diff options
Diffstat (limited to 'fs/xfs/linux-2.6/xfs_buf.h')
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_buf.h | 102 |
1 files changed, 51 insertions, 51 deletions
diff --git a/fs/xfs/linux-2.6/xfs_buf.h b/fs/xfs/linux-2.6/xfs_buf.h index 2a9749a3a762..814f9e83b516 100644 --- a/fs/xfs/linux-2.6/xfs_buf.h +++ b/fs/xfs/linux-2.6/xfs_buf.h @@ -44,57 +44,57 @@ typedef enum { XBRW_ZERO = 3, /* Zero target memory */ } xfs_buf_rw_t; -typedef enum { - XBF_READ = (1 << 0), /* buffer intended for reading from device */ - XBF_WRITE = (1 << 1), /* buffer intended for writing to device */ - XBF_MAPPED = (1 << 2), /* buffer mapped (b_addr valid) */ - XBF_ASYNC = (1 << 4), /* initiator will not wait for completion */ - XBF_DONE = (1 << 5), /* all pages in the buffer uptodate */ - XBF_DELWRI = (1 << 6), /* buffer has dirty pages */ - XBF_STALE = (1 << 7), /* buffer has been staled, do not find it */ - XBF_FS_MANAGED = (1 << 8), /* filesystem controls freeing memory */ - XBF_ORDERED = (1 << 11), /* use ordered writes */ - XBF_READ_AHEAD = (1 << 12), /* asynchronous read-ahead */ - XBF_LOG_BUFFER = (1 << 13), /* this is a buffer used for the log */ - - /* flags used only as arguments to access routines */ - XBF_LOCK = (1 << 14), /* lock requested */ - XBF_TRYLOCK = (1 << 15), /* lock requested, but do not wait */ - XBF_DONT_BLOCK = (1 << 16), /* do not block in current thread */ - - /* flags used only internally */ - _XBF_PAGE_CACHE = (1 << 17),/* backed by pagecache */ - _XBF_PAGES = (1 << 18), /* backed by refcounted pages */ - _XBF_RUN_QUEUES = (1 << 19),/* run block device task queue */ - _XBF_DELWRI_Q = (1 << 21), /* buffer on delwri queue */ - - /* - * Special flag for supporting metadata blocks smaller than a FSB. - * - * In this case we can have multiple xfs_buf_t on a single page and - * need to lock out concurrent xfs_buf_t readers as they only - * serialise access to the buffer. - * - * If the FSB size >= PAGE_CACHE_SIZE case, we have no serialisation - * between reads of the page. Hence we can have one thread read the - * page and modify it, but then race with another thread that thinks - * the page is not up-to-date and hence reads it again. - * - * The result is that the first modifcation to the page is lost. - * This sort of AGF/AGI reading race can happen when unlinking inodes - * that require truncation and results in the AGI unlinked list - * modifications being lost. - */ - _XBF_PAGE_LOCKED = (1 << 22), - - /* - * If we try a barrier write, but it fails we have to communicate - * this to the upper layers. Unfortunately b_error gets overwritten - * when the buffer is re-issued so we have to add another flag to - * keep this information. - */ - _XFS_BARRIER_FAILED = (1 << 23), -} xfs_buf_flags_t; +#define XBF_READ (1 << 0) /* buffer intended for reading from device */ +#define XBF_WRITE (1 << 1) /* buffer intended for writing to device */ +#define XBF_MAPPED (1 << 2) /* buffer mapped (b_addr valid) */ +#define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */ +#define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */ +#define XBF_DELWRI (1 << 6) /* buffer has dirty pages */ +#define XBF_STALE (1 << 7) /* buffer has been staled, do not find it */ +#define XBF_FS_MANAGED (1 << 8) /* filesystem controls freeing memory */ +#define XBF_ORDERED (1 << 11)/* use ordered writes */ +#define XBF_READ_AHEAD (1 << 12)/* asynchronous read-ahead */ +#define XBF_LOG_BUFFER (1 << 13)/* this is a buffer used for the log */ + +/* flags used only as arguments to access routines */ +#define XBF_LOCK (1 << 14)/* lock requested */ +#define XBF_TRYLOCK (1 << 15)/* lock requested, but do not wait */ +#define XBF_DONT_BLOCK (1 << 16)/* do not block in current thread */ + +/* flags used only internally */ +#define _XBF_PAGE_CACHE (1 << 17)/* backed by pagecache */ +#define _XBF_PAGES (1 << 18)/* backed by refcounted pages */ +#define _XBF_RUN_QUEUES (1 << 19)/* run block device task queue */ +#define _XBF_DELWRI_Q (1 << 21)/* buffer on delwri queue */ + +/* + * Special flag for supporting metadata blocks smaller than a FSB. + * + * In this case we can have multiple xfs_buf_t on a single page and + * need to lock out concurrent xfs_buf_t readers as they only + * serialise access to the buffer. + * + * If the FSB size >= PAGE_CACHE_SIZE case, we have no serialisation + * between reads of the page. Hence we can have one thread read the + * page and modify it, but then race with another thread that thinks + * the page is not up-to-date and hence reads it again. + * + * The result is that the first modifcation to the page is lost. + * This sort of AGF/AGI reading race can happen when unlinking inodes + * that require truncation and results in the AGI unlinked list + * modifications being lost. + */ +#define _XBF_PAGE_LOCKED (1 << 22) + +/* + * If we try a barrier write, but it fails we have to communicate + * this to the upper layers. Unfortunately b_error gets overwritten + * when the buffer is re-issued so we have to add another flag to + * keep this information. + */ +#define _XFS_BARRIER_FAILED (1 << 23) + +typedef unsigned int xfs_buf_flags_t; #define XFS_BUF_FLAGS \ { XBF_READ, "READ" }, \ |