diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/obdclass/linkea.c')
-rw-r--r-- | drivers/staging/lustre/lustre/obdclass/linkea.c | 75 |
1 files changed, 58 insertions, 17 deletions
diff --git a/drivers/staging/lustre/lustre/obdclass/linkea.c b/drivers/staging/lustre/lustre/obdclass/linkea.c index 0b1d2f0a422c..9af86d3d56e4 100644 --- a/drivers/staging/lustre/lustre/obdclass/linkea.c +++ b/drivers/staging/lustre/lustre/obdclass/linkea.c @@ -26,9 +26,9 @@ * Author: Di Wang <di.wang@intel.com> */ -#include "../include/lustre/lustre_idl.h" -#include "../include/obd.h" -#include "../include/lustre_linkea.h" +#include <uapi/linux/lustre/lustre_idl.h> +#include <obd.h> +#include <lustre_linkea.h> int linkea_data_new(struct linkea_data *ldata, struct lu_buf *buf) { @@ -39,6 +39,8 @@ int linkea_data_new(struct linkea_data *ldata, struct lu_buf *buf) ldata->ld_leh->leh_magic = LINK_EA_MAGIC; ldata->ld_leh->leh_len = sizeof(struct link_ea_header); ldata->ld_leh->leh_reccount = 0; + ldata->ld_leh->leh_overflow_time = 0; + ldata->ld_leh->leh_padding = 0; return 0; } EXPORT_SYMBOL(linkea_data_new); @@ -53,11 +55,15 @@ int linkea_init(struct linkea_data *ldata) leh->leh_magic = LINK_EA_MAGIC; leh->leh_reccount = __swab32(leh->leh_reccount); leh->leh_len = __swab64(leh->leh_len); - /* entries are swabbed by linkea_entry_unpack */ + leh->leh_overflow_time = __swab32(leh->leh_overflow_time); + leh->leh_padding = __swab32(leh->leh_padding); + /* individual entries are swabbed by linkea_entry_unpack() */ } + if (leh->leh_magic != LINK_EA_MAGIC) return -EINVAL; - if (leh->leh_reccount == 0) + + if (leh->leh_reccount == 0 && leh->leh_overflow_time == 0) return -ENODATA; ldata->ld_leh = leh; @@ -65,6 +71,18 @@ int linkea_init(struct linkea_data *ldata) } EXPORT_SYMBOL(linkea_init); +int linkea_init_with_rec(struct linkea_data *ldata) +{ + int rc; + + rc = linkea_init(ldata); + if (!rc && ldata->ld_leh->leh_reccount == 0) + rc = -ENODATA; + + return rc; +} +EXPORT_SYMBOL(linkea_init_with_rec); + /** * Pack a link_ea_entry. * All elements are stored as chars to avoid alignment issues. @@ -94,6 +112,8 @@ EXPORT_SYMBOL(linkea_entry_pack); void linkea_entry_unpack(const struct link_ea_entry *lee, int *reclen, struct lu_name *lname, struct lu_fid *pfid) { + LASSERT(lee); + *reclen = (lee->lee_reclen[0] << 8) | lee->lee_reclen[1]; memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid)); fid_be_to_cpu(pfid, pfid); @@ -110,25 +130,44 @@ EXPORT_SYMBOL(linkea_entry_unpack); int linkea_add_buf(struct linkea_data *ldata, const struct lu_name *lname, const struct lu_fid *pfid) { - LASSERT(ldata->ld_leh); + struct link_ea_header *leh = ldata->ld_leh; + int reclen; + + LASSERT(leh); if (!lname || !pfid) return -EINVAL; - ldata->ld_reclen = lname->ln_namelen + sizeof(struct link_ea_entry); - if (ldata->ld_leh->leh_len + ldata->ld_reclen > - ldata->ld_buf->lb_len) { + reclen = lname->ln_namelen + sizeof(struct link_ea_entry); + if (unlikely(leh->leh_len + reclen > MAX_LINKEA_SIZE)) { + /* + * Use 32-bits to save the overflow time, although it will + * shrink the ktime_get_real_seconds() returned 64-bits value + * to 32-bits value, it is still quite large and can be used + * for about 140 years. That is enough. + */ + leh->leh_overflow_time = ktime_get_real_seconds(); + if (unlikely(leh->leh_overflow_time == 0)) + leh->leh_overflow_time++; + + CDEBUG(D_INODE, "No enough space to hold linkea entry '" DFID ": %.*s' at %u\n", + PFID(pfid), lname->ln_namelen, + lname->ln_name, leh->leh_overflow_time); + return 0; + } + + if (leh->leh_len + reclen > ldata->ld_buf->lb_len) { if (lu_buf_check_and_grow(ldata->ld_buf, - ldata->ld_leh->leh_len + - ldata->ld_reclen) < 0) + leh->leh_len + reclen) < 0) return -ENOMEM; + + leh = ldata->ld_leh = ldata->ld_buf->lb_buf; } - ldata->ld_leh = ldata->ld_buf->lb_buf; - ldata->ld_lee = ldata->ld_buf->lb_buf + ldata->ld_leh->leh_len; + ldata->ld_lee = ldata->ld_buf->lb_buf + leh->leh_len; ldata->ld_reclen = linkea_entry_pack(ldata->ld_lee, lname, pfid); - ldata->ld_leh->leh_len += ldata->ld_reclen; - ldata->ld_leh->leh_reccount++; + leh->leh_len += ldata->ld_reclen; + leh->leh_reccount++; CDEBUG(D_INODE, "New link_ea name '" DFID ":%.*s' is added\n", PFID(pfid), lname->ln_namelen, lname->ln_name); return 0; @@ -139,6 +178,7 @@ EXPORT_SYMBOL(linkea_add_buf); void linkea_del_buf(struct linkea_data *ldata, const struct lu_name *lname) { LASSERT(ldata->ld_leh && ldata->ld_lee); + LASSERT(ldata->ld_leh->leh_reccount > 0); ldata->ld_leh->leh_reccount--; ldata->ld_leh->leh_len -= ldata->ld_reclen; @@ -174,8 +214,9 @@ int linkea_links_find(struct linkea_data *ldata, const struct lu_name *lname, LASSERT(ldata->ld_leh); - /* link #0 */ - ldata->ld_lee = (struct link_ea_entry *)(ldata->ld_leh + 1); + /* link #0, if leh_reccount == 0 we skip the loop and return -ENOENT */ + if (likely(ldata->ld_leh->leh_reccount > 0)) + ldata->ld_lee = (struct link_ea_entry *)(ldata->ld_leh + 1); for (count = 0; count < ldata->ld_leh->leh_reccount; count++) { linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen, |