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authorAlessio Igor Bogani <abogani@texware.it>2010-11-16 18:40:47 +0100
committerJan Kara <jack@suse.cz>2011-01-06 17:03:56 +0100
commit4d0fb621d35007c19a396f2bb629e5aeaacef2d0 (patch)
tree92f6e0d3c38c15b0af507bd4b6d3353e34a337a9 /fs/udf/udf_i.h
parentd1668fe390c1e84580575965684a8fa7e4626dee (diff)
downloadlinux-stericsson-4d0fb621d35007c19a396f2bb629e5aeaacef2d0.tar.gz
udf: Replace bkl with the UDF_I(inode)->i_data_sem for protect udf_inode_info struct
Replace bkl with the UDF_I(inode)->i_data_sem rw semaphore in udf_release_file(), udf_symlink(), udf_symlink_filler(), udf_get_block(), udf_block_map(), and udf_setattr(). The rule now is that any operation on regular file's or symlink's extents (or generally allocation information including goal block) needs to hold i_data_sem. This work was supported by a hardware donation from the CE Linux Forum. Signed-off-by: Alessio Igor Bogani <abogani@texware.it> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/udf/udf_i.h')
-rw-r--r--fs/udf/udf_i.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/udf/udf_i.h b/fs/udf/udf_i.h
index e58d1de41073..d1bd31ea724e 100644
--- a/fs/udf/udf_i.h
+++ b/fs/udf/udf_i.h
@@ -1,6 +1,18 @@
#ifndef _UDF_I_H
#define _UDF_I_H
+/*
+ * The i_data_sem and i_mutex serve for protection of allocation information
+ * of a regular files and symlinks. This includes all extents belonging to
+ * the file/symlink, a fact whether data are in-inode or in external data
+ * blocks, preallocation, goal block information... When extents are read,
+ * i_mutex or i_data_sem must be held (for reading is enough in case of
+ * i_data_sem). When extents are changed, i_data_sem must be held for writing
+ * and also i_mutex must be held.
+ *
+ * For directories i_mutex is used for all the necessary protection.
+ */
+
struct udf_inode_info {
struct timespec i_crtime;
/* Physical address of inode */
@@ -21,6 +33,7 @@ struct udf_inode_info {
struct long_ad *i_lad;
__u8 *i_data;
} i_ext;
+ struct rw_semaphore i_data_sem;
struct inode vfs_inode;
};