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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-16 01:39:15 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-16 01:39:15 +0200 |
| commit | eea3a00264cf243a28e4331566ce67b86059339d (patch) | |
| tree | 487f16389e0dfa32e9caa7604d1274a7dcda8f04 /Documentation/filesystems | |
| parent | Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cool... (diff) | |
| parent | parisc: remove use of seq_printf return value (diff) | |
| download | linux-eea3a00264cf243a28e4331566ce67b86059339d.tar.xz linux-eea3a00264cf243a28e4331566ce67b86059339d.zip | |
Merge branch 'akpm' (patches from Andrew)
Merge second patchbomb from Andrew Morton:
- the rest of MM
- various misc bits
- add ability to run /sbin/reboot at reboot time
- printk/vsprintf changes
- fiddle with seq_printf() return value
* akpm: (114 commits)
parisc: remove use of seq_printf return value
lru_cache: remove use of seq_printf return value
tracing: remove use of seq_printf return value
cgroup: remove use of seq_printf return value
proc: remove use of seq_printf return value
s390: remove use of seq_printf return value
cris fasttimer: remove use of seq_printf return value
cris: remove use of seq_printf return value
openrisc: remove use of seq_printf return value
ARM: plat-pxa: remove use of seq_printf return value
nios2: cpuinfo: remove use of seq_printf return value
microblaze: mb: remove use of seq_printf return value
ipc: remove use of seq_printf return value
rtc: remove use of seq_printf return value
power: wakeup: remove use of seq_printf return value
x86: mtrr: if: remove use of seq_printf return value
linux/bitmap.h: improve BITMAP_{LAST,FIRST}_WORD_MASK
MAINTAINERS: CREDITS: remove Stefano Brivio from B43
.mailmap: add Ricardo Ribalda
CREDITS: add Ricardo Ribalda Delgado
...
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/Locking | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking index c3cd6279e92e..7c3f187d48bf 100644 --- a/Documentation/filesystems/Locking +++ b/Documentation/filesystems/Locking @@ -523,6 +523,7 @@ prototypes: void (*close)(struct vm_area_struct*); int (*fault)(struct vm_area_struct*, struct vm_fault *); int (*page_mkwrite)(struct vm_area_struct *, struct vm_fault *); + int (*pfn_mkwrite)(struct vm_area_struct *, struct vm_fault *); int (*access)(struct vm_area_struct *, unsigned long, void*, int, int); locking rules: @@ -532,6 +533,7 @@ close: yes fault: yes can return with page locked map_pages: yes page_mkwrite: yes can return with page locked +pfn_mkwrite: yes access: yes ->fault() is called when a previously not present pte is about @@ -558,6 +560,12 @@ the page has been truncated, the filesystem should not look up a new page like the ->fault() handler, but simply return with VM_FAULT_NOPAGE, which will cause the VM to retry the fault. + ->pfn_mkwrite() is the same as page_mkwrite but when the pte is +VM_PFNMAP or VM_MIXEDMAP with a page-less entry. Expected return is +VM_FAULT_NOPAGE. Or one of the VM_FAULT_ERROR types. The default behavior +after this call is to make the pte read-write, unless pfn_mkwrite returns +an error. + ->access() is called when get_user_pages() fails in access_process_vm(), typically used to debug a process through /proc/pid/mem or ptrace. This function is needed only for |