diff options
Diffstat (limited to 'fs/fat/inode.c')
| -rw-r--r-- | fs/fat/inode.c | 59 |
1 files changed, 57 insertions, 2 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c index ab96ae823753..045738032a83 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -24,6 +24,7 @@ #include <linux/vfs.h> #include <linux/parser.h> #include <linux/uio.h> +#include <linux/writeback.h> #include <asm/unaligned.h> #ifndef CONFIG_FAT_DEFAULT_IOCHARSET @@ -853,7 +854,7 @@ enum { Opt_charset, Opt_shortname_lower, Opt_shortname_win95, Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes, Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes, - Opt_obsolate, Opt_err, + Opt_obsolate, Opt_flush, Opt_err, }; static match_table_t fat_tokens = { @@ -885,7 +886,8 @@ static match_table_t fat_tokens = { {Opt_obsolate, "cvf_format=%20s"}, {Opt_obsolate, "cvf_options=%100s"}, {Opt_obsolate, "posix"}, - {Opt_err, NULL} + {Opt_flush, "flush"}, + {Opt_err, NULL}, }; static match_table_t msdos_tokens = { {Opt_nodots, "nodots"}, @@ -1026,6 +1028,9 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug, return 0; opts->codepage = option; break; + case Opt_flush: + opts->flush = 1; + break; /* msdos specific */ case Opt_dots: @@ -1425,6 +1430,56 @@ out_fail: EXPORT_SYMBOL_GPL(fat_fill_super); +/* + * helper function for fat_flush_inodes. This writes both the inode + * and the file data blocks, waiting for in flight data blocks before + * the start of the call. It does not wait for any io started + * during the call + */ +static int writeback_inode(struct inode *inode) +{ + + int ret; + struct address_space *mapping = inode->i_mapping; + struct writeback_control wbc = { + .sync_mode = WB_SYNC_NONE, + .nr_to_write = 0, + }; + /* if we used WB_SYNC_ALL, sync_inode waits for the io for the + * inode to finish. So WB_SYNC_NONE is sent down to sync_inode + * and filemap_fdatawrite is used for the data blocks + */ + ret = sync_inode(inode, &wbc); + if (!ret) + ret = filemap_fdatawrite(mapping); + return ret; +} + +/* + * write data and metadata corresponding to i1 and i2. The io is + * started but we do not wait for any of it to finish. + * + * filemap_flush is used for the block device, so if there is a dirty + * page for a block already in flight, we will not wait and start the + * io over again + */ +int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2) +{ + int ret = 0; + if (!MSDOS_SB(sb)->options.flush) + return 0; + if (i1) + ret = writeback_inode(i1); + if (!ret && i2) + ret = writeback_inode(i2); + if (!ret && sb) { + struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; + ret = filemap_flush(mapping); + } + return ret; +} +EXPORT_SYMBOL_GPL(fat_flush_inodes); + static int __init init_fat_fs(void) { int err; |