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author | Alessio Igor Bogani <abogani@texware.it> | 2010-11-16 18:40:47 +0100 |
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committer | Jan Kara <jack@suse.cz> | 2011-01-06 17:03:56 +0100 |
commit | 4d0fb621d35007c19a396f2bb629e5aeaacef2d0 (patch) | |
tree | 92f6e0d3c38c15b0af507bd4b6d3353e34a337a9 /fs/udf/udf_i.h | |
parent | d1668fe390c1e84580575965684a8fa7e4626dee (diff) | |
download | linux-4d0fb621d35007c19a396f2bb629e5aeaacef2d0.tar.bz2 |
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.h | 13 |
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; }; |