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authorAnton Altaparmakov <aia21@cam.ac.uk>2007-10-12 09:37:15 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-12 09:16:30 -0700
commitbfab36e81611e60573b84eb4e4b4c8d8545b2320 (patch)
treeacd151a4c85459dcd2f6575ceb385090ebaaf984 /fs/ntfs/aops.c
parentf26e51f67ae6a75ffc57b96cf5fe096f75e778cb (diff)
downloadlinux-linaro-bfab36e81611e60573b84eb4e4b4c8d8545b2320.tar.gz
NTFS: Fix a mount time deadlock.
Big thanks go to Mathias Kolehmainen for reporting the bug, providing debug output and testing the patches I sent him to get it working. The fix was to stop calling ntfs_attr_set() at mount time as that causes balance_dirty_pages_ratelimited() to be called which on systems with little memory actually tries to go and balance the dirty pages which tries to take the s_umount semaphore but because we are still in fill_super() across which the VFS holds s_umount for writing this results in a deadlock. We now do the dirty work by hand by submitting individual buffers. This has the annoying "feature" that mounting can take a few seconds if the journal is large as we have clear it all. One day someone should improve on this by deferring the journal clearing to a helper kernel thread so it can be done in the background but I don't have time for this at the moment and the current solution works fine so I am leaving it like this for now. Signed-off-by: Anton Altaparmakov <aia21@cantab.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ntfs/aops.c')
-rw-r--r--fs/ntfs/aops.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
index 6e5c2534f4b..cfdc7900d27 100644
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -2,7 +2,7 @@
* aops.c - NTFS kernel address space operations and page cache handling.
* Part of the Linux-NTFS project.
*
- * Copyright (c) 2001-2006 Anton Altaparmakov
+ * Copyright (c) 2001-2007 Anton Altaparmakov
* Copyright (c) 2002 Richard Russon
*
* This program/include file is free software; you can redistribute it and/or
@@ -396,7 +396,7 @@ static int ntfs_readpage(struct file *file, struct page *page)
loff_t i_size;
struct inode *vi;
ntfs_inode *ni, *base_ni;
- u8 *kaddr;
+ u8 *addr;
ntfs_attr_search_ctx *ctx;
MFT_RECORD *mrec;
unsigned long flags;
@@ -491,15 +491,15 @@ retry_readpage:
/* Race with shrinking truncate. */
attr_len = i_size;
}
- kaddr = kmap_atomic(page, KM_USER0);
+ addr = kmap_atomic(page, KM_USER0);
/* Copy the data to the page. */
- memcpy(kaddr, (u8*)ctx->attr +
+ memcpy(addr, (u8*)ctx->attr +
le16_to_cpu(ctx->attr->data.resident.value_offset),
attr_len);
/* Zero the remainder of the page. */
- memset(kaddr + attr_len, 0, PAGE_CACHE_SIZE - attr_len);
+ memset(addr + attr_len, 0, PAGE_CACHE_SIZE - attr_len);
flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
+ kunmap_atomic(addr, KM_USER0);
put_unm_err_out:
ntfs_attr_put_search_ctx(ctx);
unm_err_out:
@@ -1344,7 +1344,7 @@ static int ntfs_writepage(struct page *page, struct writeback_control *wbc)
loff_t i_size;
struct inode *vi = page->mapping->host;
ntfs_inode *base_ni = NULL, *ni = NTFS_I(vi);
- char *kaddr;
+ char *addr;
ntfs_attr_search_ctx *ctx = NULL;
MFT_RECORD *m = NULL;
u32 attr_len;
@@ -1484,14 +1484,14 @@ retry_writepage:
/* Shrinking cannot fail. */
BUG_ON(err);
}
- kaddr = kmap_atomic(page, KM_USER0);
+ addr = kmap_atomic(page, KM_USER0);
/* Copy the data from the page to the mft record. */
memcpy((u8*)ctx->attr +
le16_to_cpu(ctx->attr->data.resident.value_offset),
- kaddr, attr_len);
+ addr, attr_len);
/* Zero out of bounds area in the page cache page. */
- memset(kaddr + attr_len, 0, PAGE_CACHE_SIZE - attr_len);
- kunmap_atomic(kaddr, KM_USER0);
+ memset(addr + attr_len, 0, PAGE_CACHE_SIZE - attr_len);
+ kunmap_atomic(addr, KM_USER0);
flush_dcache_page(page);
flush_dcache_mft_record_page(ctx->ntfs_ino);
/* We are done with the page. */