shall evaluate to non-zero at runtime when +write-combining is permitted. Platforms which support maps of I/O resources +define arch_can_pci_mmap_io() similarly. Legacy resources are protected by the HAVE_PCI_LEGACY define. Platforms wishing to support legacy functionality should define it and provide diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt index 94dd27ef4a76..f42b90687d40 100644 --- a/Documentation/filesystems/vfs.txt +++ b/Documentation/filesystems/vfs.txt @@ -694,8 +694,7 @@ struct address_space_operations { write_end: After a successful write_begin, and data copy, write_end must be called. len is the original len passed to write_begin, and copied - is the amount that was able to be copied (copied == len is always true - if write_begin was called with the AOP_FLAG_UNINTERRUPTIBLE flag). + is the amount that was able to be copied. The filesystem must take care of unlocking the page and releasing it refcount, and updating i_size. |
