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-rw-r--r--Documentation/filesystems/Locking9
1 files changed, 6 insertions, 3 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index 8a817f656f0a..b6426f15b4ae 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -173,12 +173,13 @@ prototypes:
sector_t (*bmap)(struct address_space *, sector_t);
int (*invalidatepage) (struct page *, unsigned long);
int (*releasepage) (struct page *, int);
+ void (*freepage)(struct page *);
int (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
loff_t offset, unsigned long nr_segs);
int (*launder_page) (struct page *);
locking rules:
- All except set_page_dirty may block
+ All except set_page_dirty and freepage may block
BKL PageLocked(page) i_mutex
writepage: no yes, unlocks (see below)
@@ -193,6 +194,7 @@ perform_write: no n/a yes
bmap: no
invalidatepage: no yes
releasepage: no yes
+freepage: no yes
direct_IO: no
launder_page: no yes
@@ -288,6 +290,9 @@ buffers from the page in preparation for freeing it. It returns zero to
indicate that the buffers are (or may be) freeable. If ->releasepage is zero,
the kernel assumes that the fs has no private interest in the buffers.
+ ->freepage() is called when the kernel is done dropping the page
+from the page cache.
+
->launder_page() may be called prior to releasing a page if
it is still found to be dirty. It returns zero if the page was successfully
cleaned, or an error value if not. Note that in order to prevent the page
@@ -322,7 +327,6 @@ fl_release_private: yes yes
prototypes:
int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
void (*fl_notify)(struct file_lock *); /* unblock callback */
- void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
void (*fl_release_private)(struct file_lock *);
void (*fl_break)(struct file_lock *); /* break_lease callback */
@@ -330,7 +334,6 @@ locking rules:
BKL may block
fl_compare_owner: yes no
fl_notify: yes no
-fl_copy_lock: yes no
fl_release_private: yes yes
fl_break: yes no