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Diffstat (limited to 'Documentation/filesystems/porting.rst')
| -rw-r--r-- | Documentation/filesystems/porting.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/filesystems/porting.rst b/Documentation/filesystems/porting.rst index d33429294252..3397937ed838 100644 --- a/Documentation/filesystems/porting.rst +++ b/Documentation/filesystems/porting.rst @@ -1286,6 +1286,11 @@ The vm_area_desc provides the minimum required information for a filesystem to initialise state upon memory mapping of a file-backed region, and output parameters for the file system to set this state. +In nearly all cases, this is all that is required for a filesystem. However, if +a filesystem needs to perform an operation such a pre-population of page tables, +then that action can be specified in the vm_area_desc->action field, which can +be configured using the mmap_action_*() helpers. + --- **mandatory** @@ -1322,3 +1327,10 @@ When vfs_mkdir() returns an error, and so both dputs() the original dentry and doesn't provide a replacement, it also unlocks the parent. Consequently the return value from vfs_mkdir() can be passed to end_creating() and the parent will be unlocked precisely when necessary. + +--- + +**mandatory** + +kill_litter_super() is gone; convert to DCACHE_PERSISTENT use (as all +in-tree filesystems have done). |