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authorAnton Altaparmakov <aia21@cantab.net>2005-03-10 11:06:19 +0000
committerAnton Altaparmakov <aia21@cantab.net>2005-05-05 11:26:01 +0100
commit905685f68fc72844b8c2689c39a5c6c35e840152 (patch)
tree0ff1d145a7771b24643c1b685ecbb3f791cda6fb /fs/ntfs/aops.c
parent43b01fda8b17b2b63e7dcdeed11c2ebba56b1fc9 (diff)
downloadlinux-linaro-905685f68fc72844b8c2689c39a5c6c35e840152.tar.gz
NTFS: - Modify ->readpage and ->writepage (fs/ntfs/aops.c) so they detect
and handle the case where an attribute is converted from resident to non-resident by a concurrent file write. - Reorder some operations when converting an attribute from resident to non-resident (fs/ntfs/attrib.c) so it is safe wrt concurrent ->readpage and ->writepage. Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
Diffstat (limited to 'fs/ntfs/aops.c')
-rw-r--r--fs/ntfs/aops.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
index 2a7cba258cc..6241c4cfbe2 100644
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -355,6 +355,7 @@ static int ntfs_readpage(struct file *file, struct page *page)
u32 attr_len;
int err = 0;
+retry_readpage:
BUG_ON(!PageLocked(page));
/*
* This can potentially happen because we clear PageUptodate() during
@@ -408,6 +409,14 @@ static int ntfs_readpage(struct file *file, struct page *page)
err = PTR_ERR(mrec);
goto err_out;
}
+ /*
+ * If a parallel write made the attribute non-resident, drop the mft
+ * record and retry the readpage.
+ */
+ if (unlikely(NInoNonResident(ni))) {
+ unmap_mft_record(base_ni);
+ goto retry_readpage;
+ }
ctx = ntfs_attr_get_search_ctx(base_ni, mrec);
if (unlikely(!ctx)) {
err = -ENOMEM;
@@ -1248,6 +1257,7 @@ static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
u32 attr_len;
int err;
+retry_writepage:
BUG_ON(!PageLocked(page));
i_size = i_size_read(vi);
/* Is the page fully outside i_size? (truncate in progress) */
@@ -1338,6 +1348,14 @@ static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
ctx = NULL;
goto err_out;
}
+ /*
+ * If a parallel write made the attribute non-resident, drop the mft
+ * record and retry the writepage.
+ */
+ if (unlikely(NInoNonResident(ni))) {
+ unmap_mft_record(base_ni);
+ goto retry_writepage;
+ }
ctx = ntfs_attr_get_search_ctx(base_ni, m);
if (unlikely(!ctx)) {
err = -ENOMEM;